Journal articles: 'Electro-optical communication'

1

Huck, Friedrich O. "Electro-optical design for efficient visual communication." Optical Engineering 34, no. 3 (March 1, 1995): 795. http://dx.doi.org/10.1117/12.194050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Chattopadhyay, T. "Electro-optic interferometers in wideband subcarrier-multiplexed optical communication." IEE Proceedings J Optoelectronics 138, no. 1 (1991): 60. http://dx.doi.org/10.1049/ip-j.1991.0010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Li, Jian, and Shuang Zhang. "Electro Optic Conversion Methods in Intra-Body Communication." Applied Mechanics and Materials 513-517 (February 2014): 4458–61. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.4458.

Full text

Abstract:

Galvanic coupling method has been observed to be the best method for data transmission in intra-body communication, which is proposed by Zimmerman in 1995. With the increasing transmission requirements and the development of optical fiber communication, a high speed data transmission system is required and it is possible to design an apparatus to realize the electro optic conversion. In this paper, the characteristics of the intra-body communication system are introduced. Principles and structures of the electro-optic modulation methods for intra-body communication are reviewed. Internal and external modulation methods are introduced and discussed. A system of the electro-optic and acousto-optic modulation are recommended for the intra-body communication system and discussed.

APA, Harvard, Vancouver, ISO, and other styles

4

Prabakaran, M. P., A. Sivasubramanian, and K. Chitra. "Performance Analysis of QAM with MEMS Based SCIR for Indoor Optical Wireless Communication." Applied Mechanics and Materials 592-594 (July 2014): 2189–92. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2189.

Full text

Abstract:

This paper presents the systematic evaluation of performance of indoor optical wireless communication using different modulation schemes and micro electro mechanical systems - single channel imaging receiver (MEMS-SCIR). For the future modern world, indoor optical wireless communications (OWC) play a vital role. The main objective is to compare the performance of various modulation schemes in terms of their bit error probability. On -off keying (OOK) and pulse position modulation (PPM) are widely used in optical wireless communication for its simplicity. Here different digital modulation schemes are approached; bit error rate (BER) is calculated over additive white Gaussian noise channel (AWGN). M-quadrature amplitude modulation (MQAM) gives a better BER performance compared to the M- phase shift keying (MPSK). Thus, MQAM based MEMS-SCIR provides better performance in indoor optical wireless communications.

APA, Harvard, Vancouver, ISO, and other styles

5

Ma, Li Xiang, and Zheng Li. "An Intelligent Bullet Counter Based on UV Electro-Optical Technology." Advanced Materials Research 591-593 (November 2012): 1669–72. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1669.

Full text

Abstract:

Intelligent management of bullets at shooting ranges suffers from the limitations of manual bullet counting. Based on UV electro-optical technology, we have built a bullet counter and participated in field experiments. The bullet counter is composed of two modules, UV electro-optical module and data processing and communication module. In UV electro-optical module, a ‘solar blind’ UV detector is used to detect UV radiation of bullet flames. The embedded preamplifier of UV detector and the low-pass filter increase the signal-to-noise ratio of the system greatly. In data processing and communication module, analog signal, containing bullet impulses, is converted to digital signal and counted by a timer. The results of bullet counting can be read by USB. All these functions are implemented by STM32 (STM32F103CBT6), a microcontroller based on Cortex-M3. The bullet counter has been put into use at several shooting ranges and worked well.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Jian, Shuang Zhang, and Yi He Liu. "Electro Optic Methods in Intra-Body Communication System." Applied Mechanics and Materials 380-384 (August 2013): 3517–21. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3517.

Full text

Abstract:

Intra-body communication is proposed by Zimmerman in 1995 and the galvanic coupling has been observed to be the best method for data transmission. With the increasing transmission requirements and the development of optical fiber communication, a high speed system is possible to be designed based on the Electro optic methods. In this paper, the characteristics of the intra-body communication system are introduced. Principles and structures of optic modulation for intra-body communication are reviewed. Internal and external modulation methods are introduced and discussed. A system of the electro optic modulation is recommended and discussed.

APA, Harvard, Vancouver, ISO, and other styles

7

YANG, XIAOTUN, KAZUKI ABE, RYUJI KATO, SHINICHI YANO, TAKASHI KATO, KAZUTOSHI MIYAZAWA, and HIROYUKI TAKEUCHI. "Preliminary communication Electro-optical properties of benzyl fluoroalkyl ether derivatives." Liquid Crystals 25, no. 5 (November 1998): 639–41. http://dx.doi.org/10.1080/026782998205930.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Hu, Hao, and Leif K. Oxenløwe. "Chip-based optical frequency combs for high-capacity optical communications." Nanophotonics 10, no. 5 (February 3, 2021): 1367–85. http://dx.doi.org/10.1515/nanoph-2020-0561.

Full text

Abstract:

AbstractCurrent fibre optic communication systems owe their high-capacity abilities to the wavelength-division multiplexing (WDM) technique, which combines data channels running on different wavelengths, and most often requires many individual lasers. Optical frequency combs, with equally spaced coherent comb lines derived from a single source, have recently emerged as a potential substitute for parallel lasers in WDM systems. Benefits include the stable spacing and broadband phase coherence of the comb lines, enabling improved spectral efficiency of transmission systems, as well as potential energy savings in the WDM transmitters. In this paper, we discuss the requirements to a frequency comb for use in a high-capacity optical communication system in terms of optical linewidth, per comb line power and optical carrier-to-noise ratio, and look at the scaling of a comb source for ultra-high capacity systems. Then, we review the latest advances of various chip-based optical frequency comb generation schemes and their applications in optical communications, including mode-locked laser combs, spectral broadening of frequency combs, microresonator-based Kerr frequency combs and electro-optic frequency combs.

APA, Harvard, Vancouver, ISO, and other styles

9

Li, Wen Cui, Shi Wen Wang, Xiong Li, and Fang Yuang. "The Study of a Novel Optical Communication Device." Applied Mechanics and Materials 556-562 (May 2014): 4911–15. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4911.

Full text

Abstract:

A novel optical communication device is investigated in this paper. The device is a kind of optical switch. The intensity of emergent light is tunable continuously by introducing liquid crystal technique. Holographic technique is used to fabricate this optical device. According to optical theories and through many experiments, the ideal optical switching device can be obtained when the photosensitive monomers are mixed together with liquid crystal with certain weight ratio. The emergent light intensity of liquid crystal grating can be modulated by electric field because of the electric control characteristics of liquid crystal. The output light is only 5% of the incident light when the electric field is more than 15V. Besides, the liquid crystal also has the advantages of large electro-optic coefficient, fast response speed and so on. Consequently, the liquid crystal grating has immense potential productivity in passive optical communication device such as optical switching and variable optical attenuator.

APA, Harvard, Vancouver, ISO, and other styles

10

Raghunathababu and Siddaiah P. "ELECTRO OPTIC MODULATOR DEVICES FOR HIGH SPEED DATA IN OPTICAL COMMUNICATION." International Journal of Research -GRANTHAALAYAH 3, no. 10 (October 31, 2015): 38–42. http://dx.doi.org/10.29121/granthaalayah.v3.i10.2015.2930.

Full text

Abstract:

Electro Optic devices in fiber optic Communication systems are playing a Vital Role in telecommunication infrastructure for worldwide broadband networks. Wide bandwidth of signal transmission with low delay, wide transmission bandwidth with less latency, the transmission medium for long distance with high data rate transmission. This paper gives an overview of Electro optic devices for fiber optic systems and their key technologies, their technological trend towards the next generation.

APA, Harvard, Vancouver, ISO, and other styles

11

Zhan, Wei Da, Dong Ya Xiao, Zi Qiang Hao, and Hong Zuo Li. "Research on Near Space Optical Communication Transmitting and Receiving Technology." Applied Mechanics and Materials 721 (December 2014): 678–81. http://dx.doi.org/10.4028/www.scientific.net/amm.721.678.

Full text

Abstract:

In near space optical communication, the laser beam energy affects communication link distance directly, also laser beam quality affects the laser energy density, modulation efficiency, bit error rate (BER) of communication and other parameters. In this paper we have presented an experiment system of space optical communication, of which the transmitting power is 1w, modulation rate is 500 Mbps and link distance is 8 to 10 kilometers. Then the effects of optical fiber collimator, electro-optic modulator, optical antenna and other units on beam power loss, beam diameter, divergence angle and other parameters are analyzed. Last we put forward the way of increasing the laser transmitting distance and the optimization measure of system key unit.

APA, Harvard, Vancouver, ISO, and other styles

12

Hui, Hunag Chun. "Study of Quantum Communication System with Coherent Light." Applied Mechanics and Materials 145 (December 2011): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amm.145.104.

Full text

Abstract:

In this paper， we introduced a system of coherent optical detection with homodyne， which implementing coherent optical communication，our own design based on the principle of coherent optical communication. IN the system, PCI6111E was useed as a data acquisition(DAQ) module. Alice and Bob’s control procedure by their computers under the LabVIEW. The synchronous detection and DAQ were carried out on the system. The signals were processed, displayed and measured. The Experimental results show that by light-synchronization and LabVIEW procedure control, each function module work together in cooperation, include Alice’s acousto-optic modulator and electro-optical modulator, Bob’s data acquisition and phase adjustment by PZT. The coherent optical information could be transitted by Alice and real-time demodulated by Bob.

APA, Harvard, Vancouver, ISO, and other styles

13

Tseng, Shin-Pin, Eddy Wijanto, Po-Han Lai, and Hsu-Chih Cheng. "Bipolar Optical Code Division Multiple Access Techniques Using a Dual Electro-Optical Modulator Implemented in Free-Space Optics Communications." Sensors 20, no. 12 (June 24, 2020): 3583. http://dx.doi.org/10.3390/s20123583.

Full text

Abstract:

This study developed a bipolar optical code division multiple access (Bi-OCDMA) technique based on spectral amplitude coding for the formation and transmission of optical-polarized and coded signals over wireless optical channels. Compared with conventional Bi-OCDMA schemes, the proposed free-space optics communication system that uses a dual electro-optical modulator design improves the transmission rate. In theory, multiple access interference can be removed by using correlation subtraction schemes. The experiment results revealed that the proposed system can be employed to accurately extract codewords from an M-sequence and subsequently reconstruct the desired original data. Moreover, the proposed architecture can be implemented easily in simple and cost-effective designs and may be beneficial for broadening the use of Bi-OCDMA schemes in wireless optical communications.

APA, Harvard, Vancouver, ISO, and other styles

14

Jiang, Ziqi, Shuqiang Chen, and Yuanyuan Xue. "Homodyne coherent optical communication system based on reflex electro-optic modulator." Optical Engineering 58, no. 01 (January 8, 2019): 1. http://dx.doi.org/10.1117/1.oe.58.1.016103.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Ren, Zhibin, Yahui Sun, Jiasheng Hu, Shuqing Zhang, Zihao Lin, and Xiyang Zhi. "Electro‐optic filter based on guided‐mode resonance for optical communication." Electronics Letters 54, no. 23 (November 2018): 1340–42. http://dx.doi.org/10.1049/el.2018.5034.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Kubo, Wataru, Tadashi Minakuchi, Koichi Sato, Koichi Tsutamura, Takaaki Shoji, Kazuo Sugitani, Akira Arimoto, and Shinichi Arai. "Electro Magnetic Compatibility Noise Free Endoscope Using Optical Fiber Communication Technology." Japanese Journal of Applied Physics 47, no. 8 (August 22, 2008): 6819–25. http://dx.doi.org/10.1143/jjap.47.6819.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Abushagur, M. A. G., and A. Helaly. "Acousto-electro-optic demultiplexers in high data-rate optical communication systems." Optics & Laser Technology 28, no. 6 (September 1996): 457–61. http://dx.doi.org/10.1016/0030-3992(95)00076-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Guo, Zi Peng, Chao Ming Xie, and Yong Jun Xiao. "Research of Sliding Mode Control in Electro-Optical Tracking System." Advanced Materials Research 756-759 (September 2013): 403–6. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.403.

Full text

Abstract:

as the foundation and critical part of the free Space optical communication, the electro-optical tracking system is a typical nonlinear system. However, the angular accuracy should be better than a few micro-radians to meet the requirement of the communication link construction between two terminals. To get more control precision, the mathematic model of the coarse pointing system is founded, and sliding mode variable structure controller with approach law is designed. Finally, the simulation is done separately for a typical PID controller and the variable structure controller. Simulation results are showed that the sliding mode control can finely control the attitude of coarse pointing system, and can get higher precision by contrasted to the conventional PID controller.

APA, Harvard, Vancouver, ISO, and other styles

19

Przystupa, Krzysztof, Mykola Beshley, Mykola Kaidan, Volodymyr Andrushchak, Ivan Demydov, Orest Kochan, and Daniel Pieniak. "Methodology and Software Tool for Energy Consumption Evaluation and Optimization in Multilayer Transport Optical Networks." Energies 13, no. 23 (December 2, 2020): 6370. http://dx.doi.org/10.3390/en13236370.

Full text

Abstract:

In communication networks, the volume of traffic, the number of connected devices and users continues to grow. As a result, the energy consumption generated by the communication infrastructure has become an important parameter that needs to be carefully considered and optimized both when designing the network and when operating it in real-time. In this paper, the methodology of calculation of complex parameters of energy consumption for transport telecommunication networks is proposed. Unlike the known techniques, the proposed methodology takes into account heterogeneity and multilayer networks. It also takes into account the energy consumption parameter during the downtime of the network equipment in the process of processing the service data blocks, which is quite an important task for improving the accuracy of energy consumption at the stage of implementing the energy-saving network. We also developed simulation software to estimate and manage the energy consumption of the optical transport network using the LabVIEW environment. This software tool allows telecommunication network designers to evaluate energy consumption, which allows them to choose the optimal solution for the desired projects. The use of electro-and acousto-optical devices for optical transport networks is analyzed. We recommended using electro-optical devices for optical modulators and acousto-optical devices for optical switches. The gain from using this combination of optical devices and the parameter of rij electro-optical coefficient and M2 acousto-optical quality parameter found in the paper is about 36.1% relative to the complex criterion of energy consumption.

APA, Harvard, Vancouver, ISO, and other styles

20

En, De, Chang Sheng Zhou, Huang He Wei, Na Na Wei, and Xiao Long Shi. "Research of MOEMS Pressure Sensor." Applied Mechanics and Materials 273 (January 2013): 524–27. http://dx.doi.org/10.4028/www.scientific.net/amm.273.524.

Full text

Abstract:

In recent years, with the development of optical communication by leaps and bounds, promote the Micro-opto-electro-mechanical system (MOEMS) development. As a new technology, the MOEMS have been widely used in optical communication, optical switching, data storage, optical sensing and etc.. Compared with the traditional pressure sensors, the optical pressure sensor based on MOEMS has some unique advantages. In this paper, the structures, operation principles and fabrication processes of various MOEMS pressure sensors are described mainly. Finally, the structure and Key technology of a MOEMS pressure sensor array is presented in brief.

APA, Harvard, Vancouver, ISO, and other styles

21

Sorger, Volker J., Norberto D. Lanzillotti-Kimura, Ren-Min Ma, and Xiang Zhang. "Ultra-compact silicon nanophotonic modulator with broadband response." Nanophotonics 1, no. 1 (July 1, 2012): 17–22. http://dx.doi.org/10.1515/nanoph-2012-0009.

Full text

Abstract:

AbstractElectro-optic modulators have been identified as the key drivers for optical communication and signal processing. With an ongoing miniaturization of photonic circuitries, an outstanding aim is to demonstrate an on-chip, ultra-compact, electro-optic modulator without sacrificing bandwidth and modulation strength. While silicon-based electro-optic modulators have been demonstrated, they require large device footprints of the order of millimeters as a result of weak non-linear electro-optical properties. The modulation strength can be increased by deploying a high-Q resonator, however with the trade-off of significantly sacrificing bandwidth. Furthermore, design challenges and temperature tuning limit the deployment of such resonance-based modulators. Recently, novel materials like graphene have been investigated for electro-optic modulation applications with a 0.1 dB per micrometer modulation strength, while showing an improvement over pure silicon devices, this design still requires device lengths of tens of micrometers due to the inefficient overlap between the thin graphene layer, and the optical mode of the silicon waveguide. Here we experimentally demonstrate an ultra-compact, silicon-based, electro-optic modulator with a record-high 1 dB per micrometer extinction ratio over a wide bandwidth range of 1 μm in ambient conditions. The device is based on a plasmonic metal-oxide-semiconductor (MOS) waveguide, which efficiently concentrates the optical modes’ electric field into a nanometer thin region comprised of an absorption coefficient-tuneable indium-tin-oxide (ITO) layer. The modulation mechanism originates from electrically changing the free carrier concentration of the ITO layer which dramatically increases the loss of this MOS mode. The seamless integration of such a strong optical beam modulation into an existing silicon-on-insulator platform bears significant potential towards broadband, compact and efficient communication links and circuits.

APA, Harvard, Vancouver, ISO, and other styles

22

Lee, Eun-Su, Sung-Moon Kim, Mi-Hye Yi, Jae-Won Ka, and Min-Cheol Oh. "Coplanar Electrode Polymer Modulators Incorporating Fluorinated Polyimide Backbone Electro-Optic Polymer." Photonics 7, no. 4 (October 30, 2020): 100. http://dx.doi.org/10.3390/photonics7040100.

Full text

Abstract:

High-speed coherent optical communication has been expanding to handle the ever-increasing data traffic, and the large modulation bandwidth of electro-optic (EO) polymer modulators has been especially appreciated. However, to be useful in optical communication, the EO polymer device should address several issues, such as thermal stability, photo-oxidation, and bias drift. In this work, as a part of the experiments to address these challenges, an EO polymer with a fluorinated polyimide backbone is utilized to create EO polymer modulators with improved thermal stability. A coplanar electrode structure is introduced to enhance the poling efficiency and reduce the bias drift.

APA, Harvard, Vancouver, ISO, and other styles

23

Shinagawa, Mitsuru, Ai-ichiro Sasaki, Akinori Furuya, Hiroki Morimura, and Kimihisa Aihara. "Compact Electro-Optic Sensor Module for Intra-Body Communication Using Optical Pickup Technology." Japanese Journal of Applied Physics 52, no. 9S2 (September 1, 2013): 09LA03. http://dx.doi.org/10.7567/jjap.52.09la03.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Hbeeb, Sadeq. "Estimation of analytical model for enhancement and implementation of an electro-optic switch." Iraqi Journal for Electrical and Electronic Engineering 13, no. 2 (December 1, 2017): 166–72. http://dx.doi.org/10.37917/ijeee.13.2.3.

Full text

Abstract:

This research presents a technique of an electro optic effect for enhancement the an accomplishment of an electro optics switch using Mat lab simulation program . this technique includes design a mathematical model for evaluate the effect of different parameters such as refractive index (n), distance of separation between waveguides (d), length of electrodes (L), relative refractive index (Δn), and switching voltage (V), on the DC bias voltage of an electro optics switch. In this work the investigation of performance of an electro optics switch by analysis of an effect of distance between waveguides and the changing of refractive index on the bias voltage (V), and which optimizes when the wavelength is from 1300 into 1550 nm. Finally, an electro-optic active switch is designed and optimized, using the analytical model and which considers important device in the modern optical communication system.

APA, Harvard, Vancouver, ISO, and other styles

25

Hammadi, Ali, Ali Al-Askery, and Entidhar Zghair. "Quality Factor and SNR Compensation of Free Space Optical Communication Link Using Different Modulators." International Journal of Engineering & Technology 7, no. 4 (November 30, 2018): 3747. http://dx.doi.org/10.14419/ijet.v7i4.19109.

Full text

Abstract:

Free space optical (FSO) systems introduce the best solution for the broadband network requirements with a cost reduction compared to the optical wire communication systems. This paper studies the signal to noise ratio (SNR) and quality factor (Q-factor) for using two types of modulation formats and compares their performance. The analysis are performed for Mach-Zehnder modulator (MZM) and electro-absorption modulator (EAM) with distance range (1-4) km of FSO by using avalanche photo-diodes (APD) receivers. The simulation results are obtained based on the Optisystem 7.0 with optical high data rate of 10 Gbs for this communication system. The simulation results have shown that MZM gives better performance compared to EAM for different ranges and for the selected beam divergence value.

APA, Harvard, Vancouver, ISO, and other styles

26

MASCHKE, ULRICH, NICOLAS GOGIBUS, ANDRE TRAISNEL, and XAVIER COQUERET. "Preliminary communication Electron beam cured liquid crystal-polymer composite materials: electro-optical enhancement effect." Liquid Crystals 23, no. 3 (September 1997): 457–61. http://dx.doi.org/10.1080/026782997208398.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Amin, Rubab, Can Suer, Zhizhen Ma, Ibrahim Sarpkaya, Jacob B. Khurgin, Ritesh Agarwal, and Volker J. Sorger. "Active material, optical mode and cavity impact on nanoscale electro-optic modulation performance." Nanophotonics 7, no. 2 (October 25, 2017): 455–72. http://dx.doi.org/10.1515/nanoph-2017-0072.

Full text

Abstract:

AbstractElectro-optic modulation is a key function in optical data communication and possible future optical compute engines. The performance of modulators intricately depends on the interaction between the actively modulated material and the propagating waveguide mode. While a variety of high-performance modulators have been demonstrated, no comprehensive picture of what factors are most responsible for high performance has emerged so far. Here we report the first systematic and comprehensive analytical and computational investigation for high-performance compact on-chip electro-optic modulators by considering emerging active materials, model considerations and cavity feedback at the nanoscale. We discover that the delicate interplay between the material characteristics and the optical mode properties plays a key role in defining the modulator performance. Based on physical tradeoffs between index modulation, loss, optical confinement factors and slow-light effects, we find that there exist combinations of bias, material and optical mode that yield efficient phase or amplitude modulation with acceptable insertion loss. Furthermore, we show how material properties in the epsilon near zero regime enable reduction of length by as much as by 15 times. Lastly, we introduce and apply a cavity-based electro-optic modulator figure of merit, Δλ/Δα, relating obtainable resonance tuning via phase shifting relative to the incurred losses due to the fundamental Kramers-Kronig relations suggesting optimized device operating regions with optimized modulation-to-loss tradeoffs. This work paves the way for a holistic design rule of electro-optic modulators for high-density on-chip integration.

APA, Harvard, Vancouver, ISO, and other styles

28

Hakobyan, Nune H., Hakob L. Margaryan, Valeri K. Abrahamyan, Vladimir M. Aroutiounian, Arpi S. Dilanchian Gharghani, Amalya B. Kostanyan, Timothy D. Wilkinson, and Nelson Tabirian. "Electro-optical characteristics of a liquid crystal cell with graphene electrodes." Beilstein Journal of Nanotechnology 8 (December 28, 2017): 2802–6. http://dx.doi.org/10.3762/bjnano.8.279.

Full text

Abstract:

In liquid crystal devices (LCDs) the indium tin oxide (ITO) films are traditionally used as transparent and conductive electrodes. However, today, due to the development of multichannel optical communication, the need for flexible LCDs and multilayer structures has grown. For this application ITO films cannot be used in principle. For this problem, graphene (an ultrathin material with unique properties, e.g., high optical transparency, chemical inertness, excellent conductivity) is an excellent candidate. In this work, the electro-optical and dynamic characteristics of a liquid crystal (LC) cell with graphene and ITO transparent conducting layers are investigated. To insure uniform thickness of the LC layer, as well as the same orientation boundary conditions, a hybrid LC cell containing graphene and ITO conductive layers has been prepared. The characteristics of LC cells with both types of conducting layers were found to be similar, indicating that graphene can be successfully used as a transparent conductive layer in LC devices.

APA, Harvard, Vancouver, ISO, and other styles

29

Huang, Can, Dongni Li, Tiancheng He, Yedong Peng, Wei Zhou, Zhihong Yang, Jianmei Xu, and Qing Wang. "Large Quadratic Electro-Optic Effect of the PLZT Thin Films for Optical Communication Integrated Devices." ACS Photonics 7, no. 11 (October 28, 2020): 3166–76. http://dx.doi.org/10.1021/acsphotonics.0c01234.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Li, Xin, Xu Wang, Yun Li, Feifei Qin, Yan Jiang, Linning Wang, and Yongjin Wang. "AlInGaAs MQW Transceiver with Electro-optic Modulation Characteristics for Free-Space Optical Communication and Sensing." ACS Omega 6, no. 36 (September 3, 2021): 23614–20. http://dx.doi.org/10.1021/acsomega.1c03865.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Coffa, Salvatore, and Leonid Tsybeskov. "Silicon-Based Optoelectronics." MRS Bulletin 23, no. 4 (April 1998): 16–19. http://dx.doi.org/10.1557/s0883769400030219.

Full text

Abstract:

The enormous progress of communication technologies in the last years has increased the demand for efficient and low-cost optoelectronic functions. For several present and future applications, photonic materials—in which light can be generated, guided, modulated, amplified, and detected—need to be integrated with standard electronic circuits in order to combine the information-processing capabilities of electronics data transfer and the speed of light. Long-distance communications, local-area-networks data transfer, and chip-to-chip or even intrachip optical communications all require the development of efficient optical functions and their integration with state-of-the-art electronic functions. Silicon is the material of choice for reliable and low-cost optoelectronic integrated circuits because it is the leading semiconductor in the electronic arena and since a wellestablished processing technology exists for this material. However Si is characterized by an indirect bandgap and by a weak electro-optic effect. It is therefore not suitable for the implementation of fundamental optical functions such as light emission and modulation. At the moment, hybrid integration of compound-semiconductor optical functions with Si electronic functions is providing the gateway from electronic to photonic technology. However several strategies are being considered to engineer the optical functions of Si and to realize fully Si-based or at least Si-compatible optoelectronics.

APA, Harvard, Vancouver, ISO, and other styles

32

Liu, Hong, and Wei Da Zhan. "Research on High-Power, High-Speed Laser Modulation and Enlarge Experiment." Applied Mechanics and Materials 721 (December 2014): 579–82. http://dx.doi.org/10.4028/www.scientific.net/amm.721.579.

Full text

Abstract:

A laser modulation and amplification system is designed to meet the demand of long-range space optical communication, which uses the high-speed semiconductor laser to integrate electro-absorption (EA) modulator as a seed source. Two optical fiber amplifier technologies are used. The erbium-doped fiber amplifier (EDFA) and single-mode semiconductor laser pumping are used in the first-level; erbium ytterbium co-doped fiber amplifier (EYDFA) and 2-4 multimode fiber laser pumping with good temperature characteristics are used in the second level, and the control method is automatic gain control. The experimental result shows that the modulation rate achieves to 10Gbps, and the output optical power achieves to 5W.

APA, Harvard, Vancouver, ISO, and other styles

33

Pai, Kai-Jun, Chang-Hua Lin, and Po-Hsun Chen. "Employing a Laser Headlight Electrical System to Measure and Calculate Electro-Optic Conversion Efficiencies of Blue-Beam Laser Diodes." Electronics 9, no. 11 (November 12, 2020): 1902. http://dx.doi.org/10.3390/electronics9111902.

Full text

Abstract:

In this study, a laser headlight electrical system was developed and implemented to measure and compare the electro-optic characteristics of the blue-beam laser diodes (BBLDs). To observe different temperatures (from negative to positive temperatures) that cause optical output power (OOP) and electrical power variations of the BBLDs, BBLDs were placed in an ambient temperature testing chamber, and the electro-optic characteristics of the BBLDs were measured to estimate the electro-optic conversion efficiencies. The different OOPs and electro-optic conversion efficiencies at different temperatures can be obtained when OOP adjustment was performed by average current and low-frequency pulse-duty cycle modulation technologies. Moreover, this study developed a human–machine interface using the LabVIEW software; therefore, the laser headlight electrical system can be controlled and monitored by a computer with the controller area network (CAN) bus communication. Finally, the prototype of the laser headlight electrical system was achieved, and three BBLDs were driven; furthermore, the white light of the headlight can be produced by mixing blue laser beams with a yellow fluorescence ceramic wafer.

APA, Harvard, Vancouver, ISO, and other styles

34

Kaur, Gurjit, Neha Rani, Yaman Parasher, and Prabhjot Singh. "Design and Implementation of Electro-Optic 2×2 Switch and Optical Gates using MZI." Journal of Optical Communications 41, no. 3 (April 28, 2020): 269–77. http://dx.doi.org/10.1515/joc-2017-0198.

Full text

Abstract:

AbstractMZI switches are well-known devices for high speed communication applications. A lot of researchers have designed MZI switches by using lithium niobate and potassium niobate material. But the major problem of using these type of material includes high insertion losses and required high switching voltage. So, in this research paper we have designed a 2×2 electro-optic switch using optical waveguide designed with Titanium (Ti) diffused in Strontium barium niobate (SBNO3) material which can operate at wavelength of 1.3 um. Results show that the proposed structure gives better output in terms of extinction ratio (=29.9 db) as well as for insertion losses (≤0.018). Further, we have designed various optical gates i. e. XNOR, XOR and AND optical gates and their performance is also evaluated by varying electrode voltages. It is inferred from the results that the proposed model gives better results even in terms of output power which can be used for commercial purpose.

APA, Harvard, Vancouver, ISO, and other styles

35

M. A. Eid, Mahmoud, Ashraf S. Seliem, Ahmed Nabih Zaki Rashed, Abd El-Naser A. Mohammed, Mohamed Yassin Ali, and Shaimaa S. Abaza. "High speed pulse generators with electro-optic modulators based on different bit sequence for the digital fiber optic communication links." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 2 (February 1, 2021): 957. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp957-967.

Full text

Abstract:

The paper outlines the simulation of various pulse generators for the enhancement of optical fiber access transmission networks within flow rate of 10 Gbps and transmission range of 100 km. The pulse generators are gaussian, hyperbolic secant, triangle, sine, raised cosine in the transmission stage. Proposed pulse generators are mixed with both electro-absorption modulator (EAM) and mach-zehnder modulator (MZM) for efficient transmission. We have compared the max. the quality factor with using proposed pulse generators against nonreturn to zero (NRZ) return to zero (RZ) pulse generators in the previous research works for different bit sequences. The signal power amplitude is tested for both optical fiber and PIN photodetector optical time-domain visualizer and RF spectrum analyzer by using in the optimum cases for different bit sequence. It is observed that proposed pulse generators/EAM have presented an efficient increase in Q-factor value compared with proposed pulse generators/MZM for different bit sequences.

APA, Harvard, Vancouver, ISO, and other styles

36

Tokas, Konstantinos, Giannis Patronas, Christos Spatharakis, Paraskevas Bakopoulos, Angelos Kyriakos, Giada Landi, Eitan Zahavi, et al. "End-to-End Real-Time Demonstration of the Slotted, SDN-Controlled NEPHELE Optical Datacenter Network." Photonics 7, no. 2 (June 25, 2020): 44. http://dx.doi.org/10.3390/photonics7020044.

Full text

Abstract:

The NEPHELE hybrid electro-optical datacenter network (DCN) architecture is proposed as a dynamic network solution to provide high capacity, scalability, and cost efficiency in comparison to the existing DCN infrastructures. The details of the NEPHELE DCN architecture and its various key parts are introduced, and the performance of its implementation is evaluated through an end-to-end NEPHELE demonstrator, which was built at the National Technical University of Athens. Several communication scenarios are demonstrated in real time, exploiting a scalable optical data-plane architecture with a software-defined network (SDN) control plane capable of slotted operation for dynamic allocation of network resources. Real-time end-to-end functionality and integration of various software and hardware components are verified in a six-host prototype datacenter cluster.

APA, Harvard, Vancouver, ISO, and other styles

37

Zaki Rashed, Ahmed Nabih. "Optimization Design Parameters of Electro-optic Modulators for Low Loss Wide Bandwidth Capability of Optical Communication Systems." International Journal of Computer Network and Information Security 4, no. 5 (June 1, 2012): 46–55. http://dx.doi.org/10.5815/ijcnis.2012.05.06.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Song, Yong, Kai Zhang, Qun Hao, and Jannick P. Rolland. "Modeling and characterization of the electrostatic coupling intra-body communication based on Mach-Zehnder electro-optical modulation." Optics Express 20, no. 12 (May 31, 2012): 13488. http://dx.doi.org/10.1364/oe.20.013488.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Pal, Amrindra, Santosh Kumar, and Sandeep Sharma. "Design of optical decoder circuits using electro-optic effect inside Mach–Zehnder interferometers for high speed communication." Photonic Network Communications 35, no. 1 (June 7, 2017): 79–89. http://dx.doi.org/10.1007/s11107-017-0718-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Sun, Zhanshan, Yuejun Zheng, and Yunqi Fu. "Graphene-Based Spatial Light Modulator Using Metal Hot Spots." Materials 12, no. 19 (September 21, 2019): 3082. http://dx.doi.org/10.3390/ma12193082.

Full text

Abstract:

Here, we report a graphene-based electric field enhancement structure achieved by several adjacent metal nanoribbons which form the hot spots of the electric field and thus promote the absorption of the single layered graphene below the hot spots. Based on the tunability of the graphene’s Fermi level, the absorption rate can be modulated from near 100% to 35% under low electrostatic gating, leading to a 20 dB modulation depth of reflectance. Compared with the existing near infrared spatial light modulators such as optical cavities integrated with graphene and other structures utilizing patterned or highly doped graphene, our design has the advantages of strong optical field enhancement, low power dissipation and high modulation depth. The proposed electro-optic modulator has a promising potential for developing optical communication and exploiting big data interaction systems.

APA, Harvard, Vancouver, ISO, and other styles

41

Abood, Israa, Sayed Elshahat, and Zhengbiao Ouyang. "High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid." Nanomaterials 10, no. 9 (September 3, 2020): 1742. http://dx.doi.org/10.3390/nano10091742.

Full text

Abstract:

Slow light with adequate low group velocity and wide bandwidth with a flat band of the zero-dispersion area were investigated. High buffering capabilities were obtained in a silicon-polymer coupled-slot slab photonic crystal waveguide (SP-CS-SPCW) with infiltrating slots by ionic liquid. A figure of merit (FoM) around 0.663 with the lowest physical bit length Lbit of 4.6748 µm for each stored bit in the optical communication waveband was gained by appropriately modifying the square air slot length. Posteriorly, by filling the slots with ionic liquid, the Lbit was enhanced to be 4.2817 μm with the highest FoM of 0.72402 in wider transmission bandwidth and ultra-high bit rate in terabit range, which may become useful for the future 6G mobile communication network. Ionic liquids have had a noticeable effect in altering the optical properties of photonic crystals. A polymer was used for the future incorporation of an electro-optic effect in buffers to realize the dynamic controlling of optical properties. Ionic liquids enhanced the transmission rate through optical materials. Additionally, the delay time in the ns-range was achieved, providing longer delay and ultra-low group velocity, which is important for light-matter interaction in light amplifiers and nonlinear devices.

APA, Harvard, Vancouver, ISO, and other styles

42

Furuya, Akinori, Ai-ichiro Sasaki, Hiroki Morimura, Kimihisa Aihara, and Mitsuru Shinagawa. "Electro-Optical Sensor Fabricated Using a Bulk Cleavage Technique and Its Characteristics for Near-Field Intra-Body Communication." Japanese Journal of Applied Physics 52, no. 9S2 (September 1, 2013): 09LA04. http://dx.doi.org/10.7567/jjap.52.09la04.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Varughese, George, Sreeja R. Aswathy, K. T. Usha, and A. S. Kumar. "Optical Band Gap of Wurtzite Zinc Sulphide Doped with Lanthanum Ions." Advanced Materials Research 622-623 (December 2012): 752–56. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.752.

Full text

Abstract:

Pure and doped Zinc Sulfide (ZnS) quantum dots have attracted increasing interest from researchers working on various scientific and engineering applications in electronics, nonlinear optical devices for communication, and optical computers. In this study, ZnS nanoparticles doped with lanthanum (ZnS:La) with approximately 11 nm size was produced at 150°C by chemical precipitation route. Zinc Sulphide is an extensively studied group II-VI semiconductor with wide application in field of Photo Luminescence (PL),Electro Luminescence(EL) and Cathodo Luminescence (CL). It is an excellent light transmission material with high refractive index 2.27. XRD, SEM, FTIR UV-Vis and EDS characterize the samples.In this study, the UV–Visible absorption spectra of ZnS:La showed a red shift in the absorption shoulder compared with the spectra of undoped samples. ZnS nanoparticles could be doped with lanthanum ions during synthesis without altering the X-ray diffraction (XRD) patterns of ZnS. Also, the XRD pattern of the powders showed cubic crystal structures for ZnS:La. The Optical band gap has been found to be 2.7 eV. It was found that energy Band gap Eg decreases with doping of La.

APA, Harvard, Vancouver, ISO, and other styles

44

Ali, Mohanad H., Mahmood H. Enad, Jasim Mohmed Jasim, Rawaa A. Abdul-Nab, and Nadia Alani. "Study of impact of art performance level of blue laser technology applications and its control." Indonesian Journal of Electrical Engineering and Computer Science 17, no. 3 (March 1, 2020): 1383. http://dx.doi.org/10.11591/ijeecs.v17.i3.pp1383-1389.

Full text

Abstract:

In this work; we present an enhancement in blue laser diodes with new factors and applications for modern technology such as underwater telecommunications, bio-sensor and bio-medical systems etc. Years of advance meanwhile have much enhanced laser performance, and extremely improved their diversity, making lasers significant parts in scientific research, telecommunications, engineering, bio-medical imaging, materials working, and a swarm of other applications. This article viewing how laser technology has progressed to chance application requirements. The enhanced blue laser building diagrams to get a peak efficiency% at room temperature with modification. Moreover, we have as well estimated electro-optical performance packing of blue laser diodes been significantly various associated to GaAs laser method and novel developments and performances are required to enhance the optical power from anther laser diodes. Researchers need enhanced approaches to accurately make new the blue laser applications to use control of modern experimental measurements and optical communication.

APA, Harvard, Vancouver, ISO, and other styles

45

Qin, Shuai, Hui Huang, Kaiqian Jie, Sirui Zeng, Li Chen, Hongzhan Liu, Jianping Guo, et al. "Active Modulating the Intensity of Bifocal Metalens with Electrically Tunable Barium Titanate (BTO) Nanofins." Nanomaterials 11, no. 8 (August 8, 2021): 2023. http://dx.doi.org/10.3390/nano11082023.

Full text

Abstract:

The multifocal metalens with an adjustable intensity has great potential in many applications such as the multi-imaging system, but it is less studied. In this paper, by combining the electro-optic material barium titanate (BTO) with the Pancharatnam-Berry phase, an electrically modulated bifocal metalens in a visible light band is innovatively proposed. Due to the electro-optic effect, we can control the refractive index of the BTO nanofins to vary between 2.4 and 3.07 by applying different voltages (0–60 V). Thus, the method of modulating the intensity ratio of the two focal points is applying an electric field. It is different from using phase change materials or changing the ellipticity of incident light, the strategies proposed in previous studies. Moreover, when the applied voltage is 0 V or 60 V, the bifocal metalens becomes a single focal metalens with different focal lengths, and the full width at half maximum of each focal point is close to the diffraction limit. It has great potential in applications of optical storage, communication and imaging systems.

APA, Harvard, Vancouver, ISO, and other styles

46

Lei, Mingwei, Wenyan Gao, Guang Li, Xinping Wu, Benhai Li, Xuefeng Wang, and Junlong Wang. "Good-Quality and High-Efficiency Dicing for Thick LiNbO3 Wafers Using Picosecond Laser Pulses." Micromachines 11, no. 1 (December 31, 2019): 51. http://dx.doi.org/10.3390/mi11010051.

Full text

Abstract:

Lithium niobate (LiNbO3) has become popular with applications in electronics and communication industries due to its excellent electro-optical and nonlinear properties. This paper presents the influence of laser power, repetition frequency, number of subpulses, depth of each pass, and scanning velocity in picosecond laser dicing on multiple characteristics of LiNbO3 using the Taguchi method. By means of analysis of variance and analysis of relations between the characteristics, the optimal ps-laser-dicing parameter is obtained with good quality and high efficiency, which is applied to LiNbO3 products. The result indicates that picosecond laser dicing provides an alternative to machine thick LiNbO3 wafers with narrow kerf width, micro chipping, smooth surface, and high productivity.

APA, Harvard, Vancouver, ISO, and other styles

47

Das, Himanshu R., and Subhash C. Arya. "Investigation of a V-shaped ITO-plasmonic material based electro-absorption modulator for PIC and high-speed optical communication systems." Journal of Modern Optics 68, no. 8 (March 31, 2021): 440–49. http://dx.doi.org/10.1080/09500340.2021.1909158.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Roy Frieden, B. "Information and estimation in image processing." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 14–17. http://dx.doi.org/10.1017/s0424820100125142.

Full text

Abstract:

Despite the skill and determination of electro-optical system designers, the images acquired using their best designs often suffer from blur and noise. The aim of an “image enhancer” such as myself is to improve these poor images, usually by digital means, such that they better resemble the true, “optical object,” input to the system. This problem is notoriously “ill-posed,” i.e. any direct approach at inversion of the image data suffers strongly from the presence of even a small amount of noise in the data. In fact, the fluctuations engendered in neighboring output values tend to be strongly negative-correlated, so that the output spatially oscillates up and down, with large amplitude, about the true object. What can be done about this situation? As we shall see, various concepts taken from statistical communication theory have proven to be of real use in attacking this problem. We offer below a brief summary of these concepts.

APA, Harvard, Vancouver, ISO, and other styles

49

Wijayanto, Yusuf Nur, Atsushi Kanno, Hiroshi Murata, Tetsuya Kawanishi, Naokatsu Yamamoto, and Yasuyuki Okamura. "Array of patch-antennas with meandering-gaps on optical modulator for wireless millimeter-wave beam-steering." International Journal of Microwave and Wireless Technologies 8, no. 4-5 (March 16, 2016): 759–65. http://dx.doi.org/10.1017/s1759078716000210.

Full text

Abstract:

An array of patch-antennas with meandering-gaps on an optical modulator is proposed for wireless millimeter-wave beam-steering through high-speed radio-over-fiber systems. Wireless millimeter-wave can be received by the array of patch-antennas and directly modulated to lightwave by the optical modulator. The wireless millimeter-wave can be steered using the meandering-gaps at the patch-antennas by controlling interaction between millimeter-wave and lightwave electric fields in electro-optic modulation. The basic operation and analysis of the proposed device are discussed. In the experiment, 5 × 5 antenna array in 40 GHz millimeter-wave bands was designed and realized for device characterization and demonstration to wireless millimeter-wave beam-steering. There were five variations of wireless millimeter-wave beam-steering for one-dimensional in xz- or yz-planes that can be obtained with wireless millimeter-wave steerable beams of about ±30°. Additionally, 25 variations of wireless beam-steering can be obtained for two dimension in xyz-space through orthogonal optical modulation. The proposed device is promising to be applied in millimeter-wave/tera-hertz bands for future directional wireless communication and sensing with high-speed and high-resolution operation.

APA, Harvard, Vancouver, ISO, and other styles

50

Cai, Ming, Shulong Wang, Zhihong Liu, Yindi Wang, Tao Han, and Hongxia Liu. "Graphene Electro-Optical Switch Modulator by Adjusting Propagation Length Based on Hybrid Plasmonic Waveguide in Infrared Band." Sensors 20, no. 10 (May 18, 2020): 2864. http://dx.doi.org/10.3390/s20102864.

Full text

Abstract:

A modulator is the core of many optoelectronic applications such as communication and sensing. However, a traditional modulator can hardly reach high modulation depth. In order to achieve the higher modulation depth, a graphene electro-optical switch modulator is proposed by adjusting propagation length in the near infrared band. The switch modulator is designed based on a hybrid plasmonic waveguide structure, which is comprised of an SiO2 substrate, graphene–Si–graphene heterostructure, Ag nanowire and SiO2 cladding. The propagation length of the hybrid plasmonic waveguide varies from 0.14 μm to 20.43 μm by the voltage tunability of graphene in 1550 nm incident light. A modulator with a length of 3 μm is designed based on the hybrid waveguide and it achieves about 100% modulation depth. The lower energy loss (~1.71 fJ/bit) and larger 3 dB bandwidth (~83.91 GHz) are attractive for its application in a photoelectric integration field. In addition, the excellent robustness (error of modulation effects lower than 8.84%) is practical in the fabrication process. Most importantly, by using the method of adjusting propagation length, other types of graphene modulators can also achieve about 100% modulation depth.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Electro-optical communication'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles