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Journal articles on the topic 'Optical Modulation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chao Liu, Chao Liu, Di Wang Di Wang, Lixiao Yao Lixiao Yao, Lei Li Lei Li, and Qionghua Wang Qionghua Wang. "Optical attenuator based on phase modulation of a spatial light modulator." Chinese Optics Letters 13, no. 8 (2015): 082301–82304. http://dx.doi.org/10.3788/col201513.082301.

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2

Li, Minwei, Yang Yu, Yang Lu, et al. "Optical Microfiber All-Optical Phase Modulator for Fiber Optic Hydrophone." Nanomaterials 11, no. 9 (2021): 2215. http://dx.doi.org/10.3390/nano11092215.

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In order to meet the needs of phase generated carrier (PGC) demodulation technology for interferometric fiber optic hydrophones, we proposed an optical microfiber all-optical phase modulator (OMAOPM) based on the photo-induced thermal phase shift effect, which can be used as a phase carrier generation component, so as to make the modulation efficiency and working bandwidth of this type of modulator satisfy the requirements of underwater acoustic signal demodulation applications. We analyzed the modulation principle of this modulator and optimized the structural parameters of the optical microf

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3

Zheng, Ningxuan, Wenliang Liu, Jizhou Wu, Yuqing Li, Vladimir Sovkov, and Jie Ma. "Parametric Excitation of Ultracold Sodium Atoms in an Optical Dipole Trap." Photonics 9, no. 7 (2022): 442. http://dx.doi.org/10.3390/photonics9070442.

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Parametric modulation is an effective tool to measure the trap frequency and investigate the atom dynamics in an optical dipole trap or lattices. Herein, we report on experimental research of parametric resonances in an optical dipole trap. By modulating the trapping potential, we have measured the atomic loss dependence on the frequency of the parametric modulations. The resonance loss spectra and the evolution of atom populations at the resonant frequency have been demonstrated and compared under three modulation waveforms (sine, triangle and square waves). A phenomenological theoretical sim

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4

Hyun, Young-Jin, Jae-Young Choi, and Sang-Kook Han. "Dual Polarization Simultaneous Optical Intensity Modulation in Single Birefringent LiNbO3 Mach–Zehnder Optical Modulator." Photonics 9, no. 6 (2022): 386. http://dx.doi.org/10.3390/photonics9060386.

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A new method of simultaneous modulation of dual-polarization intensity based on a single LiNbO3 Mach–Zehnder modulator (MZM) is proposed. Using the birefringence of lithium niobate, the bipolar optical intensity can be modulated independently with the proposed modulation condition. In this paper, the optimized modulation conditions and the performance of the proposed method are investigated through simulations and experiments.

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5

Kawanishi, Tetsuya. "Precise Optical Modulation and Its Application to Optoelectronic Device Measurement." Photonics 8, no. 5 (2021): 160. http://dx.doi.org/10.3390/photonics8050160.

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Optoelectronic devices which play important roles in high-speed optical fiber networks can offer effective measurement methods for optoelectronic devices including optical modulators and photodetectors. Precise optical signal modulation is required for measurement applications. This paper focuses on high-speed and precise optical modulation devices and their application to device measurement. Optical modulators using electro-optic effect offers precise control of lightwaves for wideband signals. As examples, this paper describes frequency response measurement of photodetectors using high-preci

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6

Ujang, Febrizal. "Eliminating Dispersion Power Fading in Radio over Fiber Communication through Unbalanced Sideband Modulation." International Journal of Electrical and Electronic Engineering & Telecommunications 13, no. 6 (2024): 456–66. http://dx.doi.org/10.18178/ijeetc.13.6.456-466.

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In Radio Over Fiber (RoF) systems, a commonly used approach to reduce the Dispersion Power Fading (DPF) effects is to convert the spectrum of modulated optical signals into Optical Single Sideband (OSSB). This process can be done by modulating the optical carrier using two RF signals that differ in phase by 90. The optical modulator used is the Dual-Drive Mach Zehnder Modulator (DD-MZM). However, implementing this modulation scheme requires a complex transmitter setup. In this study, a novel technique is proposed to address DPF, called as Unbalanced Sideband Modulation (USM). USM is generated

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7

Ozaki, Kouta, Keita Kikuchi, Guangtao Zhu, et al. "Noise mechanism clarification in external-modulation Brillouin optical correlation-domain reflectometry with double-sideband modulator." Japanese Journal of Applied Physics 63, no. 7 (2024): 070904. http://dx.doi.org/10.35848/1347-4065/ad5f6c.

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Abstract Brillouin optical correlation-domain reflectometry (BOCDR) allows for relatively high spatial resolution and random accessibility with single-end light injection into the sensing fiber. Typically, BOCDR relies on directly modulating the laser diode’s driving current, which facilitates sinusoidal frequency modulation for distributed sensing but also introduces unintended power modulation that can degrade performance. To address these power variations, external-modulation BOCDR using a double-sideband modulator has been developed. However, this method generates substantial noise, overpo

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8

Vikas, Agrawal, Basak Koushik, and Kumar Bahl Rajesh. "Analytical research on optical phase shift modulation scheme with maximum modulation efficiency for analog and digital signals." i-manager's Journal on Communication Engineering and Systems 11, no. 2 (2022): 1. http://dx.doi.org/10.26634/jcs.11.2.19048.

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This paper presents the analytical research and characterization of optical Binary Phase Shift Keying (BPSK) for single-tone sinusoidal and digital signals. The mathematical analysis and simulation for optimal modulation depth are proposed in this paper for maximum efficiency of the output modulated signal. The modulation depth is analysed with suitable Radio Frequency (RF) drive voltage for message signal and the effect of modulation depth on carrier suppression and higher order harmonics over fundamental tone is analysed theoretically and with simulation. To achieve phase modulation in this

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9

Tanyi, Gregory Beti, Miao Sun, Christina Lim, and Ranjith Rajasekharan Unnithan. "Design of an On-Chip Plasmonic Modulator Based on Hybrid Orthogonal Junctions Using Vanadium Dioxide." Nanomaterials 11, no. 10 (2021): 2507. http://dx.doi.org/10.3390/nano11102507.

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We present the design of a plasmonic modulator based on hybrid orthogonal silver junctions using vanadium dioxide as the modulating material on a silicon-on-insulator. The modulator has an ultra-compact footprint of 1.8 μm × 1 μm with a 100 nm × 100 nm modulating section based on the hybrid orthogonal geometry. The modulator takes advantage of the large change in the refractive index of vanadium dioxide during its phase transition to achieve a high modulation depth of 46.89 dB/μm. The simulated device has potential applications in the development of next generation high frequency photonic modu

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10

Bai, Jiang Ling, Li Bin Zhong, Wen Hai Xu, and Jian Lin. "Research on Optical Signal Carrier Transmission Technology." Advanced Materials Research 1022 (August 2014): 193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.193.

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This paper studies the single-sideband RF signals in the optical carrier side than the problem. RF signals modulated optical carrier OSSB + C modulation index is usually small, leading edge modulated carrier radio frequency signal generated by the optical carrier ratio is not ideal. A design scheme based on three-arm and four-arm MZM MZM optimized optical carrier single sideband radio frequency signal containing the edge ratio. By adjusting the DC bias voltage of the modulator can control the carrier side than the light signal. For any modulation index, are able to make the optical carrier sin

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11

Li, Guang. "A High Speed Radio on Fiber Based on Optical Double-Sidebands via Optical Filter and Optical Phase Modulation." Advanced Materials Research 988 (July 2014): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amr.988.636.

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We demonstrate a system scheme of generating and transmitting base-band and radio frequency signal based on optical double-sidebands scheme to generate optical millimeter-wave signal via optical phase modulation (OPM) and FBG. The system architecture with the source of laser at central station, the data re-modulation on downlink optical carrier gained from one base station is a good method to reduce the cost of uplink transmitter, for it does not needs the source of laser and wavelength administration at the base station. The optical phase modulator is inexpensive and mature. The downlink comm

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12

Bzhenchakivskyi, Valentyn. "Methods of active light modulation." Computational Problems of Electrical Engineering 14, no. 2 (2024): 1–5. https://doi.org/10.23939/jcpee2024.02.001.

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Active light modulation enables precise control over such light properties as intensity, phase, frequency, and polarization. This article examines electrooptic (EO), acousto-optic (AO), and magneto-optic (MO) modulation methods, analyzing their principles, advantages, and limitations for high-speed optical systems. The EO modulation, based on changes in the refractive index under the influence of an electric field, provides ultrafast signal modulation but is sensitive to electromagnetic interference. The AO modulation uses acoustic waves to periodically vary the refractive index, allowing high

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13

Shen, Ning, Honglong Hu, Zhaoyi Wang, Yuxing Zhan, Conglong Yuan, and Zhigang Zheng. "Light-activated film diffractive optical elements enable diversified optical field modulation." Chinese Optics Letters 23, no. 1 (2025): 011602. https://doi.org/10.3788/col202523.011602.

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14

Hua, Chu Yi, Menke Neimule, Jie Zhou, Chen Zhang, and Peng Wang. "Theoretical Simulation and Preparation of Magneto-Optical Modulator." Advanced Materials Research 403-408 (November 2011): 2368–73. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.2368.

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Magneto-Optical modulation technology has become key component in many optical information systems. However, due to the abstract theoretical knowledge, many textbooks do not introduce the properties of circular anisotropy, so it is difficult for most students to understand the polarization properties of light accurately and in depth. In this paper, the processes of Magneto-Optical modulation are Three-Dimensionally dynamically simulated by using MATLAB software first. These simulations make the complex and abstract light propagation processes become visual, which are effective aids for optics’

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15

Hayrapetyan, Yegisabet Hakob, and Stepan Karen Petrosyan. "Construction Features of The High-Precision Laser Rangefinder Light Modulator." Journal of Architectural and Engineering Research 1, no. 1 (2021): 26–31. http://dx.doi.org/10.54338/27382656-2021.1-5.

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The issues related to the development of a light modulator operating on the electro-optical effect of laser rangefinders by the modulation method are considered. To reduce the modulation power, it is proposed to lower the modulation frequency to 750-800 MHz, while simultaneously increasing the modulation quality to Q = 1000. The study of the phase determination error of a high-precision laser rangefinder depending on temperature showed that it is rational to construct the light modulator by radial installation of the KDP electro-optical crystal, with separated modulation and demodulation chann

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16

Vikas, Agrawal, P. K. Pandey, and R. K. Bahl. "Development of high data rate optical transmitter in c-band using external modulation technique." i-manager’s Journal on Electronics Engineering 12, no. 2 (2022): 1. http://dx.doi.org/10.26634/jele.12.2.18517.

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This paper presents the development and characterization of high-speed ON-OFF Keying (OOK) Optical Transmitter up to 12 Gbps using External Modulation Technique that comprises Continuous Wave (CW) laser, Mach-Zehnder Modulator (MZM), and ultra-high bandwidth driver amplifier for MZM. The CW laser driver and high bandwidth modulator driver amplifier has been designed and integrated with the modulator which is biased for OOK modulation scheme. This work includes Direct Current (DC), Optical and Radio Frequency (RF) characterization of MZM modulator; selection of suitable bias point for modulator

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17

Zhou, Zexin, Miao Yan, Hu Liang, et al. "Novel Optical Modulator Photonic Device Based on TiN/Ti3C2 Heterojunction." Sensors 24, no. 16 (2024): 5190. http://dx.doi.org/10.3390/s24165190.

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Due to the ability of optical modulators to achieve rapid modulation of optical signals, meeting the demands of high-speed data transmission, modulators based on different novel nanomaterials have become one of the research hotspots over the past dacade. Recently, TiN/Ti3C2 heterojunction exhibits highly efficient thermo-optic performance and extremely strong stability. Therefore, we have demonstrated an all-optical modulator based on the principle of Michelson interference and the thermo-optic effect in this paper. The modulator employs a TiN/Ti3C2 heterojunction-coated microfiber (THM) and f

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18

Sun, Qiang, and Guang Chao Liu. "Research on PZT Phase Modulator Applied in Optical Cable Identification Device." Applied Mechanics and Materials 668-669 (October 2014): 852–56. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.852.

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The optical cable identification device is based on Sagnac interference principle, which is able to sense the optical phase shift.Phase modulation can improve the sensing sensitivity.In this paper,the feasibility of the piezoelectric ceramic used as phase modulator and its application in optical cable identification device have been analyzed theoretically. We have designed a PZT phase modulator by using P-5 type piezoelectric ceramic tube.Finally, the modulation principle of the PZT phase modulator has been tested by using optical cable identification device. The PZT phase modulator has a good

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19

Ho, Keang-Po. "Optical Duobinary Modulation." Recent Patents on Engineering 4, no. 2 (2010): 80–85. http://dx.doi.org/10.2174/187221210791233452.

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20

Mesleh, Raed, Hany Elgala, and Harald Haas. "Optical Spatial Modulation." Journal of Optical Communications and Networking 3, no. 3 (2011): 234. http://dx.doi.org/10.1364/jocn.3.000234.

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21

Chen, Der Chin, and Jing Yuan Su. "Near-Infrared Electro-Optics Modulation Coding Technology Using the Aperture Module with the Changeable Stop." Applied Mechanics and Materials 284-287 (January 2013): 2872–75. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2872.

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In this paper we demonstrate a new technology in which we use the spatial optical modulation with trigger pulse width and pulse width modulation of light source (LED,LD) to build the near-infrared electro-optics modulation coding system (NIEOMCS). Using the optical coupler to let the pulse modulation near infrared LED collimated light of transmitter enter into an optical fiber and spatial optical modulator, the electro-optics modulation signal is then detected by the photodiode of the receiver. Because of aperture module with three changeable stop sizes and three duty cycles of light signal, t

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22

Li, Erkang, Man Jiang, Duidui Li, et al. "Nanosecond-scale all-optical Ti₃C₂T _x -MXene modulator." Applied Physics Express 15, no. 2 (2022): 022008. http://dx.doi.org/10.35848/1882-0786/ac4a12.

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Abstract Inspired by recent advancements of graphene-based ultrafast photonic devices, Ti3C2T x -MXene, as a graphene-like two-dimensional layer-structure material, has gained extensive interest in nonlinear optical applications, especially in all-optical intensity modulation. Herein, we successfully fabricated an all-optical modulator based on Ti3C2T x -Mxene/polyvinyl-alcohol film with nanosecond-scale response time, modulation speed of 100 kHz, and modulation depth of 10%. Furthermore, the variation of fall edges of modulated signal pulse caused by thermo-optic effect under different pump p

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23

Piyapatarakul, Tipat, Hanzhi Tang, Kasidit Toprasertpong, Shinichi Takagi та Mitsuru Takenaka. "Numerical analysis of optical phase modulator operating at 2 μm wavelength using graphene/III–V hybrid metal-oxide-semiconductor capacitor". Japanese Journal of Applied Physics 61, SC (2022): SC1031. http://dx.doi.org/10.35848/1347-4065/ac4443.

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Abstract We propose an optical phase modulator with a hybrid metal-oxide-semiconductor (MOS) capacitor, consisting of single-layer graphene and III–V semiconductor waveguide. The proposed modulator is numerically analyzed in conjunction with the surface conductivity model of graphene. Since the absorption of graphene at a 2 μm wavelength can be suppressed by modulating the chemical potential of graphene with the practical gate bias, the phase modulation efficiency is predicted to be 0.051 V·cm with a total insertion loss of 0.85 dB when an n-InGaAs waveguide is used, showing the feasibility of

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24

Nayak, Banoj Kumar, and Eyal Buks. "Polarization-selective magneto-optical modulation." Journal of Applied Physics 132, no. 19 (2022): 193905. http://dx.doi.org/10.1063/5.0128647.

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We study magneto-optical coupling in a ferrimagnetic sphere resonator made of yttrium iron garnet. We find that the resonator can be operated in the telecom band as a polarization-selective optical modulator. The input state of polarization (SOP) contributing to the Stokes sideband is orthogonal to the one contributing to the anti-Stokes sideband. In the region of single sideband modulation, the SOP of both sidebands is nearly orthogonal to the SOP of the incident light. Intermodulation gain can be employed in the nonlinear regime for amplification.

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25

Sun, Feiying, Changbin Nie, Xingzhan Wei, Hu Mao, Yupeng Zhang, and Guo Ping Wang. "All-optical modulation based on MoS₂-Plasmonic nanoslit hybrid structures." Nanophotonics 10, no. 16 (2021): 3957–65. http://dx.doi.org/10.1515/nanoph-2021-0279.

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Abstract Two-dimensional (2D) materials with excellent optical properties and complementary metal-oxide-semiconductor (CMOS) compatibility have promising application prospects for developing highly efficient, small-scale all-optical modulators. However, due to the weak nonlinear light-material interaction, high power density and large contact area are usually required, resulting in low light modulation efficiency. In addition, the use of such large-band-gap materials limits the modulation wavelength. In this study, we propose an all-optical modulator integrated Si waveguide and single-layer Mo

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26

Agruzov, Peter, Mikhail Parfenov, Igor Ilichev, Andrei Varlamov, Aleksandr Tronev, and Aleksandr Shamrai. "The Optimal Operating Point for Linearizing an Integrated Optical Lithium Niobate Directional Coupler Modulator." Photonics 11, no. 1 (2024): 48. http://dx.doi.org/10.3390/photonics11010048.

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The influence of an operating point on the linearity of an integrated optical lithium niobate directional coupler modulator was studied. It was found that the optimal setting for the position of an operating point for suppressing the third-order intermodulation distortion depended on the power of the high-frequency modulation signal. Thus, despite the simple design of the device, the directional coupler modulator requires a complex algorithm for setting an operating point to achieve a high linearity of operation. An active system for setting an operating point based on the low-frequency pilot

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27

Zhou, Zhipeng, Zean Li, Cheng Qiu, et al. "A Design of High-Efficiency: Vertical Accumulation Modulators Based on Silicon Photonics." Nanomaterials 13, no. 24 (2023): 3157. http://dx.doi.org/10.3390/nano13243157.

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On-chip optical modulators, which are capable of converting electrical signals into optical signals, constitute the foundational components of photonic devices. Photonics modulators exhibiting high modulation efficiency and low insertion loss are highly sought after in numerous critical applications, such as optical phase steering, optical coherent imaging, and optical computing. This paper introduces a novel accumulation-type vertical modulator structure based on a silicon photonics platform. By incorporating a high-K dielectric layer of ZrO2, we have observed an increase in modulation effici

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28

赖, 家仓. "Modulation Characteristics of PZT Optical Fiber Phase Modulator." Journal of Sensor Technology and Application 09, no. 01 (2021): 17–23. http://dx.doi.org/10.12677/jsta.2021.91003.

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29

Xu, Longtao, Shilei Jin, and Yifei Li. "Nonlinear Phase Modulation Inside an MQW Optical Modulator." Journal of Lightwave Technology 34, no. 14 (2016): 3300–3305. http://dx.doi.org/10.1109/jlt.2016.2565606.

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30

Zervas, M. N., and I. P. Giles. "Optical-fiber phase modulator with enhanced modulation efficiency." Optics Letters 13, no. 5 (1988): 404. http://dx.doi.org/10.1364/ol.13.000404.

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31

Dye, S. P., and N. J. Gomes. "Dual-modulation compensation for optical intensity modulator nonlinearities." IEEE Photonics Technology Letters 8, no. 1 (1996): 72–74. http://dx.doi.org/10.1109/68.475782.

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32

Leo Pauline, S., and T. R. Ganesh Babu. "Design of Leveraging Split Ring Resonators for Optoelectronic Modulation: Advancements in Optical Signal Processing and Communication Systems." Journal of Nanoelectronics and Optoelectronics 19, no. 8 (2024): 832–42. http://dx.doi.org/10.1166/jno.2024.3639.

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Optoelectronic modulators play a pivotal role in shaping the landscape of optical signal processing and communication systems, enabling crucial functionalities such as signal modulation and routing. This paper explores the potential of Split Ring Resonator (SRR) structures in advancing optoelectronic modulation techniques. Leveraging the unique electromagnetic properties of SRRs, this study investigates their efficacy in modulating the amplitude, phase, or polarization of optical signals, offering promising prospects for enhancing the performance and functionality of optical communication netw

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33

M, Adarsha, S. Malathi, and Santosh Kumar. "Analysis of System Capacity and Spectral Efficiency of Fixed-Grid Network." International journal of Computer Networks & Communications 15, no. 5 (2023): 93–111. http://dx.doi.org/10.5121/ijcnc.2023.15506.

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In this article, the performance of a fixed grid network is examined for various modulation formats to estimate the system's capacity and spectral efficiency. The optical In-phase Quadrature Modulator (IQM) structure is used to build a fixed grid network modulation, and the homodyne detection approach is used for the receiver. Data multiplexing is accomplished using the Polarization Division Multiplexed (PDM) technology. 100 Gbps, 150 Gbps, and 200 Gbps data rates are transmitted under these circumstances utilizing various modulation formats. Various pre-processing and signal recovery steps ar

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34

Ogawa, Kensuke. "Increase in Modulation Speed of Silicon Photonics Modulator with Quantum-Well Slab Wings: New Insights from a Numerical Study." Photonics 11, no. 6 (2024): 535. http://dx.doi.org/10.3390/photonics11060535.

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A Silicon Photonics modulator is a high-speed photonic integrated circuit for optical data transmission in high-capacity optical networks. Silicon Photonics modulators in the configuration of a Mach–Zehnder interferometer, in which a PN-junction rib-waveguide phase shifter is inserted in each arm of the interferometer, are studied in this paper because of their superior performance of high-quality optical data generation in a wide range of spectral bands and their simplicity in fabrication processes suitable to production in foundries. Design, fabrication, and fundamental characteristics of Si

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Grinblat, Gustavo, Haizhong Zhang, Michael P. Nielsen, et al. "Efficient ultrafast all-optical modulation in a nonlinear crystalline gallium phosphide nanodisk at the anapole excitation." Science Advances 6, no. 34 (2020): eabb3123. http://dx.doi.org/10.1126/sciadv.abb3123.

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High–refractive index nanostructured dielectrics have the ability to locally enhance electromagnetic fields with low losses while presenting high third-order nonlinearities. In this work, we exploit these characteristics to achieve efficient ultrafast all-optical modulation in a crystalline gallium phosphide (GaP) nanoantenna through the optical Kerr effect (OKE) and two-photon absorption (TPA) in the visible/near-infrared range. We show that an individual GaP nanodisk can yield differential reflectivity modulations of up to ~40%, with characteristic modulation times between 14 and 66 fs, when

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36

Kareem, Marwa M., Sameer A. S. Lafta, Hadi Fakhir Hashim, Raed Khalid Al-Azzawi, and Adnan Hussein Ali. "Analyzing the BER and optical fiber length performances in OFDM RoF links." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1501. http://dx.doi.org/10.11591/ijeecs.v23.i3.pp1501-1509.

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Radio over fiber (RoF) can be assessed as a system of most convenient combination of optical fiber and radio signals. The technique of orthogonal frequency division multiplexing (OFDM) considers as a data distribution over a huge number of carriers having spaced from each other with specific frequencies at overlap bands. Hence incorporates OFDM with the optical fiber, OFDM-RoF system can be increased the modulation RF access capacity besides high-speed data transmission, it considers a broadband communication trend of the current and future applications specifically for 5G mobile. The optical

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37

Kareem, Marwah M., Sameer A. S. Lafta, Hadi Fakhir Hashim, Raed Khalid Al-Azzawi, and Adnan Hussein Ali. "Analyzing the BER and optical fiber length performances in OFDM RoF links." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1501–9. https://doi.org/10.11591/ijeecs.v23.i3.pp1501-1509.

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Radio over fiber (RoF) can be assessed as a system of most convenient combination of optical fiber and radio signals. The technique of orthogonal frequency division multiplexing (OFDM) considers as a data distribution over a huge number of carriers having spaced from each other with specific frequencies at overlap bands. Hence incorporates OFDM with the optical fiber, OFDM-RoF system can be increased the modulation RF access capacity besides high-speed data transmission, it considers a broadband communication trend of the current and future applications specifically for 5G mobile. The optical

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38

Khan, Jan Amir, Evan Heller, and Faquir Jain. "Characterization of Ge Quantum Dot Optical Waveguides for High Speed Optical Modulators." International Journal of High Speed Electronics and Systems 27, no. 01n02 (2018): 1840001. http://dx.doi.org/10.1142/s0129156418400013.

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Quantum Dot (QD) Optical Modulators can provide high speed modulation in low cost indirect bandgap materials. Si based optical modulators can be realized with the inclusion of self-assembled Ge QDs to provide low cost, high speed CMOS compatible optical devices. In this paper, we present the optical characterization of a novel Ge-QD Si-SiO2 based waveguide for use in as an optical modulator. Optical performance figures of merit are investigated including insertion loss (IL) measurements, and Wavelength dependent loss (WDL). We present a multimode waveguide fabricated with conventional CMOS pro

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39

Zhao, Chenyu, Dayong Wang, Shufeng Lin, Jie Zhao, Yunxin Wang, and Lu Rong. "Design Optimization of Silicon-Based Optically Excited Terahertz Wave Modulation." Photonics 11, no. 3 (2024): 202. http://dx.doi.org/10.3390/photonics11030202.

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The modulation of a terahertz (THz) wave on amplitude, phase and polarization is important for the application of THz technology, especially in the field of imaging, and is one of the current research hotspots. Silicon-based, optically excited THz modulator is a wavefront modulation technique with a simple, compact and reconfigurable optical path. It can realize the dynamic modulation of THz wavefronts by only changing the projected two-dimensional pattern, but it still suffers from the problems of lower modulation efficiency and slower modulation rates. In this article, the Drude model in com

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40

Bin Zhang, Bin Zhang, Shiyu Liu Shiyu Liu, Xianzhu Tang Xianzhu Tang, and and Jian'gang Lu and Jian'gang Lu. "Adaptive modulation system for liquid crystal phase modulator." Chinese Optics Letters 14, no. 9 (2016): 090604–90607. http://dx.doi.org/10.3788/col201614.090604.

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41

Goncharov, D. S., N. N. Evtikhiev, V. V. Krasnov, N. M. Ponomarev, and R. S. Starikov. "The influence of additional phase modulation of an amplitude liquid crystal STLM on the image recognition characteristics in the invariant optical digital correlator." Computer Optics 43, no. 2 (2019): 200–208. http://dx.doi.org/10.18287/2412-6179-2019-43-2-200-208.

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We present the results of measurements of additional phase modulation characteristics of a serial amplitude liquid crystal spatial light modulator HoloEye LC 2002. It is found in which way the phase shift of the liquid crystal spatial light modulator depends on the applied signal. The mathematical simulation of the performance of an invariant diffractive optical-digital correlator based on a liquid crystal spatial light modulator with the amplitude-dependent phase shift is carried out using previously measured data. The correlation filters used in the work are an optimal tradeoff maximum avera

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Kang, Haoyan, Hao Wang, Jiachi Ye, et al. "Michelson Interferometric Methods for Full Optical Complex Convolution." Nanomaterials 14, no. 15 (2024): 1262. http://dx.doi.org/10.3390/nano14151262.

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Optical real-time data processing is advancing fields like tensor algebra acceleration, cryptography, and digital holography. This technology offers advantages such as reduced complexity through optical fast Fourier transform and passive dot-product multiplication. In this study, the proposed Reconfigurable Complex Convolution Module (RCCM) is capable of independently modulating both phase and amplitude over two million pixels. This research is relevant for applications in optical computing, hardware acceleration, encryption, and machine learning, where precise signal modulation is crucial. We

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Xu, Fan, Shun Zhang, Xiangyu Gao, et al. "A High-Speed Silicon Ring Modulator with a Large Working Wavelength Range." Electronics 13, no. 15 (2024): 2890. http://dx.doi.org/10.3390/electronics13152890.

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With the advantages of high speed, small size, and easy integration, the silicon photonic resonant ring modulator has gradually become a critical device for emerging integrated optical platforms. Ring modulators are primarily used in optical communications, optical computing, artificial intelligence, and other fields. In this work, the proposed ring modulator can operate in both the O- and C-bands. The 3 dB electro-optical (EO) bandwidth of the ring modulator is 39 GHz and 34 GHz at −4 V in the O-band and C-band, respectively. The modulation efficiency of the device is 0.92 V·cm and 0.95 V·cm

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Druessel, Jeff, Peter Haaland, and Jeff Grantham. "Optimal phase modulation for gradient-index optical filters." Optics Letters 18, no. 19 (1993): 1583. http://dx.doi.org/10.1364/ol.18.001583.

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Smith, Daniel, Shivasubramanian Gopinath, Francis Gracy Arockiaraj, et al. "Nonlinear Reconstruction of Images from Patterns Generated by Deterministic or Random Optical Masks—Concepts and Review of Research." Journal of Imaging 8, no. 6 (2022): 174. http://dx.doi.org/10.3390/jimaging8060174.

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Indirect-imaging methods involve at least two steps, namely optical recording and computational reconstruction. The optical-recording process uses an optical modulator that transforms the light from the object into a typical intensity distribution. This distribution is numerically processed to reconstruct the object’s image corresponding to different spatial and spectral dimensions. There have been numerous optical-modulation functions and reconstruction methods developed in the past few years for different applications. In most cases, a compatible pair of the optical-modulation function and r

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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 (2020): 2864. http://dx.doi.org/10.3390/s20102864.

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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

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Yao, Hai-Yun, Xin Yan, Lan-Ju Liang, et al. "Terahertz dynamic multidimensional modulation at Dirac point based on patterned graphene/gallium nitride hybridized with metasurfaces." Acta Physica Sinica 71, no. 6 (2022): 068101. http://dx.doi.org/10.7498/aps.71.20211845.

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The development of terahertz (THz) technology is creating a demand for devices that can modulate THz beams. Here, we propose a novel THz modulator based on patterned graphene/gallium nitride Schottky diodes hybridized with metasurfaces. Ultrasensitive dynamic multidimensional THz modulation is achieved by changing the Schottky barrier of the heterojunction, shifting the Fermi level between the Dirac point, changing the conduction band and the valence of graphene via continuous-wave optical illumination or bias voltages. When the Fermi level is close to the Dirac point, the modulation is ultras

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Fàbrega, Josep Maria, Javier Vilchez, Moreolo Michela Svaluto, and Laia Nadal. "Experimental Analysis of 8-QAM Constellations for Adaptive Optical OFDM Systems." IEEE Photonics Technology Letters 28, no. 4 (2016): 445–48. https://doi.org/10.5281/zenodo.46551.

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In this letter, we numerically and experimentally evaluate the influence of adopting different 8-QAM constellations. The performance of flexible/adaptive direct detection optical orthogonal frequency division multiplexing transmission systems has been evaluated in the back-to-back configuration. Metro/regional network scenario is also considered using the four-node photonic mesh network of the ADRENALINE testbed. In general, different optical paths of the network ranging from 50 to 185 km are analyzed to asses the optimal 8-QAM format, which maximizes the system performance. In addition, singl

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Liu, Zhao Xu, Xiao Gang Chen, and Chao Jiang. "Performance Evaluation of Optical Carrier Suppression Radio over Fiber System through Modulation Index Enhancement." Advanced Materials Research 756-759 (September 2013): 1190–93. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1190.

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The performance of optical carrier suppression (OCS) radio over fiber (RoF) system is evaluated through tuning the modulation index of Mach-Zehnder modulator, and two different data modulation schemes are considered. The quantitative simulation results validate that there exist an optimum modulation index, and the system performance could be improved if the data signal is modulated on only one of two sidebands.

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Chen, Xiaogang. "Performance improvement of octupling millimeter wave generation through modulation index optimization." Modern Physics Letters B 32, no. 34n36 (2018): 1840104. http://dx.doi.org/10.1142/s0217984918401048.

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Performance improvement for optical generation of octupling millimeter wave signal based on dual-parallel Mach–Zehnder modulator (MZM) without optical filtering through optimization of modulation index of MZM is proposed. Theoretical derivation and simulation verification are provided for the octupling millimeter wave generation scheme, extinction ratio (EXT) of practical MZM is considered. The effect of imperfect EXT of commercially available MZM on optical sideband suppression ratio (OSSR) and RF spurious suppression ratio (RSSR) of the generated octupling optical millimeter wave is investig

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