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Journal articles on the topic 'Coherent Beam Multiplexing. Spectral Multiplexing'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Feng, Y., R. Alonso-Mori, T. R. M. Barends, et al. "Demonstration of simultaneous experiments using thin crystal multiplexing at the Linac Coherent Light Source." Journal of Synchrotron Radiation 22, no. 3 (2015): 626–33. http://dx.doi.org/10.1107/s1600577515003999.

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Multiplexing of the Linac Coherent Light Source beam was demonstrated for hard X-rays by spectral division using a near-perfect diamond thin-crystal monochromator operating in the Bragg geometry. The wavefront and coherence properties of both the reflected and transmitted beams were well preserved, thus allowing simultaneous measurements at two separate instruments. In this report, the structure determination of a prototypical protein was performed using serial femtosecond crystallography simultaneously with a femtosecond time-resolved XANES studies of photoexcited spin transition dynamics in

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2

Jiang, Cheng, Hongpei Wang, Hongmei Chen, et al. "Broadband Quantum Dot Superluminescent Diode with Simultaneous Three-State Emission." Nanomaterials 12, no. 9 (2022): 1431. http://dx.doi.org/10.3390/nano12091431.

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Semiconductor superluminescent light-emitting diodes (SLEDs) have emerged as ideal and vital broadband light sources with extensive applications, such as optical fiber-based sensors, biomedical sensing/imaging, wavelength-division multiplexing system testing and optoelectronic systems, etc. Self-assembled quantum dots (SAQDs) are very promising candidates for the realization of broadband SLED due to their intrinsic large inhomogeneous spectral broadening. Introducing excited states (ESs) emission could further increase the spectral bandwidth. However, almost all QD-based SLEDs are limited to t

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3

Zhang, Chenghong, Fangrui Qu, Peiwen Ou, Haoqi Sun, Shi He, and Bo Fu. "Recent Advances and Outlook in Single-Cavity Dual Comb Lasers." Photonics 10, no. 2 (2023): 221. http://dx.doi.org/10.3390/photonics10020221.

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Dual-comb spectroscopy as an emerging tool for spectral analysis has been investigated in a wide range of applications, including absorption spectroscopy, light detection and ranging, and nonlinear spectral imaging. Two mutually coherent combs facilitate high-precision, high-resolution, and broadband spectroscopy. Recently, dual combs generated from a single cavity have become compelling options for dual-comb spectroscopy, enabling huge simplification to measuring systems. Here, we review the progress of single-cavity dual comb lasers in recent years and summarize the distinctive advantages of

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Boutet, Sébastien, Lutz Foucar, Thomas R. M. Barends, et al. "Characterization and use of the spent beam for serial operation of LCLS." Journal of Synchrotron Radiation 22, no. 3 (2015): 634–43. http://dx.doi.org/10.1107/s1600577515004002.

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X-ray free-electron laser sources such as the Linac Coherent Light Source offer very exciting possibilities for unique research. However, beam time at such facilities is very limited and in high demand. This has led to significant efforts towards beam multiplexing of various forms. One such effort involves re-using the so-called spent beam that passes through the hole in an area detector after a weak interaction with a primary sample. This beam can be refocused into a secondary interaction region and used for a second, independent experiment operating in series. The beam profile of this refocu

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Wang, Fanggang, and Xiaodong Wang. "Coherent Optical DFT-Spread OFDM." Advances in Optical Technologies 2011 (March 31, 2011): 1–4. http://dx.doi.org/10.1155/2011/689289.

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We consider application of the discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-spread OFDM) technique to high-speed fiber optic communications. The DFT-spread OFDM is a form of single-carrier technique that possesses almost all advantages of the multicarrier OFDM technique (such as high spectral efficiency, flexible bandwidth allocation, low sampling rate, and low-complexity equalization). In particular, we consider the optical DFT-spread OFDM system with polarization division multiplexing (PDM) that employs a tone-by-tone linear minimum mean square error (MMS

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6

Sabiqun, Nahar, Redowan Mahmud Arnob Md., and Nasir Uddin Mohammad. "Empirical analysis of polarization division multiplexing-dense wavelength division multiplexing hybrid multiplexing techniques for channel capacity enhancement." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 1 (2023): 590–600. https://doi.org/10.11591/ijece.v13i1.pp590-600.

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This paper exemplifies dense wavelength division multiplexing combined with polarization division multiplexing with C-band frequency range-based single-mode fiber. In the proposed link, 32 independent channels with 16 individual wavelengths are multiplexed with two different angles of polarization. Each carrying 130 Gbps dual-polarization data with 200 GHz channel spacing claiming a net transmission rate of 4.16 Tbits/s with spectral efficiency of 69% with 20% side-mode-suppression-ratio (SMSR) and optical signal to noise ratio (OSNR) 40.7. The performance of the proposed techniques has been a

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7

Dong, Siyuan, Radhika Shiradkar, Pariksheet Nanda, and Guoan Zheng. "Spectral multiplexing and coherent-state decomposition in Fourier ptychographic imaging." Biomedical Optics Express 5, no. 6 (2014): 1757. http://dx.doi.org/10.1364/boe.5.001757.

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8

Guan, Shengnan, Jierong Cheng, Haifeng Xu, Fan Li, and Shengjiang Chang. "Terahertz metalenses for needle beam generation through coherent polarization multiplexing." Chinese Optics Letters 23, no. 2 (2025): 023605. https://doi.org/10.3788/col202523.023605.

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Muthanna, Ali Kadhim, Yousif Fattah Ali, and Alaa Sabri Atheer. "High-speed multi-channel long-haul coherent optical transmission system." TELKOMNIKA (Telecommunication, Computing, Electronics and Control) 20, no. 5 (2022): 945–54. https://doi.org/10.12928/telkomnika.v20i5.23454.

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In this work, high-speed transmission over the long-haul optical channel using orthogonal frequency division multiplexing (OFDM) was investigated. Furthermore, we recommend mixing polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) and quadrature amplitude modulation (16-QAM) to improve spectral efficiency (SE) while transmitting over a wavelength division multiplexing (WDM) system. An 800 Gb/s WDM PDM-CO-OFDM-16QAM transmission system with various channel spacing of 100 GHz, 50 GHz, and 25 GHz is examined utilizing the OptiSystem (2021) version 18.0 software package over ten

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10

Wipfler, Alexander, Tiago Buckup, and Marcus Motzkus. "Multiplexing single-beam coherent anti-stokes Raman spectroscopy with heterodyne detection." Applied Physics Letters 100, no. 7 (2012): 071102. http://dx.doi.org/10.1063/1.3680209.

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11

Kadhim, Muthanna Ali, Ali Yousif Fattah, and Atheer Alaa Sabri. "Spectral efficiency and performance improvement of coherent optical transmission system." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 290. http://dx.doi.org/10.11591/ijeecs.v27.i1.pp290-300.

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This paper presents an orthogonal frequency division multiplexing (OFDM) for a long-haul optical transmission system with high-rate transferability to alleviate dispersion effects. In addition, we suggest combining polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) to increase spectral efficiency (SE). Based on OptiSystem (2021) version 18.0" software package, a 100 Gbps single-channel PDM-CO-OFDM transmission system is investigated using different modulation formats; bipolar phase keying (BPSK), quadrature phase shift keying (QPSK), Eight-Phase-Shift Keying modulators (8-PS

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12

Kadhim, Muthanna Ali, Ali Yousif Fattah, and Atheer Alaa Sabri. "Spectral efficiency and performance improvement of coherent optical transmission system." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (2022): 290–300. https://doi.org/10.11591/ijeecs.v27.i1.pp290-300.

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This paper presents an orthogonal frequency division multiplexing (OFDM) for a long-haul optical transmission system with high-rate transferability to alleviate dispersion effects. In addition, we suggest combining polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) to increase spectral efficiency (SE). Based on OptiSystem (2021) version 18.0" software package, a 100 Gbps single-channel PDM-CO-OFDM transmission system is investigated using different modulation formats; bipolar phase keying (BPSK), quadrature phase shift keying (QPSK), Eight-Phase-Shift Keying modulators

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13

Yu, Tian-You, Marko B. Orescanin, Christopher D. Curtis, Dusan S. Zrnić, and Douglas E. Forsyth. "Beam Multiplexing Using the Phased-Array Weather Radar." Journal of Atmospheric and Oceanic Technology 24, no. 4 (2007): 616–26. http://dx.doi.org/10.1175/jtech2052.1.

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Abstract The recently installed S-band phased-array radar (PAR) at the National Weather Radar Testbed (NWRT) offers fast and flexible beam steering through electronic beam forming. This capability allows the implementation of a novel scanning strategy termed beam multiplexing (BMX), with the goal of providing fast updates of weather information with high statistical accuracy. For conventional weather radar the data acquisition time for a sector scan or a volume coverage pattern (VCP) can be reduced by increasing the antenna’s rotation rate to the extent that the pedestal allows. However, stati

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14

MYARA, M., P. SIGNORET, J. P. TOURRENC, B. ORSAL, and J. JACQUET. "1/f NOISE IN DBR TUNABLE LASERS." Fluctuation and Noise Letters 06, no. 01 (2006): L35—L43. http://dx.doi.org/10.1142/s0219477506003124.

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Tunable Lasers are key-components for Wavelength Division Multiplexing optical communication applications at 1.55μm. In this paper, we compare a rate equation model with measurements performed in order to study the Bragg section contribution in the 1/f-optical-beam noise power spectral density.

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15

Ju, Pei, Wenhui Fan, Wei Gao, et al. "Atmospheric Turbulence Effects on the Performance of Orbital Angular Momentum Multiplexed Free-Space Optical Links Using Coherent Beam Combining." Photonics 10, no. 6 (2023): 634. http://dx.doi.org/10.3390/photonics10060634.

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Atmospheric effects including absorption and scattering, and turbulence could introduce signal power loss and severe mode crosstalk for the orbital angular momentum (OAM)-based free-space optical communication (FSOC). Therefore, it is of great significance to simultaneously increase signal power and mitigate mode crosstalk. In this paper, for the OAM beam from a coherent laser array with a discrete vortex (CLA-DV) based on coherent beam combining, we investigate its propagation characteristics by employing theoretical derivation and the random phase screens simulation in atmospheric propagatio

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16

Joseph, Nisha Mary, and Puttamadappa C. "Highly Accurate Technique for CO-OFDM Channel Estimation Technique Using Extreme Learning Machine (ELM)." WSEAS TRANSACTIONS ON ELECTRONICS 14 (March 9, 2023): 7–23. http://dx.doi.org/10.37394/232017.2023.14.2.

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In wireless systems, channel estimation is considered a problematic technology, due to the fact of the difference in time between wireless channels and the noise effect. Orthogonal frequency-division multiplexing (OFDM) is a promising candidate for future optical communications and has received wide concern. The article proposed a Coherent Optical (CO) orthogonal frequency division multiplexing (OFDM) scheme, which gives a scalable and flexible solution for increasing the transmission rate, being extremely robust to chromatic dispersion as well as polarization mode dispersion. Nevertheless, bo

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17

Steinbrück, A., J. W. Choi, S. Fasold, et al. "Plasmonic heating with near infrared resonance nanodot arrays for multiplexing optofluidic applications." RSC Adv. 4, no. 106 (2014): 61898–906. http://dx.doi.org/10.1039/c4ra13312a.

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In this work, we show local laser-induced heating in fluids with gold nanodot arrays prepared by electron-beam lithography that cover resonances in the near infrared spectral range from 750 nm to 880 nm.

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18

Et. al., Keshav N,. "Millimetre Wave Communication with Spatial Division Multiplexing for 5G systems." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 7 (2021): 2609–16. http://dx.doi.org/10.17762/turcomat.v12i7.3632.

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The point of this paper is to combination of spatial division multiplexing (SDMA) along with NOMA improves the performance of the system. This paper is done with multibeam forming for performance enhancement, Analog beam forming is done along with the digital beam forming to increase the spectral efficiency and also the user count increases so that we could able to achieve high throughput. In this paper the design problems of mm wave NOMA due to beamforming is focused so that achievable data rate is high. This is due to the number of RF chains. We analyses the demanding joint plan of the inter

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19

Tan, Zicong, Tao Wang, Yuehan Xu, et al. "Polarization Division Multiplexing CV-QKD with Pilot-Aided Polarization-State Sensing." Mathematics 12, no. 22 (2024): 3599. http://dx.doi.org/10.3390/math12223599.

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Continuous-variable quantum key distribution (CV-QKD) with local local oscillator (LLO) is well-studied for its security and simplicity, but enhancing performance and interference resistance remains challenging. In this paper, we utilize polarization division multiplexing (PDM) to enhance spectral efficiency and significantly increase the key rate of the CV-QKD system. To address dynamic changes in the state of polarization (SOP) in Gaussian modulated coherent states (GMCS) signals due to polarization impairment effects, we designed a time-division multiplexing pilot scheme to sense and recove

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20

Fabrega, J.M., F.J. Vílchez, Moreolo M. Svaluto, et al. "Experimental demonstration of a metro area network with terabit-capable sliceable bit-rate-variable transceivers using directly modulated VCSELs and coherent detection." Journal of Optical Communications and Networking 15, no. 3 (2023): 103–13. https://doi.org/10.1364/JOCN.470434.

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Disaggregation in optical networks is particularly relevant to be considered for the deployment of 5G services and towards the support of 6G. Particularly in the metro area network (MAN), this is especially crucial, as is the adoption of suitable photonic technologies enabling dense integration to design a sustainable network architecture. Furthermore, to dynamically allocate the ever-increasing traffic, supporting multiterabit capacity, an optimal usage of the available resources by properly exploiting the multiple dimensions (including the spectral and spatial ones), with programmable and ad

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21

Zhu, Diling, Yiping Feng, Stanislav Stoupin, et al. "Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source." Review of Scientific Instruments 85, no. 6 (2014): 063106. http://dx.doi.org/10.1063/1.4880724.

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22

Yousif, Raghad Zuhair, Yazen Saifuldeen Almashhadani, and Basud Mohammed Rasool. "Performance Evaluation of Dispersion Compensation Fiber-based Coherent Optical OFDM-WDM for Long Haul RoF." Al-Kitab Journal for Pure Sciences 6, no. 2 (2022): 1–13. http://dx.doi.org/10.32441/kjps.06.02.p1.

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Demanding extra Bandwidth and high data rates has been meet by the integration both of wired and wireless communication systems. For that the Radio over Fiber (RoF) technology has gained a traction. In this article a Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) is proposed as the main wired system for transmitting data at high rates suffers from the polarization mode dispersion and chromatic dispersion of the optical channel which mitigates the data rates. Thus, to combat these limitations a Desperation Compensation Fiber (DCF) which adds negative attenuation to the op

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23

Monga, Himanshu, and R. S. Kaler. "Implementation and performance analysis of a new family of coherent 3-dimensional space/phase/frequency spread optical code for OCDMA networks." JOURNAL OF SOCIAL SCIENCE RESEARCH 3, no. 2 (2014): 232–39. http://dx.doi.org/10.24297/jssr.v3i2.3106.

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In his paper, we have demonstrated the feasibility of a spectrally efficient wavelength-division-multiplexing-compatible optical code-division multiple-access system using 16 phase-locked laser lines within a 40-GHz tunable window as frequency and an ultrahigh frequency resolution spectral phase encoderâ€“decoder. Coding and decoding slots using binary [0,Ï€ ] phase chips were demonstrated for four users at 5 Gb/s, and a single coded signal was separated from four copropagating signals, with bit-error rate <10 -9.

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Han, Jinliang, Jun Zhang, Xiaonan Shan, et al. "High-power narrow-linewidth diode laser based on external cavity feedback technology for Yb: YAG pumping." Japanese Journal of Applied Physics 61, no. 12 (2022): 120903. http://dx.doi.org/10.35848/1347-4065/aca247.

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Abstract An external cavity feedback structure based on volume Bragg grating is introduced to realize the spectral stabilization and linewidth narrowing of a diode laser with a central wavelength of 968.668 nm and a spectral linewidth of 0.405 nm. A diode laser source producing 1.443 kW power from an output fiber with a core diameter of 1000 μm is achieved by using a spatial beam, combining, and polarization multiplexing technologies. The external cavity feedback and fiber coupling efficiencies exceed 93% and 90%, respectively. Such a high-power narrow-linewidth diode laser can be applied in Y

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Du, Jinzhi, Weijia Cui, Bin Ba, Chunxiao Jian, and Liye Zhang. "Joint Estimation for Time Delay and Direction of Arrival in Reconfigurable Intelligent Surface with OFDM." Sensors 22, no. 18 (2022): 7083. http://dx.doi.org/10.3390/s22187083.

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Recently, the joint estimation for time delay (TD) and direction of arrival (DOA) has suffered from the high complexity of processing multi-dimensional signal models and the ineffectiveness of correlated/coherent signals. In order to improve this situation, a joint estimation method using orthogonal frequency division multiplexing (OFDM) and a uniform planar array composed of reconfigurable intelligent surface (RIS) is proposed. First, the time-domain coding function of the RIS is combined with the multi-carrier characteristic of the OFDM signal to construct the coded channel frequency respons

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Giacoumidis, Elias, Yi Lin, Jinlong Wei, Ivan Aldaya, Athanasios Tsokanos, and Liam Barry. "Harnessing machine learning for fiber-induced nonlinearity mitigation in long-haul coherent optical OFDM." Future Internet 11, no. 1 (2018): 2. http://dx.doi.org/10.3390/fi11010002.

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Coherent optical orthogonal frequency division multiplexing (CO-OFDM) has attracted a lot of interest in optical fiber communications due to its simplified digital signal processing (DSP) units, high spectral-efficiency, flexibility, and tolerance to linear impairments. However, CO-OFDM’s high peak-to-average power ratio imposes high vulnerability to fiber-induced non-linearities. DSP-based machine learning has been considered as a promising approach for fiber non-linearity compensation without sacrificing computational complexity. In this paper, we review the existing machine learning approac

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Shi, Chengzhi, Marc Dubois, Yuan Wang, and Xiang Zhang. "High-speed acoustic communication by multiplexing orbital angular momentum." Proceedings of the National Academy of Sciences 114, no. 28 (2017): 7250–53. http://dx.doi.org/10.1073/pnas.1704450114.

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Long-range acoustic communication is crucial to underwater applications such as collection of scientific data from benthic stations, ocean geology, and remote control of off-shore industrial activities. However, the transmission rate of acoustic communication is always limited by the narrow-frequency bandwidth of the acoustic waves because of the large attenuation for high-frequency sound in water. Here, we demonstrate a high-throughput communication approach using the orbital angular momentum (OAM) of acoustic vortex beams with one order enhancement of the data transmission rate at a single f

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Ahmed, Bashar M., and Raad S. Fyath. "Effect of Fiber Nonlinearity on the Performance of WDM Dual-Polarization Coherent Optical OFDM Systems." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 13, no. 9 (2014): 4943–64. http://dx.doi.org/10.24297/ijct.v13i9.2397.

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In recent years, there is increasing interest in using dual-polarization (DP) technique to enable future systems with at least 100 Gb/s rate per channel to operate over existing optical networks. The performance of these advanced systems can be enhanced further by using coherent optical orthogonal multiplexing (CO-OFDM) technique which offers high spectral efficiency and outstanding tolerance of fiber dispersion. This paper addresses the effect of fiber nonlinear optics on the performance of dual-polarization wavelength-division multiplexing (WDM) CO-OFDM systems operating with 100 Gb/s per ch

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Ali, Babar, Ghulam Murtaza, Hafiz Muhammad Bilal, Tariq Mahmood, Muhammad Rashid, and Zaib Ullah. "Optical Frequency Comb-Based 256-QAM WDM Coherent System with Digital Signal Processing Algorithm." Chips 4, no. 2 (2025): 16. https://doi.org/10.3390/chips4020016.

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This work presents a cost-effective optical frequency comb generator (CEOFCG) solution for generating multiple, equally spaced carriers in wavelength-division-multiplexing coherent optical fiber communication systems (WDM-COFCS). It enables the replacement of multiple laser sources with a single continuous-wave laser, eliminating the need for additional amplification and filtering setups. The CEOFCG provides stable multicarrier spacing, broad phase coherence, and compatibility with advanced modulation formats, enhancing the performance of WDM-COFCS. Digital signal processing (DSP) techniques,

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30

Zhang, Zhen, Emma Snively, Valery Dolgashev, and Zhirong Huang. "Fast and flexible control of beam longitudinal phase space for high-repetition-rate x-ray free-electron lasers." Review of Scientific Instruments 94, no. 2 (2023): 024706. http://dx.doi.org/10.1063/5.0135658.

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The wide-ranging requirements for the photon properties from multiple beamlines in superconducting based free-electron lasers (FELs) demand more challenging beam manipulation techniques. Shot-by-shot control of electron beam bunch length and peak current at high repetition rate up to megahertz is highly desired. In this paper, we present a comprehensive study of a method based on a 2-m-long normal conducting radio-frequency cavity to achieve fast and flexible control of beam compression and realize the full potential of the facility, including theoretical analysis, beam dynamics simulations, a

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Zhang, Jun, Hangyu Peng, Jingbo Wang, et al. "Dense spectral beam combining of quantum cascade lasers by multiplexing a pair of blazed gratings." Optics Express 30, no. 2 (2022): 966. http://dx.doi.org/10.1364/oe.446124.

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Allen, B., D. Simmons, T. D. Drysdale, and J. Coon. "Performance analysis of an orbital angular momentum multiplexed amplify-and-forward radio relay chain with inter-modal crosstalk." Royal Society Open Science 6, no. 1 (2019): 181063. http://dx.doi.org/10.1098/rsos.181063.

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The end-to-end spectral efficiency and bit error rate (BER) of an amplify-and-forward (AF) radio relay chain employing orbital angular momentum (OAM) multiplexing is presented. The inherent divergence of a beam carrying OAM is overcome by means of a lens. Modelled and measured inter-modal crosstalk levels are incorporated into the analysis. The results show that an end-to-end spectral efficiency of up to 8 bits s −1 Hz −1 is achievable using four OAM modes to multiplex four parallel data streams over 20 hops, provided that the detrimental effects of inter-modal crosstalk are mitigated. The spe

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Anand, Vijayakumar, Tomas Katkus, and Saulius Juodkazis. "Randomly Multiplexed Diffractive Lens and Axicon for Spatial and Spectral Imaging." Micromachines 11, no. 4 (2020): 437. http://dx.doi.org/10.3390/mi11040437.

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A new hybrid diffractive optical element (HDOE) was designed by randomly multiplexing an axicon and a Fresnel zone lens. The HDOE generates two mutually coherent waves, namely a conical wave and a spherical wave, for every on-axis point object in the object space. The resulting self-interference intensity distribution is recorded as the point spread function. A library of point spread functions are recorded in terms of the different locations and wavelengths of the on-axis point objects in the object space. A complicated object illuminated by a spatially incoherent multi-wavelength source gene

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Zhang, Donghui. "Signal Processing Methods in MIMO Communication Systems." Highlights in Science, Engineering and Technology 124 (February 18, 2025): 326–31. https://doi.org/10.54097/dy7y1t24.

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This paper delves into the latest advancements and hurdles in Multi-Input Multi-Output (MIMO) technology, particularly in the realm of 5G and future networks. Initially, it examines the fusion of Non-Orthogonal Multiple Access (NOMA) with MIMO, emphasizing its crucial role in user grouping, beam steering, and power distribution strategies. Subsequently, the research explores progress in massive MIMO systems, concentrating on signal processing methods that improve spectral efficiency and system performance in sparse scattering contexts. The paper also reviews sophisticated signal processing app

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Stoupin, S., S. A. Terentyev, V. D. Blank, et al. "All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source." Journal of Applied Crystallography 47, no. 4 (2014): 1329–36. http://dx.doi.org/10.1107/s1600576714013028.

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A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal, with a thickness of ∼100 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a reg

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Gorkunov, Maxim V., Artur R. Geivandov, Alena V. Mamonova, et al. "Non-Mechanical Multiplexed Beam-Steering Elements Based on Double-Sided Liquid Crystal Metasurfaces." Photonics 9, no. 12 (2022): 986. http://dx.doi.org/10.3390/photonics9120986.

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We propose, optimize, fabricate and test beam-steering elements based on double-sided liquid-crystal (LC) metasurfaces allowing for diffractive and spectral multiplexing, and thus covering three different beam deflection directions each. While straightforward parallel design requires one diffractive beam-steering element per a direction determined by Bragg’s law, double-sided LC-metasurfaces are remarkably flexible and allow optimization for three operation modes at different applied voltages: zero-voltage mode with dominant +1 order red light and +2 order blue light diffraction; intermediate

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Li, Xuan, Junce Shi, Long Wei, et al. "Research on Silicon-Substrate-Integrated Widely Tunable, Narrow Linewidth External Cavity Lasers." Crystals 12, no. 5 (2022): 674. http://dx.doi.org/10.3390/cryst12050674.

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Widely tunable, narrow linewidth external cavity lasers on silicon substrates have many important applications, such as white-light interferometry, wavelength division multiplexing systems, coherent optical communication, and optical fiber sensor technology. Wide tuning range, high laser output power, single mode, stable spectral output, and high side-mode suppression ratio external cavity lasers have attracted much attention for their merits. In this paper, two main device-integrated structures for achieving widely tunable, narrow linewidth external cavity lasers on silicon substrates are rev

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Liao, Chien-Sheng, Pu Wang, Ping Wang, et al. "Spectrometer-free vibrational imaging by retrieving stimulated Raman signal from highly scattered photons." Science Advances 1, no. 9 (2015): e1500738. http://dx.doi.org/10.1126/sciadv.1500738.

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In vivo vibrational spectroscopic imaging is inhibited by relatively slow spectral acquisition on the second scale and low photon collection efficiency for a highly scattering system. Recently developed multiplex coherent anti-Stokes Raman scattering and stimulated Raman scattering techniques have improved the spectral acquisition time down to microsecond scale. These methods using a spectrometer setting are not suitable for turbid systems in which nearly all photons are scattered. We demonstrate vibrational imaging by spatial frequency multiplexing of incident photons and single photodiode de

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Strelnikov, Anton P., Alexey S. Volkov, and Alexey V. Solodkov. "THE DEVELOPMENT OF LOW-RANK SPATIAL PRECODING VECTORS IN TIME DOMAIN." T-Comm 17, no. 9 (2023): 28–37. http://dx.doi.org/10.36724/2072-8735-2023-17-9-28-37.

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In this paper we consider the alternative way of development of spatial beamforming processing algorithm in time-domain under low-rank Massive-MIMO systems. It is well-known, that the telecommunication systems, which based on spatial multiplexing technology achieve following advantages: increase the spectral efficiency in many times due to spatial channel multiplexing gain, the beamforming technology implementation (effective energy distribution in the space). The organization of spatial filtering (the beamforming vector processing) – one of the most significant tools in MIMO-OFDM multiplexing

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Stepanov, Ivan V., Denis M. Fatkhiev, Vladimir S. Lyubopytov, et al. "Wavelength-Tunable Vortex Beam Emitter Based on Silicon Micro-Ring with PN Depletion Diode." Sensors 22, no. 3 (2022): 929. http://dx.doi.org/10.3390/s22030929.

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Herein we propose a design of a wavelength-tunable integrated vortex beam emitter based on the silicon-on-insulator platform. The emitter is implemented using a PN-depletion diode inside a microring resonator with the emitting hole grating that was used to produce a vortex beam. The resonance wavelengths can be shifted due to the refractive index change associated with the free plasma dispersion effect. Obtained numerical modeling results confirm the efficiency of the proposed approach, providing a resonance wavelength shift while maintaining the required topological charge of the emitted vort

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

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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

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Li, Xiangzhi, Weijia Cui, Haiyun Xu, Bin Ba, and Yankui Zhang. "A Novel Method for DOA and Time Delay Joint Estimation in Multipath OFDM Environment." International Journal of Antennas and Propagation 2020 (January 30, 2020): 1–11. http://dx.doi.org/10.1155/2020/3952175.

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Joint time delay and direction of arrival estimation based on uniform linear arrays in Orthogonal Frequency Division Multiplexing (OFDM) systems has to face the problems posed by coherent multipath environments and high computational complexity. In this paper, a novel fast method is proposed to achieve a joint direction-of-arrival (DOA) and time-dealy (TD) estimation of multipath OFDM signals by fully using space-frequency characteristics. Firstly, we construct an extended virtual array by combining the array structure and frequency-domain information. Then, we calculate the extended channel f

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Liu, Ning, Xuewen Wang, Jinpeng Yuan, Liantuan Xiao, Suotang Jia, and Lirong Wang. "Manipulation of the orbital angular momentum via four-wave mixing in Rb vapor." Laser Physics Letters 20, no. 3 (2023): 035204. http://dx.doi.org/10.1088/1612-202x/acb43d.

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Abstract The manipulation of the orbital angular momentum (OAM) contributes to understand the OAM multiplexing, is significant in free-space optical communication and information processing. We theoretically simulate and experimentally demonstrate the regularity of the OAM transfer, including the angular and radial modes, of Laguerre–Gaussian beam via four-wave mixing process in 85Rb vapor. The 420 nm coherent blue light output field inherits the phase characteristic of 780 nm and 776 nm beams with different OAM modes. The output field OAM modes show the transfer as a typical arithmetic operat

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Elbakry, Mohamed S., Sherief Hashima, and Basem M. El Halawany. "Symbol time compression for OFDM spectral efficiency in visible light communication." Journal of Physics: Conference Series 2850, no. 1 (2024): 012010. http://dx.doi.org/10.1088/1742-6596/2850/1/012010.

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Abstract In recent times, the visible light communication (VLC) schemes show high data rates capabilities. In intensity modulation and direct detection (IM-DD), the intensity of the light beam from a laser or LED is modulated directly by information bits, without requiring phase information. Various orthogonal frequency division multiplexing (OFDM) forms can be used to address channel distortions for IM/DD channels in VLC system. Those forms include asymmetrically clipped optical OFDM (ACO-OFDM) and direct current biased optical OFDM (DCO-OFDM). However, both DCO-OFDM and ACO-OFDM systems suff

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Zang, Zihan, Zhi Li, Yi Luo, et al. "Ultrafast parallel single-pixel LiDAR with all-optical spectro-temporal encoding." APL Photonics 7, no. 4 (2022): 046102. http://dx.doi.org/10.1063/5.0071885.

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Light detection and ranging (LiDAR) with scanning beam has been widely used in autonomous driving and large-scale manufacturing, where the fast-changing scene is of great interest. However, the acquisition rate of current LiDAR is limited by beam steering speed and the round-trip delay, hindering the development of video-rate LiDAR. Here, we uniquely combine all-optical encoders with wavelength-division multiplexing devices to implement spectro-temporal encoding on the illumination light. Parallel detection and fast spectral scanning can be achieved with only one laser and one single photodete

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Bernal, M.-P., G. W. Burr, H. Coufal, et al. "Holographic-Data-Storage Materials." MRS Bulletin 21, no. 9 (1996): 51–60. http://dx.doi.org/10.1557/s088376940003637x.

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In holographic data storage, a photo-sensitive medium is exposed to the interference pattern that is generated when an object beam, with an input data page encoded in the spatial profile of the beam, is intersected by a second, coherent laser beam. The photosensitive medium replicates these interference fringes as a change in optical absorption, refractive index, or thickness. Data are retrieved from the medium by exposing it to light from just one of the beams, which is then diffracted from the stored fringe pattern to reconstruct the other beam, including all the information that had been in

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Verma, Deepika, Rahul Bosu, and Shanthi Prince. "Performance Investigation of WDM based hybrid RF-FSO Link with Unmanned Aerial Vehicles based Optical Relays." Journal of Physics: Conference Series 2335, no. 1 (2022): 012015. http://dx.doi.org/10.1088/1742-6596/2335/1/012015.

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Abstract The paper presents the design of wavelength division multiplexing (WDM) based hybrid radio frequency-free space optical communication (RF-FSOC) system for high data rate transmission in the scenarios where the direct line-of-sight (LOS) view between the end-to-end communication nodes is unavailable. As such, a simulation model of unmanned aerial vehicle (UAV) based parallel relaying mechanism incorporating amplify and reflection (AR) technique is presented for establishing a point-to-point FSOC link between UAV and ground base station. Furthermore, the power spectral characteristics o

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Zhao, Peiqian, V. Coudé Du Foresto, J. M. Mariotti, P. Lena, and Bifang Zhou. "Stellar Diameter Measurements with Fiber Optic Double Fourier Interferometry—Experimental Study." Symposium - International Astronomical Union 166 (1995): 362. http://dx.doi.org/10.1017/s0074180900228453.

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Long baseline optical interferometry has been successfully employed to measure the diameters of stars. In this technique, bandwidth smearing can affect the measurement accuracy. These bandwidth smearing effects can be, to some extent, eliminated by dividing the whole observing spectral band into sub-bands and calculating the star's diameter based on the visibilities and spatial frequencies at the corresponding sub-bands. In the visible range, dividing the whole spectral band can be implemented by introducing a spectrograph, while in the IR domain, this operation can be performed efficiently wi

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Rahmani, Mohamed, Abdelhamid Cherifi, Abdullah S. Karar, Ghoutia Naima Sabri, and Boubakar S. Bouazza. "Contribution of New Three-Dimensional Code Based on the VWZCC Code Extension in Eliminating Multiple Access Interference in Optical CDMA Networks." Photonics 9, no. 5 (2022): 310. http://dx.doi.org/10.3390/photonics9050310.

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In order to solve the problem of one-dimensional code length, two-dimensional code spatial length, phase induced intensity noise PIIN effect, improved system capacity, and increased the number of simultaneous users, a new three-dimensional spectral/time/spatial variable weight zero cross correlation code for non-coherent spectral amplitude coding-optical code division multiple access (3D-VWZCC-SAC-OCDMA) is proposed in this paper. Its construction is based on a one-dimensional (1D) spectral sequence and two-dimensional (2D) temporal/spatial sequences, which are characterized by the property of

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Elsayed, Ebrahim E. "Investigations on OFDM UAV-based free-space optical transmission system with scintillation mitigation for optical wireless communication-to-ground links in atmospheric turbulence." Optical and Quantum Electronics 56, no. 5 (2024). http://dx.doi.org/10.1007/s11082-024-06692-1.

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AbstractThe potential integration of unmanned aerial vehicles (UAVs) with free space optical (FSO) communication systems stands as a promising innovation in the realm of wireless network infrastructures. This study presents a comprehensive investigation into the application of orthogonal frequency division multiplexing (OFDM) in conjunction with UAV-based FSO technology, with a specific focus on establishing robust wireless communication links to ground sites within the evolving landscape of 5G networks. The research introduces a pioneering 4-level quadrature amplitude modulation (4-QAM)-OFDM-

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