Journals >Optical Communication Technology
Contents
2024
Volume: 48 Issue 6
19 Article(s)
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Underwater wireless optical communication model and its experimental research progress
YANG Shangjun, LIANG Jingyuan, and KE Xizheng
To analyze the transmission behavior of underwater wireless optical communication technology in ocean turbulence, a comprehensive summary of underwater wireless optical communication technology is conducted based on the non-line-of-sight （NLOS） transmission model, underwater channel model, and related experiments. The To analyze the transmission behavior of underwater wireless optical communication technology in ocean turbulence, a comprehensive summary of underwater wireless optical communication technology is conducted based on the non-line-of-sight （NLOS） transmission model, underwater channel model, and related experiments. The transmission characteristics of blue and green light in three different NLOS transmission models are analyzed. Combining the previous experimental results, the mechanism by which light absorption, scattering, and turbulence effects affect the underwater refractive index structure constant and probability distribution is elucidated. At the same time, the underwater optical communication experiment is summarized, and the underwater optical communication performance at different transmission rates and distances is verified by the optical system developed. The future development direction of underwater wireless optical communication is also prospected..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 1 (2024)
[in Chinese]
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 1 (2024)
Research on the influence of the raindrop terminal velocity on the spectrum of scattered light in wireless optical communication
XU Lin, HUANG Fuliang, XIE Mengqi, WANG Peng, and WANG Chen
In order to explore the impact of atmospheric disturbances on the performance of wireless optical communication （WOC） systems, the Mie scattering model is used to deeply analyze the attenuation of scattered light in rain. First, the correlation function of the raindrop terminal velocity fluctuations is solved, and thenIn order to explore the impact of atmospheric disturbances on the performance of wireless optical communication （WOC） systems, the Mie scattering model is used to deeply analyze the attenuation of scattered light in rain. First, the correlation function of the raindrop terminal velocity fluctuations is solved, and then the Wiener-Khinchin theorem is applied to calculate the power spectrum of the scattered light. A method combining Marshall-Palmer distribution with multiple raindrop terminal velocity models is creatively proposed to reveal the specific impact of raindrop terminal velocity on the received light intensity spectrum. The simulation results show that, under the same distribution of raindrop terminal velocity, as the rainfall rate increases, the attenuation of the scattered light spectrum of the four raindrop terminal velocity models also increases, but the shape of the spectrum remains basically unchanged, the attenuation of the beacon light with a wavelength of 532 nm is about 1 dB more than that of the signal light with a wavelength of 1 550 nm..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 6 (2024)
Resource allocation algorithm driven by QoS-QoE for VLC/RF heterogeneous networks
SUN Hongliang, CHEN Tongfei, and QIAN Lei
To efficiently ensure the quality of service（QoS） and quality of experience（QoE） of visible light communication/radio frequency （VLC/RF） heterogeneous networks, a QoS-QoE driven resource allocation algorithm for VLC/RF heterogeneous networks is proposed. First, the success access probability of users is analyzed based To efficiently ensure the quality of service（QoS） and quality of experience（QoE） of visible light communication/radio frequency （VLC/RF） heterogeneous networks, a QoS-QoE driven resource allocation algorithm for VLC/RF heterogeneous networks is proposed. First, the success access probability of users is analyzed based on their locations and the blocking situation of VLC links, and a switching service model is established to solve the effective capacity of the service process. The interruption uniform process （IUP） is used to describe the arrival of traffic, and the effective bandwidth of the IUP arrival is calculated. Then, the RF service rate that satisfies the delay QoS requirement is derived, and the QoE evaluation system is established based on the mapping relationship between QoS and QoE. Finally, the influence of different parameters on the resource allocation algorithm is analyzed through simulation. The simulation results show that the algorithm can ensure QoS and QoE at the same time..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 16 (2024)
DO-CAB algorithm for Bi-LSTM neural network signal recognition
HUA Guoxiang, TANG Lianhai, LI Weiwei, LI Peng, and SUN Yan
To address the problem of insufficient recognition accuracy for uplink signals in two-way automatic communication systems（TWACS）, a signal recognition algorithm based on the dandelion optimization（DO） algorithm that combines convolutional neural network（CNN） with attention mechanism（AM） and bidirectional long short-terTo address the problem of insufficient recognition accuracy for uplink signals in two-way automatic communication systems（TWACS）, a signal recognition algorithm based on the dandelion optimization（DO） algorithm that combines convolutional neural network（CNN） with attention mechanism（AM） and bidirectional long short-term memory（Bi-LSTM） neural networks is proposed, which is briefly referred to as the DO-CAB algorithm. The algorithm first adaptively extracts important features of TWACS signals using a CNN. It then optimizes the hyperparameters of the Bi-LSTM using the DO algorithm, constructs the network based on the optimized hyperparameters, and introduces an AM to assign influence weights to the inputs, improving the network algorithm for better signal recognition. The experimental results show that the proposed algorithm achieves a recognition accuracy of 92.32%, enabling efficient and accurate identification of TWACS modulated signals..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 23 (2024)
Improved generalized cross-correlation time delay estimation algorithm for sound source localization
LIANG Jiabi, SHAO Jian, LI Qun, WU Peng... and LIU Jindong|Show fewer author(s)
To address the issue of low localization accuracy of the generalized cross-correlation （GCC） algorithm in strong noise environments, an improved GCC time delay estimation algorithm is proposed. This algorithm combines the least mean squares （LMS） algorithm with the quadratic cross-correlation method to enhance the tradTo address the issue of low localization accuracy of the generalized cross-correlation （GCC） algorithm in strong noise environments, an improved GCC time delay estimation algorithm is proposed. This algorithm combines the least mean squares （LMS） algorithm with the quadratic cross-correlation method to enhance the traditional GCC algorithm, effectively suppressing the impact of noise. Additionally, spline interpolation techniques are used to significantly improve the accuracy of time delay estimation during the secondary peak detection process. The simulation results show that this algorithm reduces the error in sound source coordinate positioning from 17.7% with the traditional GCC algorithm to within 8.36%. In practical application tests, the error in sound source coordinate positioning is also significantly reduced from 42.2% with the traditional GCC algorithm to 15.4%..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 28 (2024)
SDN traffic prediction model based on adaptive spatiotemporal network
LIU Yue, ZHANG Hui, CAI Anliang, and SHEN Jianhua
To improve the accuracy of software defined networking （SDN） traffic prediction, an SDN traffic prediction model based on an adaptive spatiotemporal network is proposed. This model captures the spatial correlation of SDN traffic by using an adaptive graph convolutional neural network, captures temporal variation trendsTo improve the accuracy of software defined networking （SDN） traffic prediction, an SDN traffic prediction model based on an adaptive spatiotemporal network is proposed. This model captures the spatial correlation of SDN traffic by using an adaptive graph convolutional neural network, captures temporal variation trends through gated recurrent units, and introduces an autoregressive module in response to the highly dynamic nature of SDN traffic. The experimental results show that the proposed SDN traffic prediction method can identify more traffic features compared to existing baseline models and demonstrates superior prediction performance..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 34 (2024)
Intelligent inverse design of multi-channel on-chip micronano wavelength division demultiplexer
CHANG Leyao, WANG Huiqin, LI Jiaxiang, DONG Meitong, and YANG Haoji
To obtain ultra small and ultra dense wavelength division demultiplexer, an intelligent inverse design method for multi-channel on-chip micronano wavelength division demultiplexer is proposed. The sequential quadratic program（SQP） algorithm and finite element method（FEM） are introduced, supplemented by interpolation, sTo obtain ultra small and ultra dense wavelength division demultiplexer, an intelligent inverse design method for multi-channel on-chip micronano wavelength division demultiplexer is proposed. The sequential quadratic program（SQP） algorithm and finite element method（FEM） are introduced, supplemented by interpolation, shaping, and binarization techniques, to achieve reverse design from functional requirements to specific structures. Through this method, multiple types of wavelength division demultiplexer s have been successfully designed and experimentally validated. The experimental results show that the designed wavelength division demultiplexer performs well in terms of size, transmission efficiency, and extinction ratio..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 40 (2024)
Reliability design and testing of passive multi-channel satellite-borne fiber optic rotary joint
QIN Bo, LI Guangning, WANG Zhen, CHENG Hongxia, and WANG Chaoqi
At present, there is limited literature on the application of fiber optic rotary joint（FORJ） in the field of space. A passive multi-channel space-borne FORJ has been designed. Firstly, the potential problems and challenges that the device may face when operating in space environments are analyzed. Then, targeted reliabAt present, there is limited literature on the application of fiber optic rotary joint（FORJ） in the field of space. A passive multi-channel space-borne FORJ has been designed. Firstly, the potential problems and challenges that the device may face when operating in space environments are analyzed. Then, targeted reliability design is carried out based on mature technical solutions. Finally, the designed space-borne FORJ is experimentally verified. The experimental results indicate that the proposed passive multi-channel space-borne FORJ meets the requirements of space applications..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 46 (2024)
Relative intensity noise suppression scheme based on dual detectors
HUANG Yi, WANG Xiaxiao, XU Hongjie, and KONG Linghai
To address the issue where traditional and existing optical path suppression schemes perform well at room temperature but struggle to maintain performance across all temperature ranges, a relative intensity noise （RIN） suppression scheme based on dual detectors is proposed. This scheme uses dual detectors to separatelyTo address the issue where traditional and existing optical path suppression schemes perform well at room temperature but struggle to maintain performance across all temperature ranges, a relative intensity noise （RIN） suppression scheme based on dual detectors is proposed. This scheme uses dual detectors to separately detect optical signals passing through different paths and subtracts these signals in the circuit after synchronization to eliminate RIN, thereby improving the precision of fiber optic gyroscope. Additionally, the impact of different modulation depths on gyroscope output and potential improvements to the scheme are explored. The experimental results show that with a modulation depth of 3π/4 and the use of RIN suppression measures employing dual detectors, the scheme effectively enhances the precision of fiber optic gyroscope and meets usage requirements across all temperatures..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 52 (2024)
Impact of remote pumped amplification on the performance of long-distance large-scale optical fiber hydrophone systems
LIN Zhaopei, JIANG Lei, and WU Jiancheng
To address the challenges of array loss and transmission link loss in long-distance large-scale optical fiber hydrophone systems, which are difficult to effectively compensate using distributed fiber raman amplifiers （DFRA）, as well as the strong pump light relative intensity noise （RIN） generated during high-gain amplTo address the challenges of array loss and transmission link loss in long-distance large-scale optical fiber hydrophone systems, which are difficult to effectively compensate using distributed fiber raman amplifiers （DFRA）, as well as the strong pump light relative intensity noise （RIN） generated during high-gain amplification, a hybrid amplification technique combining remote optical pumped amplification （ROPA） with DFRA is proposed. By establishing a correlation model between the system optical signal-to-noise ratio （OSNR） and demodulated phase noise, the impact of ROPA on system OSNR and demodulated phase noise is analyzed. The experimental results show that in a 16-wavelength×8 time-division multiplexing （TDM） 100 km long-range phase-generated carrier（PGC） demodulation system, the application of ROPA reduces the system demodulated phase noise by 7.7 dB, achieving -100.4 dB@1 kHz. After optimizing the optical path structure of the remote gain unit （RGU）, the system demodulated phase noise reaches -101.5 dB@ 1 kHz..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 56 (2024)
Vibration localization based on wavelet packet denoising and feature projection for Φ-OTDR
PENG Huaimin, CHEN Hongbin, CHEN Ping, ZHANG Chao... and JIANG Helei|Show fewer author(s)
To establish a database of communication optical cable length and geographical location, a vibration localization algorithm for phase-sensitive optical time-domain reflectometer（-OTDR） based on wavelet packet denoising and feature projection is proposed. This algorithm uses -OTDR for optical cable length positioning, eTo establish a database of communication optical cable length and geographical location, a vibration localization algorithm for phase-sensitive optical time-domain reflectometer（Φ-OTDR） based on wavelet packet denoising and feature projection is proposed. This algorithm uses Φ-OTDR for optical cable length positioning, effectively addressing the issue of interference signals in actual optical cable lines. By decomposing signals with wavelet packets and applying threshold methods for denoising, specific wavelet packets are selected based on the frequency characteristics of tapping vibration signals, using their energy as feature vectors for projection, which effectively demodulates vibration signals and suppresses interference. Test results show that compared to other algorithms, the proposed algorithm has lower complexity and superior performance, successfully applied to embedded devices, achieving precise tapping localization for 20 km of optical cable..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 61 (2024)
Research on BOTDR scanning strategy for transformer winding composite fiber state monitoring
WANG Yong, MA Xun, JIA Xuchao, LIU Kai, and CHEN Yonghui
To improve the accuracy of Brillouin optical time domain reflectometry （BOTDR） in monitoring the state of transformer winding composite optical fibers, a BOTDR sweep range selection strategy is proposed. This strategy generates Brillouin spectra with different signal-to-noise ratios, sweep frequency ranges, and sweep fTo improve the accuracy of Brillouin optical time domain reflectometry （BOTDR） in monitoring the state of transformer winding composite optical fibers, a BOTDR sweep range selection strategy is proposed. This strategy generates Brillouin spectra with different signal-to-noise ratios, sweep frequency ranges, and sweep frequency asymmetry coefficients through simulation, and uses the pseudo Voigt model spectral fitting algorithm to calculate the Brillouin frequency shift. Meanwhile, the influence of three factors, namely signal-to-noise ratio, sweep frequency range, and sweep frequency asymmetry coefficient, on the accuracy of Brillouin frequency shift extraction is studied. The experimental results show that when the scanning range is symmetrical around the Brillouin frequency shift, the error reaches its minimum. In the case of a fixed number of sweep frequency points, as the sweep frequency range increases, the frequency shift error first decreases and then increases. When the sweep frequency range is one linewidth larger than the amplitude of the Brillouin frequency shift change, the error reaches its minimum value..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 68 (2024)
Trellis coding modulation constellation shaping phase conjugate twin wave scheme
ZHANG Yu, DU Jianxin, XIN Yajie, and WANG Chen
In order to further improve the performance of orthogonal frequency division multiplexing （OFDM） in dense wavelength division multiplexing（DWDM） fiber optic communication systems, a multi-dimensional trellis coding modulation（TCM） constellation shaping phase conjugate twin waves （PCTW） scheme based on hexadecimal ampliIn order to further improve the performance of orthogonal frequency division multiplexing （OFDM） in dense wavelength division multiplexing（DWDM） fiber optic communication systems, a multi-dimensional trellis coding modulation（TCM） constellation shaping phase conjugate twin waves （PCTW） scheme based on hexadecimal amplitude phase shift keying（16AP-SK） is proposed, and a multi-dimensional Huffman probability shaping（PS） method based on OFDM subcarriers is designed. By using Matlab and OptiSystem to build a simulation platform, the system performance before and after implementing constellation shaping is compared and analyzed. The simulation experiment results show that compared with the system without any constellation shaping technology, the introduction of multidimensional Huffman PS and geometric shaping strategy reduces the spectral efficiency of the system by 0.04, but significantly reduces the symbol error rate by 10.7 dB..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 75 (2024)
Optical fiber nonlinearity compensation scheme for PS system integrating triplet and complex-valued CNN
FAN Yaxuan, WANG Mingjiao, DU Lei, QIAO Jingshuai... and BAI Chenglin|Show fewer author(s)
To address the issue of nonlinear impairments in optical fiber transmission for probability shaping （PS） system, a novel optical fiber nonlinearity compensation scheme integrating triplet and complex-valued convolutional neural networks（T-CCNN） is proposed. Initially, symbols processed through linear impairment correctTo address the issue of nonlinear impairments in optical fiber transmission for probability shaping （PS） system, a novel optical fiber nonlinearity compensation scheme integrating triplet and complex-valued convolutional neural networks（T-CCNN） is proposed. Initially, symbols processed through linear impairment correction are transformed into two-dimensional triplets. These triplets are then fed into the T-CCNN for fiber nonlinearity compensation, while preserving the correlation of phase information between the real and imaginary parts. The simulation results show that at the optimal transmit power, when transmitting over 800 km with a triplet side length of 13, the gain in the Q-factor of this scheme is 1.39 dB. Moreover, when reaching the hard decision forward error correction threshold, this scheme can increase the transmission distance by approximately 180 km compared to the DBP-1StPs scheme..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 82 (2024)
Platform-based design scheme for aerospace ground optical fiber packet transport modules
ZHENG Peng, and HUANG Baihua
In order to meet the requirements of aerospace ground support systems, a platform-based design scheme for optical fiber packet transport modules is proposed. This scheme adopts a unified bearer approach based on packet switching, reuses VITA Standard 46（VPX） hardware interfaces, and extends the compatibility of standarIn order to meet the requirements of aerospace ground support systems, a platform-based design scheme for optical fiber packet transport modules is proposed. This scheme adopts a unified bearer approach based on packet switching, reuses VITA Standard 46（VPX） hardware interfaces, and extends the compatibility of standard communication protocols. Through modular software and hardware design, the scheme implements functions such as module type identification, inter-board communication, and configuration/status management. Application results show that this scheme avoids redundant development of common technologies, effectively reduces system complexity, and accelerates product development and iteration..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 89 (2024)
Research on remote upgrade method of composite ONU software image in PON system
ZHANG Chongying, HUO Huansong, CAO Yulin, TIAN Hongmei, and WU Xiaojing
In view of the fact that the international standard for passive optical network（PON） has not specified the method of remote software image upgrade for the composite optical network unit（ONU） system, a remote software image upgrade method for composite ONU is designed. The method expands upon the international standard In view of the fact that the international standard for passive optical network（PON） has not specified the method of remote software image upgrade for the composite optical network unit（ONU） system, a remote software image upgrade method for composite ONU is designed. The method expands upon the international standard while meeting its requirements, including the design of a composite image file format that can contain multiple image files and the method of creating such files, as well as the development of an ethernet-based out-of-band management and file transfer protocol （used for efficient transmission of image files）. At the same time, the method is compatible with a variety of international/domestic standard protocols. The experimental results show that show that the proposed remote upgrade method is functionally effective and highly efficient..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 94 (2024)
Development of fire-resistant optical cable for ships
SHI Xiaohua, LI Lin, LI Xiaohong, and GE Lele
To meet the high-reliability development requirements for shipboard equipment, a fire-resistant optical cable for use on ships has been developed. Firstly, the structure of the fire-resistant optical cable was designed, high-performance materials were selected, and the manufacturing process was optimized. Then, test stTo meet the high-reliability development requirements for shipboard equipment, a fire-resistant optical cable for use on ships has been developed. Firstly, the structure of the fire-resistant optical cable was designed, high-performance materials were selected, and the manufacturing process was optimized. Then, test standards and methods for the fire-resistant optical cable were proposed, specifying the detailed procedures for the 950 ℃ fire resistance test and the water spray fire resistance test. Finally, the combustion performance of the optical cable was validated through simulation. The test results show that after being exposed to a 950 ℃ flame for 90 minutes continuously, cooling for 15 minutes, and then subjected to another 950 ℃ flame for 15 minutes followed by a 15-minute water spray test, the optical transmission performance change of the cable remained at an extremely low level of less than 0.7 dB. Compared with existing products on the market, this optical cable not only increased the fire-resistant temperature by 300 ℃ but also achieved a reduction in additional fire-induced attenuation of 9 dB..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 98 (2024)
Quantum key error correction method based on parity check polar code
LUO Xianjun, LIN Zehong, and LIU Weiyue
To enhance the error correction performance of quantum key distribution （QKD）, a quantum key error correction method based on parity check polar codes is proposed. This method introduces parity check polar codes into the key error correction process and optimizes the parity check encoding strategy. It uses the parity cTo enhance the error correction performance of quantum key distribution （QKD）, a quantum key error correction method based on parity check polar codes is proposed. This method introduces parity check polar codes into the key error correction process and optimizes the parity check encoding strategy. It uses the parity check information generated by key polar encoding to complete the key error correction. The simulation results show that compared with the existing polar code-based key error correction method, this method can achieve higher error correction efficiency at the same quantum bit error rate, when the actual QKD experiment's quantum bit error rate is 0.010 48, its error correction efficiency reaches 1.34, and the secure coding rate can reach 1 319 b/s..
Optical Communication Technology
- Publication Date: Jan. 16, 2025
- Vol. 48, Issue 6, 104 (2024)
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