Journals >Study On Optical Communications
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2022
Volume: 48 Issue 1
15 Article(s)
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Multi-frequency Phase Laser Ranging based on Delta-Sigma Modulation
ZUO Jin-xin, ZHANG Da-wei, NIE Jun-yuan, XIONG Liang-ming... and JIANG Qian-wen|Show fewer author(s)
In order to solve the problem that the laser satellite terminal can realize the ranging function while completing the communication function, this paper designs a method based on the Delta-Sigma modulation to realize the laser phase ranging, which can integrate the functions of communication and ranging. Multi-frequencIn order to solve the problem that the laser satellite terminal can realize the ranging function while completing the communication function, this paper designs a method based on the Delta-Sigma modulation to realize the laser phase ranging, which can integrate the functions of communication and ranging. Multi-frequency point phase ranging is used to balance ranging range and ranging accuracy. Multi-frequency modulation signals are generated using high-speed digital Input and Output (I/O) ports based on Delta-Sigma modulation without any Digital-to-Analog Converter (DAC). Based on the Delta-Sigma modulation method, multiple frequency points for multi-frequency phase ranging can be generated at the same time, which is better than the traditional method of generating each single frequency point separately. Selecting the high frequency of 187.50 MHz and the low frequency of 1.50 MHz, the ranging accuracy can achieve 1 mm in the range of less than 100 m..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 1 (2022)
[in Chinese]
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 1 (2022)
Enercy Efficient Virtual Network Embedding in Data Center Optical Networks
NIE Jia-qi
To solve the energy consumption problem in Data Center Optical Networks (DCONs), an Energy Efficient Embedding algorithm based on Matching Network Resources (3E-MNR) scheme is proposed. The algorithm adopts coordinated virtual network embedding based on the concept of embedding matching resources. In the process of virTo solve the energy consumption problem in Data Center Optical Networks (DCONs), an Energy Efficient Embedding algorithm based on Matching Network Resources (3E-MNR) scheme is proposed. The algorithm adopts coordinated virtual network embedding based on the concept of embedding matching resources. In the process of virtual embedding, the resource constraints of nodes and links are taken into account at the same time. The algorithm selects the appropriate modulation format and location of regenerator and Optical Transponder (OTP) according to the link distance. The network resource with the lowest energy consumption is chosen to complete the embedding. Experimental results show that the proposed algorithm can reduce the total energy consumption and the OTP energy consumption compared with the two baseline algorithms. The performance is better when the number of virtual requests is high. The network blocking rate can be reduced on the basis of achieving the trade-off of running time..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 6 (2022)
Study on Topology Reconfiguration of Optical Interconnection Network in Data Center
YANG Wen, GUO Bing-li, YANG Hong-zhen, WANG Yan-bo... and HUANG Shan-guo|Show fewer author(s)
Aiming at preventing the network performance deterioration caused by fixed link topology connections in optically switched networks, this paper proposes and validates an interconnection and control mechanism that can automatically optimize and reconfigure network topology according to the network traffic volume. This mAiming at preventing the network performance deterioration caused by fixed link topology connections in optically switched networks, this paper proposes and validates an interconnection and control mechanism that can automatically optimize and reconfigure network topology according to the network traffic volume. This mechanism combines deep reinforcement learning with software defined network technology. Based on the real-time network performance parameters collected by the software-defined network control plane and the performance feedback of the network simulation system, the continuous training of the topology structure can be realized in the model of deep reinforcement learning. The automatic network topology reconfiguration is achieved with improved network performance. The experimental results show that for a given traffic intensity, the model trained by deep reinforcement learning can learn the topology reconstruction strategy and realize automatic selection. The optimal network topology structure can be achieved in one step, with reduced average network delay and average packet loss..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 12 (2022)
Research on the Real-time Space Laser PPM Communication System with Ultra-high Sensitivity
WANG Zhong-zhong, AO Xue-yuan, ZHANG Shen-mao, ZHANG Da-wei... and XIONG Liang-ming|Show fewer author(s)
Aiming at the low receiving power of space laser communication, a real-time space laser Pulse Position Modulation (PPM) communication system with high receiver sensitivity is designed and implemented in this paper and the transmission rate of this system is 800 Mslot/s. The experimental results show that, after using EAiming at the low receiving power of space laser communication, a real-time space laser Pulse Position Modulation (PPM) communication system with high receiver sensitivity is designed and implemented in this paper and the transmission rate of this system is 800 Mslot/s. The experimental results show that, after using Erbium Doped Fiber Amplifier (EDFA) and optical filter, under the condition of -58.3 dBm optical input, the Bit Error Rate (BER) of the system before error code correction is 1.4E-4 and the system has ultra-high receiver sensitivity..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 18 (2022)
Heterogeneous Passive Optical Network based on Power over Fiber
YANG Li-wei, YI Xiang-cheng, LIU Zhao-rui, HUANG Zi-yi... and JIA Run|Show fewer author(s)
The increasing demand of mobile network communication bandwidth requires more information in the limited bandwidth. In this paper, a novel bidirectional transmission system architecture based on Radio over Fiber Passive Optical Network (RoF-PON )system and Power over Fiber (PWoF) system is proposed, and the transmissioThe increasing demand of mobile network communication bandwidth requires more information in the limited bandwidth. In this paper, a novel bidirectional transmission system architecture based on Radio over Fiber Passive Optical Network (RoF-PON )system and Power over Fiber (PWoF) system is proposed, and the transmission performance of the hybrid system is investigated in simulation. In RoF-based mobile networks, the use of PWoF realizes the centralize power in Central Office(CO), providing a more cost effective installation method for communication networks, as well as ease of operation and maintenance. The simulation results of the system verify the reliability and feasibility of the system, which proves that the hybrid transmission system of PWoF and RoF-PON can realize the bidirectional transmission of energy and wireless signals..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 23 (2022)
Research on SCMA-VLC Receiver based on Convolutional Neural Network
ZOU Shao-qin, LAI Qi-wei, and LIN Bang-jiang
The signal distortion caused by the limited bandwidth of Light Emitting Diode (LED) and its nonlinear electro-optic conversion severely limit the transmission performance of Visible Light Communication (VLC). Traditional Message Passing Algorithm (MPA) has limited ability to resist signal nonlinear distortion in SparseThe signal distortion caused by the limited bandwidth of Light Emitting Diode (LED) and its nonlinear electro-optic conversion severely limit the transmission performance of Visible Light Communication (VLC). Traditional Message Passing Algorithm (MPA) has limited ability to resist signal nonlinear distortion in Sparse Code Multiple Access (SCMA) -VLC. In order to solve the above problems, the paper proposes a Convolutional Neural Network (CNN) receiver, which can effectively improve the anti-nonlinear distortion ability of SCMA-VLC system by feature extraction, classification and judgment of the received signal. The results show that, in the case of strong nonlinear distortion, CNN receiver has better Bit Error Rate (BER) performance than MPA receiver, which effectively expands the dynamic range of bias voltage and reduces the Signal-to-Noise Ratio (SNR) requirements of the system..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 27 (2022)
Traffic Data Synthesis Algorithm for Optical Network based on Topological Link Recognition
ZHOU Gang, WU Shu-lin, ZHANG Jiang-long, WU Xiao-hua... and ZHAO Yong-li|Show fewer author(s)
In the scenarios of traffic diagnostic analysis and prediction in optical network based on deep learning, the work of traffic data collection and storage for optical link is limited due to security and other reasons. Aiming at the problem that the amount of traffic data is too small to support deep learning training, tIn the scenarios of traffic diagnostic analysis and prediction in optical network based on deep learning, the work of traffic data collection and storage for optical link is limited due to security and other reasons. Aiming at the problem that the amount of traffic data is too small to support deep learning training, this paper proposes an optical network traffic data synthesis algorithm based on topology link recognition. The core idea is to combine the conditional generation model based on optical network topology and the data synthesis model based on optical network traffic in the framework of generative adversarial networks. The traffic data of the given optical link is synthesized in a self-supervised way. The simulation results show that the auto-correlation coefficients of the traffic data synthesized by the proposed algorithm is close to the real data, and the accuracy of the traffic prediction model based on fully connected neural network is more than 95%..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 31 (2022)
Simulation Study of Phase Conjugate Twin Wave System with Probabilistic Shaping
WANG Chen, DU Jian-xin, YI Hang, and XIA Song-ge
The Kerr nonlinear effect limits the performance of the system. A nonlinear suppression scheme combining Probability Shaping (PS) and Phase Conjugate Twin Wave (PCTW) is proposed to improve the performance of large capacity optical fiber communication system. With co-simulation of Optisystem software and Matlab softwarThe Kerr nonlinear effect limits the performance of the system. A nonlinear suppression scheme combining Probability Shaping (PS) and Phase Conjugate Twin Wave (PCTW) is proposed to improve the performance of large capacity optical fiber communication system. With co-simulation of Optisystem software and Matlab software, a PCTW-PS system is built in 16 Quadrature Amplitude Modulation (16QAM) and 64QAM modulation formats. The system consists of two kinds of PS (Huffman coding, sign inversion coding) and three dimensions PCTW (time domain, polarization domain, sub-carrier domain) to form different combinations. The simulation results show that the minimum Bit Error Rate (BER) of the scheme combining PCTW and PS can be greatly reduced. The BER of 16QAM time domain PCTW scheme is smaller than other schemes. Therefore, it can be seen that both PS and PCTW can improve system performance. The combination of PS and PCTW can further improve the performance. The 16QAM-PCTW scheme in time domain has better performance than other schemes. The simulation results also show that the BER of the in-phase component I and the quadrature component Q is different in PCTW system. Therefore, the concept of PCTW-IQ imbalance is proposed and the imbalance is especially obvious for polarization domain PCTW scheme..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 37 (2022)
Fast Sensing of Temperature and Strain along Optical Fiber based on Brillouin Scattering
GUAN Guo-fei, SONG Qing-wu, CHEN Zhi-ming, ZHONG Wei-feng, and LI Jun
To improve the extraction accuracy, the Savitzky-Golay filter is used to filter the noisy Brillouin spectra. Based on the obtained relatively accurate Brillouin frequency shift, the symmetric part of the Brillouin spectrum is selected according to the raw Brillouin spectrum. Based on the selected spectrum, the BrillouiTo improve the extraction accuracy, the Savitzky-Golay filter is used to filter the noisy Brillouin spectra. Based on the obtained relatively accurate Brillouin frequency shift, the symmetric part of the Brillouin spectrum is selected according to the raw Brillouin spectrum. Based on the selected spectrum, the Brillouin frequency shift is extracted by the parabolic fitting. Since the proposed method can obtain the Brillouin spectrum with a high degree of symmetry and more calculation time, the improved parabolic fitting method can significantly improve the accuracy of the extracted Brillouin frequency shift in real-time demonstration. This paper considers the original parabolic fitting method, the fitting method based on the pseudo-Voigt model and the improved parabolic fitting method to calculate the Brillouin frequency shift along the optical fiber. The results show that the calculation time of the modified parabola fitting method is longer than that of the original parabola fitting method, but only 1/37~1/28 of that of the fitting method based on the pseudo-Voigt model. The accuracy of the Brillouin frequency shift extracted by the former is similar to that of the latter. The proposed method is effective to realize fast sensing of temperature and strain along the optical fiber..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 45 (2022)
Channel Estimation Method of OFDM System based on Compressed Sensing
LI Gui-yong, Lü Jing-zhao, CHEN Bo, QIN Hong, and FANG Ze-sheng
Aiming at the time-domain sparsity and unknown sparsity of wireless channels, compressed sensing technology is applied to the channel estimation of Orthogonal Frequency Division Multiplexing (OFDM) system. This paper proposes a sparsity adaptive matching pursuit channel estimation algorithm. It uses the Discrete FourieAiming at the time-domain sparsity and unknown sparsity of wireless channels, compressed sensing technology is applied to the channel estimation of Orthogonal Frequency Division Multiplexing (OFDM) system. This paper proposes a sparsity adaptive matching pursuit channel estimation algorithm. It uses the Discrete Fourier Transform (DFT) channel estimation algorithm to process the noise inside and outside the cyclic prefix. The estimated channel frequency response is used to terminate the sparse iteration of the Orthogonal Matching Pursuit (OMP) algorithm and realize the sparsity adaptive signal reconstruction. At the same time, in the atomic preselection stage, the Dice coefficient criterion is used instead of the inner product criterion as the correlation measurement criterion to achieve better estimation performance. The simulation results show that the algorithm has better performance than the traditional compressed sensing channel estimation algorithm, and can improve the system’s Normalized Mean Square Error (NMSE) and Bit Error Rate (BER) performance..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 52 (2022)
Pilot Design based on Binary Code Multi-pilot Search
HUANG Hai-yan, ZHU Jun-jie, ZHENG Zhi-an, HE Ming-fang, and LIU Jian-jian
To solve the sparse channel estimation problem in Orthogonal Frequency Division Multiplexing (OFDM) systems, this paper presents a pilot design algorithm based on multi-pilot parallel searching and binary coding. Under the Mutual Incoherence Property (MIP), we consider the deterministic pilot design problem by minimiziTo solve the sparse channel estimation problem in Orthogonal Frequency Division Multiplexing (OFDM) systems, this paper presents a pilot design algorithm based on multi-pilot parallel searching and binary coding. Under the Mutual Incoherence Property (MIP), we consider the deterministic pilot design problem by minimizing the coherence of the dictionary matrix. The pilot is also required to be placed within the effective subcarrier range for more practical purposes. In this scheme, the pilot set is binary coded. In each iteration, the sequence of the binary code segment is recombined to update the approximately optimal pilot position. The update of some coding segments can change multiple pilot positions at the same time. It can increase the diversity of pilots, and reduce the complexity of computation. Experimental results show that, compared with the existing pilot optimization methods, this algorithm can find a smaller MIP measurement matrix. Therefore, the corresponding pilot mode can significantly improve the performance of channel estimation..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 58 (2022)
Improved Weighted Matching Pursuit based Channel Estimation Algorithm
Lü Zhi-guo, QI Meng, and SHAO Hong-xiang
Compressive sensing based matching pursuit algorithm can estimate the channel state information of communication system with shorter pilot sequences. It has the advantages of lower computational complexity and less number of pilots. However, the estimation accuracy is relatively low. Assigning different weights to the Compressive sensing based matching pursuit algorithm can estimate the channel state information of communication system with shorter pilot sequences. It has the advantages of lower computational complexity and less number of pilots. However, the estimation accuracy is relatively low. Assigning different weights to the estimated channel according to the estimation error can improve the estimation performance under low Signal Noise Ratio (SNR) conditions. Nevertheless, it will reduce the estimation accuracy under high SNR conditions. To address this issue, an improved weighted matching pursuit algorithm is proposed. The information of weight value is obtained by training the channel data. Adjusting the weight values adaptively with the iterations can further improve the estimation accuracy. The simulation results show that the proposed algorithm can improve the estimation performance under both low and high SNR conditions..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 63 (2022)
Implementation of Dual-fordwarding-plane Intelligent Path Selection based on SRv6+MPLS
MA Pei-yong, YANG Guang-ming, MAO Dong-feng, and LI Yu-juan
Under the background of the long-term coexistence of the 4th and 5th Generation Mobile Communication Technology (4G and 5G), as the Segment Routing (SRv6) protocol standard based on the Internet Protocol version 6 (IPv6) forwarding plane is basically mature, SRv6 and Multi Protocol Label Switching (MPLS) interoperabiliUnder the background of the long-term coexistence of the 4th and 5th Generation Mobile Communication Technology (4G and 5G), as the Segment Routing (SRv6) protocol standard based on the Internet Protocol version 6 (IPv6) forwarding plane is basically mature, SRv6 and Multi Protocol Label Switching (MPLS) interoperability and convergence in the mobile bearer network has been highlighted. This article discusses the methods on how to smoothly enable the interoperability and convergence of SRv6 and MPLS. It also proposes an efficient approach for all telecommunication operators to consult..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 67 (2022)
Research on Application of SR Protection Technology in 5G eMBB Scenarios
ZHANG Hao, LIU Guo-hui, and ZHANG Xin-quan
As the traditional 4th Generation Mobile Communication (4G) bearer network can only meet the 2G, 3G and 4G wireless service backhaul bearer, it cannot meet the higher requirements of 5G wireless backhaul on the bearer network in terms of bandwidth, delay, slicing, and reliability. It also cannot satisfy the extremely dAs the traditional 4th Generation Mobile Communication (4G) bearer network can only meet the 2G, 3G and 4G wireless service backhaul bearer, it cannot meet the higher requirements of 5G wireless backhaul on the bearer network in terms of bandwidth, delay, slicing, and reliability. It also cannot satisfy the extremely demanding real-time protection switching requirements in various 5G service scenarios, as well as the service protection and fast convergence requirements in the enhanced Mobile Broadband (eMBB) scenario. In order to solve this issue, the article proposes a Segmented Routing (SR) tunnel technology in the 5G bearer network protection application scheme. This scheme adopts the connection-oriented SR-Transport Profile (SR-TP) tunnel enhancement technology for the end-to-end protection application of the north-south services in the 5G bearer network, and the optimal SR-Best Effort (SR-BE) tunnel technology for the east-west direction protection applications for connectionless services. Experimental results show that, compared with the traditional 4G bearer network protection scheme, it can fully solve the various requirements of the 5G eMBB service scenario for the bearer network. The service protection switching is completed within 50 ms, which can fully meet the carrier-level protection switching requirements..
Study On Optical Communications
- Publication Date: Mar. 08, 2022
- Vol. 48, Issue 1, 71 (2022)
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