All-optical phase regeneration in free-space optical communication networks
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摘要: 围绕空间激光通信网络中高速数据多跳传输应用需求，针对相位调制激光链路经过空间长距离传输后信号质量劣化的问题，研究了基于相位敏感四波混频参量效应实现二进制相位调制高速激光信号的全光相位再生技术。利用Matlab软件数值分析了全光相位再生系统的影响因素，并基于OptiSystem仿真平台搭建了全光相位再生系统。结合高轨-地面站空间激光通信系统链路预算，对速率为10 Gbit/s的DPSK信号光经背靠背、相位噪声劣化以及劣化后全光相位再生处理三种传输场景进了对比分析。模拟仿真结果与数值分析结果均表明，与劣化后未经再生处理的系统相比，全光相位再生处理后的系统误码率平均优化4个数量级，信噪比提升约3 dB，表明该空间激光通信全光相位再生技术可实现相位调制信号的全光相位再生，能够有效提升空间相干激光通信系统的性能，可以应用于空间高速激光通信网络中继节点处的全光数据中继等方向。Abstract: Based on the application requirements of high-speed optical data multi-hop transmission in free-space optical communication network, and aiming at the problem that the signal quality of phase-modulated laser link after long-distance transmission in space degraded, the all-optical phase regeneration for binary phase shift keying modulated high-rate signal, based on the phase-sensitive four-wave mixing (FWM) effect in high nonlinear fiber (HNLF) was proposed. Numerical analysis with Matlab was carried out to find out the factors affecting the regeneration results. Then based on the OptiSystem simulation tool, an all-optical phase regeneration system for a 10 Gbit/s differential phase shift keying (DPSK) optical signal was constructed. Combining the link budget for geosynchronous (GEO) to optical ground station (OGS), system performance in three situations, namely back-to-back (B2B), phase-noised as well as noised-and-regenerated, were compared and analyzed. Simulation results and numerical analysis results show that compared with the system without regeneration after degradation, the bit-error-ratio (BER) of the noised-and-regenerated system improves nearly 4 orders of magnitude, while the output optical signal-to-noise-ratio (OSNR) increases nearly 3 dB. The results indicate that all-optical phase regeneration in free-space optical communication system can achieve all-optical phase regeneration of phase modulation signal. It can effectively promote the performance of spatial coherent laser communication system and can be used in the all-optical data relay of high speed free-space optical communication network relay nodes.
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