空间激光通信网络中的全光数据合路技术研究

Research on the all-optical data aggregation technology in the space laser communication network

摘要:

针对空间激光通信网络接入节点多路激光链路传输需求，基于高非线性光纤中四波混频参量效应，并结合色散控制，开展全光合路处理技术研究。采用VPI 10.0模拟平台构建了时间透镜全光合路系统，验证了4路速率为10 Gbps的差分相移键控DPSK（Differential Phase Shift Keying）信号光以及通断键控调制OOK（On-Off Keying）和DPSK混合制式信号光的全光合路可行性，并对全光合路技术实现中色散、光功率等关键参数对系统性能的影响进行了分析，为实际系统的设计和应用提供数据支撑。所提出的全光合路技术具有数据处理带宽大、通信制式兼容且系统复杂度低等优点，可有效降低空间激光通信网络的资源需求与载荷成本，为下一代空间激光骨干网的发展与全面应用提供有效技术支撑。

Abstract:

Aiming at the multi-channel laser link transmission requirements of access node in space laser communication network, the all-optical data aggregation, based on the parametric four-wave mixing (FWM) effect in the high nonlinear fiber combing with dispersion controlling, is proposed and analyzed. The all-optical processing system is constructed on the VPI 10.0 simulation platform and the feasibility analysis is carried out. Four DPSK modulated optical links at data-rate of 10?Gbps each are optically aggregated into one 40 Gbps link. The aggregation of mixed optical links, with OOK and DPSK modulation types, is also validated. Then the fiber dispersion and optical power, which are crucial in the aggregation performance, are separately varied and the corresponding system performance such as eye-pattern diagram and bit error ratio are analyzed. The obtained results can reliably support the practical system design and application. The proposed system in this paper owns several application advantages such as broader bandwidth, modulation transparency and lower complexity. Thus, it is helpful in the cost and space resource demand reduction, and can technically support the comprehensive development and application of the next generation space laser backbone network.