许渤,郭群,谭敏,邱昆.反馈时延对高速率光数字接收机时域均衡器影响的分析[J].光电子激光,2015,26(11):2096~2103 |
反馈时延对高速率光数字接收机时域均衡器影响的分析 |
Effect of the feedback time delay on the time-domain equalizer for high-speed optical digital receivers |
投稿时间:2015-05-10 |
DOI: |
中文关键词: 相干光通信 相干光接收机 信道均衡 时域均衡器(TDE) |
英文关键词:coherent optical communication optical coherent receiver channel eq ualization time-domain equalizer (TDE) |
基金项目:国家自然科学基金(61471088)资助项目 (电子科技大学 通信与信息工程学院,光纤传感与通信教育部重点实验室,四川 成都 611731) |
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中文摘要: |
时域均衡器(TDE)是高速率相干光数字接收机的重 要功能模块之一。从TDE的设计需要出发,本文 详细研究了误差信号的反馈时延对其收敛性能的影响,提出了一种简化的理论分析方 法,并通过对 光纤色散信道的仿真验证了方法的有效性。分析表明,当TDE使用较小的迭代步长 时,反馈时延 对TDE收敛的影响很小,且TDE在收敛后的性能与无反馈时延的理想情况相同;但 是,反馈时延的增 加,会造成TDE抽头系数的振荡,从而导致TDE的发散;同时,反馈时延会大幅降 低允许使用的最大 迭代步长,造成TDE收敛速度的降低。本文采用数值仿真的方法对光纤色散信道的TDE进 行了分析,其结果验证了上述理论分析方法的有效性,并获得了不同的反馈时延下所允许使 用的最大迭代步长,其值将随着反馈时延的增大由1.0减小至0.1。 |
英文摘要: |
Time-domain equalizer (TDE) is one of the most important modules in high-s peed coherent optical digital receivers.Starting from the implementation need,this paper analyzes and studie s the effect of the feedback delay on the convergence of the time-domain equalizers in details,pro poses a simplified theoretical analysis method,and verifies its effectiveness through simulation results with optical f iber dispersive channels.The theoretical analysis results show that for small iteration step size,the feedba ck delay has negligible effect on the equalizer′s convergence,and the equalizer′s performance after convergence ha s no difference with respect to the ideal case of no feedback delay.However,as the feedback delay increases,the f eedback delay causes the equalizer′s coefficients to oscillate and the equalizer becomes divergent as a result of large feedback delays. Meanwhile,the feedback delay will greatly reduce the maximum allowed step size for the equalizers and slow down the convergence speed.Then,we study the time-domain equaliz ers with optical fiber dispersive channels based on numerical simulations.The simulation results verify the eff ectiveness of the above theoretical method.Based on simulations,the maximum allowed step sizes at different fee dback delays are also obtained,which decrease from 1to 0.1as the feedback dela y increases. |
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