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Cascaded equalizer for polarization multiplexed carrier based self-homodyne QPSK links

机译：基于偏振多路复用载波的自同源QPSK链路的级联均衡器

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摘要

Self-homodyne fiber optic links appear to be ideal for high-capacity low-power data center interconnects. In this work, a polarization multiplexed carrier based Self-Homodyne Quadrature Phase Shift Keying (SH-QPSK) system has been experimentally demonstrated with a cascaded equalizer structure. The proposed cascade combination of a Constant Modulus Algorithm (CMA) based equalizer with a Decision Feedback Equalizer (DFE) improves the performance by virtue of the difference of the Mean Squared Error (MSE) of the two equalizers. The reduction in the MSE for a CMA equalizer, when an additional DFE stage is used, is confirmed by theoretical framework and simulation results. Simulation results also validate that the difference in the performance measurement for the standalone CMA and the cascaded equalizer is more in the case of such SH system as compared to the conventional coherent system. The 25 Gbaud SH-QPSK system results in a Bit Error Rate (BER) of 4.14 x 10(-6) for 80 km Standard Single Mode Fiber (SSMF) with the CMA-DFE equalizer. The CMA-DFE equalizer exhibits one to two orders of magnitude improvement in the BER for various lengths of SSMF channel, as compared to the BER obtained from a commonly used standalone CMA equalizer.
机译：自同源的光纤链接似乎是高容量低功耗数据中心互连的理想选择。在这项工作中，通过级联均衡器结构实验证明了一种极化多路复用载波的自我差距循环键（SH-QPSK）系统。具有判定反馈均衡器（DFE）的恒定模量算法（CMA）基于均衡器的所提出的级联组合通过两个均衡器的平均平方误差（MSE）的差异来提高性能。通过理论框架和仿真结果证实了CMA均衡器的MSE对CMA均衡器的减少。仿真结果还验证了与传统的相干系统相比，独立CMA和级联均衡器的性能测量的差异更多。 25 GBaud SH-QPSK系统可实现40公里标准单模光纤（SSMF）的4.14 x 10（-6）的误码率（BER），具有CMA-DFE均衡器。与由常用的独立CMA均衡器获得的BER相比，CMA-DFE均衡器在BER中表现出各个长度的SSMF通道的一个幅度改善。

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