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

机译：基于极化复用载波的自同调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：自同调光纤链路似乎是大容量低功耗数据中心互连的理想选择。在这项工作中，已经通过级联均衡器结构实验证明了基于极化多路复用载波的自均相正交相移键控（SH-QPSK）系统。所提出的基于恒定模算法（CMA）的均衡器与决策反馈均衡器（DFE）的级联组合通过两个均衡器的均方误差（MSE）的差异提高了性能。理论框架和仿真结果证实了使用额外的DFE级时，CMA均衡器的MSE降低。仿真结果还证实，与传统的相干系统相比，在这种SH系统的情况下，独立CMA和级联均衡器的性能测量差异更大。对于使用CMA-DFE均衡器的80 km标准单模光纤（SSMF），25 Gbaud SH-QPSK系统产生的误码率（BER）为4.14 x 10（-6）。与从常用的独立CMA均衡器获得的BER相比，对于各种长度的SSMF通道，CMA-DFE均衡器的BER表现出一到两个数量级的提高。

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