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On the long-memory filtering gain in optical high-order QAM transmission systems
Wei-Ren Peng1, Hidenori Takahashi, Takehiro Tsuritani
1KDDI R&D Laboratories Inc, 2-1-15 Ohara, Fujimino, Saitama 356-8502, Japan. pe-weiren@kddilabs.jp
Abstract:
In this paper, we verify the effectiveness of the last-stage long memory filter (LMF) in mitigating the long-memory response (LMR) of hardware, i.e. the transmitter and receiver. Based on the experimental results, we draw the following conclusions: 1) LMF can effectively mitigate the LMR impact, such as transmitter reflections, and its efficiency is more significant for high-order QAM signals. 2) Using LMF, a partially-correlated pattern exhibits similar performance to that of an uncorrelated pattern both in back-to-back and after 320-km standard single mode fiber (SSMF) transmission. Moreover, a simple solution to the computational complexity of LMF, effective-tap (ET) LMF, is proposed and demonstrated.
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