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Digital Coherent Receivers for Long-Reach Optical Access Networks

机译:远程光接入网的数字相干接收机

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摘要

The relative merits of coherent-enabled optical access network architectures are explored, with a focus on achievable capacity, reach and split ratio. We review the progress in implementing the particular case of the ultra dense wavelength division multiplexed (UDWDM) passive optical network (PON), and discuss some challenges and solutions encountered. The applicability of digital signal processing (DSP) to coherent receivers in PONs is shown through the design and implementation of parallelized, low-complexity application-specific digital filters. In this work, we focus on mitigating the impact of local oscillator laser (LO) relative intensity noise (RIN) on receiver sensitivity, and propose an algorithm which compensates for this impairment. This phenomenon is investigated theoretically and then experimentally by evaluating the sensitivity of a coherent receiver incorporating different tunable light sources; a low-RIN external cavity laser (ECL) and a monolithically integrated digital supermode distributed Bragg reflector (DS-DBR) laser. It is shown that the RIN of the signal laser does not significantly contribute to the degradation of the receiver sensitivity. Finally, a 10 Gbit/s coherent PON is demonstrated using a DS-DBR laser as the LO laser. It is found that a receiver sensitivity of ${-}38.8$ dBm is achievable assuming the use of hard-decision forward error correction.
机译:探索了相干使能的光接入网络体系结构的相对优点,重点是可实现的容量,到达率和分流比。我们回顾了实现超高密度波分复用(UDWDM)无源光网络(PON)的特殊情况的进展,并讨论了所遇到的一些挑战和解决方案。通过并行化,低复杂度的专用数字滤波器的设计和实现,显示了数字信号处理(DSP)在PON中对相干接收器的适用性。在这项工作中,我们专注于减轻本地振荡器激光(LO)相对强度噪声(RIN)对接收器灵敏度的影响,并提出了一种可以弥补这种损害的算法。从理论上然后通过实验评估这种现象,方法是评估装有不同可调光源的相干接收机的灵敏度。低RIN外腔激光器(ECL)和单片集成数字超模分布式布拉格反射器(DS-DBR)激光器。结果表明,信号激光器的RIN不会显着影响接收器的灵敏度。最后,使用DS-DBR激光器作为LO激光器演示了10 Gbit / s的相干PON。已经发现,假设使用硬判决前向纠错,则可以达到$ {-} 38.8 $ dBm的接收机灵敏度。

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