Parallel implementation of all-digital timing recovery for high-speed and real-time optical coherent receivers.
Parallel implementation of all-digital timing recovery for high-speed and real-time optical coherent receivers.
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DOI：
10.1364/oe.19.009282
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发表时间：
2011-05
期刊：
影响因子：
3.8
通讯作者：
Xian Zhou;Xue Chen
中科院分区：
文献类型：
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作者：
Xian Zhou;Xue Chen
数字相干接收机将相干检测与数字信号处理(DSP)相结合来补偿传输损伤，是未来高速光传输系统的一种很有前途的候选方案。然而，这种实时接收器支持的最大符号速率受到硬件处理速率的限制。为了应对这一困难，并行处理算法势在必行。本文在前人工作的基础上，提出了一种新的并行数字定时恢复环(PDTRL)。此外，为了扩大接收机的动态色散容忍范围，我们在PDTRL中嵌入了一个并行自适应均衡器。这种并行联合方案(PJS)可以同时完成同步、均衡和极化解复用。最后，我们演示了PDTRL和PJS允许硬件在数百MHz范围内处理112Gbit/S POLMUX-DQPSK信号。
The digital coherent receivers combine coherent detection with digital signal processing (DSP) to compensate for transmission impairments, and therefore are a promising candidate for future high-speed optical transmission system. However, the maximum symbol rate supported by such real-time receivers is limited by the processing rate of hardware. In order to cope with this difficulty, the parallel processing algorithms is imperative. In this paper, we propose a novel parallel digital timing recovery loop (PDTRL) based on our previous work. Furthermore, for increasing the dynamic dispersion tolerance range of receivers, we embed a parallel adaptive equalizer in the PDTRL. This parallel joint scheme (PJS) can be used to complete synchronization, equalization and polarization de-multiplexing simultaneously. Finally, we demonstrate that PDTRL and PJS allow the hardware to process 112 Gbit/s POLMUX-DQPSK signal at the hundreds MHz range.