期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 6, 页码 1706-1714出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3041413
关键词
Optical receivers; Passive optical networks; Optical network units; Optical transmitters; Optical sensors; Signal processing algorithms; Graphics processing units; Digital signal processing; optical coherent communications; passive optical network; softwarization
The proposed carrier phase recovery algorithm enables the software-driven optical coherent receivers and shows high performance in real-time streaming. This enhancement of disaggregated optical coherent receivers will significantly improve system flexibility and scalability.
We present a unique carrier phase recovery algorithm which permits the softwarization of optical coherent receiver digital signal processing (DSP). The proposed algorithm with decision-aided phase unwrapping overcomes the serial dependency issue that has, up to now, prevented the softwarization of optical coherent systems. Its performance is verified through extensive Monte Carlo (MC) simulations and hardware experiments on quadrature phase-shift keying (QPSK) signaling. The proposed algorithm is implemented on a general-purpose graphic processing unit (GPU) and achieves 5-Gbit/s throughput for real-time streaming signals, as well as -44.5-dBm receiver sensitivity. The softwarization of carrier phase recovery function is demonstrated for the first time; our enhancement of disaggregated optical coherent receivers will significantly improve system flexibility and scalability, towards the realization of a new access networking that exploits general purpose hardware and virtualized transport layer functions.
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