Characterization of LDPC-coded orbital angular momentum modes transmission and multiplexing over a 50-km fiber
Characterization of LDPC-coded orbital angular momentum modes transmission and multiplexing over a 50-km fiber
复制标题
50 公里光纤上 LDPC 编码轨道角动量模式传输和复用的表征
DOI：
10.1364/oe.24.011716
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发表时间：
2016-05-30
期刊：
影响因子：
3.8
通讯作者：
Wang, Jian
中科院分区：
文献类型：
--
作者：
Wang, Andong;Zhu, Long;Wang, Jian
光纤上的模分复用作为进一步增加光纤传输容量的潜在解决方案在过去几年中已经吸引了越来越多的关注。在本文中，我们证明了轨道角动量（OAM）模式传输超过50公里的少模光纤（FMF）的可行性。通过分析FMF中本征模的模式特性，研究了FMF中内模群差分模延迟（DMD）对长距离OAM模式传输和复用中传输容量的影响。针对长距离光纤OAM传输中大内模群DMD的影响，采用低密度奇偶校验（LDPC）码来提高系统的可靠性。通过对50 km光纤上LDPC编码的单模OAM传输性能的评估，对于1-Gbaud、2-Gbaud和5-Gbaud的正交相移键控（QPSK）信号，分别证明了>4 dB、8 dB和14 dB的显著编码增益。此外，为了验证和比较DMD在长距离光纤传输中的影响，还在实验中演示了10 km FMF上的单个OAM模式传输。最后，我们实验证明OAM复用和传输超过50公里的FMF使用LDPC编码的1-Gbaud QPSK信号，以补偿模式串扰和DMD的影响，在50公里的FMF。(C)2016美国光学学会
Mode-division multiplexing over fibers has attracted increasing attention over the last few years as a potential solution to further increase fiber transmission capacity. In this paper, we demonstrate the viability of orbital angular momentum (OAM) modes transmission over a 50-km few-mode fiber (FMF). By analyzing mode properties of eigen modes in an FMF, we study the inner mode group differential modal delay (DMD) in FMF, which may influence the transmission capacity in long-distance OAM modes transmission and multiplexing. To mitigate the impact of large inner mode group DMD in long-distance fiber-based OAM modes transmission, we use low-density parity-check (LDPC) codes to increase the system reliability. By evaluating the performance of LDPC-coded single OAM mode transmission over 50-km fiber, significant coding gains of >4 dB, 8 dB and 14 dB are demonstrated for 1-Gbaud, 2-Gbaud and 5-Gbaud quadrature phase-shift keying (QPSK) signals, respectively. Furthermore, in order to verify and compare the influence of DMD in long-distance fiber transmission, single OAM mode transmission over 10-km FMF is also demonstrated in the experiment. Finally, we experimentally demonstrate OAM multiplexing and transmission over a 50-km FMF using LDPC-coded 1-Gbaud QPSK signals to compensate the influence of mode crosstalk and DMD in the 50 km FMF. (C) 2016 Optical Society of America