Experimental demonstration of an adaptive SFO pre-compensation scheme for OFDM-PON
Experimental demonstration of an adaptive SFO pre-compensation scheme for OFDM-PON
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DOI：
10.1016/j.optcom.2019.02.010
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发表时间：
2019-06
影响因子：
2.4
通讯作者：
Yi Liu;Jing He;Ming Chen;Jie Ma;Rui Deng;Yaoqiang Xiao;Yun Cheng
中科院分区：
文献类型：
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作者：
Yi Liu;Jing He;Ming Chen;Jie Ma;Rui Deng;Yaoqiang Xiao;Yun Cheng
针对基于正交频分复用的无源光网络(OFDMPON)，提出了一种自适应采样频偏预补偿方案。研究了不同QAM调制格式对四个光网络单元(ONU)的影响。此外，还讨论了采用自适应SFO预补偿方案的OFDMPON的循环前缀(CP)/循环后缀(CS)长度和每帧的符号个数。并研究了信噪比(SNR)对SFO估计偏差的影响。实验结果表明，采用自适应SFO预补偿方案可以避免每个ONU发生SFO引起的码间干扰。经过20公里标准单模光纤传输后，在-200~200ppm的SFO存在下，SFO估计精度可达±1ppm。在不同的SFO组合和不同的QAM调制格式下，每个ONU的信噪比代价低于1dB。
An adaptive sampling frequency offset (SFO) pre-compensation scheme is experimentally demonstrated for orthogonal frequency division multiplexing-based passive optical network (OFDM-PON). Different QAM modulation formats and SFO effects for four optical network units (ONU) are investigated in OFDM-PON. In addition, the length of cyclic prefix (CP)/cyclic suffix (CS) and the number of OFDM symbols per OFDM frame are discussed for the OFDM-PON with the adaptive SFO pre-compensation scheme. And the signal-to-noise ratio (SNR) penalty with respect to SFO estimation offset is also studied. The experimental results show that, the SFO-induced ISI in each ONU can be avoided using the adaptive SFO pre-compensation scheme. After 20 km standard single-mode fiber transmission, the SFO estimation accuracy can be within ±1 ppm in the presence of SFO ranging from -200 to 200 ppm. The SNR penalty for each ONU is below 1 dB under different SFO combinations and different QAM modulation formats.