OLT-centralized sampling frequency offset compensation scheme for OFDM-PON.
OLT-centralized sampling frequency offset compensation scheme for OFDM-PON.
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DOI：
10.1364/oe.25.019508
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发表时间：
2017-08
期刊：
影响因子：
3.8
通讯作者：
Ming Chen;Hui Zhou;Zhiwei Zheng;Rui Deng;Qinghui Chen;Miao Peng;Cuiwei Liu;Jing He;Lin Chen;Xionggui Tang
中科院分区：
文献类型：
--
作者：
Ming Chen;Hui Zhou;Zhiwei Zheng;Rui Deng;Qinghui Chen;Miao Peng;Cuiwei Liu;Jing He;Lin Chen;Xionggui Tang
我们提出了一种用于自适应调制 OFDM-PON 系统的光线路终端 (OLT) 集中采样频率偏移 (SFO) 补偿方案。通过使用所提出的SFO方案，OLT和多个光网络单元（ONU）之间由SFO引起的相位旋转和码间干扰（ISI）可以在OLT中集中补偿，从而降低ONU的复杂度。首先，在存在 SFO 的情况下，在强度调制和直接检测 (IMDD) OFDM 系统中确定最佳快速傅里叶变换 (FFT) 大小。然后，所提出的包括相位旋转调制（PRM）和长度自适应 OFDM 帧的 SFO 补偿方案已在具有最佳 FFT 大小的自适应调制光 OFDM 的下行链路传输中进行了实验演示。实验结果表明，可以成功补偿高达 ± 300 ppm SFO，而不会造成任何接收器性能损失。
We propose an optical line terminal (OLT)-centralized sampling frequency offset (SFO) compensation scheme for adaptively-modulated OFDM-PON systems. By using the proposed SFO scheme, the phase rotation and inter-symbol interference (ISI) caused by SFOs between OLT and multiple optical network units (ONUs) can be centrally compensated in the OLT, which reduces the complexity of ONUs. Firstly, the optimal fast Fourier transform (FFT) size is identified in the intensity-modulated and direct-detection (IMDD) OFDM system in the presence of SFO. Then, the proposed SFO compensation scheme including phase rotation modulation (PRM) and length-adaptive OFDM frame has been experimentally demonstrated in the downlink transmission of an adaptively modulated optical OFDM with the optimal FFT size. The experimental results show that up to ± 300 ppm SFO can be successfully compensated without introducing any receiver performance penalties.