基于光梳状波的相干光正交频分复用-无源光网系统的算法

发布时间：2018-07-01 21:42

本文选题：光通信 + 正交频分复用　；参考：《光学学报》2017年07期

【摘要】：研究了基于光梳状波的正交频分复用-无源光网(OFDM-PON)下行相干检测实验系统的结构和数字信号处理算法,采用多波长的光梳状波发生器作为光线路终端光源,其中一个波长作为传输OFDM信号的信号光,相邻的光波长作为本振光。基于该系统,光网络单元端的相干接收可以实现光相位噪声抵消。由于没有载波偏移和光相位噪声,数字信号处理过程被简化。比较了导频辅助(PA)算法、最大似然(ML)算法和PA+ML算法3种相位估计算法的性能。研究结果表明,PA+ML算法能获得更好的性能,可以将导频子载波的数目减少至2,并且接收机灵敏度可提高至-30dBm。该OFDM-PON系统的硬件和软件设计有望成为下一代光接入网络的解决方案。
[Abstract]:The structure and digital signal processing algorithm of the coherent detection system for orthogonal frequency division multiplexing (OFDM-PON) downlink based on optical comb wave (OFDM-PON) are studied. A multi-wavelength optical comb wave generator is used as the terminal light source of optical line. One wavelength is used as signal light to transmit OFDM signal, and the adjacent wavelength is used as local oscillator. Based on this system, optical phase noise cancellation can be realized by coherent reception at the cell end of optical network. Without carrier offset and optical phase noise, the process of digital signal processing is simplified. The performance of pilot-assisted (PA) algorithm, maximum likelihood (ML) algorithm and PAML algorithm are compared. The results show that the PA ML algorithm can achieve better performance, can reduce the number of pilot subcarriers to 2, and the receiver sensitivity can be increased to -30 dBm. The hardware and software design of the OFDM-PON system is expected to be the solution of the next generation optical access network.
【作者单位】：上海大学特种光纤与光接入网重点实验室;
【基金】：国家自然科学基金国际合作项目(61420106011);国家自然科学基金(61132004,61275073) 上海市科委项目(16511104100,16YF1403900,15511105400,15530500600)
【分类号】：TN929.1

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