CO-OFDM系统中利用阈值功率点改进的后向传输补偿算法

发布时间：2018-06-19 23:57

本文选题：光纤通信 + 后向传输(BP)　；参考：《光电子.激光》2014年05期

【摘要】：采用后向传输(BP)补偿算法补偿相干光正交频分复用(CO-OFDM)通信系统的非线性损伤是一种具有应用前景的方法。本文针对后向传输(BP)补偿算法计算复杂度高的问题,根据相干光正交频分复用(CO-OFDM)系统中非线性损伤与光功率的关系,通过选取合适的阈值功率点降低BP补偿算法的高计算复杂度。仿真结果表明,提出的方法可以大大降低BP补偿算法的计算复杂度,同时克服了传统算法过补偿的缺点,系统性能也得到提升。在100Gbit/s的CO-OFDM系统中,采用衰减因子为0.2dB/km的零色散光纤,信号传输3 200km(32×100km),光信噪比(OSNR)为16dB时,在选取合适的阈值功率点后,所需的BP补偿步骤数目由传统算法N=61降低为N=13,计算复杂度仅为原来的13/61。此外,采用改进的BP补偿算法补偿之后,系统的Q因子增加了0.204dB。
[Abstract]:It is a promising method to compensate the nonlinear damage of coherent optical orthogonal frequency division multiplexing (CO-OFDM) communication system with backward transmission BP- compensation algorithm. In order to solve the problem of high computational complexity of backward transmission BP-based compensation algorithm, the relationship between nonlinear damage and optical power in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is discussed in this paper. The high computational complexity of BP compensation algorithm is reduced by selecting appropriate threshold power points. The simulation results show that the proposed method can greatly reduce the computational complexity of the BP compensation algorithm, and overcome the shortcomings of the traditional algorithm, and the system performance is also improved. In a 100Gbit / s CO-OFDM system, when the attenuation factor is 0.2 dB / km, the signal to noise ratio is 16 dB, and the signal to noise ratio is 16 dB, when the attenuation factor is 0.2 dB / km, the signal to noise ratio (SNR) is 16 dB, when the appropriate threshold power point is selected, The number of BP compensation steps required is reduced from the traditional algorithm NX61 to NC13, and the computational complexity is only 13 / 61. In addition, after the improved BP compensation algorithm is used, the Q factor of the system is increased by 0.204 dB.
【作者单位】：河北工业大学信息工程学院;吉林大学通信工程学院;
【基金】：国家自然科学基金(61077054) 河北省自然科学基金(F2014202036) 天津市高等学校科技发展基金(20120715) 河北省高层次人才(C2013001048)资助项目
【分类号】：TN929.1

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