均衡增强相位噪声对长距离光传输系统色散补偿和载波相位恢复的影响分析
Analysis of chromatic dispersion compensation and carrier phase recovery in long-haul optical transmission system influenced by equalization enhanced phase noise
摘要：
在长距离相干光纤传输系统中，由于电子色散补偿（EDC）和激光相位噪声的相互作用，均衡增强相位噪声（EEPN）对系统的性能有很大的影响。在本文中，我们提出了一个全面的研究不同的色散（CD）补偿和载波相位恢复（CPR）的方法，在n级相移键控（n-PSK）和n级正交幅度调制（n-QAM）相干光传输系统中，考虑到EEPN的影响。考虑了四种CD补偿方法：时域均衡（TDE）、频域均衡（FDE）、最小均方（LMS）自适应均衡用于EDC，色散补偿光纤（DCF）用于光色散补偿（ODC）。同时，还介绍了三种载波相位恢复方法：一阶归一化最小均方（NLMS）算法、分块平均（BWA）算法和维特比-维特比（VV）算法。在28 G波特双极化正交相移键控（DP-QPSK）相干传输系统中进行了数值仿真，结果表明，EEPN的产生与色散补偿方法的选择有关，并且在不同的载波相位恢复方案下，EEPN的效果也有一定的差异。
英文摘要：
The performance of long-haul coherent optical fiber transmission system is significantly affected by the equalization enhanced phase noise (EEPN), due to the interaction between the electronic dispersion compensation (EDC) and the laser phase noise. In this paper, we present a comprehensive study on different chromatic dispersion (CD) compensation and carrier phase recovery (CPR) approaches, in the n-level phase shift keying (n-PSK) and the n-level quadrature amplitude modulation (n-QAM) coherent optical transmission systems, considering the impacts of EEPN. Four CD compensation methods are considered: the time-domain equalization (TDE), the frequency-domain equalization (FDE), the least mean square (LMS) adaptive equalization are applied for EDC, and the dispersion compensating fiber (DCF) is employed for optical dispersion compensation (ODC). Meanwhile, three carrier phase recovery methods are also involved: a one-tap normalized least mean square (NLMS) algorithm, a block-wise average (BWA) algorithm, and a Viterbi-Viterbi (VV) algorithm. Numerical simulations have been carried out in a 28-Gbaud dual-polarization quadrature phase shift keying (DP-QPSK) coherent transmission system, and the results indicate that the origin of EEPN depends on the choice of chromatic dispersion compensation methods, and the effects of EEPN also behave moderately different in accordance to different carrier phase recovery scenarios.
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