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Nonlinear distortion estimation in dual-carrier PM-QPSK signals for uncompensated fiber links

机译：无补偿光纤链路的双载波PM-QPSK信号中的非线性失真估计

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摘要

Kerr nonlinearity is particularly detrimental in coherent optical communications over long-haul, sub-sea and transatlantic links. The correct and accurate determination of the penalty due to fiber nonlinearity is critical for estimating the link capacity and optical signal to noise ratio margins. Two distinct approaches for calculating the power in the nonlinear field are proposed. The first approach utilizes the nonlinear variance at the decision gate after coherent detection, while the second attempts to extract the electrical field of the nonlinear interference noise. Subsequently, the power spectral density of the nonlinear interference noise is integrated to estimate the nonlinear power within a pre-defined signal-to-nose ratio criterion. Based on the assumptions in this study, a temporal resolution of 16 samples per symbol or (6.25 ps) is required to achieve a signal-to-noise ratio sensitivity of 40 dB on the nonlinear power estimate for a 10 Gbaud signal. Furthermore, a minimum pattern length of 128 symbols is required to obtain an adequate estimate of the nonlinear noise power within 30 dB signal-to-noise ratio for two adjacent wavelength-division-multiplexed (WDM) channels. The influence of the pulse shaping roll-off factor and number of WDM channels on the required pattern length and the nonlinear power estimation is also investigated.
机译：Kerr非线性在长距离，海底和跨大西洋链路的相干光通信中特别有害。对光纤非线性造成的损失进行正确而准确的确定对于估算链路容量和光信噪比裕度至关重要。提出了两种在非线性场中计算功率的不同方法。第一种方法在相干检测之后利用决策门处的非线性方差，而第二种方法则尝试提取非线性干扰噪声的电场。随后，对非线性干扰噪声的功率谱密度进行积分，以在预定的信噪比标准内估算非线性功率。根据这项研究中的假设，对于10 Gbaud信号的非线性功率估计，需要达到每个符号16个样本的时间分辨率或（6.25 ps）的时间分辨率，以实现40 dB的信噪比灵敏度。此外，对于两个相邻的波分多路复用（WDM）通道，需要获得最小符号长度为128个符号，才能在30 dB信噪比范围内获得对非线性噪声功率的充分估计。还研究了脉冲整形滚降因子和WDM通道数对所需图案长度和非线性功率估计的影响。

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