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提出一种用于单载波数字相干光通信系统的自适应色散补偿方法.在发射机端,利用强度光调制器在光信号两侧加入脉冲幅度调制导频光信号.搜索信号谱的峰值确定光信号两侧的PAM-PTs线状谱.在色散估计之前,通过其中一个PAM-PTs的频率漂移来估计激光器发射频偏,并将信号谱线沿着频率轴反向平移,补偿发射频偏,实现信号谱频域均衡.在接收机端,利用幅度脉冲调制导频信号脉冲时延估计色散大小,在色散补偿之前通过幅度脉冲调制导频信号频移补偿,并消除接收机本振频偏对频域色散补偿的影响.最终,幅度脉冲调制导频的光场信息被充分用来精确进行色散估计和色散补偿.数值仿真表明:每次色散估计的误差小于±65ps/nm,而且距离从200km到1 000km之间的平均色散估计误差小于±10ps/nm.该方法色散补偿精度高,计算量小.
An adaptive dispersion compensation method for single-carrier digital coherent optical communication system is proposed. At the transmitter side, an intensity light modulator is used to add pulse amplitude modulated pilot light signals on both sides of the optical signal. The peak of the search signal spectrum determines the light Before the dispersion estimation, the frequency offset of one of the PAM-PTs is used to estimate the frequency offset of the laser emission and to reverse the signal line along the frequency axis to compensate for the frequency offset of the transmission. Frequency domain to achieve signal spectrum equalization.At the receiver side, the amplitude of the pulse is used to estimate the dispersion of the pilot signal pulse, and the frequency offset of the pilot signal is modulated by the amplitude pulse before the dispersion compensation, and the local oscillator frequency offset In the end, the amplitude information of the pulse-modulated pilot is sufficiently used for accurate dispersion estimation and dispersion estimation.The numerical simulation shows that the error of each dispersion estimation is less than ± 65ps / nm and the distance from 200km The average dispersion estimation error to 1000km is less than ± 10ps / nm. This method has the advantages of high dispersion compensation precision and small calculation amount.