介绍了一种基于参考的预均衡(RPE)技术,该技术基于自相干混频技术,可实现自相干零差检测系统中传递函数精确定性信息的测量,并且可对传输信号进行预加重处理。RPE技术可以对所有电和光的线性损失进行预补偿,电和光的线性损失包括调制器和功率放大器引起的带宽限制,以及光学前置滤波器造成的高频分量损失。RPE校准性能很大程度上取决于发射机与接收机的激光器线宽。研究了自相干零差检测系统中几种常见激光源的RPE校准性能,提出了一种能够获得传递函数精确定性信息的相位纠正算法。利用几种典型激光源,在波分复用带宽限制为25GHz、速率为32Gbit/s的偏振复用正交相移键控相干光通信系统中证实了该算法的可行性。 A reference - based pre - equalization (RPE) technique based on self - coherent mixing technique is presented to measure the accurate qualitative information of transfer function in a self - coherence homodyne detection system and to pre - emphasize the transmitted signal. The RPE technology pre-compensates for all linear losses in electricity and light. Linear losses in electricity and light include bandwidth limitations imposed by modulators and power amplifiers, as well as high-frequency component losses caused by optical pre-filters. RPE calibration performance depends largely on the laser linewidth of the transmitter and receiver. The RPE calibration performance of several common laser sources in a self-coherence homodyne detection system is studied. A phase correction algorithm that can obtain the accurate qualitative information of the transfer function is proposed. The feasibility of the proposed algorithm is demonstrated in a polarization-multiplexed quadrature phase-shift keying optical system with wavelength-division multiplexing bandwidth limited to 25GHz and rate of 32Gbit / s using several typical laser sources.