为了改善基于半导体光放大器(SOA)中交叉偏振调制效应(CPM)的波长转换器的转换信号码型效应,对交叉偏振调制半导体光放大器波长转换器的工作原理进行了分析;通过讨论交叉偏振调制半导体光放大器波长转换脉冲的上升沿和下降沿的频率啁啾,结合滤波器的透过谱特性,提出了一种利用滤波器的波长正斜率边和波长负斜率边分别对正相转换信号和反相转换信号进行码型优化的方案,并进行了实验验证。在信号码率为10 Gb/s的交叉偏振调制半导体光放大器波长转换实验中,采用光带宽为0.3 nm的JDS滤波器优化转换信号的波形,基本消除了转换信号中长“1”码和长“0”码的码型效应,并将正相转换信号和反相转换信号的功率代价分别改善了3 dB以上。

In order to weaken the bit format effect of converted signal of wavelength converter based on cross-polarization-modulation in semiconductor optical amplifier (CPM-SOA), the principle of CPM-SOA wavelength converter is analyzed; and after discussing the characteristics of frequency chirping of converted signal pulses, a simple method is proposed to improve the bit format effect by using the positive or negative transmission slope of a filter to optimize the converted signal of in-phase or out-of-phase. 10 Gb/s wavelength conversion based on CPM-SOA experiment is demonstrated by using a JDS filter with 0.3 nm optical bandwidth, the bit format effect of long “1” bit and long “0” bit in converted signal is mostly eliminated, the converted signal of in-phase or out-of-phase is reshaped and their power penalties are reduced by more than 3 dB.