实验验证了基于超连续谱(SC)和超结构光纤光栅(SSFBG)的波分复用/光码分复用(WDM/OCDM)混合系统, 超结构光纤光栅实现了对超连续谱光源的双波段同时相位编解码。由于波分复用/光码分复用系统中信道间干涉和噪声的影响, 解码输出脉冲的信号波形出现劣化, 自相关曲线旁瓣明显增大, 自相关峰展宽至8.2 ps。在非线性放大环镜(NALM)的阈值判决作用下, 解码输出脉冲的信号波形质量有了明显的改善, 自相关峰宽度压缩至4.8 ps, 较好地抑制了自相关曲线的旁瓣和噪声。实验中非线性放大环镜的输入信号峰值功率约为8 mW。

Wavelength division multiplexing/optical code division multiplexing (WDM/OCDM) system based on supercontinuum (SC) and superstructured fiber Bragg grating (SSFBG) is experimentally demonstrated, simultaneous dual-wavelength optical encoding of a single supercontinuum source using SSFBG is achieved. Under the impact of the interchannel interference and noise of the WDM/OCDM system, the degradation of the pulse waveform is obvious, the width of the main peak is broadened to 8.2 ps and the sidelobe of the auto-correlation trace is increasing apparently. In the receiver, a nonlinear amplifying loop mirror (NALM) is introduced to improve the system performance, both the sidelobe and the pedestal are reduced, the waveform quality of decoded output signal is enhanced, and the auto-correlation peak of decoded output pulse is compressed to 4.8 ps. The peak power of the input signal in the NALM is about 8 mW.