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.