Optical code-division multi-access (OCDMA) is one of the most attractive techniques to realize all optical access network. A new OCDMA en-decoder based on super structure fiber Bragg grating (SSFBG) is proposed. Based on the equivalent phase shift theory, the proposed en-decoder adopts Sinc function as its sampling function and needs only one phase mask plate to achieve multiple en-decoding channels with similar performance. Users with different wavelength channels can be encoded (decoded) simultaneously by the proposed multi-channel en-decoder, and the capacity and compatibility of the system with wavelength division multiple (WDM) are improved. Analysis and computer simulation are made on the structure and performance of the encoder-decoder. Result shows that each channel achieves equivalent performance with the pure phase-shift en-decoder, the auto correlative P/W rates of each channel is more than 16.3 dB, the fluctuation of P/W rates is less than 0.4 dB, and the fluctuation of auto-correlation peak is less than 0.04 for the endecoder of 127 bit Gold-series. This multi-channel en-decoder can be used in OCDMA/WDM hybrid system.