The scheme of FBGs-based OCDMA spectral-amplitude-coding（SAC） for OCDMA system with optical orthogonal code is discussed; The designing and the achievement process of SAC encoder/decoder with)1

1

1（）

(2+++=qqqwNlare firstly submitted; The performance of this system

the SIR and BER resulted from multi-access interference （MAI）

are also analyzed in detail under the condition that the powers of code chips are not uniform; the applied foreground of this system is predicted.