Based on extended quadratic congruencies code/one coincidence sequence (EQC/OCS) the incoherent 2-D optical code-division multiple access system (OCDMA) is simulated by using fiber Bragg grating (FBG) and fiber delay line. The expected en/decoding result with four users is obtained by system simulation. It is indicated that the low cost FBG can be employed as en/decoder for EQC/OCS code, which can enhance the system capacity of 2-D OCDMA system.