Performance comparison of various detection techniques for SAC-OCDMA system using DW and MDW code

Optical code division multiple access (OCDMA) systems allow several users to access a medium simultaneously without any contention. Each user is assigned a unique code which is orthogonal to all other codes assigned to various users in the system. In this paper we studied the effect of different combination of codes and detection techniques for spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems. The system is simulated with double weight (DW) and modified double weight (MDW) codes for direct detection, complementary subtraction detection, AND detection, modified-AND detection as well as single photodiode detection (SPD) technique via OptiSystem software. Fiber Bragg gratings (FBGs) are used as encoder/decoder. The simulation results show that the single photodiode detection offer best bit-error rate (BER) performance compared to other detection techniques.