Design and Performance Analysis of an Optical CDMA System for 2-D Perfect Difference Codes Using Shifted Sine

A Dynamic Optical Code Division Multiple. Access (DOCDMA) communication system for Two Dimensional (2-D) Perfect Difference codes using Shifted Sine Functions (SSFs) is proposed here. The performance analysis for this OCDMA system has been done. This system is modeled and analyzed taking into account Multiple Access Interference (MAI) or Multiuser interference (MUI), Thermal Noise and Phase Induced Intensity (PIIN) noise. The performance of this system is compared to that of a DOCDMA system using SSFs as functional codes, Noncoherent spatial / spectral OCDMA system with 2-D perfect difference codes and OCDMA system for 2-D M-matrices codes. The results show that the proposed system improves the bit error rate (BER) performance for large number of users. Furthermore, it is found that for low values of the effective power for each user, the BER performance improves manifold. So, BER can be kept to very low values for lower power levels and hence, the system is more robust. KeywordsMultiple Access Interference or Multiuser Interference (MUI), Optical Code Division Multiple Access (CDMA.), Optical fiber Communication Systems, 2-D perfect difference codes, 2-D M matrices codes, Shifted Sine Functions.