Performance analysis of 2-D Extended-EDW Code for optical CDMA system

Two-dimensional Optical Code Division Multiple Access (2-D OCDMA) has gained great interest among researchers in optical communication systems. This work is aimed to present an alternative way of formulating the spectral/spatial incoherent two-dimensional Extended Enhanced Double Weight (2-D Extended-EDW) code. This code is proposed to suppress the phase induced intensity noise (PIIN) by using multiple access interference (MAI) cancellation property. The numerical analysis shows that 2-D EDW code has a better performance, in terms of bit error rate (BER) and the cardinality compared with one-dimensional Enhanced Double Weight (1-D EDW) code. In comparison with different combinations of spatial and spectral code length for 2-D Extended-EDW code, we found that by increasing the number of time chip, it significantly enhances the performance of the system.