Performance evaluation of two-dimensional cyclic shift coding technique for Optical Code Division Multiple Access System

Abstract

This paper proposed design and implementation of wavelength and phase Optical Code Division Multiple Access System (2D-OCDMA) where Cyclic Shift (CS) coding technique is used. Previously this cyclic shift encoding was done in spectral domain but we have proposed the encoding technique in the spectral as well as phase domain. The proposed 2-D Cyclic shift code with spectral as well as phase domain increases the number of users by splitting the optical source to two orthogonal phase signals without the requirement to increase the code length as well as number of LEDs. Thus, the wavelength required for our proposed encoding structure is also reduced. In this paper, this encoding technique has been tested for four users. The performance is analyzed with increase in number of users. The proposed 2D is compared with the previously implemented 1D CS SAC-OCDMA code. Performances of the system designed show better result than the previously designed SAC-OCDMA Cyclic Shift code. The results of the proposed system in terms of parameters like bit error rate is within the range of 10-9.