Comparison of NRZ and RZ data modulation formats in SAC-OCDMA system under introduced clock timing jitter of laser diode

Abstract: In this paper, the implementation and performance analysis by using various optical fibers in the SAC-OCDMA system for different data modulation formats is presented. The optical fiber is used in communication systems because of its characteristics which include small size, low loss and low interference from outside environment. The various types of optical fibers used in SAC-OCDMA system such as Corning Submarine, Corning TITAN, Corning LEAF and Alcatel 6900 have been compared using different data formats NRZ and RZ formats. It is found that NRZ has the best performance for all the optical fibers used in the system. After that, these fibers have been compared in terms of BER and received optical power. The simulation results revealed that Corning Submarine can provide a better BER as compared to other fibers on varying the input laser power and it suggests that Corning Submarine may be used for OCDMA systems.

Keywords: Spectral amplitude coding-optical code division multiple access (SAC-OCDMA), Bit error rate (BER), Multiple access interference (MAI), Return to zero (RZ), Non return to zero (NRZ)