The BER Performance Improvement of Optical CDMA Using FBG-based Compensator

An analytical approach is presented to investigate the improvement of bit error rate (BER) performance in direct sequence optical code division multiple access with in-line cascaded optical amplifiers in presence of FBG-based group velocity dispersion (GVD) compensator. Gaussian-shaped optical orthogonal codes are employed as address sequence, and an optical correlator receiver with avalanche photodiode is used in this analysis. The system performance is determined as a function of the fiber length and chip rate. The power penalty suffered by the system is evaluated at BER of 10(-9) on account of receiver, and optical amplifier noises. The numerical results indicate that the BER performance can be improved significantly depending on the fiber length and chiprate. The results also show that about 90% of the GVD-induced penalty can be compensated using FBG-based compensator. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of ICCTSD 2011