Performance enhancement of incoherent spectral amplitude encoding-optical code division multiple access (SAE-OCDMA) by using dispersion compensation fiber Bragg grating (FBG)

Abstract

Incoherent spectral amplitude encoding optical code division multiple access (SAE-OCDMA) based on fiber Bragg grating (FBG) is one promising technique aim to improve local area networks to have longer span telecommunication network type. In this study, the performance enhancement incoherent SAE-OCDMA is achieved when a dispersion compensation fiber Bragg grating (DCFBG) and erbium doped fiber amplifier (EDFA) are used in optical link. Though, the results can be obtained, these components give good indicator on system performance. In the design, DCFBG is introduced as the dispersion compensation to eliminate the effect of the positive dispersion. This leads to reduce multiple access interference (MAI). While EDFA, is used to compensate loss in conventional single mode fiber (SMF). As a result, the maximum bit error rate (BER) reaches 10-9 and 10-6 for 3 and 7 users, respectively without DCFBG and EDFA at 40 km, respectively, but with DCFBG, the maximum BER reaches 10-21 and 10-10 for 3 and 7 Users, respectively, at the same distance. In this presence case, EDFA and DCFBG are together in optical channel, the maximum BER reaches 10-22 and 10-12 for 3 and 7 users respectively at the same distance (40 km). So that, the transmission distance is improved to 160 and 140 km for 3 and 7 Users, respectively. Simulation results presented in this study are obtained using Opti system and Opti Grating Softwares. Key words: Spectral amplitude encoding-optical code division multiple access (SAE-OCDMA), dispersion compensation fiber Bragg grating (DCFBG), multiple access interference (MAI), phase induced intensity noise (PIIN), Walsh hadamard code (WH code).