Abstract

In this paper, we have proposed a narrow band spectral-sliced wavelength division multiplexing (WDM) system and investigated its performance for optical access networks application. In the proposed system, the low cost light emitting diodes (LEDs) are used as the broad band light source. The system performance investigation was carried out using non-return-to-zero (NRZ) and return-to-zero (RZ) modulation format by OptiSystem Software, Version 7.0. We used two network system models, the first one used RZ pulse generator and the second one used NRZ pulse generator, and both systems are tested without any amplifier. It was found that NRZ pulse generator signal performance is better than those of RZ pulse generator. The proposed system network simulation runs at different bit rates (BR), such as 622 Mb/s, 1 and 1.5 Gb/s, respectively. We ascertained from the network simulation results that the proposed system exhibits better performance at 622 Mb/s as compared to others bit rates. Furthermore, the overall system performances are characterized through bit-error-rate (BER) and BR including the received optical power at various BR. In this analysis, the BER performance has been considered as the main system performance criterion. It has been shown, that the proposed method with NRZ modulation technique provides improved transmission performance as compared to the return-to-zero modulation technique.

Key words: Non-return-to-zero/Return-to-zero modulation format, spectral slicing, wavelength division multiplexing (WDM).