International Journal of Engineering and Technology

Optical communication systems are extremely complex and difficult to analyze. It is often hard to predict the effect of various characteristics of the devices used on the signal fidelity in a fiber optic link. This work involves simulation of coarse wavelength division multiplexing (CWDM) transceiver for end-to-end based on the effect of extinction ratio and with the use of EDFA. Simulation software is available commercially which can realistically model an optical link. Such simulation helps in analyzing the module under development and predicts the performance for a given link distance and the simulation output helps in eliminating any likely performance degradation before realizing the actual hardware. The objective of the fiber optic link is to transport data or communication signals reliably over a longer distance. The simulation objective is to ensure that the received pulses are of appropriate shape and of sufficient intensity, with minimized loss due to noise or attenuation, and to remove distortion present in the signal. The Q factor and BER obtained from either the eye diagram analyzer or the BER analyzer are used to analyze the degradation of the signal at the receiver components. In this paper, simulation results of CWDM transceiver modules are presented .Non-Return to Zero (NE) electrical signals from a Pseudo-Random Bit Sequence (PRBS) Generator are used as modulation input. Signals in the optical domain are detected at the PIN photo detector and are converted into electrical output signals. These electrical signals are amplified using a Trans-impedance Amplifier (TIA) and the amplified signals are filtered through a second order low pass Gaussian filter. Filtering removes distortion caused by noise or interference in the signal.