OPTICAL FIBER COMMUNICATION WITH EDFA

Optical Fiber Communication with EDFA in Matlab

Abstract

The scope of this paper is to analyze the performance of augmented gain EDFA systems using Single and Multi-wavelength Input sources. The Performance of an Optical Communication system can be improved by the use of EDFAs as an Optical Amplifier. Erbium doped fibre amplifier (EDFA) is an important element in DWDM networks. We can achieve a flat gain spectrum by modelling the dynamic characteristics of an EDFA. This paper presents basic EDFA model operating on single (1550nm) and multi (1520-1610) nm wavelength operation with their simulation results. For the present work, we have used EDFA design software tool. It simulates various characteristics such as amplified spontaneous emission, gain, noise figure etc. in efficient manner. The working principle of this software provides accurate simulations and results. It confirms the excellent agreement between simulations and results obtained in real EDFA design. The proposed model consists of an input source, isolator, pump source, erbium fibre and WDM coupler. By changing the design parameters such as Input signal power and Pump Power, the different performance parameters (gain and noise figure) can be optimized. Without changing the values of isolator, erbium fibre length and WDM coupler and keeping the values of Input signal power -30dBm and Pump Power 80mW the obtained optimized gain is 34.45dB for single wavelength source and 32.924 dB for multi wavelength source.

TABLE OF CONTENTS

Abstract2

Introduction4

Basic Principle Of Edfa5

Gain And Noise Figure In An Edfa7

Literature Review8

Work Methodology10

Applied Methodology10

Proposed Work10

Proposed Model Simulation12

Results & Discussions16

Conclusion and Future Aspects20

References21

Optical Fiber Communication with EDFA

Introduction

Now a days, EDFAs have been an interesting and active research area in the field of Optical Fiber Communication Systems .EDFAs are reliable for transmitting data through Long distance because of their wide bandwidth and optimum bit error rate (Novak et al, 2002: 41). The light signal passing through the optical fiber is attenuated due to fiber absorption and scattering losses. To avoid this problem, One of the most efficient and versatile optical amplifier is EDFA. The use of EDFA as a Booster and Pre-amplifier in an OFCS have enhanced the capacity of light wave systems beyond 1Tb/s.Fig.1 is showing an optical fiber system using EDFA as a booster and Pre- amplifier (Martini et al, 2009: 69).

EDFAs deployed in WDM networks provide Multi channel amplification with no cross talks.WDM technology employing EDFAs will play a dominant role for next generation high speed networks. The ability to pump the devices at different wavelengths and low coupling losses are the main features of an EDFA.EDFAs used together with the Raman amplifiers provide ultra-low NF combined amplifiers which are used in very high bit rate links. The main advantages of EDFA are high gain and low noise figure (Awaji et al, 2009: 39). The performance of EDFA is highly affected by Concentration of Erbium ions and temperature.

Basic principle of EDFA

The basic principle for Amplification in an Erbium doped fiber amplifier is stimulated emission. In stimulated emission process, the light wave signal itself acts ...