Guided Wave Optics and Photonic Devices

6	Optical Fibre Amplifiers K. Thyagarajan Indian Institute of Technology Delhi

CONTENTS

6.1    Introduction

6.2    Erbium-Doped Fibre Amplifier

6.3    Optical Amplification in EDFAs

6.4    Gain Flattening of EDFAs

6.4.1    Gain Flattening Using External Filters

6.4.2    Intrinsically Flat Gain Spectrum

6.5    Noise in Amplifiers

6.6    EDFAs for S-Band

6.7    Raman Fibre Amplifier

6.7.1    Approximate Solutions

6.8    Conclusions

Reference

6.1    INTRODUCTION

When information-carrying optical signals propagate through an optical fibre, they suffer from attenuation leading to reduction in power, dispersion leading to pulse broadening and nonlinear effects leading to coupling between various frequencies. In order to achieve greater bandwidths ...