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Guided Wave Optics and Photonic Devices by Ajoy Ghatak, Shyamal Bhadra

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12

Fibre Bragg Gratings

Basic Theory

Ajoy Ghatak

Indian Institute of Technology Delhi

Somnath Bandyopadhyay and Shyamal Bhadra

CSIR-Central Glass & Ceramic Research Institute

CONTENTS

12.1    Introduction

12.2    Basic Theory of FBG

12.3    Comparison with Experimental Data

12.1    INTRODUCTION

Fibre Bragg gratings (FBGs) are characterized by a periodic refractive-index variation along the z-axis; that is, along the propagation axis in an optical fibre. FBGs have very interesting wavelength-dependent characteristics and thus they find important applications as sensors, dispersion compensators and in many other diverse areas. In this chapter, we will present a detailed analysis of the working of the FBG using what is usually referred to as ...

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