Guided Wave Optics and Photonic Devices

7	Erbium-Doped Fibre Lasers Aditi Ghosh Indian Institute of Technology Bombay Deepa Venkitesh Indian Institute of Technology Madras R. Vijaya Indian Institute of Technology Kanpur

CONTENTS

7.1    Introduction to Lasers

7.1.1    Active Medium

7.1.2    Population Inversion

7.1.3    Stimulated Emission

7.1.4    Resonator

7.1.5    Spontaneous to Stimulated Emission

7.2    Fibre Lasers

7.2.1    Optical Fibres

7.2.2    Fibre-Optic Amplifiers

7.2.3    Laser Sources Using Optical Fibres

7.2.4    Theory of Fibre Lasers

7.3    EDFLs: Ring Cavity

7.3.1    Energy Levels of Er³⁺ in Glass

7.3.2    Ring Cavity

7.3.3    ASE and Lasing

7.3.4    Tunable Laser Using a Change in Intracavity Loss

7.4    Broadband Generation in Edfrl in C-Band and L-Band

7.4.1    Theory ...