4. Optical Amplifiers - Introduction

4.1 Interaction of photons with atoms and solids

Distribution of electrons in thermal equilibrium

Absorption, spontaneous emission and stimulated emission

4.2 Optical amplifiers: classification, basic configurations and principles of operation

4.3 Energy levels and atomic rate equations

4.4 Gain coefficient

4.5 Optical amplifier noise

Amplifier optical noise: OSNR

Electrically equivalent: SNR

4.6 EDFA transient response

Project 4.1: Characterization of Erbium Doped Fiber Amplifier: ASE noise spectrum versus pump laser current

Project 4.2: Characterization of Erbium Doped Fiber Amplifier: signal - noise competition

Project 4.3: Characterization of Erbium Doped Fiber Amplifier: PSignalOut versus PSignalIn, Gain determination