Transcription of Chapter 9 Semiconductor Optical Amplifiers
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Chapter 9 Semiconductor Optical Amplifiers
Semiconductor Optoelectronics (Farhan Rana, Cornell University) Chapter 9 Semiconductor Optical Amplifiers Basic Structure of Semiconductor Optical Amplifiers (SOAs) Introduction: Semiconductor Optical Amplifiers (SOAs), as the name suggests, are used to amplify Optical signals. A typical structure of a InGaAsP/InP SOA is shown in the Figure below. The basic structure consists of a heterostructure pin junction. The smaller bandgap intrinsic region has smaller refractive index than the wider bandgap p-doped and n-doped quasineutral regions. The intrinsic region forms the core of the Optical waveguide and the quasineutral regions form the claddings. Current injection into the intrinsic region (also called the active region) can create a large population of electrons and holes.
Semiconductor Optoelectronics (Farhan Rana, Cornell University) 2 ~ 2 g i g n n n i n n c M a ag g M a a ag g a where, g n n g M ag g ~ In the presence of gain, the light field amplitude will increase with distance as e a g 2 z and the
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