Study of Optical Gain in Semiconductor Quantum Structures by Optical Pumping
Date Issued
2006
Date
2006
Author(s)
Yang, Chung-Yuan
DOI
zh-TW
Abstract
Optical gain is one of the most important parameters which determine the properties of semiconductor lasers. There are several methods for optical gain measurement. Every method has its disadvantages such as high-resolution spectrometers required for Hakki-Paoli method, difficulties in optical alignment and coupling for Henry method.
In this thesis, we focus firstly on the variable stripe length method, and compare the modal gain in optical pumping and current injection. Semiconductor optical amplifier(SOA) structures are used to measure the modal gain from low excitation to high excitation. Although the experimental setup is more complicated, it can be applied under some measurement conditions where the variable-stripe-length method using optical pumping or current injection will be inappropriate.
Based on the results in our measurement and analysis, the variable-stripe-length method, either using electrical or optical pumping, can not be applied in absorption case under low excitation. If we use SOA structures to measure the gain at a certain wavelength, the difficulties encountered above can be overcome.
Subjects
光激發法
半導體光放大器
Semiconductor Optical Amplifier
Optical Pumping
Type
thesis
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