| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 87 === The nonlinear switching effect in a GaAs/AlGaAs all-semiconductor nonlinear optical loop mirror (NOLM) with a multi-mode interference waveguide amplifier (MMIWA) for closing the loop is numerically investigated. The device, designed to imitate the traditional NOLM’s made of fibers, has a much more compact size and a latency several hundred times smaller than the conventional ones do. In the operation of the cw signals, the nonlinear coupling in the MMIWA, and the lateral field redistribution as well as the amplification of the signal through the loop structure, contribute to the nonlinear switching together. Besides investigating the physical mechanism of the device, we vary some important parameters to evaluate their influences on device performance. Related experimental results show consistent trends with the numerical results. Some results for the pulse signals are also presented.
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