All-optical switches based on Mach-Zehnder configuration with improved extinction ratios

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作者：
Swiss Federal Inst of Technology, Lausanne, Switzerland [1 ]
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IEEE Photonics Technol Lett | / 1卷 / 55-57期
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Integrated optics - Interferometry - Light extinction - Mathematical models - Nonlinear optics - On-off control systems - Optical waveguides - Optimization - Semiconductor lasers - Waveguide couplers;
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摘要：
We study driving conditions to improve the extinction ratios in 2×2 and 1×2 all-optical switches based on semiconductor optical amplifiers in Mach-Zehnder configuration. In 2×2 switches, the optimization of the relative phases of both arms of the interferometer together with the introduction of an optical push-pull lead to enhanced and symmetrical extinctions. In 1×2 switches, perfect extinctions can theoretically be obtained by adapting the splitting ratios of the input and output couplers to the saturation behavior of the amplifiers.
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