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Method and system for obtaining variable optical attenuation with very low polarization dependent loss over an ultra wide dynamic range
Method and system for obtaining variable optical attenuation with very low polarization dependent loss over an ultra wide dynamic range
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机译:在超宽动态范围内以极低的偏振相关损耗获得可变光衰减的方法和系统
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摘要
A method and system of operating a variable optical attenuator to provide a required total attenuation in a planar lightwave circuit. The method comprises providing a first Mach-Zehnder interferometer having a first and a second arm carrying signals in an arbitrary polarization state, providing a second Mach-Zehnder interferometer having a third and a fourth arm carrying signals in an arbitrary polarization state, the second Mach-Zehnder interferometer concatenated in tandem with the first Mach-Zehnder interferometer, and cooperatively operating the concatenated first and second Mach-Zehnder interferometers to obtain the required total attenuation and an effectively nil polarization dependent loss.
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