Shaping the bandpass spectrum of a tunable filter for optical network applications
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United States of America Patent
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Nov 28, 2017
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app pub date -
Sep 22, 2016
filing date -
Sep 22, 2016
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Abstract
A tunable optical filter is described, utilizing a diffraction grating and a rotating mirror. By incorporating a phase screen, or the combination of a phase screen and a transmission amplitude-modulated mask, located in front of the rotating mirror, or possibly at other locations in the optical path, the selected wavelength's passband spectrum can be shaped in a variety of ways. In particular, the output spectrum of the tunable optical filter can be made flatter within the passband, while maintaining good isolation of adjacent channels or wavelengths.
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