Optical gain flattening filter using VPG-based optical elements
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United States of America Patent
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May 31, 2005
Grant Date -
Mar 20, 2003
app pub date -
Sep 16, 2002
filing date -
Sep 20, 2001
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Abstract
An optical gain flattening filter for attenuating the wavelength power levels of an optical beam to a threshold value. The filter has a series of volume phase gratings which each have a loss spectrum. The sum of the loss spectra for the volume phase gratings is about equal to the opposite of the gain spectrum of the optical amplifier. As the optical beam passes through the volume phase gratings, the sum of the loss spectra is added to the gain spectrum of the optical amplifier such that the optical beam is attenuated to the threshold value.
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