Low-cost fast variable optical attenuator for optical wavelength tracking
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United States of America Patent
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Jan 21, 2014
Grant Date -
Jan 17, 2013
app pub date -
Sep 13, 2012
filing date -
Dec 16, 2009
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Abstract
Variable optical attenuator (VOA) formed by disposing upon a substrate a waveguide, a p-type region and an n-type region about the waveguide, and an epi-silicon region disposed upon the waveguide, the VOA responsive to a bias current to controllably inject carriers into the waveguide to attenuate thereby optical signal propagating through the waveguide.
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