QAM optical modulators
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United States of America Patent
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Apr 19, 2011
Grant Date -
May 6, 2010
app pub date -
Sep 25, 2009
filing date -
Dec 31, 2007
priority date (Note) -
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Abstract
An exemplary optical modulator includes an interferometer. The interferometer includes an input optical coupler, an output optical coupler, and two or more controllable optical waveguides. Each controllable optical waveguide connects the input optical coupler to the output optical coupler and has an electro-absorption modulator along a segment thereof. Two of the controllable optical waveguides are connected to transmit to an output of the output optical coupler light of substantially different maximum amplitude.
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