Gain-assisted electroabsorption modulators
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United States of America Patent
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Jul 4, 2006
Grant Date -
Mar 16, 2006
app pub date -
Sep 16, 2004
filing date -
Sep 16, 2004
priority date (Note) -
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Abstract
A light modulator having a waveguide and a resonator is disclosed. The waveguide routes light of wavelength .lamda. past the resonator. The resonator is coupled to the waveguide such that a portion of the light is input to the resonator, the resonator having a resonance at .lamda.. The resonator includes a gain region in which light of wavelength .lamda. is amplified and an absorption region in which light of wavelength .lamda. is absorbed, the absorption region having first and second states, the first state absorbing less light of wavelength .lamda. than the second state, the state of the absorption region is determined by an electrical signal coupled to the absorption region. The gain region provides a gain that compensates for the light absorption in the first state. In one embodiment, the waveguide and resonator are critically coupled when the absorption region is in the second state.
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