High speed, silicon-based electro-optic modulator
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United States of America Patent
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Jun 20, 2006
Grant Date -
Nov 11, 2004
app pub date -
May 10, 2004
filing date -
May 8, 2003
priority date (Note) -
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Abstract
An electro-optic modulator arrangement for achieving switching speeds greater than 1 Gb/s utilizes pre-emphasis pulses to accelerate the change in refractive index of the optical waveguide used to form the electro-optic modulator. In one embodiment, a feedback loop may be added to use a portion of the modulated optical output signal to adjust the magnitude and duration of the pre-emphasis pulses, as well as the various reference levels used for modulated. For free carrier-based electro-optic modulators, including silicon-based electro-optic modulators, the pre-emphasis pulses are used to accelerate the movement of free carriers at the transitions between input signal data values.
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