Chirp compensated Mach-Zehnder electro-optic modulator
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United States of America Patent
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Dec 31, 2002
Grant Date -
Oct 31, 2002
app pub date -
Apr 17, 2001
filing date -
Apr 17, 2001
priority date (Note) -
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Abstract
A Mach-Zehnder electro-optic modulator is formed that exhibits significantly reduced chirp by utilizing an RF electrode that covers a first waveguide arm in a first region of the modulator and covers the second, remaining waveguide arm in a third region of the modulator (with a second, intermediate region used as a transition area for the electrode). Moving the electrode from one waveguide to the other allows for the chirp created in the third region to essentially 'null out' the chirp that accumulated along the first region. Modulation of the optical signal is maintained in the presence of the 'electrode switching' by inverting the domain of the optical substrate material in the third region of the modulator.
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