Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1990-11-06
1992-06-02
Lee, John D.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 2, 385 4, G02B 610
Patent
active
051194473
ABSTRACT:
An external electrooptic modulator is provided offering high linearity and low intermodulation distortion. A Mach Zehnder modulator is followed by a directional coupler. The Mach Zehnder modulator is modulated with a first pair of electrodes at a first polarity. The modulating signal is scaled by a factor .eta. and applied to a separate pair of electrodes for the directional coupler at a second polarity opposite to the first polarity. Separate DC bias electrodes can be provided in the Mach Zehnder modulator. The modulator is particularly appropriate for use in optical transmission systems for cable television applications.
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General Instrument Corporation
Heartney Phan T.
Lee John D.
Lipsitz Barry R.
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