Optical waveguides – Integrated optical circuit
Patent
1997-05-30
1999-02-09
Ullah, Akm E.
Optical waveguides
Integrated optical circuit
359130, 385 24, G02B 612
Patent
active
058705120
ABSTRACT:
An improved interferometric modulator permits the reduction in size of optical transmitters. In one embodiment, the optical modulator includes amplifiers or attentuators as phase modulators. In another embodiment, two outputs from a combiner are fed to the modulator, thus avoiding the requirement for an input splitter in the modulator. Light passing through the modulator may be both phase-shifted and amplified or attenuated by optical regulator sections located in the modulator. In another embodiment, the transmitter is included as a multiple-wavelength optical communications source, where individual current sources are provided to actuate a number of light sources feeding into the combiner, a processor controls the operation of each light source, and a modulator driver receives a data input signal to be encoded on the output of the source. By combining a number of modulators, a gray scale modulator may be fabricated for producing a gray scale output, rather than a conventional binary level output.
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Koch Thomas L.
Scifres Donald R.
SDL Inc.
Ullah Akm E.
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