Optical data emitter device

Details Optical data emitter device Optical data emitter device

1997-11-24

1999-12-14

Lee, John D.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 2, G02B 626

Patent

active

060028165

ABSTRACT:
In order to increase the distance over which binary data can be transmitted over an optical fiber, the device compensates for fiber-generated chromatic dispersion by modulating the emitted light wave both in power and in phase, in such a manner as to ensure that there is a phase shift of close to 180.degree. within each binary cell for which the optical power is low but not zero. The device comprises a Mach-Zehnder type interferometer made on a substrate of III-V elements and designed so that in the absence of electrical voltages being applied to its electrodes it establishes destructive interference. A control circuit applies control voltages to the electrodes which voltages have DC components that are substantially equal, with at least one of the control voltages being the result of superposing a bias voltage on a filtered signal obtained by lowpass filtering an input electrical signal. The invention is applicable to long distance transmission over standard optical fibers.

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patent: 5694504 (1997-12-01), Yu et al.
K. Yonenaga et al, "Optical Duobinary Transmisison System with No Receiver Sensitivity Degradation", Electronics Letters, Feb. 16, 1995, UK, vol. 31, No. 4, ISSN 0013-5194, pp. 302-304.
J. Yu et al, "Phase-engineered III-V-MQW Mach-Zehnder Modulators", IEEE Photonics Technology Letters, Aug. 1996, IEEE, USA, vol. 8, No. 8, ISSN 1041-1135, pp. 1018-1020, XP000621639.

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