Optical modulator

Coherent light generators – Particular active media – Semiconductor

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372 28, 372 32, H01S 318

Patent

active

055508553

ABSTRACT:
In an optical modulator including a laser light source emitting laser light and a modulator, a modulation signal source for applying a modulation signal to the modulator, a signal processor for producing and outputting a signal in response to a change in the modulation signal, and a driving current source for generating a driving current applied to the laser light. Wavelength chirping modulation reverse to the wavelength chirping occurring in the modulator is produced in the light emitted from the laser by modulation of the driving current whereby wavelength chirping produced by the modulator is at least partially cancelled and wavelength chirping of the light output from the modulator is reduced.

REFERENCES:
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Ellis et al., "Dispersion Compensation in 450 km Transmission System Employing Standard Fibre", Electronics Letter & vol. 28, No. 10, May 7, 1992, pp. 954-955.
Ishikawa, H., "Monolithic Laser Light Sources for Advanced Optical Communications", Japanese Journal of Applied Physics, Supplements. 22th Conference on Solid State and Materials (1990) No. SB7, 1990, Tokyo, Japan pp. 785-788 (No month available).
Fishman, D. A., "Design and Performance of Externally Modulated 1.5-.mu.m Laser Transmitter in the Presence of Chromatic Dispersion", Journal of Lightwave Technology, vol. 11, No. 4, Apr. 1993, New York, USA., pp. 624-632.
Lourtioz et al, "Fourier-Transform-Limited Pulses from Gain-Switched Distributed-Bragg-Reflector Lasers Using Simultaneous Modulation of Gain and Phase Sections", Electronics Letters, 30 Jul., 1992, vol. 28, No. 16, pp. 1499-1500.
Mak et al, "High-Speed Bulk InGaAsP-InP Electroabsorption Modulators With Bandwidth In Excess Of 20 GHz", IEEE Photonics Technology Letters, vol. 2, No. 10, Oct. 1990, pp. 730-733.

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