Control of nearly degenerate four-wave mixing in a distributed feedback semiconductor laser amplifier via coherent electrical modulation

Author

George, D.S. ; McCall, M.W.

Author_Institution

Blackett Lab., Imperial Coll. of Sci., Technol. & Med., London, UK

Volume

141

Issue

1

fYear

1994

fDate

2/1/1994 12:00:00 AM

Firstpage

33

Lastpage

37

Abstract

Synchronous current modulation is investigated theoretically and experimentally as a method for enhancing or suppressing nearly degenerate four-wave mixing in a distributed feedback semiconductor laser amplifier. For modulation depths of 3% an enhancement of 200-300% in phase conjugate signal is observed. Expressions for the current modulation depth required to compensate the optical beat modulation are derived in the saturated and unsaturated case. Also, to enable experimental verification, the average intracavity intensity of the DFB amplifier for given input intensity is calculated. In the unsaturated case the square of the compensating modulation depth is seen to vary linearly with the product of intracavity intensities in accordance with theory

Keywords

distributed feedback lasers; multiwave mixing; optical modulation; semiconductor lasers; DFB laser diodes; coherent electrical modulation; compensating modulation depth; current modulation depth; distributed feedback semiconductor laser amplifier; input intensity; intracavity intensity; modulation depths; nearly degenerate four-wave mixing; optical beat modulation; phase conjugate signal; saturated case; synchronous current modulation; unsaturated case;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:19949797

Filename

278114