Crosstalk reduction in semiconductor laser amplifiers

Author

Bray, M.E. ; Carroll, J.E.

Author_Institution

Dept. of Eng., Cambridge Univ., UK

Volume

139

Issue

2

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

93

Lastpage

100

Abstract

One of the important deficiencies of semiconductor laser amplifiers, compared with fibre amplifiers, is the crosstalk that is created by four-wave mixing and gain saturation. If the electron density were controlled at all points along the amplifier, the crosstalk could be greatly reduced. The paper looks at the theory of optoelectronic feedback, using the spontaneous emission as a measure of the electron density and introducing both linear and differential feedback into the injected current, to control the electron density in an amplifier. The paper also examines the consequential reductions in four-wave mixing. It is concluded that it may be feasible to effect this, particularly in an integrated amplifier. Preliminary practical trials are under way

Keywords

crosstalk; electron density; feedback; laser theory; multiwave mixing; optical saturation; semiconductor junction lasers; crosstalk reduction; differential feedback; diode lasers; electron density; four-wave mixing; gain saturation; injected current; integrated amplifier; linear feedback; optical communications equipment; optical lasers; optoelectronic feedback; semiconductor laser amplifiers; spontaneous emission;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings J

Publisher

iet

ISSN

0267-3932

Type

jour

Filename

135840