Multiple output semiconductor ring lasers with high external quantum efficiency

Author

Yu, S. ; Krauss, T.F. ; Laybourn, P.J.R.

Author_Institution

Dept. of Electron. & Electr. Eng., Glasgow Univ., UK

Volume

144

Issue

1

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

19

Lastpage

22

Abstract

The external quantum efficiency of semiconductor ring lasers has been significantly improved by introducing output couplers that couple more light out of the ring cavity. Improvements from 10% and 16% to 14% and 27% of a comparable single 2×2 MMI coupler device were achieved by using 3×3 multimode interference (MMI) couplers and dual 2×2 MMI couplers, respectively. A further increase to the value of 33% (or 2 times that of the previous devices) was obtained by AR coating the output facets of the dual 2×2 MMI coupler devices. These devices also provided four output beams as required in an integrated optical time domain multiplexing (OTDM) system

Keywords

laser modes; light interference; optical couplers; optical transmitters; ring lasers; semiconductor lasers; time division multiplexing; 2×2 MMI coupler device; AR coating; high external quantum efficiency; integrated optical time domain multiplexing system; multimode interference couplers; multiple output semiconductor ring lasers; output facets; ring cavity; semiconductor ring lasers;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:19971066

Filename

580327