A new method for electrical frequency locking of optical FDM transmitters

Author

Skjoldstrup, Bjarke ; Bodtker, E. ; Jacobsen, Gunnar

Author_Institution

TFL Telecommun. Res. Lab., Horsholm, Denmark

Volume

9

Issue

4

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

494

Lastpage

504

Abstract

A novel method for locking the frequency spacing between semiconductor lasers electrically is presented. The method is a modification of the offset frequency master-slave principle. The method allows the frequency spacing between optical channels to be chosen independently, with an accuracy determined by the selectivity of the electronics, and it improves the frequency stability of the locked lasers. A rigorous analytical model of the locking configuration is presented. This model is used to investigate how laser frequency noise and electrical noise from the locking circuit affect the frequency stability of the locked lasers. It is found that the improvements in frequency stability can be achieved for up to 350 lasers, each having a linewidth of 1 MHz. Consequently, the method is suited to lock the transmitters in a coherent optical FDM system

Keywords

frequency division multiplexing; laser frequency stability; optical communication equipment; semiconductor junction lasers; coherent optical FDM system; electrical frequency locking; electrical noise; electrically locked laser frequency; frequency spacing; laser frequency noise; laser frequency stability; laser linewidth; locking circuit; offset frequency master-slave principle; optical FDM transmitters; optical channels; semiconductor lasers; Circuit noise; Circuit stability; Frequency; Laser mode locking; Laser noise; Laser stability; Optical noise; Optical transmitters; Semiconductor device noise; Semiconductor lasers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.76664

Filename

76664