Phase noise reduction by self-phase locking in semiconductor lasers using phase conjugate feedback

Author

Petersen, Lykke ; Gliese, Ulrik ; Nielsen, Torben Nørskov

Author_Institution

Center for Broadband Telecommun., Tech. Univ. Denmark, Lyngby, Denmark

Volume

30

Issue

11

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

2526

Lastpage

2533

Abstract

A theoretical analysis of the behavior of the frequency/phase noise of semiconductor lasers with external phase conjugate feedback is presented. It is shown that the frequency noise is drastically reduced even for lasers with butt-coupled phase conjugate mirrors. In this laser system, the phase noise takes a finite-low value corresponding to a state of first-order self-phase locking of the laser. As a result, the spectral shape of the laser signal does not remain Lorentzian but collapses around the carrier to a delta function with a close to carrier noise level of less than -137 dBc/Hz. The total phase variance of this laser signal, in a 20 GHz noise bandwidth, is less than 0.002 rad²

Keywords

laser feedback; laser mirrors; laser mode locking; laser noise; laser theory; optical phase conjugation; phase noise; semiconductor device noise; semiconductor lasers; 20 GHz; Lorentzian; butt-coupled phase conjugate mirrors; carrier noise level; delta function; external phase conjugate feedback; finite-low value; first-order self-phase locking; frequency noise; laser signal; laser system; noise bandwidth; phase conjugate feedback; phase noise; phase noise reduction; self-phase locking; semiconductor lasers; spectral shape; total phase variance; Frequency; Laser feedback; Laser noise; Laser theory; Noise level; Noise reduction; Noise shaping; Phase noise; Semiconductor device noise; Semiconductor lasers;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.333704

Filename

333704