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

Lykke Petersen, Ulrik Bo Gliese, Torben Nørskov Nielsen

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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 rad^2
Original languageEnglish
JournalI E E E Journal of Quantum Electronics
Volume30
Issue number11
Pages (from-to)2526-2533
ISSN0018-9197
DOIs
Publication statusPublished - 1994

Bibliographical note

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