DocumentCode :
1448923
Title :
Amplitude-phase decorrelation: a method for reducing intensity noise in semiconductor lasers
Author :
Newkirk, Michael A. ; Vahala, Kerry J.
Author_Institution :
Dept. of Appl. Phys., California Inst. of Technol., Pasadena, CA, USA
Volume :
27
Issue :
1
fYear :
1991
fDate :
1/1/1991 12:00:00 AM
Firstpage :
13
Lastpage :
22
Abstract :
It has been shown that the method of amplitude-phase decorrelation can reduce the fundamental intensity noise floor of semiconductor laser light over a wide bandwidth by the ratio 1/(1+α2), where α is the linewidth enhancement factor. The method uses a dispersive element to convert phase noise into intensity noise. This technique was recently demonstrated by reducing intensity noise from a DFB (distributed feedback) laser as much as 7 dB below its intrinsic level. In the present work, the authors extend these results by characterizing the frequency dependence of the noise reduction. Optimum reduction is achieved in the flat region of the spectrum and diminishes at higher frequencies approaching the relaxation resonance. The correlation properties of the fluctuations are also investigated
Keywords :
distributed feedback lasers; electron device noise; optical correlation; optical dispersion; semiconductor junction lasers; DFB lasers; amplitude-phase decorrelation; dispersive element; distributed feedback; fluctuations; frequency dependence; fundamental intensity noise floor; intensity noise; laser diode noise; linewidth enhancement factor; noise reduction; optical correlation; phase noise; relaxation resonance; semiconductor lasers; wide bandwidth; Bandwidth; Decorrelation; Distributed feedback devices; Laser noise; Noise level; Noise reduction; Phase noise; Semiconductor device noise; Semiconductor lasers; Signal to noise ratio;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/3.73536
Filename :
73536
Link To Document :
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