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Amplitude-phase decorrelation: a method for reducing intensity noise in semiconductor lasers

Newkirk, Michael A. and Vahala, Kerry J. (1991) Amplitude-phase decorrelation: a method for reducing intensity noise in semiconductor lasers. IEEE Journal of Quantum Electronics, 27 (1). pp. 13-22. ISSN 0018-9197. doi:10.1109/3.73536.

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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+α^2), 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.

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Vahala, Kerry J.0000-0003-1783-1380
Additional Information:© Copyright 1991 IEEE. Reprinted with permission. Manuscript received June 6, 1990; revised August 24, 1990. This work was supported in part by the National Science Foundation. The work of K.J. Vahala was supported by a Richard P. Feynman Hughes Fellowship. The authors thank H. Blauvelt and J. Paslaski of Ortel Corporation for DFB lasers and mounting the detectors used in the experiment, and J. Dawson for technical assistance.
Subject Keywords:distributed feedback lasers; electron device noise; optical correlation; optical dispersion; semiconductor junction lasers
Issue or Number:1
Record Number:CaltechAUTHORS:NEWieeejqe91
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9625
Deposited By: Archive Administrator
Deposited On:19 Feb 2008
Last Modified:08 Nov 2021 21:00

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