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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 5 — Feb. 10, 2014
  • pp: 830–835

Simple analytical model for low-frequency frequency-modulation noise of monolithic tunable lasers

Tam N. Huynh, Seán P. Ó Dúill, Lim Nguyen, Leslie A. Rusch, and Liam P. Barry  »View Author Affiliations

Applied Optics, Vol. 53, Issue 5, pp. 830-835 (2014)

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We employ simple analytical models to construct the entire frequency-modulation (FM)-noise spectrum of tunable semiconductor lasers. Many contributions to the laser FM noise can be clearly identified from the FM-noise spectrum, such as standard Weiner FM noise incorporating laser relaxation oscillation, excess FM noise due to thermal fluctuations, and carrier-induced refractive index fluctuations from stochastic carrier generation in the passive tuning sections. The contribution of the latter effect is identified by noting a correlation between part of the FM-noise spectrum with the FM-modulation response of the passive sections. We pay particular attention to the case of widely tunable lasers with three independent tuning sections, mainly the sampled-grating distributed Bragg reflector laser, and compare with that of a distributed feedback laser. The theoretical model is confirmed with experimental measurements, with the calculations of the important phase-error variance demonstrating excellent agreement.

© 2014 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(140.3600) Lasers and laser optics : Lasers, tunable
(270.2500) Quantum optics : Fluctuations, relaxations, and noise

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 16, 2013
Manuscript Accepted: December 23, 2013
Published: February 5, 2014

Tam N. Huynh, Seán P. Ó Dúill, Lim Nguyen, Leslie A. Rusch, and Liam P. Barry, "Simple analytical model for low-frequency frequency-modulation noise of monolithic tunable lasers," Appl. Opt. 53, 830-835 (2014)

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