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

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 oscillat...

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Bibliographic Details
Published in:Applied optics (2004) 2014-02, Vol.53 (5), p.830-835
Main Authors: Huynh, Tam N, Duill, Sean P O, Nguyen, Lim, Rusch, Leslie A, Barry, Liam P
Format: Article
Language:English
Subjects:
Carriers
Fluctuation
Lasers
Mathematical analysis
Noise
Relaxation oscillations
Tunable lasers
Tuning
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Summary: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.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.53.000830