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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4753–4762

Dispersion dependence of linewidth in actively mode-locked ring lasers

Akira Takada, Makoto Fujino, and Shigenori Nagano  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 4753-4762 (2012)
http://dx.doi.org/10.1364/OE.20.004753


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Abstract

We studied the spectral linewidth narrowing of wavelength-swept actively mode-locked ring lasers (AMLLs). The numerical calculations for the static-state AMLL led us to predict that anomalous dispersion would narrows the linewidth. We examined the effect experimentally using AMLL setups for normal and anomalous dispersive cavities via the normal or inverse use of a linearly chirped fiber Bragg grating. The experiment indicated that the cavity with anomalous dispersion always generates narrower linewidth lasers than its normal dispersion equivalent. The cavity with anomalous dispersion also achieved a 0.08 nm linewidth. Using the anomalous dispersion setup, we observed instantaneous linewidth broadening during wavelength sweeping. Although the coherence of AMLL decreased drastically when the sweep rate became very rapid beyond a single roundtrip, narrow-linewidth lasing was observed within a single roundtrip. In summary, we demonstrated the use of 150 kHz wavelength sweeping with a 40-nm range and a 2.7-m short-length anomalous dispersion cavity.

© 2012 OSA

OCIS Codes
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
(140.3600) Lasers and laser optics : Lasers, tunable
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 28, 2011
Revised Manuscript: January 25, 2012
Manuscript Accepted: February 6, 2012
Published: February 10, 2012

Citation
Akira Takada, Makoto Fujino, and Shigenori Nagano, "Dispersion dependence of linewidth in actively mode-locked ring lasers," Opt. Express 20, 4753-4762 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-4753


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