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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 25184–25196

Self-amplitude and self-phase modulation of the charcoal mode-locked erbium-doped fiber lasers

Yung-Hsiang Lin, Jui-Yung Lo, Wei-Hsuan Tseng, Chih-I Wu, and Gong-Ru Lin  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 25184-25196 (2013)

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With the intra-cavity nano-scale charcoal powder based saturable absorber, the 455-fs passive mode-locking of an L-band erbium-doped fiber laser (EDFL) is demonstrated. The size reduction of charcoal nano-particle is implemented with a simple imprinting–exfoliation–wiping method, which assists to increase the transmittance up to 0.91 with corresponding modulation depth of 26%. By detuning the power gain from 17 to 21 dB and cavity dispersion from −0.004 to −0.156 ps2 of the EDFL, the shortening of mode-locked pulsewidth from picosecond to sub-picosecond by the transformation of the pulse forming mechanism from self-amplitude modulation (SAM) to the combining effect of self-phase modulation (SPM) and group delay dispersion (GDD) is observed. A narrower spectrum with 3-dB linewidth of 1.83-nm is in the SAM case, whereas the spectral linewidth broadens to 5.86 nm with significant Kelly sideband pair can be observed if the EDFL enters into the SPM regime. The mode-locking mechanism transferred from SAM to SPM/GDD dominates the pulse shortening procedure in the EDFL, whereas the intrinsic defects in charcoal nano-particle only affect the pulse formation at initial stage. The minor role of the saturable absorber played in the EDFL cavity with strongest SPM is observed.

© 2013 OSA

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.4236) Materials : Nanomaterials
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 26, 2013
Manuscript Accepted: May 28, 2013
Published: October 15, 2013

Yung-Hsiang Lin, Jui-Yung Lo, Wei-Hsuan Tseng, Chih-I Wu, and Gong-Ru Lin, "Self-amplitude and self-phase modulation of the charcoal mode-locked erbium-doped fiber lasers," Opt. Express 21, 25184-25196 (2013)

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