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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 24 — Dec. 2, 2013
  • pp: 29186–29194

Phase-noise characteristics of a 25-GHz-spaced optical frequency comb based on a phase- and intensity-modulated laser

Atsushi Ishizawa, Tadashi Nishikawa, Akira Mizutori, Hidehiko Takara, Atsushi Takada, Tetsuomi Sogawa, and Masafumi Koga  »View Author Affiliations

Optics Express, Vol. 21, Issue 24, pp. 29186-29194 (2013)

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We investigated phase-noise characteristics of both a phase/intensity-modulated laser with 25-GHz mode spacing and a mode-locked fiber laser with carrier-envelope-offset (CEO) locking. As the separation from the frequency of the continuous wave (CW) laser diode (LD) for a seed light source increases, the integrated phase noise of each comb mode of both the phase/intensity-modulated laser and supercontinuum light originating from it increases with the same slope as a function of mode number. The dependence of the integrated phase noise on mode number with the phase/intensity-modulated laser is much larger than with the mode-locked fiber laser of the CEO locking. However, the phase noise of the phase/intensity-modulated laser is extremely lower than that of the mode-locked fiber laser with CEO locking in the frequency region around the CW LD. The phase noise of the phase/intensity-modulated laser with 25-GHz mode spacing and that of the mode-locked fiber laser with the CEO locking could be estimated and were found to be almost the same at the wavelengths required in an f-to-2f self-referencing interferometer. Our experimental results indicate the possibility of achieving an offset-frequency-locked frequency comb with the phase/intensity-modulated laser.

© 2013 Optical Society of America

OCIS Codes
(230.4110) Optical devices : Modulators
(320.7090) Ultrafast optics : Ultrafast lasers
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Ultrafast Optics

Original Manuscript: September 6, 2013
Revised Manuscript: October 25, 2013
Manuscript Accepted: October 31, 2013
Published: November 18, 2013

Atsushi Ishizawa, Tadashi Nishikawa, Akira Mizutori, Hidehiko Takara, Atsushi Takada, Tetsuomi Sogawa, and Masafumi Koga, "Phase-noise characteristics of a 25-GHz-spaced optical frequency comb based on a phase- and intensity-modulated laser," Opt. Express 21, 29186-29194 (2013)

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