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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 4 — Feb. 25, 2013
  • pp: 4139–4144

Discretely tunable comb spacing of a frequency comb by multilevel phase modulation of a periodic pulse train

Antonio Malacarne and José Azaña  »View Author Affiliations

Optics Express, Vol. 21, Issue 4, pp. 4139-4144 (2013)

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We experimentally demonstrate tunable comb spacing of an original 10-GHz periodic frequency comb by spectral Talbot effect over an unprecedented range of even and odd comb spacing division factors, from 2 to 9. The implementation has been achieved by periodic electro-optic (EO) temporal phase modulation of the original comb (conventional mode-locked optical pulse train) with multilevel modulation functions, produced by an arbitrary waveform generator (AWG). These comb spacing division processes have been observed through the use of a high-resolution (20-MHz) optical spectrum analyzer. Comb spacing tuning is achieved without essentially affecting the spectral bandwidth and total energy of the original comb signal. Our results also confirm that the spectral Talbot method does not require carrier-envelope phase stabilization in the input frequency comb. Numerical studies on the impact of deviations in the applied phase modulation functions confirm the robustness of the technique, in agreement with the experimental results.

© 2013 OSA

OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(070.6760) Fourier optics and signal processing : Talbot and self-imaging effects
(140.4050) Lasers and laser optics : Mode-locked lasers
(320.1590) Ultrafast optics : Chirping

ToC Category:
Ultrafast Optics

Original Manuscript: December 19, 2012
Revised Manuscript: January 23, 2013
Manuscript Accepted: January 26, 2013
Published: February 11, 2013

Antonio Malacarne and José Azaña, "Discretely tunable comb spacing of a frequency comb by multilevel phase modulation of a periodic pulse train," Opt. Express 21, 4139-4144 (2013)

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