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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 22441–22452

Drop-port study of microresonator frequency combs: power transfer, spectra and time-domain characterization

Pei-Hsun Wang, Yi Xuan, Li Fan, Leo Tom Varghese, Jian Wang, Yang Liu, Xiaoxiao Xue, Daniel E. Leaird, Minghao Qi, and Andrew M. Weiner  »View Author Affiliations

Optics Express, Vol. 21, Issue 19, pp. 22441-22452 (2013)

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We use a drop-port geometry to characterize frequency combs generated from silicon nitride on-chip microresonators in the normal group velocity regime. In sharp contrast with the traditional transmission geometry, we observe smooth output spectra with comparable powers in the pump and adjacent comb lines. The power transfer into the comb may be explained to a large extent by the coupling parameters characterizing the linear operation of the resonances studied. Furthermore, comparison of thru- and drop-port spectra shows that much of the ASE noise is filtered out by transmission to the drop-port. Autocorrelation measurements are performed on the drop-port output, without the need to filter out or suppress the strong pump line as is necessary in thru-port experiments. Passively mode-locked pulses with low background are observed in a normal dispersion microcavity.

© 2013 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(190.4360) Nonlinear optics : Nonlinear optics, devices
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(130.3990) Integrated optics : Micro-optical devices

ToC Category:
Integrated Optics

Original Manuscript: July 18, 2013
Revised Manuscript: August 30, 2013
Manuscript Accepted: August 31, 2013
Published: September 16, 2013

Pei-Hsun Wang, Yi Xuan, Li Fan, Leo Tom Varghese, Jian Wang, Yang Liu, Xiaoxiao Xue, Daniel E. Leaird, Minghao Qi, and Andrew M. Weiner, "Drop-port study of microresonator frequency combs: power transfer, spectra and time-domain characterization," Opt. Express 21, 22441-22452 (2013)

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