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Proceedings Paper

Novel ultrafast sources on chip: filter driven four wave mixing lasers, from high repetition rate to burst mode operation
Author(s): Alessia Pasquazi; Marco Peccianti; Sai T. Chu; Dave J. Moss; Roberto Morandotti
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Paper Abstract

Passive fiber mode-locked lasers enable the excitation of multiple pulses per round trip representing a potential solutions for the increasing demand of practical optical sources with repetition rates of hundreds of GHz or higher. The control of such high repetition rate regimes is however a challenge. To this purpose, linear filters have been used in an "intracavity" configuration to force the repetition rate of the laser. This design is known as dissipative four wave mixing (DFWM) but it is usually unstable and hence marginally suitable for practical applications. We explore the use of nonlinear intracavity filters, such as integrated micro-ring resonators, capable of “driving” the FWM interaction in the laser. We term this approach as Filter-Driven FWM. With a proper choice of the filter properties in terms of free spectral range (FSR) and Q factor, we could observe stable regimes over a wide range of operating conditions, from high repetition rate oscillation at a 200GHz to the formation of two stable spectral comb replicas separated by the FSR of the main cavity (65MHz). High order filters, moreover, allow achieving nonlinear operation over large passbands. With an 11th order filter we achieve low-frequency mode-locking between the main cavity modes that oscillate within each resonance of the filter, producing burst pulsed operation. A stable mode-locked pulse train at 655GHz with an envelope of 42ps at 6.45MHz is achieved.

Paper Details

Date Published: 22 April 2016
PDF: 6 pages
Proc. SPIE 9727, Laser Resonators, Microresonators, and Beam Control XVIII, 97270N (22 April 2016); doi: 10.1117/12.2211071
Show Author Affiliations
Alessia Pasquazi, Univ. of Sussex (United Kingdom)
Marco Peccianti, Univ. of Sussex (United Kingdom)
Sai T. Chu, City Univ. of Hong Kong (Hong Kong, China)
Dave J. Moss, RMIT Univ. (Australia)
Roberto Morandotti, Institut National de la Recherche Scientifique (Canada)

Published in SPIE Proceedings Vol. 9727:
Laser Resonators, Microresonators, and Beam Control XVIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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