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Published March 7, 2005 | public
Journal Article Open

Hybrid InGaAsP-InP Mach-Zehnder racetrack resonator for thermooptic switching and coupling control


An InGaAsP-InP optical switch geometry based on electrical control of waveguide-resonator coupling is demonstrated. Thermooptic tuning of a Mach-Zehnder interferometer integrated with a racetrack resonator is shown to result in switching with ON-OFF contrast up to 18.5 dB. The optical characteristics of this unique design enable a substantial reduction of the switching power, to a value of 26 mW in comparison with 40 mW for a conventional Mach-Zehnder interferometer switch. Modulation response measurements reveal a 3 dB bandwidth of 400 kHz and a rise time of 1.8 µs, comparing favorably with current state-of-the-art thermooptic switches.

Additional Information

©2005 Optical Society of America. Received 21 January 2005; revised 23 February 2005; accepted 24 February 2005. The authors would like to thank Dr. Oskar Painter for providing access to fabrication facilities. In addition, John Choi, George Paloczi, Dr. Yanyi Huang, Dr. Koby Scheuer, and Dr. Tobias Kippenberg are thanked for their insightful comments and suggestions.


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