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Electro-Optic Resonant FSR Modulators Based on a Dual-Disc Resonator for Increasing the Sensitivity-Bandwidth Product

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3 Author(s)
Yoo Seung Lee ; Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA ; Sang-Shin Lee ; William H. Steier

Resonant free-spectral-range (FSR) RF-optic modulators using dual-disc resonators with a 2:1 ratio of the radii of the discs have been proposed and theoretically analyzed to increase the sensitivity-bandwidth product compared with that of a single resonator modulator. The transmission of the coupled resonator structure is analyzed for various coupling parameters. The phase of the larger resonator is electro-optically modulated, and the output fields at the input laser frequency and the generated sideband frequencies are calculated. The detected RF power is then calculated. The modulator sensitivity, 3-dBe modulation bandwidth, and their product have been analyzed. The sensitivity and modulation bandwidth can be increased by factors of 1.9 and 6.4, respectively, for the different cases. The sensitivity-bandwidth product can be increased up to a factor of 3.3 in one design. For ??5% error of the ratio of the radius of each disc, errors of the sensitivity and modulation bandwidth were acceptable.

Published in:

Journal of Lightwave Technology  (Volume:28 ,  Issue: 5 )