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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 26 — Sep. 10, 2004
  • pp: 5079–5091

Electro-Optic Modulator Capable of Generating Simultaneous Amplitude and Phase Modulations

Benedict J. Cusack, Benjamin S. Sheard, Daniel A. Shaddock, Malcolm B. Gray, Ping Koy Lam, and Stan E. Whitcomb  »View Author Affiliations


Applied Optics, Vol. 43, Issue 26, pp. 5079-5091 (2004)
http://dx.doi.org/10.1364/AO.43.005079


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Abstract

We report on the analysis and prototype characterization of a dual-electrode electro-optic modulator that can generate both amplitude and phase modulations with a selectable relative phase, termed a quadrature variable modulator (QVM). All modulation states can be reached by tuning only the electrical inputs, facilitating real-time tuning, and the device has shown good suppression and stability properties. A mathematical analysis is presented, including the development of a geometric-phase representation for modulation. The experimental characterization of the device shows that relative suppressions of 38, 39, and 30 dB for phase, single sideband, and carrier-suppressed modulations, respectively, can be obtained as well as that the device is well behaved when scanning continuously through the parameter space of modulations. The QVM is compared with existing optical configurations that can produce amplitude and phase-modulation combinations in the context of applications such as the tuning of lock points in optical-locking schemes, single-sideband applications, modulation fast-switching applications, and applications requiring combined modulations.

© 2004 Optical Society of America

OCIS Codes
(230.0230) Optical devices : Optical devices
(230.0250) Optical devices : Optoelectronics
(230.2090) Optical devices : Electro-optical devices
(230.4110) Optical devices : Modulators
(230.5440) Optical devices : Polarization-selective devices

Citation
Benedict J. Cusack, Benjamin S. Sheard, Daniel A. Shaddock, Malcolm B. Gray, Ping Koy Lam, and Stan E. Whitcomb, "Electro-Optic Modulator Capable of Generating Simultaneous Amplitude and Phase Modulations," Appl. Opt. 43, 5079-5091 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-26-5079


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