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Proceedings Paper

Low drive voltage modulators with ultra low loss serpentine electrodes for electric field sensing with optical fibers
Author(s): James H. Cole; Marta M. Howerton; Robert P. Moeller; John Niemel; L. Cundin; C. Sunderman
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Paper Abstract

A key analog fiber-optic link parameter for RF and microwave antenna remoting is conversion gain or loss, which is a measure of the output RF power to the input RF power at the modulator. The link conversion loss can be minimized by using high-power lasers, modulators with low drive voltages, and sensitive photodetectors. It is highly desirable to achieve link gain without RF amplification. This has not been possible for broadband operation due to the required modulator drive voltages. This paper reports on the development of optical waveguide modulators that can achieve subvolt drive voltages to frequencies of approximately 20 GHz. Long interaction length, multipass LiNbO3 serpentine modulators have been fabricated employing low optical loss compact 180° turns. A record minimum RF loss achieved with a novel bridge structure electrode and used in these high performance modulators is presented. These modulators when connected to conventional antennas, operate as optical fiber electric field sensors.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623602
Show Author Affiliations
James H. Cole, Naval Research Lab. (United States)
Marta M. Howerton, Naval Research Lab. (United States)
Robert P. Moeller, Naval Research Lab. (United States)
John Niemel, Naval Research Lab. (United States)
L. Cundin, SFA, Inc. (United States)
C. Sunderman, SFA, Inc. (United States)

Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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