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Proceedings Paper

Dielectric ultra wideband optical E-field sensors
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Paper Abstract

Aimed at test and evaluation needs on high power microwave (HPM) weapons, we describe new developments on miniature all-dielectric optical field sensors with flat RF sensing response from ~ MHz to 12 GHz, with negligible field perturbation, good sensitivity (~70 mV/(mH√z), and >100dB dynamic range. Present devices use a 20 mm long sensing region in an integrated optical (IO) waveguide Mach-Zehnder interferometer (MZI) using electrooptic (EO) polymer for the waveguide. The fiber-coupled optical transmitter/receiver utilizes common optical communication technology. The incident HPM RF field induces an instantaneous change in the index of refractive of the polymer that is converted into an optical intensity modulation in the MZI device. The poled EO polymer requires no electrodes nor metallic antennas that can distort the field under test. We characterized the frequency response and polarization sensitivity of the field sensor, and both agree well with modeling predictions. Common fabrication limitations result in devices with sensitivity to thermal drift. New sensor designs are being developed with remote bias control that also can provide self-calibration. To further reduce the sensor size and insertion loss, beneficial for array applications, an "in-fiber" field sensor is being developed. The core of a D-shaped fiber is partially removed and replaced with EO polymer. Such a device may use polarization modulation sensing, or be configured in similar MZI structures as the IO waveguide sensors.

Paper Details

Date Published: 26 May 2006
PDF: 11 pages
Proc. SPIE 6219, Enabling Technologies and Design of Nonlethal Weapons, 62190F (26 May 2006); doi: 10.1117/12.665995
Show Author Affiliations
Wen Wang, IPITEK (United States)
Haim Lotem, IPITEK (United States)
De Yu Zang, IPITEK (United States)
Richard Forber, IPITEK (United States)
Stephen Schultz, Brigham Young Univ. (United States)
Richard Selfridge, Brigham Young Univ. (United States)

Published in SPIE Proceedings Vol. 6219:
Enabling Technologies and Design of Nonlethal Weapons
Glenn T. Shwaery; John G. Blitch; Carlton Land, Editor(s)

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