23 July 2003 All-dielectric fiber-optic passive millimeter-wave antenna
Author Affiliations +
Abstract
An integrated Mach-Zehnder interferometer made of electro-optic polymer, which has excellent broadband (>100 GHz) response, was fabricated as a mm-wave receive antenna. When an electric field is applied to the interferometer arm(s) made of EO material, a phase delay is generated which results in a net imbalance in the interferometer and thus a change in the output intensity. This output intensity change, which contains electric field strength and temporal profile information, is then read by a photodetector and processed. To test this antenna in free space, a micro-strip travelling electromagnetic cell, which has uniform electric field distribution in the 1 GHz range, was constructed. The test results show the antenna had good linear response over a 40 dB power range, at 1 GHz center frequency. The measured minimum detectable E-field strength was about 0.22 V/m (or 6.7 nW/cm2) at 1 kHz bandwidth with a laser power of 7.9 μWatt (-21dBm) measured after the sensor, which agrees with our theoretical calculations. The measured E-field signal increases with increasing laser power, which indicates that significant sensitivity improvement, can be easily obtained by lowering passive losses. The antenna was found to be thermally stable over a temperature range from -30 to 50 C. The antenna sensitivity can be further improved by lowering the device insertion loss, optimizing the photodetector and detection circuitry, and using EO polymers with higher electro-optic coefficients.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wen Cheng Wang, Wen Cheng Wang, Weiping Lin, Weiping Lin, Hank Marshall, Hank Marshall, David T. Schaafsma, David T. Schaafsma, Richard Chaung, Richard Chaung, } "All-dielectric fiber-optic passive millimeter-wave antenna", Proc. SPIE 5100, Digital Wireless Communications V, (23 July 2003); doi: 10.1117/12.487164; https://doi.org/10.1117/12.487164
PROCEEDINGS
8 PAGES


SHARE
Back to Top