Title :
Remote multi-octave electromagnetic field measurements using analog fiber optic links
Author :
Pappert, S.A. ; Berry, M.H. ; Hart, S.M. ; Orazi, R.J. ; Li, S.T.
Author_Institution :
US Naval Command, Control & Ocean Surveillance Center, San Diego, CA, USA
Abstract :
Summary form only given. Anechoic chamber tests of several electromagnetic field detection systems have been performed. The performance of a 2-18-GHz externally modulated system consisting of a broadband cavity-backed spiral antenna, an optical waveguide modulator, a 1.32- mu m Nd:YAG solid state laser, single-mode optical fiber, and a high-speed photodiode was investigated. Operation with both III-V semiconductor based and lithium niobate based optical waveguide modulators has been investigated and compared for the externally modulated system. An rms electric field sensitivity of 15 mu V/m and a spurious free dynamic range of 102 dB in a 1 Hz resolution bandwidth have been measured with this 2-18 GHz field detection system. The performance of a 30 MHz-500 MHz directly modulated system consisting of a broadband VHF/UHF antenna, a laser diode, single-mode optical fiber, and a photodiode was also studied. For each field sensing system, the frequency response, electromagnetic field sensitivity, dynamic range, and environmental stability were investigated.<>
Keywords :
fibre optic sensors; field strength measurement; optical links; remote sensing; 30 MHz to 18 GHz; LiNbO/sub 3/; YAG:Nd laser; YAl5O12:Nd; analog fiber optic links; anechoic chamber tests; broadband VHF/UHF antenna; broadband cavity-backed spiral antenna; dynamic range; electric field sensitivity; electro-optic techniques; environmental stability; externally modulated system; fibre-optic techniques; frequency response; high-speed photodiode; laser diode; optical waveguide modulator; remote multioctave EM field measurements; short-haul fibre-optic links; single-mode optical fiber; Antenna measurements; Broadband antennas; Electromagnetic fields; Electromagnetic measurements; Electromagnetic waveguides; High speed optical techniques; Optical modulation; Optical sensors; Optical waveguides; Semiconductor waveguides;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221835
