Title :
Live Electrooptic Imaging System Based on Ultraparallel Photonic Heterodyne for Microwave Near-Fields
Author :
Sasagawa, Kiyotaka ; Kanno, Atsushi ; Kawanishi, Tetsuya ; Tsuchiya, Masahiro
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Tokyo
Abstract :
We report on 100 x 100 pixel live electrooptic imaging (LEI), which is real-time imaging of electrical signals on a microwave circuit. The circuit´s electric near-fields can be depicted in real time on a display screen at video frame rates as high as 30 frames/s. This system is based on photonics technology in which electric near-fields are applied to an electrooptic crystal plate and a sensing light beam is modulated there. The frequency of modulation is down-converted by using a photonic heterodyne of large-scale parallelism, and the spatial pattern of the electrooptic modulation is detected with a high-speed image sensor. A digital signal processor is used to extract the frequency component of interest and to animate it on the display screen. As examples, we present live pictures of electric field pattern data acquired by the LEI system in a real-time manner.
Keywords :
digital signal processing chips; electro-optical modulation; frequency modulation; heterodyne detection; image sensors; microwave circuits; digital signal processor; display screen; electrical signals; electrooptic crystal plate; electrooptic modulation; frequency modulation; high-speed image sensor; light beam sensor; live electrooptic imaging; microwave circuit; microwave near-fields; photonics technology; real-time imaging; ultraparallel photonic heterodyne; Displays; Electrooptic modulators; Frequency; Microwave circuits; Microwave imaging; Microwave photonics; Optical modulation; Optoelectronic and photonic sensors; Photonic crystals; Pixel; Electromagnetic field imaging; electrooptic measurement; large-scale parallelism; photonic heterodyne; real-time imaging;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.909889