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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 18 — Aug. 31, 2009
  • pp: 15641–15651

Real-time digital signal processing for live electro-optic imaging

Kiyotaka Sasagawa, Atsushi Kanno, and Masahiro Tsuchiya  »View Author Affiliations

Optics Express, Vol. 17, Issue 18, pp. 15641-15651 (2009)

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We present an imaging system that enables real-time magnitude and phase detection of modulated signals and its application to a Live Electro-optic Imaging (LEI) system, which realizes instantaneous visualization of RF electric fields. The real-time acquisition of magnitude and phase images of a modulated optical signal at 5 kHz is demonstrated by imaging with a Si-based high-speed CMOS image sensor and real-time signal processing with a digital signal processor. In the LEI system, RF electric fields are probed with light via an electro-optic crystal plate and downconverted to an intermediate frequency by parallel optical heterodyning, which can be detected with the image sensor. The artifacts caused by the optics and the image sensor characteristics are corrected by image processing. As examples, we demonstrate real-time visualization of electric fields from RF circuits.

© 2009 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(230.2090) Optical devices : Electro-optical devices
(350.4010) Other areas of optics : Microwaves
(100.0118) Image processing : Imaging ultrafast phenomena
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Image Processing

Original Manuscript: July 7, 2009
Revised Manuscript: August 2, 2009
Manuscript Accepted: August 7, 2009
Published: August 19, 2009

Kiyotaka Sasagawa, Atsushi Kanno, and Masahiro Tsuchiya, "Real-time digital signal processing for live electro-optic imaging," Opt. Express 17, 15641-15651 (2009)

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  1. K. Sasagawa, A. Kanno, T. Kawanishi, and M. Tsuchiya, "Live electro-optic imaging of microwave near-fields via ultra-parallel photonic heterodyne," IEEE 2007 MTT-S International Microwave Symposium Digest, 401-404 (2007).
  2. K. Sasagawa, A. Kanno, T. Kawanishi, and M. Tsuchiya, "Live electro-optic imaging system based on ultraparallel photonic heterodyne for microwave near-fields," IEEE Trans. Microwave Theory Tech. 55,2782-2791 (2007). [CrossRef]
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