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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 17, Iss. 21 — Nov. 1, 1978
  • pp: 3466–3471

Signal-to-noise ratio in optical heterodyne detection for Gaussian fields

Takashi Takenaka, Kazumasa Tanaka, and Otozo Fukumitsu  »View Author Affiliations


Applied Optics, Vol. 17, Issue 21, pp. 3466-3471 (1978)
http://dx.doi.org/10.1364/AO.17.003466


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Abstract

The signal-to-noise ratio of optical heterodyne detection is discussed for Gaussian fields. The ratio of the aperture radius a of the detector to the smallest spot size ws of the signal has serious effects on the SNR. The conditions that maximize the SNR are obtained for a given signal or local oscillator field. The effects of field mismatching or misalignment are also discussed. Numerical analyses show that when such mismatching or misalignment exists, the spot size of the local oscillator field should be larger than that of the signal with a ratio of a/ws ≃ 1.2. Then the heterodyne efficiency is rather insensitive to the errors and yet takes reasonable values (above 0.8).

© 1978 Optical Society of America

History
Original Manuscript: January 18, 1978
Published: November 1, 1978

Citation
Takashi Takenaka, Kazumasa Tanaka, and Otozo Fukumitsu, "Signal-to-noise ratio in optical heterodyne detection for Gaussian fields," Appl. Opt. 17, 3466-3471 (1978)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-17-21-3466


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