New monostatic balanced Doppler velocimeter using a high birefringence fiber

Author

Battig, R. ; Stierlin, Roland ; Henchoz, Pierre-david ; Weber, Heinz P.

Author_Institution

Inst. of Appl. Phys., Bern Univ., Switzerland

Volume

6

Issue

1

fYear

1988

fDate

1/1/1988 12:00:00 AM

Firstpage

8

Lastpage

11

Abstract

A novel fiber-optic Doppler velocimeter is presented. By suitably controlling the polarization state of the local oscillator, illuminating beam, and signal light, balanced mixing with a noise reduction of 30 dB as compared to unbalanced mixing can be realized. The remaining noise level is predominantly due to shot noise. Allowing for losses in the receiving optics and for nonperfect mixing efficiency, the minimum detectable signal power is estimated to be 10^-18 W-Hz^-1. The high sensitivity of the system is demonstrated by the detection of light scattered from a distant moving object

Keywords

Doppler effect; fibre optic sensors; optical losses; velocity measurement; balanced mixing; birefringence fiber; distant moving object; illuminating beam; light scattering; local oscillator; minimum detectable signal power; monostatic balanced Doppler velocimeter; noise reduction; nonperfect mixing efficiency; polarization state; sensitivity; shot noise; signal light; unbalanced mixing; Lighting control; Local oscillators; Noise level; Noise reduction; Optical fiber polarization; Optical losses; Optical mixing; Optical noise; Optical scattering; Optical sensors;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.3954

Filename

3954