Signal-feedback induced intensity modulation in a fibre optic gyro system

Author

Jin, W. ; Culshaw, B.

Author_Institution

Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK

Volume

139

Issue

5

fYear

1992

fDate

10/1/1992 12:00:00 AM

Firstpage

318

Lastpage

324

Abstract

The characteristics of signal-feedback-induced intensity modulation of a laser diode in a fibre optic gyro system is investigated theoretically and experimentally. The effect of the feedback is to induce an additional modulation term in the laser output which has the same waveform as the Sagnac signal and is amplified in amplitude (maximum 16 dB). The influence of this intensity modulation on the performance of a two-dimensional frequency-division multiplexed gyro system is to introduce additional terms sin 2φ_si and sin φ_si cos φ_sj if detection is at the first harmonic of the bias modulation of gyro i, where φ_si and φ_sj are Sagnac phase shifts in gyro i and gyro j, respectively

Keywords

amplitude modulation; feedback; fibre optic sensors; frequency division multiplexing; gyroscopes; light interferometers; optical modulation; semiconductor junction lasers; 2D; AM; Sagnac phase shifts; Sagnac signal; amplitude amplified signal; bias modulation; fibre optic gyro system; first harmonic; frequency-division multiplexed gyro system; interferometric Sagnac signal; laser diode; laser output; signal-feedback-induced intensity modulation; waveform;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings J

Publisher

iet

ISSN

0267-3932

Type

jour

Filename

166692