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

W. Jin; B. Culshaw

doi:10.1049/ip-j.1992.0055

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

W. Jin, B. Culshaw

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

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.

Original language	English
Pages (from-to)	318-324
Number of pages	7
Journal	IEE proceedings. Part J, Optoelectronics
Volume	139
Issue number	5
DOIs	https://doi.org/10.1049/ip-j.1992.0055
Publication status	Published - Oct 1992

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General Engineering

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10.1049/ip-j.1992.0055

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AB - 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 2φsi and sin φsi cos φsj if detection is at the first harmonic of the bias modulation of gyro i, where φsi and φsj are Sagnac phase shifts in gyro i and gyro j, respectively.

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

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