A differential low noise photodetector module and its application in high precision fiber optic gyroscope

Han Liu; Hai-cheng Yu; Wen-shuai Feng; Cui-hua Li

doi:10.1117/12.3007755

18 December 2023 A differential low noise photodetector module and its application in high precision fiber optic gyroscope

Han Liu, Hai-cheng Yu, Wen-shuai Feng, Cui-hua Li

Author Affiliations +

Proceedings Volume 12959, AOPC 2023: Laser Technology and Applications; and Optoelectronic Devices and Integration; 129590W (2023) https://doi.org/10.1117/12.3007755
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

The photodetector module is a key optoelectronic device that converts the optical signal of the sensing optical path of FOG (Fiber Optic Gyroscope) into electrical signal and amplifies the weak signal, which greatly affects the accuracy and performance of FOG. High precision FOG requires detector components with low noise, high sensitivity, high responsiveness and wide dynamic range. In this paper, the zero voltage and the noise voltage of the traditional detector module are analyzed, and a new detector design scheme is proposed. The photovoltaic operating mode is selected and the signal is processed by difference. At the same time, the noise such as dark current is suppressed by controlling the temperature. The test results show that the variation of the zero voltage at full temperature (- 50°C～75°C) of the new detector assembly is reduced from 50 mV to no more than 3 mV, and the noise voltage is reduced from 0.8mV to 0.5mV. In practical application, the random walk coefficient of the high-precision FOG is reduced by 17.3%, and the full temperature bias stability is improved by 32.6%. The new detector assembly is of great significance for improving the accuracy and full temperature performance of the high-precision FOG.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Han Liu, Hai-cheng Yu, Wen-shuai Feng, and Cui-hua Li "A differential low noise photodetector module and its application in high precision fiber optic gyroscope", Proc. SPIE 12959, AOPC 2023: Laser Technology and Applications; and Optoelectronic Devices and Integration, 129590W (18 December 2023); https://doi.org/10.1117/12.3007755

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KEYWORDS

Fiber optic gyroscopes

Photodetectors

Interference (communication)

Dark current

Signal to noise ratio

Photovoltaics

Photodiodes

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