Calibration method for frequency scanning interferometry distance measurement system using dispersive interferometry

Qiang Zhou; Tengfei Wu; Jiarui Lin; Xu Liang; Zhoumo Zeng

doi:10.1117/12.2610873

8 July 2022 Calibration method for frequency scanning interferometry distance measurement system using dispersive interferometry

Qiang Zhou, Tengfei Wu, Jiarui Lin, Xu Liang, Zhoumo Zeng

Author Affiliations +

Proceedings Volume 12282, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 1228206 (2022) https://doi.org/10.1117/12.2610873
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

The long delay optical fiber is the length reference in the frequency scanning interferometry (FSI) distance measurement system, which is directly related to the stability of the system. This paper proposes a calibration method for the optical path difference (OPD) of long optical fiber. In this scheme, the optical frequency comb (OFC) is introduced into the measurement system, and the dispersive interferometry is used to complete the measurement of the OPD of the fiber. The light generated by the tunable laser and the light generated by OFC are led to the long optical fiber using a fiber coupler at the same time, which ensures the common path design of the calibration system and the measurement reference. The dispersive interferometry signal is detected by an optical spectrum analyzer. Experiments were designed to verify the repeatability of this calibration method. Experimental results show that using dispersion interferometry to calibrate the OPD of the fiber can achieve a relative accuracy lower than 10^-7.

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Qiang Zhou, Tengfei Wu, Jiarui Lin, Xu Liang, and Zhoumo Zeng "Calibration method for frequency scanning interferometry distance measurement system using dispersive interferometry", Proc. SPIE 12282, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 1228206 (8 July 2022); https://doi.org/10.1117/12.2610873

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KEYWORDS

Calibration

Interferometry

Interferometers

Signal detection

Distance measurement

Frequency combs

Optical fibers

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