Beat frequency nonlinearity compensation based on fiber reference channel in laser frequency scanning interferometer

Xinke Xu; Guodong Liu; Bingguo Liu; Fengdong Chen; Zhitao Zhuang; Yu Gan; Cheng Lu

doi:10.1117/12.2199699

8 October 2015 Beat frequency nonlinearity compensation based on fiber reference channel in laser frequency scanning interferometer

Xinke Xu, Guodong Liu, Bingguo Liu, Fengdong Chen, Zhitao Zhuang, Yu Gan, Cheng Lu

Author Affiliations +

Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 96771L (2015) https://doi.org/10.1117/12.2199699
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

High resolution and simple device ranging technology has prospects of broad application and attractive. Laser frequency scanning interferometer has capability of high-resolution, low-noise ratio measurement. The tuning nonlinearity is a main factor limited to the ranging resolution which needs to be corrected. When using hardware to correct laser tuning nonlinearity, it would increases the complexity of the instrument structure. For the purpose of making structure of the instrument much simple, we proposed a method that using fiber reference channel to compensate the nonlinearity of measurement path beat frequency, which can achieve high resolution measurement. The method require obtaining the reference and measurement path beat signal simultaneously, then extracting the phase of the reference channel signal which is formed by fiber end face to compensate the nonlinearity of measurement signal. Hilbert transform is used to calculate the phase of signal, and empirical mode decomposition (EMD) method is used to reduce the noise of reference signal. The laser frequency scanning interferometer is demonstrated by experiment, we show that this performance enables 132μm for 10nm tuning bandwidth over several meter range. The method does not need to estimate the tuning nonlinearity function, so it could reduce the complexity of algorithm.

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Xinke Xu, Guodong Liu, Bingguo Liu, Fengdong Chen, Zhitao Zhuang, Yu Gan, and Cheng Lu "Beat frequency nonlinearity compensation based on fiber reference channel in laser frequency scanning interferometer", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96771L (8 October 2015); https://doi.org/10.1117/12.2199699

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KEYWORDS

Phase measurement

Interferometers

Fiber lasers

Ranging

Interference (communication)

Calibration

Optical testing

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