Displacement Measurement Using Two-Photon Absorption Process in Si-Avalanche Photodiode and Fiber Bragg Gratings

This paper proposes a displacement measurement system using two-photon absorption (TPA) process in a Si-avalanche photodiode and fiber Bragg gratings (FBGs). The use of TPA process eliminates high-frequency and complicated RF circuits usually required for intensity correlation measurements. By contr...

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Bibliographic Details
Published in:Journal of lightwave technology 2018-02, Vol.36 (4), p.1192-1196
Main Authors: Tanaka, Yosuke, Nemoto, Masaya, Yamada, Yoshiki
Format: Article
Language:English
Subjects:
Bragg gratings
Correlation analysis
Displacement measurement
Photon absorption
Photon avalanches
Radio frequency
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Summary:This paper proposes a displacement measurement system using two-photon absorption (TPA) process in a Si-avalanche photodiode and fiber Bragg gratings (FBGs). The use of TPA process eliminates high-frequency and complicated RF circuits usually required for intensity correlation measurements. By controlling the phase difference between the modulation signals for probe and reference light, the displacements of FBGs are precisely measured. Small displacement of an FBG by 0.4 mm was successfully measured in the proof-of-concept experiment.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2017.2760890