Coherent ranging beyond coherence length using multiple delay lines

Min Uk Jung; Gyeong Hun Kim; Chang-Seok Kim

doi:10.1117/12.2650981

9 March 2023 Coherent ranging beyond coherence length using multiple delay lines

Min Uk Jung, Gyeong Hun Kim, Chang-Seok Kim

Proceedings Volume PC12428, Photonic Instrumentation Engineering X; PC124280C (2023) https://doi.org/10.1117/12.2650981
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Coherent ranging is widely used as an optical method to measure a distance from a very fine area to a very wide area. Since distance measurement depends on light interference, a limitation occurs in the coherence length of a laser source light. We attempted to overcome this problem by creating multiple delay lines for each wavelength using a fiber Bragg grating (FBG) reflector in the interferometer. Using the proposed method, it is possible to measure the extended longer distance by using the conventional laser with a short coherence length.

Conference Presentation

Citation Download Citation

Min Uk Jung, Gyeong Hun Kim, and Chang-Seok Kim "Coherent ranging beyond coherence length using multiple delay lines", Proc. SPIE PC12428, Photonic Instrumentation Engineering X, PC124280C (9 March 2023); https://doi.org/10.1117/12.2650981

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