This paper describes the design of an all-fiber scanning interferometer. The main component of the system is a thermoelectric cooler that can rapidly heat or cool several meters of optical fiber. Over 4 cm variation of optical path length is achieved with a scanning speed exceeding 12 mm/s. The system does not include any moving parts and has low insertion loss.
https://www.sciencedirect.com/science/article/pii/S0143816604002295
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