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
Slovenian 
English