New Method for Path-length Equalization of Long Single-mode Fibers for Interferometry

Abstract:The ability to use single mode (SM) fibers for beam transport in optical interferometry offers practical advantages over conventional long vacuum pipes. One challenge facing fiber transport is maintaining constant differential path length in an environment where environmental thermal variations can lead to cm-level variations from day to night. We have fabricated three composite cables of length 470 m, each containing 4 copper wires and 3 SM fibers that operate at the astronomical H band (1500-1800 nm). Multiple fibers allow us to test performance of a circular core fiber (SMF28), a panda-style polarization-maintaining (PM) fiber, and a lastly a specialty dispersion-compensated PM fiber. We will present experimental results using precision electrical resistance measurements of the of a composite cable beam transport system. We find that the application of 1200 W over a 470 m cable causes the optical path difference in air to change by 75 mm (+/- 2 mm) and the resistance to change from 5.36 to 5.50 {\Omega}. Additionally, we show control of the dispersion of 470 m of fiber in a single polarization using white light interference fringes ({\lambda}c=1575 nm, {\Delta}{\lambda}=75 nm) using our method.

This is a preprint of a paper originally published in Proceedings of SPIE in 2014. 11 pages, 11 figures

Optics (physics.optics); Instrumentation and Methods for Astrophysics (astro-ph.IM); Quantum Physics (quant-ph)

arXiv:2609.10771 [physics.optics]

(or arXiv:2609.10771v1 [physics.optics] for this version)

https://doi.org/10.48550/arXiv.2609.10771 arXiv-issued DOI via DataCite (pending registration)

Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014)

https://doi.org/10.1117/12.2057289 DOI(s) linking to related resources