Minimization of fiber dispersion effects in double Fourier stellar interferometers.

Details Minimization of fiber dispersion effects in double Fourier stellar interferometers. Minimization of fiber dispersion effects in double Fourier stellar interferometers.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..278c&link_type=abstract

Astronomy and Astrophysics 293, 278-286 (1995)

Astronomy and Astrophysics

Astrophysics

8

Instrumentation: Interferometers, Infrared: General

Scientific paper

One of the problems encountered when using single-mode fibers in a wide band interferometer is the dispersion of the waveguide. We relate here the phase curvature of the interferograms with the dispersion parameter of the fiber. Total dispersion in a fiber is the sum of material and waveguide dispersion. By optimizing the waveguide structure for an actual fluoride glass, we show that a fiber can be made whose dispersion between 2μm and 2.7μm is reduced by more than two orders of magnitude. Simulated interferograms show that an interferometer using such a fiber could withstand a fiber length difference of 10m without a substantial degradation of its performances. This raises the possibility to consider all-fiber delay lines with several meters of optical path delay variation.

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