24 July 1998 Simulations of a multiple-core-fiber-based interferometer in the presence of noise
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Abstract
We present results of extensive simulation of the performance of an optical interferometer array based on a new fiber concept with closely spaced multiple cores symmetrically arranged inside a common cladding. While sharing the principal advantages of single-mode (SM) fibers, including spatial filtering of phase-corrupted light and lossless propagation, the multiple core (MC) fibers are predicted to have an enhanced coupling efficiency and comparable noise sensitivity for typical observing conditions of low light levels and moderate to strong turbulence. Moreover, MC fibers have unique practical advantages: by presenting a larger face, they permit relatively easy focusing of light into the fiber, and they are well studied to purely fiber-based beam splitting and beam recombination, making it possible to construct an all- fiber interferometer with reduced complexity and cost. Our simulations of the MC fiber-linked interferometer array encompass a variety of conditions of atmospheric turbulence and photon-counting noise, for observations of a monochromatic point source. We compare the result from simulation to predictions from previous detailed theoretical calculations. Comparisons are made to an interferometer linked with standard SM fibers. We find that the coupling efficiency and sensitivity of the simulated interferometer using MC fibers generally agrees with theoretical predictions. Efforts to manufacture mC fibers are also reviewed.
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Carl E. Tuttle, Carl E. Tuttle, Sudhakar Prasad, Sudhakar Prasad, } "Simulations of a multiple-core-fiber-based interferometer in the presence of noise", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317096; https://doi.org/10.1117/12.317096
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