Coupling starlight into single-mode fiber optics

Details Coupling starlight into single-mode fiber optics Coupling starlight into single-mode fiber optics

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27.2334s&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 27, June 1, 1988, p. 2334-2338.

Physics

Optics

50

Atmospheric Turbulence, Coupled Modes, Fiber Optics, Focal Plane Devices, Pupils, Stellar Luminosity, Computer Programs, Wave Fronts

Scientific paper

The efficiency with which starlight can be coupled into a single-mode fiber optic that is placed in the focal plane of a telescope has been calculated. The calculations are performed for a wide range of seeing conditions, with and without rapid image stabilization, and for a wide range of wavelengths. The dependence of coupling efficiency on the f-ratio of the incident beam is explored. Also, the coupling efficiency as a function of displacement for a perfect Airy pattern is calculated. A computer program is used which simulates atmospheric wavefronts to determine the variance of instantaneous coupling efficiency as a function of seeing. In perfect conditions, the maximum efficiency at the LP11 mode cutoff is 78 percent due to the mismatch of the Airy pattern and the nearly Gaussian mode of the fiber. Maximum total coupled power is attained at d/r(0) = 4 with rapid image stabilization.

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