Optical system coupling a rectangular light source to a circular

Details Optical system coupling a rectangular light source to a circular Optical system coupling a rectangular light source to a circular

1981-04-21

1983-11-01

Moore, David K.

350 9615, G02B 514

Patent

active

044127200

ABSTRACT:
A light source of rectangular outline, such as a semiconductor laser, is coupled to a light receiver of circular outline to be illuminated thereby, such as an end of an optical fiber, by an anamorphotic system including a pair of spherical lenses and an afocal pair of cylindrical lenses interposed in a telecentric field therebetween. When the system is used for measuring the attenuation of a fiber by the back-scattering technique, a semireflecting prism inserted between the cylindrical lenses and the fiber-side spherical lens directs part of the returning beam toward a photodetector; the effect of spurious reflections at the fiber end may be minimized by the use of a polarization-sensitive Glan prism and/or by the positioning of a flat transparent plate in front of the fiber end.

REFERENCES:
patent: 3977764 (1976-08-01), d'Auria et al.
patent: 4154529 (1979-05-01), Dyott

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