Fiberoptic in-line filter and technique for measuring the transm

Details Fiberoptic in-line filter and technique for measuring the transm Fiberoptic in-line filter and technique for measuring the transm

1993-02-24

1995-09-26

Limanek, Robert P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022711, 25022715, 25022718, G01N 2100, H01J 516, H01J 4014

Patent

active

054538270

ABSTRACT:
A technique for determining the existence and location of faults within an optical fiber is disclosed. The technique is accomplished through the use of fault detecting means such as an optical time domain reflectometer used in conjunction with an in-line optical filtering device which filters out selected wavelengths of optical radiation within an optical fiber. Specifically, the filtering device comprises two GRIN lenses placed along the optical path of the fiber such that light within the fiber is collimated by the first GRIN lens, and returned to the fiber by the second GRIN lens. The means of wavelength selection is achieved by an optical filter coating on the surface of at least of the GRIN lenses. The optical filter can be an edge pass filter, a band-pass filter, or an absorption filter. The invention provides for a broadband wavelength selection, which is not achieved by fused biconic type wavelength division multiplexers.

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