Optical fibers with a light absorbing coating

Details Optical fibers with a light absorbing coating Optical fibers with a light absorbing coating

1993-12-28

1995-01-10

Lee, John D.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385123, G02B 622

Patent

active

053815050

ABSTRACT:
Optical fibers having one or more polymeric coatings have been found to be sensitive to extraneous light arising either as incident light from outside the optical fiber or as light escaping the fiber at bends and being reflected back into the fiber by a coating acting as a secondary cladding. In either case the extraneous light intensity may be reduced by placing at least one light absorbing component in a coating. Where the light absorbing component is placed in a coating between the primary cladding of the optical fiber and the secondary cladding both sources of extraneous light may be reduced or eliminated. Particulate amorphous carbon is an effective light absorber because of the broad range of optical wavelengths absorbed and because of its efficiency of absorption (high extinction coefficient) over this range.

REFERENCES:
patent: 4334523 (1982-06-01), Spanoudis
patent: 4372648 (1983-02-01), Black
patent: 4637686 (1987-01-01), Iwamoto et al.
patent: 4678273 (1987-07-01), Vilhelmsson
patent: 5000541 (1991-03-01), DiMarcello et al.
patent: 5062687 (1991-11-01), Sapsford
patent: 5093880 (1992-03-01), Matsuda et al.
"Optical Fiber Communications", B. K. Tariyal and A. H. Cherin, Encyclopedia of Physical Science and Technology, vol. 9, pp. 605-629 (1987). (no month).
"Optical Fibers, Drawing and Coating", L. L. Blyler, Jr. and F. V. DiMarcello, ibid., pp. 647-657, (1987). (no month).

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