Process and apparatus for measuring an evanescent field in an op

Details Process and apparatus for measuring an evanescent field in an op Process and apparatus for measuring an evanescent field in an op

1983-10-28

1988-02-16

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

047251379

ABSTRACT:
An apparatus and process are described which can measure the strength of an evanescent field at the surface of an optical fiber. Light is injected into an end of the optical fiber while the portion of the fiber to be tested is contacted with a material having a higher index of refraction than the optical fiber. The amount of light lost, i.e., coupled out of the fiber, is a function of the evanescent field strength at the cladding surface of the optical fiber. This loss can be correlated with optical fibers which have thicker and thinner claddings to determine the thickness of the cladding and/or the extent of removal of the cladding by, for example, etching.

REFERENCES:
patent: 4387954 (1983-06-01), Beasley
patent: 4536058 (1985-08-01), Shaw et al.

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