Optical fibre measurement

Details Optical fibre measurement Optical fibre measurement

1991-05-21

1992-11-10

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

250228, G01N 2184, G01N 2159

Patent

active

051628643

ABSTRACT:
Signal attenuation caused by a coating on an optical fibre is measured by feeding a length of the coated optical fibre into an integrating sphere assembly, forming within that part of the fibre within the sphere a loop of such a diameter that there is no risk of macrobending of the fibre and feeding the optical fibre out of the sphere to a detector. Light from a source is transmitted through the fibre and the power of the transmitted signal is continuously detected. The diameter of the loop is gradually decreased to cause macrobending of the fibre F and the strength of the light radiated through the coating by the macrobend in the fibre and collected and integrated by the sphere is monitored. The attenuation by the coating of the transmitted signal is determined from the discrepancy between the reduction of power of the transmitted signal and the increase in strength of the light radiated through the coating by the macrobend.

REFERENCES:
patent: 4360268 (1982-11-01), Zucker et al.
patent: 4659215 (1987-04-01), Sumida et al.

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