Optical fibre spot size determination apparatus

Details Optical fibre spot size determination apparatus Optical fibre spot size determination apparatus

1983-12-23

1986-05-06

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

045868166

ABSTRACT:
Apparatus for measuring the spot size of light emerging from an optical fibre comprises a rotating radial grating which is moved relative to a monochromatic beam of light, passing through the fibre, to vary the spatial frequency of the light entering a photodetector situated at the output end of the optical fibre, thereby obtaining a variation in the modulation amplitude of the light received by the detector, allowing measurement of the spot size to be obtained.

REFERENCES:
patent: 3379891 (1968-04-01), Aroyan
patent: 3612885 (1971-10-01), Arnaud
Streckert, "New Method for Measuring the Spot Size of Single-Mode Fibers" Optics Letters, vol. 5, #12, Dec. 1980, pp. 505-506.
IEEE Journal of Quantum Electronics, vol. QE18, No. 10, pp. 1451-1466, W. J. Stewart, "Optical Fiber & Preform Profiling Technology" published Oct. 1982.

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