Process and apparatus for measuring the effective diameter of th

Details Process and apparatus for measuring the effective diameter of th Process and apparatus for measuring the effective diameter of th

1982-10-12

1986-01-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

045654450

ABSTRACT:
A process and apparatus for measuring the effective diameter of the guided mode of a monomode optical fibre. The apparatus utilizes a lighting source such as a tungsten filament or a quartz-halogen lamp in conjunction with a monochromator for selecting light of wavelength .gamma. from the lamp, as well as a variable aperture lens. The imaging of the source is performed on the input face of the fibre by means of the lens with the image having a size greater than the diameter of the fibre core. The light from the source falls on the fibre in accordance with a cone having an apex halfangle .phi.. The lighting power P(.phi.) transmitted by the fibre as measured as a function of (.phi.) and the effective diameter 2w.sub.0 is determined in accordance with a disclosed formula.

REFERENCES:
"Fiber Optics", N. S. Kapan, pp. 160-163.
Review of Scientific Instruments, vol. 53, No. 2, Feb. 1982.
Alard et al., "Fundamental Mode Spot-Size Measurement in Single-Mode Optical Fibres", Electronics Letters, Dec. 10, 1981, vol. 17, #25, pp. 958-960.

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