Method and apparatus for measuring single mode fiber mode field

Details Method and apparatus for measuring single mode fiber mode field Method and apparatus for measuring single mode fiber mode field

1985-11-06

1987-01-13

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

350449, 356225, G01N 2184

Patent

active

046360719

ABSTRACT:
The fundamental-mode field radius `w` is a key parameter in characterizing optical fibers. `w` is a function of P, .theta. and .lambda. where P is the far-field power passing through a circular aperture subtending a solid angle of 2.theta. at the fiber end face and .lambda. is the center wavelength of transmitted length. `w` is derived by moving a fixed diameter aperture along an axis extending between the test fiber end surface and a photodetector so as effectively to vary .theta.. At each location the power P incident on the photodetector and the corresponding acceptance angle .theta. are measured. A microprocesor is programmed to compute from the range of measured values of .theta. and P, the value of mode field radius for a particular transmission wavelength .lambda..

REFERENCES:
patent: 4565445 (1986-01-01), Alard et al.
patent: 4586816 (1986-05-01), Stewart

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