Method and apparatus for measuring single mode fiber mode...

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

G - Physics

01

N

73/55

G01N 21/25 (2006.01) G01M 11/00 (2006.01) G01N 21/59 (2006.01) G01J 1/06 (2006.01)

Patent

CA 1245072

METHOD AND APPARATUS FOR MEASURING SINGLE MODE FIBER MODE FIELD RADIUS Abstract of the Disclosure 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 20 at the fiber end face and .lambda. is the center wavelength of transmitted light. '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.. - i -

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