Measurement method of non-circularity of core optical fiber...

Details Measurement method of non-circularity of core optical fiber... Measurement method of non-circularity of core optical fiber...

2005-03-18

2009-12-15

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

C250S559240

Reexamination Certificate

active

07633608

ABSTRACT:
A method for measuring non-circularity of a core part of an optical fiber base material having the core part and a clad part includes immersing the optical fiber base material in liquid having a refractive index substantially equal to that of the clad part of the optical fiber base material; irradiating parallel light from a side face of the optical fiber base material to measure intensity distribution of transmitted light; measuring a width of a dark space caused by light passing the core part on intensity distribution to obtain a relative value for a core diameter; rotating the optical fiber base material to further obtain the relative value for the core diameter at plural points for a circumferential direction; and obtaining non-circularity of the core part based on the obtained plurality of relative values for the core diameter.

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