Fiber optic polarization maintaining fused coupler fabricating a

Details Fiber optic polarization maintaining fused coupler fabricating a Fiber optic polarization maintaining fused coupler fabricating a

1991-12-09

1993-09-14

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022717, G01N 2184, G01N 2121

Patent

active

052454002

ABSTRACT:
A fiber optic polarization maintaining apparatus for use in fabrication of fused optical couplers, where the fused optical couplers include first and second optical fibers which each have a principle axis. A light launching source is coupled through a lens into a first end of a selected one of the first and second optical fibers. A piezoelectric element in combination with a solenoid applies external stress in the form of an AC modulation signal to the selected one of the first and second optical fibers. A rotating apparatus rotates the selected one of the first and second optical fibers during modulation. Apparatus for collimating light is coupled to a second end of the selected fiber. Apparatus for analyzing the collimated light is coupled to the collumating apparatus, apparatus for detecting power is coupled to the analyzing means, and an output of the power detecting apparatus is coupled to an apparatus for determining when the principle axis of the selected fiber is aligned in the direction of the externally applied stress by detecting a null output from the power detecting apparatus.

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patent: 4992122 (1991-02-01), Rayit
patent: 4997247 (1991-03-01), Stowe
Chinone et al., "Elasto-optic polarization measurement in Optical Fiber", Optics Letters/vol. 6, No. I, Jan. 1981, pp. 16-18.
S. L. A. Carrara, B. Y. Kim and H. J. Shaw, "Elasto-optic alignment of birefringent axes in polarization-holding optical fiber", Jul. 1986, pp. 470-472.

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