G - Physics – 02 – B
Patent
G - Physics
02
B
26/197, 88/97.5
G02B 6/24 (2006.01) G01D 5/34 (2006.01) G01J 9/02 (2006.01)
Patent
CA 1231568
Abstract of the Disclosure: In an optical fiber system comprising first and second polarization-maintaining fibers (41, 42), a first orthogonal coordinate of the first polarization-maintaining fiber is azimuthal- ly rotated relative to a second orthogonal coordinate of the second polarization-maintaining fiber by the use of an optical coupler (40) by a preselected angle between 0° and 90°, both exclusive. Preferably, the optical coupler is shorter than a beat length of each fiber and the preselected angle is equal to 45°. The optical fiber system is applicable to an optical sensor for sensing a variable physical parameter. In the sensor, a light beam is incident onto one end of the first polarization-maintaining fiber so that a plane of polarization of the light beam is matched to one of those planes of the first polarization-maintaining fiber which are determined by the first orthogonal coordinate. A third polarization-maintaining fiber is coupled through an additional optical coupler to the second polarization-maintaining fiber. The optical fiber system can be manufactured either by twisting and locally fusing a single polarization-maintaining fiber or by splicing two polarization-maintaining fibers. [Fig. 3]
437614
Fujii Yoshimasa
Koike Osamu
Mitsuhashi Yoshinobu
Agency Of Industrial Science And Technology Ministry Of International Trade And Industry
Hoya Corporation
Johnson Douglas S. Q.c.
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