Optical waveguides – Accessories
Patent
1995-03-21
1996-10-29
Ngo, John
Optical waveguides
Accessories
385 99, 385147, G02B 636
Patent
active
055704492
ABSTRACT:
A holder for annealing a fiber optic coil uses a silica ring on a silica substrate, or silica tubular coil, either of which may be directly incorporated into a coil subassembly for a Faraday-effect current sensor. The ring may be formed in a silica plate by sandblasting or grinding, or formed separately and adhered to the plate. In the tubular holder embodiment, silica tubes and sleeves are used to protect fusion splices between the ends of the fiber coil and polarizing fibers. Use of silica for most of the subassembly components matches the coefficients of thermal expansion of the subassembly to that of the fiber coil, and also allows the coil to be annealed at extremely high temperatures. Annealing yields fiber coils of lowered birefringence, particularly when used with spun fibers. Ferrules are used to adjust the angular orientation of the fibers with respect to their planes of polarization.
REFERENCES:
patent: 4298245 (1981-11-01), Aulich et al.
patent: 4505540 (1985-03-01), Furusawa et al.
patent: 4802724 (1989-02-01), Fraize et al.
patent: 4961623 (1990-10-01), Midkiff et al.
patent: 5153931 (1992-10-01), Buchanan et al.
patent: 5163988 (1992-11-01), Setaishi et al.
patent: 5189724 (1993-02-01), Hartley
Day et al; "annealing of bend-Induced Brirefringence in Fiber Current Sensors";; IOOC-ECOC, 1985, pp. 871-874.
Article entitled "Farday Effect Sensors: The State of the Art" by G. W. Day and A. H. Rose, National Bureau of Standards, Boulder, CO 80303, SPIE vol. 985, Fiber Optic and Laser Sensors VI (1988) pp. 138-150.
Hutchinson Ted F.
Lutz Dale R.
MacDougall Trevor W.
Onstott James R.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Musgrove Jack V.
Ngo John
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