Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1985-10-07
1986-09-16
Bashore, S. Leon
Glass manufacturing
Processes
Forming product or preform from molten glass
65 43, 65 31, C03B 2320
Patent
active
046120289
ABSTRACT:
A polarization-preserving single mode fiber coupler, fabricated by a method which does not require mutually aligning the fiber polarization axes provided the actual misalignment angle is not close to 90.degree.. The protective jackets from two or more polarization-preserving single mode birefringent fibers are partially removed and the fibers are twisted around each other to bring them into contact over the jacketless region and provide a coupling length that is large compared to the birefringent beat length of the fibers. Next, the cladding layers of the fibers in the contacting region are partially etched without degrading the birefringent beat length over their coupling length. Then, the etched region is heated to the softening point of the fibers while axial tension is applied to taper and fuse the etched region until a desired coupling of the fibers is achieved. Finally, a mechanical supporting structure is added to the tapered and fused region of the fibers.
REFERENCES:
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patent: 4426215 (1984-01-01), Murphy
patent: 4439221 (1984-03-01), Smyth et al.
Namihira et al, "Birefringence in Elliptical-Cladding Single-Polarisation ber", Electronics Letters, 1/21/82, vol. 18, pp. 90-92.
M. Kawachi et al. "Fabrication of Single-Polarisation Single-Mode Fibre Couplers" Elec. Lett. vol. 18, p. 962.
C. A. Villarruel et al. "Fused Single Mode Fibre Access Couplers" Elec. Lett. vol. 17, p. 243.
T. Katsuyama et al. "Low-Loss Single-Polarisation Fibres" Elec. Lett. vol. 17, p. 473.
B. S. Kawasaki, et al., "Biconical-Taper Single-Mode Fiber Coupler", Optics Lett., vol. 6, p. 327.
Abebe Moges
Burns William K.
Villarruel Carl A.
Adams Robert W.
Bashore S. Leon
Beers Robert F.
Boyer Michael K.
Hiskes Edward V.
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