Directional coupler

Details Directional coupler Directional coupler

1987-03-31

1989-01-31

Sikes, William L.

350 9629, G02B 602, G02B 626

Patent

active

048011851

ABSTRACT:
A fused tapered optical fibre directional coupler for use in a polarisation-preserving fibre system has a short stub length of non-polarisation-preserving fibre spliced into each fibre from which the coupler is made. The reduced diameter and tapered portions of the coupler are confined to the stub lengths since it is found that low loss coupling is not achieved if these portions are fabricated in fibre with a polarisation-preserving structure.

REFERENCES:
patent: 4330170 (1982-05-01), Johnson
patent: 4457581 (1984-07-01), Johnson et al.
patent: 4591372 (1986-05-01), Bricheno et al.
patent: 4632513 (1986-12-01), Stowe et al.
B. S. Kawasaki et al, "Low-Loss Access Coupler for Multimode Optical Fiber Distribution Networks", Applied Optics, vol. 16, No. 7, 1977.
B. S. Kawasaki et al, "Biconical-Taper Single-Mode Fiber Coupler", Optics Letters, vol. 6, No. 7, Jul. 1981.
Electronics Letters, vol. 21, No. 6, Mar. 1985, pp. 249-251, M. S. Yataki et al., "All-Fibre Polarizing Beamsplitter".
IEE Proceedings vol. 132, part J, No. 5, Oct. 1985, pp. 297-302, G Georgiou et al., "Low-Loss Single-Mode Optical Couplers".
Electronics Letters vol. 19, No. 16, 4th Aug. 1983, p. 601, R. B. Dyott et al., "Polarisation-Holding Directional Couplers Made From Elliptically Cored Fibre Having a D Section".

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