1983-12-05
1984-10-02
Sikes, William L.
350 9616, G02B 5172
Patent
active
044744315
ABSTRACT:
An optical fibre directional coupler has first and second optical fibres clamped together by a piece of low index heat-shrunk tubing 12. The first fibre consists solely of a core 10 and cladding 11 while the second has a core 13 a primary cladding 14 whose cross-sectional area is larger than that of the core, and a secondary cladding 15. The outermost layer of each fibre is absent over a portion of its length within the tubing 12 so that the core 10 of the first is in intimate contact with the primary cladding 14 of the second. The second fibre may have a mode stripper 45 to strip modes guided by the primary/secondary cladding interface. Fibre break detection apparatus and a single-fibre two-way transmission system are described which use such directional couplers.
REFERENCES:
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patent: 4054366 (1977-10-01), Barnoski et al.
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patent: 4289373 (1981-09-01), Sugimoto et al.
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Applied Optics, vol. 17, No. 13, Jul. 1, 1978, pp. 2077-2079, Ogawa et al., "Multimode Fiber Coupler".
Applied Optics, vol. 16, No. 7, Jul. 1977, pp. 1794-1795, Kawasaki et al., "Low Loss Access Coupler for Multimode Optical Fiber Distribution Networks".
Gonzalez Frank
International Standard Electric Corporation
O'Halloran John T.
Ruzek Peter R.
Sikes William L.
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