Directional coupler for coupling single-polarization optical fib

Details Directional coupler for coupling single-polarization optical fib Directional coupler for coupling single-polarization optical fib

1984-04-18

1988-06-28

Lee, John

350 9633, 350320, G02B 626

Patent

active

047534974

ABSTRACT:
A directional coupler for coupling two single-polarization optical fibers each comprising a core, a cladding, and an elliptic jacket having a major axis is made by preparing two quartz substrates each of which is formed with a channel on one major surface; embedding and bonding the jacketed single-polarization optical fibers in the channels in the substrates, respectively, such that the major axis of the elliptic jacket extends perpendicular to the substrate surface; abrading away the substrates together with the fiber embedded therein from the major surface to a depth where light traveling in the core of said fiber may leak out; placing one substrate on the other substrate with the abraded surfaces facing each other; and bonding the substrates to keep the cores in sufficiently close relation to establish evanescent wave coupling therebetween. A stress perpendicular to the major axis is preferably applied to the fiber.

REFERENCES:
patent: 4386822 (1938-06-01), Bergh
patent: 4426129 (1984-01-01), Matsumura et al.
patent: 4493528 (1985-01-01), Shaw et al.
patent: 4669814 (1987-06-01), Dyott
Schoner et al., "Novel Method for Making Single-Mode Optical Fibre Directional Couplers," Electronics Lett., vol. 18, No. 13, Jun. 1982, pp. 566-568.
Fourth International Conference on Integrated Optics and Optical Fiber Communication, Technical Digest, Jun. 27-30, 1983, Uetsuka et al.
(Japan) Electrical Society Meeting Data, "Sensor Device Using Single-Polarization Optical Fiber", May 26, 1983, pp. 31-39, Fujii et al.
(Japan) Applied Physics Society Meeting Data, "Directional Coupler for Coupling Single-Polarization Optical Fibers", Apr. 4-7, 1983, Uetsuka et al.

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