Fiber optic coupler exhibiting low nonadiabatic loss

Details Fiber optic coupler exhibiting low nonadiabatic loss Fiber optic coupler exhibiting low nonadiabatic loss

1994-05-05

1995-05-02

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling structure

385 51, 385127, G02B 626

Patent

active

054127459

ABSTRACT:
A fiber optic coupler comprising a plurality of single-mode optical fibers, each of which is tapered to form a small diameter section that extends in contiguous relationship with the small diameter sections of the other fibers to form a coupling region. Each of the fibers has a core surrounded by a cladding of refractive index lower than that of the core. At least one of the fibers has a refractive index pedestal of refractive index n.sub.i between said core and cladding, wherein n.sub.1 >n.sub.i >n.sub.2, n.sub.1 and n.sub.2 being the refractive indices of the core and cladding, respectively.

REFERENCES:
patent: 4763976 (1988-08-01), Nolan et al.
patent: 4795228 (1989-01-01), Schneider
patent: 4877300 (1989-10-01), Newhouse et al.
patent: 5179603 (1993-01-01), Hall et al.
patent: 5268979 (1993-12-01), Weidman
W. J. Stewart et al. "Design Limitation on Tapers and Couplers in Single-Mode Fibres", Technical Digest, Fifth International Conference on Integrated Optics & Optical Fiber Communication and Eleventh European Conference on Optical Communication, Genoa, Italy, vol. 1, p. 559 (1985), 4 pp.

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