Achromatic overclad fiber optic coupler

Details Achromatic overclad fiber optic coupler Achromatic overclad fiber optic coupler

1994-03-25

1996-01-02

Gonzalez, Frank

Optical waveguides

With optical coupler

Particular coupling structure

385 43, 385 46, 385 48, 385 51, 385126, 385127, G02B 626

Patent

active

RE0351385

ABSTRACT:
An achromatic fiber optic coupler of the type wherein a plurality of single-mode optical fibers, each having a core and a cladding, are fused together along a portion of the lengths thereof to form a coupling region. The propagation constants of the fibers are preferably equal; however if the fiber claddings have different refractive indices, the lowest cladding refractive index is n.sub.2. A matrix glass body of refractive index n.sub.3 surrounds the coupling region, n.sub.3 being lower than n.sub.2 by such an amount that the value of .DELTA..sub.2-3 is less than 0.125%, wherein .DELTA..sub.2-3 equals (n.sub.2.sup.2- n.sub.3.sup.2)2n.sub.2.sup.2.

REFERENCES:
patent: 4763976 (1988-08-01), Nolan et al.
patent: 4763977 (1988-08-01), Kawasaki et al.
patent: 4773924 (1988-09-01), Berkey
patent: 4799949 (1989-01-01), Keck et al.
patent: 4877300 (1989-10-01), Newhouse et al.
patent: 4986620 (1991-01-01), Severijns et al.
patent: 5011251 (1991-04-01), Miller et al.
patent: 5044716 (1991-09-01), Berkey
patent: 5058978 (1991-10-01), Kondoh et al.

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