Optical fiber coupler and method for preparing same

Details Optical fiber coupler and method for preparing same Optical fiber coupler and method for preparing same

1994-01-25

1995-04-04

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling structure

385 51, G02B 626

Patent

active

054044154

ABSTRACT:
In an optical fiber coupler comprising a plurality of optical fibers bundled together and a light-coupling portion which is formed by partially fusing and drawing these bundled fibers and which permits branching of light rays incident upon one of these fibers into the other fibers at a predetermined branching ratio, the optical fiber coupler has a difference between the branching ratio thereof determined immediately after the fusing and drawing operation and that determined after accommodating the coupler in a protective case and then adhering it to the case, equal to or less than 5%. Such an optical fiber coupler can be produced by bundling a plurality of optical fibers 1 and 2, fusing and drawing a part of the bundled optical fibers with heating, fixing the relative positions of these optical fibers 1 and 2 immediately after the fusing and drawing operation and then accommodating in and fixing to a protective case. If the foregoing difference in the branching ratio is not more than 5%, the difference between the branching ratios determined after the fusing and drawing operation and determined after the coupler is subjected to a thermal shock test is reduced to a level of not more than 2%. Therefore, the coupler does not suffer from any substantial change in properties even after the thermal shock test and thus can practically be used with high reliability.

REFERENCES:
patent: 4822128 (1989-04-01), Imoto et al.
patent: 5009478 (1991-04-01), Sasaki et al.
patent: 5208883 (1993-05-01), Hattori et al.
patent: 5309536 (1994-05-01), Suganuma et al.

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