Fiber optic couplers, preform and method of making same

Details Fiber optic couplers, preform and method of making same Fiber optic couplers, preform and method of making same

1995-12-05

1997-01-14

Healy, Brian

Optical waveguides

With optical coupler

Particular coupling structure

385 42, 385 50, 385 51, 385 96, 385 99, 65385, 65406, 65408, 65409, G02B 626, C03B 37023

Patent

active

055948227

ABSTRACT:
Overclad fiber optic couplers are made by inserting the uncoated portions of a plurality of optical fibers into the bore of a glass tube, collapsing the tube midregion onto the fibers and stretching the central portion of the tube midregion. The present method utilizes a glass tube the bore of which includes a circular portion and a recess. A plurality of optical fibers are sequentially inserted into the tube by threading the coated end into the circular bore portion until the uncoated portion of fiber is centered in the tube. The uncoated portion of fiber is then transferred laterally into the bore recess. After all fibers have been threaded into the circular bore portion and transferred to the recess, a filler fiber is inserted into the circular bore portion. The resultant coupler exhibits low excess loss.

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