Method of limiting coupling losses between monomode optical fibe

Details Method of limiting coupling losses between monomode optical fibe Method of limiting coupling losses between monomode optical fibe

1992-09-15

1994-08-09

Healy, Brian

Optical waveguides

With optical coupler

Particular coupling function

385 31, 385 43, 385 95, 385 96, 65407, 65403, G02B 626, C03B 2320

Patent

active

053373804

ABSTRACT:
The present invention relates to a method of limiting coupling losses between a monomode optical fiber (2) having a mode diameter of W.sub.o, and an optical system (1) having a mode diameter W'.sub.o that is different from W.sub.o, said method being characterized by the fact that a piece (4) of multimode fiber is welded onto the end of said monomode fiber, said piece of multimode fiber having a length in the range 0.1 mm to 5 mm, and having the same cladding outside diameter as said monomode fiber, a mode diameter substantially equal to W'.sub.o, and an index difference .delta.n lying in the range 5.times.10.sup.-3 to 50.times.10.sup.-3, the weld creating an adiabatic cone in the region where the cores meet.

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Patent Abstracts of Japan, vol. 7, No. 282 (P-243)(1427) Dec. 16, 1983 & JP-A-58 158 620 (Hitachi) (Matsumoto).

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