Alcatel N.v.

Kabel Rheydt Aktiengesellschaft

Philippe Darbon

Emmanuel Grard

Hans-Detlef Leppert

Frank Lisse

Manuela Hahn

Hans-J Urgen Lysson

A method for manufacturing an optical fiber (11), wherein the fiber (11) is drawn from one end of a preform (9) which is heated to above the glass softening temperature. The preform (9) is surronded by a protective gas (14) whose flow direction corresponds to the fiber drawing direction. The flow of the gas surrounding the preform (9) in the drawing area (10) is stabilized by an additional flushing gas (16).

Method and device for manufacturing an optical fiber

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.

Method of limiting coupling losses between monomode optical fibers using

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Saint Michel sur Orge, France

Philippe Darbon