Rare earth element-doped multiple-core optical fiber, method for

Details Rare earth element-doped multiple-core optical fiber, method for Rare earth element-doped multiple-core optical fiber, method for

1995-06-07

1996-10-29

Bovernick, Rodney B.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385123, 385124, 385141, G02B 602

Patent

active

055704484

ABSTRACT:
At least three elementary optical fibers are covered with a jacket layer. Each of the elementary optical fibers has a core of a first refractive index doped with at least one rare earth element and Al, and a cladding layer of a second refractive index lower than the first refractive index for covering the core. A value of (1+2t/Dw) is ranged to be 1.1 to 2.5, where t is a thickness of the cladding layer, and Dw is an outer diameter of the core, and a doping amount of Al is at least 1 weight %. The at least three elementary optical fibers are inserted into a jacket tube, and the elementary optical fibers and the jacket tube are heated to be welded at contact surfaces thereof by vacuum-drawing air from interstices of the elementary optical fibers and the jacket tube. Thus, a preform is obtained, and the preform is heated to be drawn. Consequently, a rare earth element-doped multiple-core optical fiber is fabricated. The rare earth element-doped multiple-core optical fiber is used to amplify a signal light to be propagated therethrough by receiving an excitation light.

REFERENCES:
patent: 5351335 (1994-09-01), Ohishi et al.
patent: 5412672 (1995-05-01), Ainslie et al.

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