Rare earth element-doped multiple-core optical fiber and optical

Details Rare earth element-doped multiple-core optical fiber and optical Rare earth element-doped multiple-core optical fiber and optical

1997-01-27

1998-04-21

Palmer, Phan T. H.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385123, 385124, 385141, 372 70, 359333, 359341, G02B 602

Patent

active

057427224

ABSTRACT:
A rare earth element-doped multiple-core optical fiber 31 has a bundle of cores 32-1.about.32-7 co-doped with Er and Al, primary cladding layers 33 covering each core, and an outer cladding layer 34 covering all cores 32-1.about.32-7, wherein one core 32-1 being positioned substantially on a central axis of the outer cladding layer and surrounded by other six cores 32-2.about.32-7. A core diameter Dc of the center core 32-1 is smaller than a core diameter Do of each peripheral core 32-2.about.32-7. The power of both signal light (1.53 .mu.m.about.1.57 .mu.m wavelength bands) and pumping light (0.98 .mu.m or 1.48 .mu.m band) propagating through the center core 32-1 becomes lower and the power propagating through each core 32-1.about.32-7 is equalized, and the flatter characteristics of gain to wavelength are obtained.

REFERENCES:
patent: 5570448 (1996-10-01), Imoto et al.

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