Doped optical fiber having core and clad structure for increasin

Details Doped optical fiber having core and clad structure for increasin Doped optical fiber having core and clad structure for increasin

1996-10-08

1998-07-07

Lee, John D.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

359341, G02B 622

Patent

active

057781290

ABSTRACT:
An optical fiber having a core for propagating light, where the core includes first, second and third regions. The first, second and third regions are concentrically arranged with the second region around the first region and the third region around the second region. The third region includes a dopant for increasing the refractive index of the third region. The first region includes a first dopant for providing an amplification band and a second dopant for expanding the amplification band. The second region has an impurity concentration which is lower than the concentration of the dopant in the third region and is lower than the concentrations of the first and second dopants in the first region. Upon production of the fiber, the second region acts as a barrier to prevent diffusion of dopants. As a result, the amplification band can be effectively expanded. Various other arrangements of core and clad regions and dopants are provided. An optical amplifier using the various types of fibers is disclosed, as is a fiber having a structure which reduces loss when spliced to another fiber, and a method for splicing the fibers together.

REFERENCES:
patent: 4953947 (1990-09-01), Bhagavatula
patent: 5058976 (1991-10-01), DiGiovanni et al.
patent: 5278850 (1994-01-01), Ainslie et al.
patent: 5284500 (1994-02-01), Okamura et al.
patent: 5483612 (1996-01-01), Gallagher et al.
patent: 5570448 (1996-10-01), Imoto et al.

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