Rare-earth-doped waveguide

Details Rare-earth-doped waveguide Rare-earth-doped waveguide

2006-04-04

2006-04-04

Kianni, Kaveh (Department: 2883)

Optical waveguides

Having particular optical characteristic modifying chemical...

Of waveguide core

C385S141000, C385S122000

Reexamination Certificate

active

07024092

ABSTRACT:
The present invention is to a method of adapting optical rare-earth-doped waveguide (10) having a plurality of transverse propagation modes, such that in use, signal gains of non-fundamental modes of the waveguide are attenuated relative to a signal gain of a fundamental mode of the waveguide. The waveguide (10) has a light-guiding region (45) defined by a refractive index-modifying dopant, such as Ge, which has a thermal diffusion coefficient at temperature T in the waveguide greater than a thermal diffusion coefficient of the rare-earth dopant at temperature T. The method comprises heating the waveguide (10) at the temperature T such that a concentration profile of the refractive index-modifying dopant becomes broader than a concentration profile of the rare-earth dopant.

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patent: 6256330 (2001-07-01), LaComb
patent: 6687439 (2004-02-01), Endo et al.
patent: WO 9210014 (1992-06-01), None
patent: WO 0043816 (2000-07-01), None

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