Rare-earth-doped waveguide
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United States of America Patent
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Apr 4, 2006
Grant Date -
Mar 18, 2004
app pub date -
Dec 7, 2001
filing date -
Dec 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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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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