Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Reexamination Certificate
2007-08-30
2010-06-01
Petkovsek, Daniel (Department: 2874)
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
C385S124000, C385S126000, C385S127000, C359S341100, C359S341200, C359S341300
Reexamination Certificate
active
07729588
ABSTRACT:
An optical fiber includes: a first core portion doped with rare earth ions; a second core portion having a lower refractive index than that of the first core portion, provided along an outer circumference of the first core portion, and doped with the rare earth ions; and a clad portion having a lower refractive index than that of the second core portion and provided along an outer circumference of the second core portion, and is configured such that a concentration of the rare earth ions added to the second core portion is higher than that to the first core portion. With this configuration, it is possible to suppress an amount of FWM crosstalk in an optical amplification by decreasing the length of a fiber while alleviating efficiency deterioration due to concentration quenching.
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Hayashi Etsuko
Inagaki Shinya
Nishihara Masato
Fujitsu Limited
Petkovsek Daniel
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