Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide core
Reexamination Certificate
2005-08-30
2005-08-30
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide core
C385S147000, C372S006000, C359S341320
Reexamination Certificate
active
06937810
ABSTRACT:
This invention relates to an optical fiber for amplification suitable for amplifying signals in the L-band, an optical fiber amplifier including the optical fiber, and an optical transmission system. The optical fiber amplifier according to the invention includes a silica-based optical fiber as an optical fiber for amplification, which has a core region doped with Er and Al. The optical fiber for amplification has an Er concentration of 1,500 wt.ppm or less, and has the characteristics at a wavelength of 1.53 μm of: an absorption loss of 10 dB/m or more but 25 dB/m or less; and an unsaturated absorption of 900 dB or less.
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Kashiwada Tomonori
Suzuki Toshimi
McDermott Will & Emery LLP
Palmer Phan T. H.
Sumitomo Electric Industries Ltd.
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