Optical waveguides – Optical fiber waveguide with cladding
Reexamination Certificate
2007-12-25
2007-12-25
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
C359S341500, C372S006000
Reexamination Certificate
active
10530133
ABSTRACT:
New fiber lasers, spontaneous emission sources, and optical fiber amplifiers are provided. Their conventional counterparts, which have a fiber doped with thulium (Tm) ions and excited by 0.67 μm or 0.8 μm pumping light, have a problem in that their characteristics are deteriorated with the elapse of time. The new fiber lasers, spontaneous emission sources, and optical fiber amplifiers use 1.2 μm light as pumping light. Alternatively, they use a pumping source for exciting the thulium from the lowest energy level3H6to3H5excitation level. As a more preferable configuration, they improve the emission efficiency at 2.3 μm band by disclosing Tm-doped host glass.
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Aozasa Shinichi
Mori Atsushi
Sakamoto Tadashi
Shikano Kouji
Shimizu Makoto
Connelly-Cushwa Michelle
Nippon Telegraph and Telephone Corporation
Rahil Jerry T.
Workman Nydegger
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