G - Physics – 02 – B
Patent
G - Physics
02
B
345/33, 88/97.6
G02B 6/12 (2006.01) C03C 13/04 (2006.01) G02B 6/10 (2006.01) G02B 6/132 (2006.01) H01S 3/063 (2006.01)
Patent
CA 2040527
A core waveguide having a substantially rectangular cross section, with the width thereof greater than the thickness thereof, is provided in a cladding formed on a substrate, and a rare earth element-doped layer is provided in the core waveguide along the waveguiding direction of the waveguide. With the width of the core waveguide set gearter than the thickness of the core waveguide, good optical confinement in the width direction of the waveguide is obtained, which enables light to be absorbed by the rare earth element-doped layer efficiently and concentratedly. It is thereby possible to achieve a marked improvement in the excitation efficiency of excitation power. Thus, an enhanced exciation efficiency is achieved with less addition of a rare earth element, and a high-gain optical amplification waveguide free of concentration extinction is provided.
Imoto Katsuyuki
Kamoshida Toshikazu
Kashimura Seiichi
Kikuchi Fujio
Kimura Yasuo
Hitachi Cable Limited
Marks & Clerk
Nippon Telegraph & Telephone Corporation
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