Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2005-06-29
2008-08-26
Sanghavi, Hemang (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling structure
C385S039000, C385S041000
Reexamination Certificate
active
07418173
ABSTRACT:
A waveguide type optical control element which has an optical waveguide made of an insulating material having an electro-optic effect or a thermo-optic effect, and a control electrode provided in contact with or proximity to the optical waveguide; the optical waveguide having a propagation loss which is 1 dB/cm or less at wavelengths of from 1.3 μm to 1.6 μm. The control electrode is constituted of a conductive oxide film having a carrier electron concentration of 5.5×1020/cm3or less and a resistivity of 9.5×10−4Ωcm or less, and the conductive oxide film has a coefficient of extinction of light waves, of 0.240 or less at a wavelength of 1.55 μm.
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Abe Yoshiyuki
Mori Hiroshi
Terashima Akira
Kratz, Quintos & Hanson, LLP.
Prince Kajli
Sanghavi Hemang
Sumitomo Metal & Mining Co., Ltd.
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