07664353 cites 30 patents.

The present invention disclosed is an optical waveguide structure that has a first waveguide provided with the opposite ends A and B, a second waveguide with the opposite ends C and D, a third waveguide with the opposite ends E and F, and a coupling waveguide having its first beam incoming/outgoing end connected to the end B of the first waveguide and its second beam incoming/outgoing end connected to the end C of the second waveguide and the end E of the third waveguide. The optical waveguide is characterized in that the first waveguide and the coupling waveguide are longitudinally dimensioned so that light beam at its peak of light intensity can transit the point of axial mal-alignment at the end A of the first waveguide and further transit the axial zone at the second beam incoming/outgoing end of the coupling waveguide.

Title
Optical waveguide structure including at least first, second and third waveguides and coupling waveguide
Application Number
10/544686
Publication Number
7664353 (B2)
Application Date
May 13, 2004
Publication Date
February 16, 2010
Inventor
Nobuo Miyadera
Tsukuba
JP
Rei Yamamoto
Tsukuba
JP
Agent
Antonelli Terry Stout & Kraus
Assignee
Hitachi Chemical Company
JP
IPC
G02B 6/26
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