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AssigneeNippon Telegraph and Telephone Corporation
InventorsShin Kamei, Motohaya Ishii, Akihiro Takagi, Takeshi Kitagawa
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A practical optical waveguide circuit is provided which includes many intersections but is low loss. The width of a waveguide core is w1 at input and output terminal sections and w2 at an intersecting section, where w2>w1. The core width of the intersecting section is made different from that of the input and output terminal sections, or the core height of the intersecting section is made different from that of the input and output terminal sections. The core width is smoothly varied between the intersecting section and the input and output terminal sections by a tapered section. When the number of the waveguides intersecting with the intersecting section is 100, the intersection loss is 5.8 dB for the conventional device where w2=w1=5 μm, but is 1.8 dB when w2=12 μm, thereby being able to reduce the intersection loss sharply.
An optical waveguide circuit including a first optical waveguide composed of a cladding and a core, and a set of second optical waveguides consisting of a plurality of optical waveguides, which are each composed of a cladding and a core, and intersect with the first optical waveguide successively, said first optical waveguide comprising:
An optical waveguide circuit composed of optical waveguides each consisting of a cladding and a core and including an arrayed-waveguide grating having a given number of input optical waveguides and a plurality of output optical waveguides;
Dependencies are inferred from the claim text.