Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2005-08-02
2005-08-02
Lee, John D. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S043000
Reexamination Certificate
active
06925228
ABSTRACT:
A practical optical waveguide circuit is provided which includes many intersections but is low loss. The width of a waveguide core is w1at input and output terminal sections and w2at 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.
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Ishii Motohaya
Kamei Shin
Kitagawa Takeshi
Takagi Akihiro
Lee John D.
Lin Tina M
Nippon Telegraph and Telephone
Workman Nydegger
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