Optical branch device and optical coupler module

Details Optical branch device and optical coupler module Optical branch device and optical coupler module

2006-10-03

2006-10-03

Connelly-Cushwa, Michelle (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

Reexamination Certificate

active

07116868

ABSTRACT:
An optical branch device, comprising: a branch portion having a first branch waveguide extended linearly and continuously from a waveguide in a basis portion, and second and third branch waveguides extended in the directions farther from the first branch waveguide in such a manner that the first branch waveguide is interposed between the second and third branch waveguides; a parallel portion in which the second and third branch waveguides are positioned in parallel to the first branch waveguide; and a divergent portion in which the second and third branch waveguides are extended gradually farther from the first branch waveguide; wherein the interval pitch P (μm), in the transverse direction, between the first, second and third branch waveguides in the parallel portion and the refractive index difference (Δn) between the core and the clad are set in such a manner that C satisfies a relationship of C=0.5±0.2 wherein C is calculated by substituting P and Δn for an equation of C=Δn×P2.

REFERENCES:
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patent: 5949931 (1999-09-01), Kitamura
patent: 2002/0085785 (2002-07-01), Kishimoto et al.
patent: 2003/0016914 (2003-01-01), Kim
patent: 8-271744 (1996-10-01), None
KR 2004017539A, “Three-branch optical waveguide”, Feb. 27, 2004.
“Introductory Lecture, Basis and Actual Application of Optical Waveguide Design,” pp. 4-5, 14-19 and 66-71, Technical Information Institute Co., Ltd. (Japanese only).
“Introductory Lecture, Basis and Actual Application of Optical Waveguide Design,” pp. 4-5, 14-19 and 66-71, Technical Information Institute Co., Ltd.

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