Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2006-09-26
2006-09-26
Doan, Jennifer (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S015000, C385S031000, C385S039000, C385S050000
Reexamination Certificate
active
07113674
ABSTRACT:
A fiber-type optical coupler has two optical fibers including a core on which a slanting Bragg diffraction grating is formed and a first cladding and a second cladding bordered with a boundary plane close to the core. The two optical fibers are placed by approximating the boundary plane almost contacting the core, making respective optical axes almost parallel and also making slanting directions of the respective Bragg diffraction gratings almost parallel. A wave vector of the slanting Bragg diffraction grating is located in a plane made by a normal set up on the boundary plane almost contacting the core and the optical axis of the core, and an angle_made by the wave vector and the optical axis is 0 degree <_<90 degrees. In addition, a refractive index of the second cladding is lower than that of the first cladding.
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Ohta Yoshinori
Urino Yutaka
Doan Jennifer
NEC Corporation
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