Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-03-26
1999-09-07
Bovernick, Rodney
Optical waveguides
With optical coupler
Input/output coupler
385128, 385132, G02B 634
Patent
active
059499346
ABSTRACT:
An optical waveguide grating with radiative mode-coupling properties, with exceptional stability and reliability as an optical component, wherein the central wavelength of the rejection band has a low temperature dependence, due to the use of silica glass doped with germanium and boron for the core. The rejection bandwidth can be narrowed without increasing the grating length by forming the radiative mode-coupled optical waveguide grating in an optical waveguide wherein the mean relative refractive index difference of the core is greater than that of optical communication waveguides. The rejection can be increased by reducing the occurrence of cases wherein propagation modes of the core coupled to cladding modes once again couple to the core in palnar optical waveguide gratings formed by making periodic changes in the waveguide structure along the direction of propagation of light in an optical waveguide having a cladding with a lower refractive index than the core surrounding the core, by making the thickness of the cladding at least thirteen times the thickness of the core.
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Hidaka Hiroshi
Himeno Kuniharu
Ienaka Takuya
Nakai Michihiro
Okude Satoshi
Bovernick Rodney
Fujikura Ltd.
Kang Ellen E.
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