Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2005-04-19
2005-04-19
Font, Frank G. (Department: 2877)
Optical waveguides
With optical coupler
Input/output coupler
C385S010000, C359S558000
Reexamination Certificate
active
06882777
ABSTRACT:
The present invention relates to a diffraction grating device in which a diffraction grating based on perturbation of refractive index is formed through a predetermined range in a light guide direction in an optical waveguide and in which the diffraction grating selectively reflects light in a reflection band out of light guided through the optical waveguide. In the diffraction grating device, where a first band is defined as a band with a maximum bandwidth out of continuous wavelength bands for which the transmittance is not more than T0and where a second band is defined as a wavelength band between a maximum wavelength and a minimum wavelength out of wavelengths for which the reflectance is R0, T0is not more than −20 dB and R0is not more than −20 dB. A ratio (B1/B2) of a width B1, of the first band to a width B2of the second band is not less than 0.3. A maximum group delay difference caused by reflection of the light in the first band by the diffraction grating is not more than a predetermined limit, 0.011×exp(7.86×B1/B2−0.045×R0)/B1.
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Inoue Akira
Shiozaki Manabu
Font Frank G.
Kianni Kevin
McDermott Will & Emery LLP
Sumitomo Electric Industries Ltd.
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