Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2011-03-01
2011-03-01
Sanghavi, Hemang (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S131000, C372S050110, C372S102000
Reexamination Certificate
active
07899283
ABSTRACT:
An optical device including: an optical waveguide; and a plurality of diffraction grating layers provided along the optical waveguide, wherein each of the diffraction grating layers comprises a diffraction grating, each diffraction grating comprising a discontinuous first semiconductor layer and a second semiconductor layer burying the first semiconductor layer, the first and second semiconductor layers having different refractive indices, the plurality of diffraction grating layers comprise at least two diffraction grating layers being different from each other in terms of the length of a region where the diffraction grating is provided, and the diffraction gratings in an overlap region of the plurality of diffraction grating layers have the same phase and period is provided.
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International Search Report of PCT/JP2008/055113, mailing date of Apr. 22, 2008.
Matsuda Manabu
Yamamoto Tsuyoshi
Fujitsu Limited
Sanghavi Hemang
Westerman Hattori Daniels & Adrian LLP
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