Optical waveguides – Planar optical waveguide – Thin film optical waveguide
Reexamination Certificate
2007-07-09
2008-08-19
Healy, Brian (Department: 2883)
Optical waveguides
Planar optical waveguide
Thin film optical waveguide
C385S129000, C385S130000, C385S132000, C257S013000, C257S017000, C257S018000, C257S019000, C257S020000, C257S021000, C257S079000, C257S080000, C257S081000, C257S082000
Reexamination Certificate
active
07415185
ABSTRACT:
A buried-waveguide light detecting element includes an n-type cladding layer on a Fe-InP substrate, a waveguide on a portion of the n-type cladding layer, and in which an n-type light guide layer, an i-light guide layer having a refractive index equal to or higher than that of the n-type cladding layer and undoped or having an impurity concentration of 1×1017cm−3or less, lower than the impurity concentration in the n-type light guide layer, a light absorption layer having a refractive index higher than that of the i-light guide layer, a p-type light guide layer, and a p-type cladding layer are successively layered in mesa form, from the Fe—InP substrate, and a blocking layer on the Fe—InP substrate and in which side walls of the waveguide are embedded.
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Ishimura Eitaro
Nakaji Masaharu
Anderson Guy G
Healy Brian
Leydig , Voit & Mayer, Ltd.
Mitsubishi Electric Corporation
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