公开(公告)号：US20220399467A1

公开(公告)日：2022-12-15

申请号：US17619070

申请日：2020-06-15

申请人： NTT Electronics Corporation ,  Nippon Telegraph and Telephone Corporation

发明人： Keiichi Morita ,  Atsushi Murasawa ,  Hiroki Kawashiri ,  Yusuke Nasu

IPC分类号： H01L31/0224 ,  H01L31/0232 ,  H01L31/105

摘要： A light shielding structure of an optical circuit of the present invention uses a part of the structure of the light reception element itself to suppress stray light. A stepped electrode that covers an upper surface and side surface of a first semiconductor layer constituting a light absorption portion of the light reception element is formed at a height substantially equal to that of an optical waveguide in the optical circuit, and the light absorption portion of the light reception element is shielded from stray light by a wall-shaped or column-shaped wiring electrode extending substantially perpendicularly to a surface layer of the optical circuit. The light shielding structure of the present invention uses a part of the configuration of the light reception element, is formed integrally with the light reception element, and also has an aspect of the invention of the light reception element.

公开(公告)号：US10054738B2

公开(公告)日：2018-08-21

申请号：US15438801

申请日：2017-02-22

申请人： NTT ELECTRONICS CORPORATION

发明人： Keiichi Morita ,  Kazumi Shimizu ,  Kouji Kawashima ,  Tomoharu Niitsu

IPC分类号： G02B6/34 ,  G02B6/12 ,  G02B6/293

CPC分类号： G02B6/12014 ,  G02B6/12011 ,  G02B6/2813 ,  G02B6/29344

摘要： A technique that does not increase the circuit size, does not make the circuit design and manufacturing difficult, and can reduce insertion loss when light enters from a slab waveguide toward an arrayed waveguide or when the light enters from the arrayed waveguide toward the slab waveguide. An optical waveguide provided with a slab waveguide in which a grating is formed therein at a distance from an end, and an arrayed waveguide whose end is connected to an end of the slab waveguide at a position where a constructive interference portion of a self-image of the grating is formed. An arrayed waveguide grating provided with a first input/output waveguide, the above-mentioned optical waveguide where an end of the slab waveguide on the opposite side of the arrayed waveguide is connected to an end of the first input/output waveguide, a second slab waveguide connected to an end of the arrayed waveguide on the opposite side of the slab waveguide, and a second input/output waveguide connected to an end of the second slab waveguide on the opposite side of the arrayed waveguide.