The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2019
Filed:
Mar. 01, 2018
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Yoshihiro Yoneda, Yokohama, JP;
Takuya Okimoto, Yokohama, JP;
SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC., Yokohama-shi, JP;
Abstract
A functional optical device is disclosed. The functional optical device integrates a coupling unit, a waveguide photodiode (PD) and an optical waveguide on a semiconductor substrate. The coupling unit extracts an optical signal by performing interference of signal light with local light. The optical waveguide carries the optical signal from the coupling unit to the waveguide PD. The semiconductor substrate provides a heavily doped conducting layer and a buffer layer that is un-doped or lightly doped with n-type impurities by density smaller than density of impurities in the heavily doped conducting layer. The conducting layer and the buffer layer continuously and evenly extend from the optical waveguide to the waveguide PD.