Patents by Inventor Sawaki Watanabe

Sawaki Watanabe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Semiconductor optical element
    Patent number: 7952172
    Abstract: A light receiving element 1 has a semiconductor substrate 101; a first mesa 11 provided over the semiconductor substrate 101, and having an active region and a first electrode (p-side electrode 111) provided over the active region; a second mesa 12 provided over the semiconductor substrate 101, and having a semiconductor layer and a second electrode (n-side electrode 121) provided over the semiconductor layer; and a third mesa 13 provided over the semiconductor substrate 101, and having a semiconductor layer, wherein the third mesa 13 is arranged so as to surround the first mesa 11.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: May 31, 2011
    Assignee: NEC Corporation
    Inventors: Sawaki Watanabe, Kazuhiro Shiba, Takeshi Nakata
  • Semiconductor light-receiving device
    Patent number: 7924380
    Abstract: Disclosed is light-receiving device (1) comprising semiconductor substrate (101), a light-receiving layer arranged on semiconductor substrate (101), and filter layer (103) arranged between semiconductor substrate (101) and the light-receiving layer to absorb light other than reception light. First mesa (11) serving as the light-receiving layer is surrounded by third mesa (13) for absorbing at least light other than reception light. Consequently, even when filter layer (103) is too thin to sufficiently absorb light other than reception light, third mesa (13) absorbs the light, thereby preventing the light from reaching first mesa (11).
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: April 12, 2011
    Assignee: NEC Corporation
    Inventor: Sawaki Watanabe
  • SEMICONDUCTOR LIGHT-RECEIVING DEVICE
    Publication number: 20100044818
    Abstract: Disclosed is light-receiving device (1) comprising semiconductor substrate (101), a light-receiving layer arranged on semiconductor substrate (101), and filter layer (103) arranged between semiconductor substrate (101) and the light-receiving layer to absorb light other than reception light. First mesa (11) serving as the light-receiving layer is surrounded by third mesa (13) for absorbing at least light other than reception light. Consequently, even when filter layer (103) is too thin to sufficiently absorb light other than reception light, third mesa (13) absorbs the light, thereby preventing the light from reaching first mesa (11).
    Type: Application
    Filed: January 17, 2008
    Publication date: February 25, 2010
    Inventor: Sawaki Watanabe
  • SEMICONDUCTOR OPTICAL ELEMENT
    Publication number: 20090160033
    Abstract: A light receiving element 1 has a semiconductor substrate 101; a first mesa 11 provided over the semiconductor substrate 101, and having an active region and a first electrode (p-side electrode 111) provided over the active region; a second mesa 12 provided over the semiconductor substrate 101, and having a semiconductor layer and a second electrode (n-side electrode 121) provided over the semiconductor layer; and a third mesa 13 provided over the semiconductor substrate 101, and having a semiconductor layer, wherein the third mesa 13 is arranged so as to surround the first mesa 11.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 25, 2009
    Applicant: NEC Corporation
    Inventors: Sawaki Watanabe, Kazuhiro Shiba, Takeshi Nakata