Patents by Inventor Kensaku Sekiya

Kensaku Sekiya 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).

  • Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus
    Patent number: 7511883
    Abstract: A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the logarithmic transformation circuit. The AGC circuit controls the pump LD based on the monitored optical input/output power so as to control the gain of the optical amplifier to be a requested value.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: March 31, 2009
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Ryo Kawahara, Masaru Fukushima, Nobuyuki Kagi, Kensaku Sekiya
  • OPTICAL AMPLIFYING METHOD, OPTICAL AMPLIFYING APPARATUS, AND OPTICAL AMPLIFIED TRANSMISSION SYSTEM USING THE APPARATUS
    Publication number: 20080068700
    Abstract: A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the logarithmic transformation circuit. The AGC circuit controls the pump LD based on the monitored optical input/output power so as to control the gain of the optical amplifier to be a requested value.
    Type: Application
    Filed: October 31, 2007
    Publication date: March 20, 2008
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Ryo KAWAHARA, Masaru Fukushima, Nobuyuki Kagi, Kensaku Sekiya
  • Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus
    Patent number: 7333262
    Abstract: A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the logarithmic transformation circuit. The AGC circuit controls the pump LD based on the monitored optical input/output power so as to control the gain of the optical amplifier to be a requested value.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: February 19, 2008
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Ryo Kawahara, Masaru Fukushima, Nobuyuki Kagi, Kensaku Sekiya
  • Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus
    Publication number: 20040156094
    Abstract: A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the logarithmic transformation circuit. The AGC circuit controls the pump LD based on the monitored optical input/output power so as to control the gain of the optical amplifier to be a requested value.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 12, 2004
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Ryo Kawahara, Masaru Fukushima, Nobuyuki Kagi, Kensaku Sekiya