Patents by Inventor Makoto Kuratsu

Makoto Kuratsu 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 pulse testing device
    Patent number: 6954264
    Abstract: In order to improve a measuring precision in case of measuring properties of the optical fiber to be measured, in accordance with returned lights which have wavelengths different from each other, detection is carried out with respect to the returned lights of the wavelengths different from each other, at a timing based on difference of propagation rates between the returned lights in the optical fiber to be measured, and error between the returning points is compensated with respect to each returned light, in the optical pulse testing device for inputting the optical pulse to the optical fiber to be measured, to detect returned lights which have wavelengths different from each other and which are returned back from passing points in the optical fiber to be measured, respectively, in order to measure the properties of the optical fiber to be measured, in accordance with detection results of the returned lights.
    Type: Grant
    Filed: June 22, 2004
    Date of Patent: October 11, 2005
    Assignee: Yokogawa Electric Corporation
    Inventors: Tetsuya Araki, Makoto Kuratsu, Katsumi Hirata
  • Optical pulse testing device
    Publication number: 20040223136
    Abstract: In order to improve a measuring precision in case of measuring properties of the optical fiber to be measured, in accordance with returned lights which have wavelengths different from each other, detection is carried out with respect to the returned lights of the wavelengths different from each other, at a timing based on difference of propagation rates between the returned lights in the optical fiber to be measured, and error between the returning points is compensated with respect to each returned light, in the optical pulse testing device for inputting the optical pulse to the optical fiber to be measured, to detect returned lights which have wavelengths different from each other and which are returned back from passing points in the optical fiber to be measured, respectively, in order to measure the properties of the optical fiber to be measured, in accordance with detection results of the returned lights.
    Type: Application
    Filed: June 22, 2004
    Publication date: November 11, 2004
    Applicants: Kyusyu Ando Electric Company Limited, Ando Electric Co., Ltd.
    Inventors: Tetsuya Araki, Makoto Kuratsu, Katsumi Hirata
  • Optical pulse testing device
    Patent number: 6771361
    Abstract: In order to improve a measuring precision in case of measuring properties of the optical fiber to be measured, in accordance with returned lights which have wavelengths different from each other, detection is carried out with respect to the returned lights of the wavelengths different from each other, at a timing based on difference of propagation rates between the returned lights in the optical fiber to be measured, and error between the returning points is compensated with respect to each returned light, in the optical pulse testing device for inputting the optical pulse to the optical fiber to be measured, to detect returned lights which have wavelengths different from each other and which are returned back from passing points in the optical fiber to be measured, respectively, in order to measure the properties of the optical fiber to be measured, in accordance with detection results of the returned lights.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: August 3, 2004
    Assignees: Kyusyo Ando Electric Company Limited, Ando Electric Co., Ltd.
    Inventors: Tetsuya Araki, Makoto Kuratsu, Katsumi Hirata
  • Optical pulse testing device
    Publication number: 20030160952
    Abstract: In order to improve a measuring precision in case of measuring properties of the optical fiber to be measured, in accordance with returned lights which have wavelengths different from each other, detection is carried out with respect to the returned lights of the wavelengths different from each other, at a timing based on difference of propagation rates between the returned lights in the optical fiber to be measured, and error between the returning points is compensated with respect to each returned light, in the optical pulse testing device for inputting the optical pulse to the optical fiber to be measured, to detect returned lights which have wavelengths different from each other and which are returned back from passing points in the optical fiber to be measured, respectively, in order to measure the properties of the optical fiber to be measured, in accordance with detection results of the returned lights.
    Type: Application
    Filed: February 27, 2003
    Publication date: August 28, 2003
    Inventors: Tetsuya Araki, Makoto Kuratsu, Katsumi Hirata