Patents by Inventor Haruki Ogoshi

Haruki Ogoshi 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).

  • Publication number: 20210184419
    Abstract: A light source for Raman amplification to Raman-amplify signal light includes: plural incoherent light sources that output incoherent light; plural pumping light sources that output second-order pumping light; an optical fiber for Raman amplification to Raman-amplify the incoherent light with the second-order pumping light, and outputs the amplified incoherent light; and an output unit connected to the optical transmission fiber, receiving the amplified incoherent light, and outputting the amplified incoherent light as first-order pumping light having a wavelength that Raman-amplifies the signal light to the optical transmission fiber.
    Type: Application
    Filed: February 26, 2021
    Publication date: June 17, 2021
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Haruki OGOSHI, Masahito MORIMOTO
  • Patent number: 10938175
    Abstract: A light source for Raman amplification to Raman-amplify signal light includes: plural incoherent light sources that output incoherent light; plural pumping light sources that output second-order pumping light; an optical fiber for Raman amplification to Raman-amplify the incoherent light with the second-order pumping light, and outputs the amplified incoherent light; and an output unit connected to the optical transmission fiber, receiving the amplified incoherent light, and outputting the amplified incoherent light as first-order pumping light having a wavelength that Raman-amplifies the signal light to the optical transmission fiber.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: March 2, 2021
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Haruki Ogoshi, Masahito Morimoto
  • Publication number: 20180123311
    Abstract: A light source for Raman amplification to Raman-amplify signal light includes: plural incoherent light sources that output incoherent light; plural pumping light sources that output second-order pumping light; an optical fiber for Raman amplification to Raman-amplify the incoherent light with the second-order pumping light, and outputs the amplified incoherent light; and an output unit connected to the optical transmission fiber, receiving the amplified incoherent light, and outputting the amplified incoherent light as first-order pumping light having a wavelength that Raman-amplifies the signal light to the optical transmission fiber.
    Type: Application
    Filed: November 13, 2017
    Publication date: May 3, 2018
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Haruki OGOSHI, Masahito MORIMOTO
  • Publication number: 20030108283
    Abstract: The present invention provides an optical demultiplexer module capable of narrowing the interval between wavelengths of divided light. The optical demultiplexer module is provided with an optical circulator (2) or a non-reciprocal optical branching device, the first and second optical waveguides (3) and (4) connected to the optical circulator or non-reciprocal optical branching device, and the second arrayed waveguide diffraction grating (6) connected to the second optical waveguide (4) and having a plurality of emitting ports (6a) through (6h). The first optical waveguide (3) has a plurality of filters (3a) through (3i) which reflects light of a specified wavelength to the second optical waveguide (4) via the optical circulator (2) or non-reciprocal optical branching device. In the second arrayed waveguide diffraction grating (6), the center wavelengths of light emitted from a plurality of emitting ports differ by an appointed frequency in terms of frequency.
    Type: Application
    Filed: May 14, 2002
    Publication date: June 12, 2003
    Inventors: Toshihiko Ota, Haruki Ogoshi, Tsunetoshi Saito, Toshiaki Tsuda
  • Patent number: 6411430
    Abstract: In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, there are provided one or more optical variable attenuator means, and an attenuation amount control means for changing an optical attenuation amount of the optical variable attenuator means on the basis of temperature of the rare earth doped optical fibers or an environmental temperature. In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, between the rare earth doped optical fibers, there are provided a replaceable optical part, one or more optical variable attenuator means, and an attenuation amount control means for changing an optical attenuation amount of the optical variable attenuator means on the basis of temperature of the rare earth doped optical fibers or an environmental temperature.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: June 25, 2002
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Atsushi Ogino, Masaru Fukushima, Yoshihiro Emori, Haruki Ogoshi, Yoshio Tashiro
  • Patent number: 6333803
    Abstract: An optical transmitter provided with a supercontinuum light source 4 which is composed of an optical amplifier 2 made by using a polarization maintaining amplification fiber 1 and a polarization maintaining fiber 3 which has a length of at least a specified value, is connected to the output side of the optical amplifier 2 and emits light having a continuous wave and a stable plane of polarization, a polarization maintaining optical demultiplexer 5 which takes out a light with a desired wavelength from the continuous wave light, and an external modulator 6 which superposes desired information upon the light with the desired wavelength.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: December 25, 2001
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Katsuya Kurotori, Haruki Ogoshi
  • Patent number: 6198570
    Abstract: A method of manufacturing an optical filter that can restrain the wavelength dependence of the gain of an optical amplifier. The input signal light power, output power of pump light source (8), and the output signal light power of an optical amplifier (4) are set to the power values used for optical communication systems, and the total power of the simulation input light of a plurality of wavelengths (&lgr;1, &lgr;2, . . . &lgr;n) from light sources (1a) and an input light (probe light) from light sources (1m) are set equal to the total power of the input signals of a plurality of wavelengths used in wavelength division multiplex transmission systems.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: March 6, 2001
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Masaru Fukushima, Haruki Ogoshi, Hijiri Nimura
  • Patent number: 6028698
    Abstract: An optical fiber amplifier can maintain its optical power output above a level exceeding +20 dBm and a low noise figure if the input optical signal shows a high power level.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: February 22, 2000
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Haruki Ogoshi, Hiroki Tachibana
  • Patent number: 5965874
    Abstract: A method to obtain polarization characteristics of an optical transmission medium is disclosed. Sequentially plural different states of polarized light are launched into the optical transmission medium. Intensities of light emerging from the optical transmission medium through combinations of optical elements are measured to obtain Stokes parameters from which Stokes vectors describing the emerging light corresponding to each of the plural sequentially launched states of polarization are obtained; for at least three different launched states of polarization, descriptors are used of these launched states of polarization and the Stokes vectors describing the corresponding emerging light to calculate a Jones matrix which mathematically models the changes that the launched light when described in terms of a Jones vector is subject to when passing through the optical transmission medium; and, the Jones matrix is used to describe the polarization characteristics of the optical transmission medium.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: October 12, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Osamu Aso, Isamu Ohshima, Haruki Ogoshi
  • Patent number: 5933552
    Abstract: A method of manufacturing an optical filter that can restrain the wavelength dependence of the gain of an optical amplifier. The input signal light power, output power of pump light source (8), and the output signal light power of an optical amplifier (4) are set to the power values used for optical communication systems, and the total power of the simulation input light of a plurality of wavelengths (.lambda.1, .lambda.2, . . . .lambda.n) from light sources (1a) and an input light (probe light) from light sources (1m) are set equal to the total power of the input signals of a plurality of wavelengths used in wavelength division multiplex transmission systems.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: August 3, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Masaru Fukushima, Haruki Ogoshi, Hijiri Nimura
  • Patent number: 5883736
    Abstract: An Er-doped optical fiber amplifier is adapted to increase the length of transmission path by raising the intensity of pumped light. In an Er-doped optical fiber amplifier 1 for amplifying signal light by means of an Er-doped optical fiber 7, using a 1,530 nm band pumping source 8, 1,530 nm band pumped light is Raman-amplified by a 1,430 nm-1,450 nm band light source 9 on the transmission path of an optical fiber 5.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: March 16, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Isamu Oshima, Akira Fujisaki, Haruki Ogoshi
  • Patent number: 5808768
    Abstract: There is provided an optical telecommunications method that can externally modulate a plane of polarization without producing any null point. According to the invention, in an optical telecommunications system for externally modulating the plane of polarization of the light being transmitted through an optical fiber for the transmission of a polarized wave signal by externally applying a signal to modify the state of polarization, the source of light for the transmission of a polarized wave signal is a fiber ring laser.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: September 15, 1998
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Masateru Tadakuma, Masahito Morimoto, Hijiri Nimura, Haruki Ogoshi
  • Patent number: 5379357
    Abstract: An apparatus and method for optical telecommunication includes introducing a laser beam emitted from a light source at a first station into an optical fiber, providing an ultrasonic wave obtained by modulating a voice signal by a signal-applying-device at a work section to the optical fiber, modulating a polarized light passing through the optical fiber in amplitude and frequency, receiving the polarized light with the shifted wave plane at a light-receiving section in a second station, detecting at the light-receiving section in the second station the polarized light which has been modulated by the signal-applying device in the work section, and demodulating the polarized light to obtain a voice signal.
    Type: Grant
    Filed: April 1, 1993
    Date of Patent: January 3, 1995
    Assignees: The Furukawa Electric Co., Ltd., The Tokyo Electric Power Company, Incorporated
    Inventors: Shintaro Sentsui, Akira Fujisaki, Haruki Ogoshi, Morinobu Mizutani, Mitsuo Miyazaki
  • Patent number: 5202746
    Abstract: A technique for identifying an optical transmission medium from a plurality of single-mode-type optical transmission media by using longitudinal middle portions of the media as an identification section by first exciting a particular optical transmission media by means of a polarized light, next applying either an electromagnetic action or a mechanical action to the particular optical transmission medium to modulate the polarized light and then identifying the particular optical transmission medium based on the deviation of the polarized plane of the polarized light.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: April 13, 1993
    Assignees: The Furukawa Electric Co., Ltd., The Tokyo Electric Power Co., Incorporated
    Inventors: Shintaro Sentsui, Akira Fujisaki, Haruki Ogoshi, Morinobu Mizutani, Mitsuo Miyazaki