Patents by Inventor Hideyuki Miyata
Hideyuki Miyata 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).
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Publication number: 20050169633Abstract: An optical transmission device improved in quality and reliability of OADM function and permitting configuration of highly-flexible, economical OADM networks. A wavelength tunable filter variably selects a wavelength according to a control frequency. A filter controller applies the control frequency to the filter while scanning wavelength over an entire signal bandwidth, to detect, from a reference wavelength monitor signal supplied thereto, a reference control frequency which permits the filter to select a reference wavelength and according to which wavelength is matched. On receiving a wavelength selection request, the controller obtains a target control frequency from the reference control frequency and the position of a target wavelength relative to the reference wavelength, and applies the obtained frequency to the filter. A reference wavelength filter transmits the reference wavelength therethrough. A light-receiving element monitors the transmitted reference wavelength to generate the monitor signal.Type: ApplicationFiled: March 18, 2005Publication date: August 4, 2005Applicant: FUJITSU LIMITEDInventors: Goji Nakagawa, Hideyuki Miyata, Yutaka Kai, Hiroshi Onaka, Setsuo Yoshida, Kyosuke Sone, Tomohiro Ueno
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Patent number: 6925214Abstract: The present invention aims at providing a connecting method capable of suppressing an influence of stray light for a plurality of optical function devices formed on the same substrate, and an optical apparatus applied with the control method. To this end, in the connecting method of optical function devices according to the present invention, the plurality of optical function devices formed on the same substrate are cascade connected so that both ends of an optical path passing through the plurality of optical function devices are positioned on the same end face of the substrate. According to such a connecting method, it becomes possible to effectively suppress a leakage of stray light from an optical input side to an optical output side.Type: GrantFiled: March 27, 2002Date of Patent: August 2, 2005Assignee: Fujitsu LimitedInventors: Hideyuki Miyata, Yoshihiko Kaitoh, Tadao Nakazawa, Masaharu Doi
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Publication number: 20050162741Abstract: A polarization controller is configured to comprise polarization state monitoring section for monitoring polarization states of input light and output light of a variable polarization light element; and a control section, when the positions on a Poincare sphere expressing each of the polarization states monitored by the polarization state monitoring section are at the positions being symmetric or approximately symmetric for the equator of the Poincare sphere, for rotating the Poincare sphere by ? by using the earth axis of the Poincare sphere as a rotation axis by changing the azimuth of the optical axis of the variable polarization light element, and also for inverting the changing direction of the phase shift amount. By this, arbitrary and endless control of polarization light can be realized by a phase shift amount being less than the wavelength ? of the input light.Type: ApplicationFiled: March 15, 2005Publication date: July 28, 2005Applicant: Fujitsu LimitedInventors: Kyosuke Sone, Setsuo Yoshida, Hideyuki Miyata
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Patent number: 6917732Abstract: The present invention aims at providing a connecting method capable of suppressing an influence of stray light for a plurality of optical function devices formed on the same substrate, and an optical apparatus applied with the control method. To this end, in the connecting method of optical function devices according to the present invention, the plurality of optical function devices formed on the same substrate are cascade connected so that both ends of an optical path passing through the plurality of optical function devices are positioned on the same end face of the substrate. According to such a connecting method, it becomes possible to effectively suppress a leakage of stray light from an optical input side to an optical output side.Type: GrantFiled: May 28, 2004Date of Patent: July 12, 2005Assignee: Fujitsu LimitedInventors: Hideyuki Miyata, Yoshihiko Kaitoh, Tadao Nakazawa, Masaharu Doi
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Patent number: 6895141Abstract: In the control method for the optical filter according to the present invention, WDM signal light obtained by wavelength division multiplexing a plurality of optical signals having different wavelengths is supplied to an optical filter to obtain output WDM signal light including a part of the plurality of optical signals. The output WDM signal light is converted into an electrical signal per wavelength channel of the output WDM signal light. Then, the optical filter is controlled according to the electrical signal so that the characteristic of the optical filter becomes stable.Type: GrantFiled: October 8, 2002Date of Patent: May 17, 2005Assignee: Fujitsu LimitedInventors: Hideyuki Miyata, Yutaka Kai, Isao Tsuyama
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Publication number: 20050088727Abstract: An optical apparatus having a loss compensation capability includes between an input connector 1A and an output connector 1B an input side optical parts 2 including an input monitor, an amplification medium 3, a loss medium 4, and an output side optical parts 5 including an output monitor in this order, and is provided with a control circuit 6 for controlling a gain based on a monitor result of input/output light. The amount of reflection attenuation on all points, on which the light can be reflected on the optical path from the output end of the amplification medium 3 to the output connector 1B, can be smaller than the amount of reflection attenuation on the end face of the output connector 1B.Type: ApplicationFiled: September 28, 2004Publication date: April 28, 2005Applicant: FUJITSU LIMITEDInventors: Hisao Nakashima, Miki Onaka, Masato Nishihara, Etsuko Hayashi, Hideyuki Miyata
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Publication number: 20050089275Abstract: An optical device module includes an optical device with a plurality of electrodes disposed at predetermined positions, a substrate disposed oppositely to the optical device and with wiring patterns for connecting to the electrodes, and a wiring which connects the electrodes to the wiring patterns.Type: ApplicationFiled: March 24, 2004Publication date: April 28, 2005Applicant: FUJITSU LIMITEDInventors: Yoichi Oikawa, Hirofumi Aota, Kazuaki Akimoto, Hideyuki Miyata, Yumi Nakazawa, Tadao Nakazawa
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Publication number: 20050089282Abstract: An optical device module includes an optical device, a soaking unit fixed to one surface of the optical device, a heating/cooling unit fixed to one surface of the soaking unit, a heat-insulating unit fixed to one surface of the heating/cooling unit, and a package that houses the optical device, the soaking unit, the heating/cooling unit, and the heat-insulating unit and to which the heat-insulating unit is fixed. The heating/cooling unit heats the optical device using self-generated heat or cools the optical device via the soaking unit.Type: ApplicationFiled: March 22, 2004Publication date: April 28, 2005Applicant: FUJITSU LIMITEDInventors: Yoichi Oikawa, Hirofumi Aota, Kazuaki Akimoto, Hideyuki Miyata, Tadao Nakazawa, Yumi Nakazawa
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Patent number: 6870972Abstract: The present invention aims at providing a connecting method of optical devices capable of suppressing a periodic wavelength dependence loss and the like, due to the inter-polarization-mode interference caused when connecting a plurality of optical devices by using an optical path having a polarization-preserving characteristic, and an optical apparatus applied with the connecting method. To this end, the connecting method according to the present invention, is to connect a plurality of optical devices to one another by using an optical path of polarization-preserving type having optical characteristics in which a light is propagated along two different polarization axes for substantially equal distances.Type: GrantFiled: March 27, 2002Date of Patent: March 22, 2005Assignee: Fujitsu LimitedInventors: Hideyuki Miyata, Yoshihiko Kaitoh, Tadao Nakazawa
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Publication number: 20040218866Abstract: The present invention aims at providing a connecting method capable of suppressing an influence of stray light for a plurality of optical function devices formed on the same substrate, and an optical apparatus applied with the control method. To this end, in the connecting method of optical function devices according to the present invention, the plurality of optical function devices formed on the same substrate are cascade connected so that both ends of an optical path passing through the plurality of optical function devices are positioned on the same end face of the substrate. According to such a connecting method, it becomes possible to effectively suppress a leakage of stray light from an optical input side to an optical output side.Type: ApplicationFiled: May 28, 2004Publication date: November 4, 2004Applicant: Fujitsu LimitedInventors: Hideyuki Miyata, Yoshihiko Kaitoh, Tadao Nakazawa, Masaharu Doi
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Publication number: 20040197099Abstract: A wavelength stabilizing filter has a wavelength transmission characteristic curve that has its peak in a wavelength located between a first continuous set band and a second continuous set band longer in wavelength than the first set band, and that linearly drops from the peak toward the shorter wavelength side than the first set band and also toward the longer wavelength side longer than the second set band. A control unit generates a control signal needed to enable an optical tunable filter to extract signal light with a predetermined wavelength from an inputted WDM signal, based on light transmitted through the wavelength stabilizing filter.Type: ApplicationFiled: February 27, 2004Publication date: October 7, 2004Inventors: Yutaka Kai, Hideyuki Miyata
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Publication number: 20040190904Abstract: A selected wavelength variable optical filter for selecting and outputting the signal lights of the desired wavelengths from the light multiplexing light lights of a plurality of wavelengths. When the multiplexing factor of the WDM signal light increases, the number of selected wavelength variable optical filters used in the AOTF device or the like also increases, resulting in increase of manufacturing cost.Type: ApplicationFiled: February 9, 2004Publication date: September 30, 2004Inventors: Masaji Noguchi, Tomohiro Ueno, Hideyuki Miyata, Yutaka Kai
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Publication number: 20040184809Abstract: A double-ring optical wavelength multiplex network is disclosed, which includes multiple optical transmission apparatuses that can reduce the unit cost of initially installing a small optical network while providing the flexibility to expand. For multiplexed optical signals arriving at a node, the optical transmission apparatus “drops” selected wavelengths for local delivery and “passes” others for continued transmission on the network. For optical signals originating (“added”) at the node, the optical transmission apparatus wavelength multiplexes the “added” signals with the “passing” signals for transmission on the network. For “added” signals, the optical transmission apparatus blocks “passing” signals of the same wavelength.Type: ApplicationFiled: January 27, 2004Publication date: September 23, 2004Applicant: FUJITSU LIMITEDInventors: Hideyuki Miyata, Hiroaki Tomofuji, Hiroshi Onaka, Minoru Takeno
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Publication number: 20040179840Abstract: Signal light with a specific wavelength is transmitted and extracted from signal light multiplexed by a WDM method, and a light detection unit detects the signal light detected by an optical tunable filter, whose wavelength transmission characteristic varies depending on a control signal. An operation circuit generates information for designating a control signal needed to enable the optical tunable filter to extract signal light with a designated wavelength, based on the detected results of two segments of signal light located at each edge of a wavelength band obtained by shifting the wavelength transmission characteristic of the optical tunable filter from outside the wavelength band including all segments of the entire WDM signal. A driving circuit generates a control signal according to the designation information.Type: ApplicationFiled: February 25, 2004Publication date: September 16, 2004Applicant: FUJITSU LIMITEDInventors: Yutaka Kai, Hideyuki Miyata
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Patent number: 6785306Abstract: A wavelength-tunable stabilized laser is provided with a light source comprising a plurality of lasers capable of oscillating at a plurality of wavelengths, a light detecting part for detecting the light intensity of laser light output from the light source via a periodic filter, and a controlling part for generating oscillation of one of the lasers of the light source and controlling the oscillation wavelength of the laser so that the output value of the light detecting part becomes equal to a predetermined one of a plurality of target values. The wavelength-tunable stabilized laser is able to generate oscillation of laser light at a desired wavelength, of the plurality of wavelengths, and to stabilize the wavelength.Type: GrantFiled: December 19, 2000Date of Patent: August 31, 2004Assignee: Fujitsu LimitedInventors: Yutaka Kai, Hideyuki Miyata
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Patent number: 6783282Abstract: The present invention aims at providing an optical wavelength filter of band rejection type capable of reliably and stably blocking a light of a desired wavelength from passing through. To this end, the optical wavelength filter of the present invention comprises a plurality of optical filter sections each blocking the light corresponding to the selected wavelength from passing through, the respective optical filter sections being cascade connected to be in a multi-staged structure, wherein the selected wavelengths in the optical filter sections are deviated from one another, to form a blocking band having a wavelength band corresponding to a deviation amount.Type: GrantFiled: March 27, 2002Date of Patent: August 31, 2004Assignee: Fujitsu LimitedInventors: Tadao Nakazawa, Hideyuki Miyata, Masaharu Doi
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Publication number: 20040165817Abstract: A wavelength multiplexing processing apparatus for use with a wavelength division multiplexing system is disclosed which uses a single AWG to achieve reduction in cost, size and loss. The wavelength multiplexing processing apparatus includes a waveguide device wherein a plurality of incoming and outgoing waveguides, a first slab waveguide and a plurality of channel waveguides are formed on a substrate, a mirror array device and a lens device. The plane direction angles of reflecting mirrors which reflect optical signal components incoming thereto are set so that reflected light of an optical signal component incoming from one of the plural incoming and outgoing waveguides may go out from one of the plural incoming and outgoing waveguides.Type: ApplicationFiled: December 30, 2003Publication date: August 26, 2004Applicant: Fujitsu LimitedInventors: Goji Nakagawa, Hideyuki Miyata
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Patent number: 6782017Abstract: An object of the invention is to provide a wavelength locker which has a wider locking range than that of the wavelength locker in the prior art and which can cope with a plurality of wavelengths. The aforementioned objects are achieved by a wavelength locker, which comprises a periodic filter, a detecting part for detecting the intensity of a laser beam through the periodic filter, and a controlling part for controlling the wavelength of the laser beam to a desired wavelength in accordance with the output of the detecting part. In this wavelength locker, the FSR of the periodical filter is controlled according to space between the wavelengths, and refers to the number of wavelength to be locked, so that the characteristics corresponding to output wavelengths that vary in every period twice the space of wavelengths and are complementary to each other, can be obtained, and the locking range will become wider.Type: GrantFiled: April 28, 2000Date of Patent: August 24, 2004Assignee: Fujitsu LimitedInventors: Yutaka Kai, Hideyuki Miyata, Hiroshi Onaka
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Publication number: 20030228148Abstract: An optical network ensures substantially same received optical powers even if optional optical paths are connected between node apparatuses in a ringed optical network, and to provide a node apparatus for use in the network. The optical ring network system includes a plurality of node apparatuses each sending out wavelength division multiplexed optical signals; an optical transmission line connecting the plurality of node apparatuses in a ring; and at least one optical amplifier disposed on the optical transmission line, wherein the sending power of optical signals to be inserted at each of the plurality of node apparatuses is set such that the received levels of the optical signals sent out from the plurality of node apparatuses and received at the input of the optical amplifier become equal.Type: ApplicationFiled: May 29, 2003Publication date: December 11, 2003Applicant: FUJITSU LIMITEDInventors: Hideyuki Miyata, Hiroaki Tomofuji, Hiroshi Onaka
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Publication number: 20030210915Abstract: The present invention relates to an optical communication apparatus for detecting the intensity of light in an optical modulator or the intensity of a modulation signal and for controlling the operating point of the optical modulator based on the result of detection. In the optical communication apparatus having such a configuration, the operating point of the optical modulator can be kept stable even when the input light or the modulation signal is temporarily non-existent in the optical communication apparatus.Type: ApplicationFiled: June 19, 2003Publication date: November 13, 2003Applicant: Fujitsu LimitedInventors: Hideyuki Miyata, Hiroshi Onaka