Patents by Inventor Makoto Ohtou
Makoto Ohtou 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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Patent number: 9755748Abstract: A transmission apparatus includes: a data signal processor to add first data of a control signal to a data signal received, and transmit the data signal; a first signal output module to output second data of the control signal; an update controller to control an update of a function included in the first signal output module; and a second signal output module, when receiving a notice of an instruction for updating the function from the update controller, to output the first data that is the second data held therein when the notice thereof is received, wherein the second signal output module, when receiving a notice of a completion for updating the function from the update controller, outputs the first data that is the second data received from the first signal output module updated by the update controller.Type: GrantFiled: October 28, 2014Date of Patent: September 5, 2017Assignee: FUJITSU LIMITEDInventors: Makoto Ohtou, Mitsuo Yoneda
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Publication number: 20150043914Abstract: A transmission apparatus includes: a data signal processor to add first data of a control signal to a data signal received, and transmit the data signal; a first signal output module to output second data of the control signal; an update controller to control an update of a function included in the first signal output module; and a second signal output module, when receiving a notice of an instruction for updating the function from the update controller, to output the first data that is the second data held therein when the notice thereof is received, wherein the second signal output module, when receiving a notice of a completion for updating the function from the update controller, outputs the first data that is the second data received from the first signal output module updated by the update controller.Type: ApplicationFiled: October 28, 2014Publication date: February 12, 2015Inventors: Makoto OHTOU, Mitsuo YONEDA
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Patent number: 8903248Abstract: A transmission apparatus includes: a data signal processor to add first data of a control signal to a data signal received, and transmit the data signal; a first signal output module to output second data of the control signal; an update controller to control an update of a function included in the first signal output module; and a second signal output module, when receiving a notice of an instruction for updating the function from the update controller, to output the first data that is the second data held therein when the notice thereof is received, wherein the second signal output module, when receiving a notice of a completion for updating the function from the update controller, outputs the first data that is the second data received from the first signal output module updated by the update controller.Type: GrantFiled: August 17, 2011Date of Patent: December 2, 2014Assignee: Fujitsu LimitedInventor: Makoto Ohtou
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Patent number: 8666243Abstract: An optical transmission device that is installed at a node of a network and that performs transmission of an optical signal transmits the optical signal to an optical transmission device at the next node without amplifying the optical signal. The optical transmission device generates an adjustment optical signal used by a reception-side optical amplifier in the optical transmission device at the next node to adjust gain for a transmission loss of the optical signal. At the time of booting of the optical transmission device, the optical transmission device transmits the generated adjustment optical signal to the reception-side optical amplifier in the optical transmission device at the next node. Upon receiving a gain-adjustment-completion signal for notifying completion of gain adjustment using the adjustment optical signal from the reception-side optical amplifier, the optical transmission device controls the transmission of the adjustment optical signal to be stopped.Type: GrantFiled: January 30, 2008Date of Patent: March 4, 2014Assignee: Fujitsu LimitedInventors: Seiji Sugiyama, Akira Yamamoto, Makoto Ohtou, Koji Bato
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Patent number: 8331787Abstract: Even during a protection period in which a state transition is not caused from an ALC state to an ALD state, when an output light level that is inputted is below a threshold for ALC transition read from a memory, a processor causes a transition by switching an internal state from an ALC state to an ALD state. Then, an ALD operation is started, outputting a control voltage to a VAT control unit so as to achieve a predetermined fixed attenuation amount.Type: GrantFiled: March 30, 2009Date of Patent: December 11, 2012Assignee: Fujitsu LimitedInventors: Takeshi Noma, Haruki Tanaka, Yoshikazu Nakanishi, Makoto Ohtou, Hideaki Sugiya, Ichiro Nakajima, Toshihiro Suzuki
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Optical wavelength multiplexing system, optical wavelength multiplexing method, and computer product
Patent number: 8195052Abstract: An optical wavelength multiplexing system includes transmission-side and reception-side optical wavelength multiplexers, and terminal devices, which are connected to each other by optical fiber cables. Optical wavelength converters in the transmission-side optical wavelength multiplexers are connected to ports respectively. The optical wavelength converter converts an input optical signal into an arbitrary preset wavelength to generate a converted optical signal. The port has a predetermined wavelength preset therein. Each optical power level of input converted optical signals is compared with each optical power level of optical signals of respective wavelengths set in the ports. When a difference is detected in the comparison result, it is determined that an optical wavelength converter is incorrectly connected to the port.Type: GrantFiled: December 6, 2007Date of Patent: June 5, 2012Assignee: Fujitsu LimitedInventors: Makoto Ohtou, Akira Yamamoto, Tatsuo Nagayoshi, Katsumi Sugawa, Hideaki Sugiya -
Publication number: 20120051746Abstract: A transmission apparatus includes: a data signal processor to add first data of a control signal to a data signal received, and transmit the data signal; a first signal output module to output second data of the control signal; an update controller to control an update of a function included in the first signal output module; and a second signal output module, when receiving a notice of an instruction for updating the function from the update controller, to output the first data that is the second data held therein when the notice thereof is received, wherein the second signal output module, when receiving a notice of a completion for updating the function from the update controller, outputs the first data that is the second data received from the first signal output module updated by the update controller.Type: ApplicationFiled: August 17, 2011Publication date: March 1, 2012Applicant: FUJITSU LIMITEDInventors: Makoto OHTOU, Mitsuo Yoneda
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Patent number: 7733467Abstract: An identification apparatus for identifying an optical passive device product. The apparatus includes an optical input output monitor section for monitoring an optical input and an optical output of the optical passive device product respectively; a loss calculation section for calculating a loss in the optical passive device product based on a monitoring result of the optical input output monitor section; and a product identification section in which product information indicating a correspondence between a loss characteristic and a product has been stored in advance, and which identifies the optical passive device product by comparing the stored product information and the loss calculated by the loss calculation section.Type: GrantFiled: March 7, 2008Date of Patent: June 8, 2010Assignee: Fujitsu LimitedInventors: Tatsuo Nagayoshi, Akira Yamamoto, Katsumi Sugawa, Makoto Ohtou, Takuji Maeda
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Publication number: 20090310969Abstract: Even during a protection period in which a state transition is not caused from an ALC state to an ALD state, when an output light level that is inputted is below a threshold for ALC transition read from a memory, a processor causes a transition by switching an internal state from an ALC state to an ALD state. Then, an ALD operation is started, outputting a control voltage to a VAT control unit so as to achieve a predetermined fixed attenuation amount.Type: ApplicationFiled: March 30, 2009Publication date: December 17, 2009Applicant: Fujitsu LimitedInventors: Takeshi NOMA, Haruki TANAKA, Yoshikazu NAKANISHI, Makoto OHTOU, Hideaki SUGIYA, Ichiro NAKAJIMA, Toshihiro SUZUKI
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Publication number: 20090116834Abstract: An apparatus comprises an optical level controller for autonomously controlling an optical device such that an optical level of the supplied optical signal becomes an objective level, and a controlled variable storer for storing a controlled variable in storage if a restart is required, the optical level controller providing the controlled variable to control the optical signal, wherein the optical level controller starts the control of optical device after the restart while the controlled variable stored in the storage by the controlled variable storer is set at an initial value.Type: ApplicationFiled: September 22, 2008Publication date: May 7, 2009Applicant: FUJITSU LIMITEDInventors: Katsumi Sugawa, Makoto Ohtou, Akira Yamamoto
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Publication number: 20080292318Abstract: An optical transmission device that is installed at a node of a network and that performs transmission of an optical signal transmits the optical signal to an optical transmission device at the next node without amplifying the optical signal. The optical transmission device generates an adjustment optical signal used by a reception-side optical amplifier in the optical transmission device at the next node to adjust gain for a transmission loss of the optical signal. At the time of booting of the optical transmission device, the optical transmission device transmits the generated adjustment optical signal to the reception-side optical amplifier in the optical transmission device at the next node. Upon receiving a gain-adjustment-completion signal for notifying completion of gain adjustment using the adjustment optical signal from the reception-side optical amplifier, the optical transmission device controls the transmission of the adjustment optical signal to be stopped.Type: ApplicationFiled: January 30, 2008Publication date: November 27, 2008Applicant: FUJITSU LIMITEDInventors: Seiji Sugiyama, Akira Yamamoto, Makoto Ohtou, Koji Bato
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Publication number: 20080231843Abstract: An identification apparatus for identifying an optical passive device product. The apparatus includes an optical input output monitor section for monitoring an optical input and an optical output of the optical passive device product respectively; a loss calculation section for calculating a loss in the optical passive device product based on a monitoring result of the optical input output monitor section; and a product identification section in which product information indicating a correspondence between a loss characteristic and a product has been stored in advance, and which identifies the optical passive device product by comparing the stored product information and the loss calculated by the loss calculation section.Type: ApplicationFiled: March 7, 2008Publication date: September 25, 2008Applicant: Fujitsu LimitedInventors: Tatsuo NAGAYOSHI, Akira YAMAMOTO, Katsumi SUGAWA, Makoto OHTOU, Takuji MAEDA
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Optical wavelength multiplexing system, optical wavelength multiplexing method, and computer product
Publication number: 20080138074Abstract: An optical wavelength multiplexing system includes transmission-side and reception-side optical wavelength multiplexers, and terminal devices, which are connected to each other by optical fiber cables. Optical wavelength converters in the transmission-side optical wavelength multiplexers are connected to ports respectively. The optical wavelength converter converts an input optical signal into an arbitrary preset wavelength to generate a converted optical signal. The port has a predetermined wavelength preset therein. Each optical power level of input converted optical signals is compared with each optical power level of optical signals of respective wavelengths set in the ports. When a difference is detected in the comparison result, it is determined that an optical wavelength converter is incorrectly connected to the port.Type: ApplicationFiled: December 6, 2007Publication date: June 12, 2008Applicant: FUJITSU LIMITEDInventors: Makoto Ohtou, Akira Yamamoto, Tatsuo Nagayoshi, Katsumi Sugawa, Hideaki Sugiya