Patents by Inventor Yasushi Sugaya
Yasushi Sugaya 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).
-
Patent number: 9698902Abstract: An optical transmission system includes: a first optical transmission device configured to transmit measurement light to an optical transmission line on a first direction; and a second optical transmission device configured, when an optical transmission characteristic is measured, to loop-back the measurement light received from the first optical transmission device through an optical transmission line on the first direction and to transmit the measurement light to the first optical transmission device through an optical transmission line on a second direction, wherein, when the optical transmission characteristic is measured, the first optical transmission device receives the measurement light loop-backed by the second optical transmission device and measures the optical transmission characteristic between the first optical transmission device and the second optical transmission device.Type: GrantFiled: June 11, 2015Date of Patent: July 4, 2017Assignee: FUJITSU LIMITEDInventors: Kentaro Nakamura, Satoru Okano, Yasushi Sugaya
-
Publication number: 20150381272Abstract: An optical transmission system includes: a first optical transmission device configured to transmit measurement light to an optical transmission line on a first direction; and a second optical transmission device configured, when an optical transmission characteristic is measured, to loop-back the measurement light received from the first optical transmission device through an optical transmission line on the first direction and to transmit the measurement light to the first optical transmission device through an optical transmission line on a second direction, wherein, when the optical transmission characteristic is measured, the first optical transmission device receives the measurement light loop-backed by the second optical transmission device and measures the optical transmission characteristic between the first optical transmission device and the second optical transmission device.Type: ApplicationFiled: June 11, 2015Publication date: December 31, 2015Applicant: FUJITSU LIMITEDInventors: Kentaro NAKAMURA, Satoru OKANO, Yasushi SUGAYA
-
Patent number: 9143264Abstract: An optical transmission device includes: an optical signal generator to generate and transmit an optical signal that transmits data; a detector to detect a number of active clients; and a processor to determine transmission rate of the optical signal according to the number of active clients and quality of the optical signal at an optical receiver.Type: GrantFiled: July 28, 2011Date of Patent: September 22, 2015Assignee: FUJITSU LIMITEDInventor: Yasushi Sugaya
-
Patent number: 9007680Abstract: An optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal; a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal; a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal; and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain.Type: GrantFiled: September 5, 2013Date of Patent: April 14, 2015Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Susumu Kinoshita
-
Patent number: 8923694Abstract: An optical receiving device includes: an optical amplifier configured to amplify a wavelength multiplexed optical signal; a demultiplexer configured to demultiplex the amplified wavelength multiplexed signal into optical signals of a plurality of wavelengths; optical receivers configured to regenerate the demultiplexed optical signals; error correction units configured to correct a bit error in the regenerated optical signals; and main control unit. The control unit adjusts RXDTV of the optical receiver for receiving optical signals of a given wavelength to the optimal value in the state where the gain of the optical amplifier is lowered from that of a normal operation such that the occurrence of bit errors in the optical signals of the other wavelengths does not exceed the correction capability of the error correction unit.Type: GrantFiled: February 4, 2013Date of Patent: December 30, 2014Assignees: Fujitsu Telecom Networks Limited, Fujitsu LimitedInventors: Toshiki Honda, Takehiro Fujita, Yasushi Sugaya
-
Patent number: 8699126Abstract: A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.Type: GrantFiled: October 25, 2012Date of Patent: April 15, 2014Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Miki Takeda, Susumu Kinoshita, Terumi Chikama
-
Patent number: 8681420Abstract: An optical transmission system includes an optical transmitter that sends signal light to a transmission path, an optical receiver that receives the signal light from the transmission path, and an optical amplifier that is provided on the transmission path and that amplifies the signal light, the optical amplifier being configured to control a gain characteristic of the optical amplifier such that a power of signal light having a wavelength included within a wavelength range in which polarization hole burning occurs is higher than a power of another signal light having a wavelength outside the wavelength range.Type: GrantFiled: June 27, 2011Date of Patent: March 25, 2014Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Takehiro Fujita
-
Publication number: 20140043675Abstract: An optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal; a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal; a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal; and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain.Type: ApplicationFiled: September 5, 2013Publication date: February 13, 2014Applicant: Fujitsu LimitedInventors: Yasushi SUGAYA, Susumu KINOSHITA
-
Patent number: 8615167Abstract: A WDM optical transmission system includes a plurality of optical nodes optically coupled by a transmission line, a processor that is operative to calculate an amount of adjustment of a reception level capable of increasing an optical signal-to-noise ratio for each channel of the WDM light reaching the optical node positioned at a receiving end of the unit section based on information on amplification operation of the WDM light in at least one optical-amplification repeating node disposed on the optical transmission line in the unit section, and to adjust a power level corresponding to each channel of the WDM light transmitted on the transmission line from the optical node positioned at a transmission end of the unit section in accordance with a calculation result of the calculation.Type: GrantFiled: September 12, 2011Date of Patent: December 24, 2013Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Takehiro Fujita, Satoru Okano
-
Publication number: 20130268100Abstract: A manipulation control apparatus includes a first obtaining unit which obtains manipulation information for indicating user manipulation, and a first control unit which performs control according to the manipulation indicated by the obtained manipulation information. Also, the manipulation control apparatus additionally includes a storage unit which stores condition information for indicating a condition that is valid when a user manipulation is highly likely to be performed again. In addition, the manipulation control apparatus includes a preserve unit which preserves the manipulation information in the storage unit when the manipulation indicated by the obtained manipulation information satisfies a condition indicated by stored condition information.Type: ApplicationFiled: December 27, 2011Publication date: October 10, 2013Applicant: JVC KENWOOD CORPORATIONInventors: Satoru Miyata, Tsuyoshi Yamaguchi, Seiji Agata, Takeharu Uchida, Yasushi Sugaya
-
Patent number: 8553319Abstract: An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a variable light transmissivity. Prior to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal prior to the varying the number of channels. While the number of channels in the light signal is being varied, the controller maintains the light transmissivity of the optical attenuator to be constant.Type: GrantFiled: April 29, 2011Date of Patent: October 8, 2013Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Susumu Kinoshita
-
Publication number: 20130251367Abstract: An optical transmission device includes: a controller that controllably extends a pass band of an optical transmission path for transmission of a known symbol sequence; and a transmission processing unit that provides the known symbol sequence after the controller controllably extends the pass band.Type: ApplicationFiled: January 28, 2013Publication date: September 26, 2013Applicant: FUJITSU LIMITEDInventors: Shigeru Ishii, Yasushi Sugaya
-
Patent number: 8320040Abstract: A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.Type: GrantFiled: July 6, 2011Date of Patent: November 27, 2012Assignee: Fujitsu LimitedInventors: Yasushi Sugaya, Miki Takeda, Susumu Kinoshita, Terumi Chikama
-
Patent number: 8248689Abstract: To obtain automatic gain control with high accuracy by including first and second light monitors, a reference light supplying unit supplying reference light of which wavelength is set within a gain band of a distributed Raman amplification and out of a wavelength band of main signal light to the optical transmission path, a first reference light monitor monitoring a power of the reference light input to the optical transmission path from one end side thereof, a second reference light monitor monitoring the power of the reference light output from the other end side of the optical transmission path, and a controlling unit controlling supply of pump light in a pump light supplying unit as well as supervising a state of the optical transmission path, based on monitor results from the first and second light monitor and the monitor results in the first and second reference light monitors.Type: GrantFiled: October 20, 2008Date of Patent: August 21, 2012Assignee: Fujitsu LimitedInventors: Masanori Kondoh, Yasushi Sugaya, Togo Fukushi, Miki Onaka, Kiyotoshi Noheji
-
Patent number: 8200090Abstract: An aspect of the embodiments utilizes an optical transmission apparatus which includes a rough adjustment execution portion that monitors a bit error rate of an optical signal for set values of a dispersion compensator where the set values have been set less closely to each other within a dispersion compensation control range than when a wavelength dispersion value set in the dispersion compensator is determined, and carries out a rough adjustment to determine a comparison threshold value used to set the wavelength dispersion value based on the monitored bit error rate, and a fine adjustment execution portion that monitors the bit error rate for the dispersion compensator the set values have been set more closely to each other, and carries out an adjustment to determine a wavelength dispersion value corresponding to the midpoint between the two acquired bit error rates as the wavelength dispersion value of the dispersion compensator.Type: GrantFiled: September 16, 2009Date of Patent: June 12, 2012Assignee: Fujitsu LimitedInventors: Yuichiro Sakane, Ryuta Hoshi, Akira Yamamoto, Tsutomu Tsurumi, Yasushi Sugaya, Tomoyuki Sakata, Kouichi Maeda, Hiromu Yoshii
-
Publication number: 20120106971Abstract: An optical transmission device includes: an optical signal generator to generate and transmit an optical signal that transmits data; a detector to detect a number of active clients; and a processor to determine transmission rate of the optical signal according to the number of active clients and quality of the optical signal at an optical receiver.Type: ApplicationFiled: July 28, 2011Publication date: May 3, 2012Applicant: FUJITSU LIMITEDInventor: Yasushi SUGAYA
-
Publication number: 20120063771Abstract: A WDM optical transmission system includes a plurality of optical nodes optically coupled by a transmission line, a processor that is operative to calculate an amount of adjustment of a reception level capable of increasing an optical signal-to-noise ratio for each channel of the WDM light reaching the optical node positioned at a receiving end of the unit section based on information on amplification operation of the WDM light in at least one optical-amplification repeating node disposed on the optical transmission line in the unit section, and to adjust a power level corresponding to each channel of the WDM light transmitted on the transmission line from the optical node positioned at a transmission end of the unit section in accordance with a calculation result of the calculation.Type: ApplicationFiled: September 12, 2011Publication date: March 15, 2012Applicant: FUJITSU LIMITEDInventors: Yasushi SUGAYA, Takehiro FUJITA, Satoru OKANO
-
Publication number: 20120002270Abstract: An optical transmission system includes an optical transmitter that sends signal light to a transmission path, an optical receiver that receives the signal light from the transmission path, and an optical amplifier that is provided on the transmission path and that amplifies the signal light, the optical amplifier being configured to control a gain characteristic of the optical amplifier such that a power of signal light having a wavelength included within a wavelength range in which polarization hole burning occurs is higher than a power of another signal light having a wavelength outside the wavelength range.Type: ApplicationFiled: June 27, 2011Publication date: January 5, 2012Applicant: FUJITSU LIMITEDInventors: Yasushi SUGAYA, Takehiro Fujita
-
Patent number: 8068730Abstract: A WDM signal monitoring system includes a measuring unit that measures power levels in a plurality of predetermined wavelength bands about a wavelength division multiplex signal, a waveform determination unit that determines an approximate waveform of each channel from each bit rate and modulation system of a plurality of channels which forms a wavelength division multiplex signal, and an approximation unit that determines a power level and a wavelength of each channel by approximating the power level in a plurality of wavelength bands which the measuring unit measured with the approximate waveform of each channel which the waveform determination unit determined.Type: GrantFiled: July 29, 2008Date of Patent: November 29, 2011Assignee: Fujitsu LimitedInventors: Yoshito Kachita, Ichiro Nakajima, Yasushi Sugaya, Ryosuke Goto
-
Patent number: 8064130Abstract: It is an object of the present invention to provide an optical amplifier using optical amplification mediums each doped with a rare earth element for increasing amplification efficiency of signal light in S-band and the like. To this end, the optical amplifier is constituted such that, when performing optical amplification for S-band and the like in which a center wavelength of a gain peak in the optical amplification medium is located at an outside of a signal band, a gain coefficient of when a pumping condition of the optical amplification medium is maximum is set so that a parameter ? obtained by dividing a minimum value of the gain coefficient in the signal band by a maximum value of the gain coefficient outside of the signal band becomes a previously set value or more, wherein, for example, the parameter ? can be increased by controlling a temperature of each of a plurality of EDFs between which gain equalizers are disposed.Type: GrantFiled: January 27, 2003Date of Patent: November 22, 2011Assignee: Fujitsu LimitedInventors: Masato Nishihara, Yasushi Sugaya, Etsuko Hayashi