Patents by Inventor Daisaku Ogasahara
Daisaku Ogasahara 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: 20230361882Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: July 13, 2023Publication date: November 9, 2023Applicant: NEC CORPORATIONInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 11750298Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: December 20, 2022Date of Patent: September 5, 2023Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20230119734Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: December 20, 2022Publication date: April 20, 2023Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 11588558Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: December 21, 2021Date of Patent: February 21, 2023Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20220116121Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: December 21, 2021Publication date: April 14, 2022Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 11233575Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: October 22, 2020Date of Patent: January 25, 2022Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20210044362Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: October 22, 2020Publication date: February 11, 2021Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 10833771Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: March 3, 2020Date of Patent: November 10, 2020Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20200204268Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: March 3, 2020Publication date: June 25, 2020Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 10615882Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: September 26, 2019Date of Patent: April 7, 2020Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20200021367Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: September 26, 2019Publication date: January 16, 2020Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 10454590Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: January 3, 2019Date of Patent: October 22, 2019Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Publication number: 20190140743Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Applicant: NEC CorporationInventors: Daisaku OGASAHARA, Junichi ABE
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Patent number: 10218447Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.Type: GrantFiled: October 23, 2014Date of Patent: February 26, 2019Assignee: NEC CORPORATIONInventors: Daisaku Ogasahara, Junichi Abe
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Patent number: 9923641Abstract: An optical receiver (20) includes an electrical signal generation unit (200), a first phase compensation unit (101), a distortion compensation unit (102), and a first dispersion compensation unit (400). The electrical signal generation unit (200) generates an electrical signal on the basis of received signal light. The first phase compensation unit (101) performs a phase rotation compensation process on the electrical signal generated by the electrical signal generation unit (200). The distortion compensation unit (102) performs a dispersion compensation process and a phase rotation compensation process in this order, at least once, on the electrical signal after having compensation performed thereon by the first phase compensation unit. The electrical signal generation unit (200), the first phase compensation unit (101), and the distortion compensation unit (102) are incorporated into one semiconductor device.Type: GrantFiled: September 19, 2013Date of Patent: March 20, 2018Assignee: NEC CORPORATIONInventors: Wakako Yasuda, Junichi Abe, Daisaku Ogasahara
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Frequency deviation compensation scheme, frequency deviation compensation method, and storage medium
Patent number: 9913234Abstract: Because a phase offset occurs between adjoining input blocks of multiple divided blocks when the amount of frequency deviation compensation is dynamically changed, there is the possibility that a restored bit string contains an error. This frequency deviation compensation scheme is equipped with: a frequency deviation compensation means for compensating for a frequency deviation in a frequency-domain signal; and a phase offset compensation means for compensating for a phase offset caused to the signal due to change in an amount of compensation during the frequency compensation.Type: GrantFiled: July 22, 2014Date of Patent: March 6, 2018Assignee: NEC CORPORATIONInventor: Daisaku Ogasahara -
Patent number: 9819525Abstract: To provide signal generating apparatus that is capable of controlling the DC bias of the optical modulator applicable to various kinds of modulation format, a signal processing apparatus includes a digital processing unit for deserializing an input digital data into parallel data lanes, for comparing the value of the digital data of symbol rate F to at least one predetermined threshold value, for selecting an offset value based on the result of the comparison; and for adding the selected offset value to the digital data, a converting unit for converting the digital data added the offset value to analog signals in each lane; an optical modulating unit for modulating a lightwave according to the analog signals with predetermined modulation format at the symbol rate F, where the modulated signal contains a frequency component at F/N.Type: GrantFiled: July 31, 2013Date of Patent: November 14, 2017Assignee: NEC CORPORATIONInventors: Emmanuel Le Taillandier De Gabory, Daisaku Ogasahara, Shinsuke Fujisawa
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Patent number: 9722697Abstract: A polarization demultiplexing optical communication receiver is provided with a signal quality change imparting means which imparts a signal quality change to multiplexed two optical signals; and a signal quality monitoring means which compares signal qualities of the two optical signals with each other after the multiplexed two optical signals imparted with the signal quality change are subjected to polarization separation so as to specify the two optical signals based on a result of the comparison. This makes it possible to reduce transmission characteristics degradation of a polarization-multiplexed optical signal, and to implement transmission having high reliability.Type: GrantFiled: January 17, 2014Date of Patent: August 1, 2017Assignee: NEC CORPORATIONInventor: Daisaku Ogasahara
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Patent number: 9660762Abstract: A method for transmitting optical signals over multiple channels is provided, the method including: coding tributaries of data to be transmitted; firstly rearranging the coded tributaries, thereby scrambling the data among the coded tributaries and outputting rearranged coded tributaries; modulating optical carriers with data from one of the coded tributaries, creating modulated optical signals; transmitting the modulated optical signals; spatially multiplexing the modulated optical signals into spatially multiplexed channels; converting the spatially multiplexed optical signals into individual optical signals; receiving the individual optical signals through the multiple channels; demodulating the individual optical signals into electrical signals; decoding the electrical signals into decoded tributaries; and secondly rearranging the decoded of tributaries to recover the tributaries of data before step, wherein, a number of tributaries of data is equal to or more than two and is less than or equal to a numbeType: GrantFiled: September 6, 2012Date of Patent: May 23, 2017Assignee: NEC CORPORATIONInventors: Emmanuel Le Taillandier De Gabory, Manabu Arikawa, Toshiharu Ito, Daisaku Ogasahara
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Patent number: 9608732Abstract: It becomes difficult to regenerate transmitting signals depending on modulation systems for the optical phase modulation in a polarization multiplexed optical communication system employing the optical digital coherent communication system, therefore, an optical transmitter according to an exemplary aspect of the invention includes first optical quadrature modulation means for performing a phase modulation on a first continuous light beam and outputting a first transmitting light beam; second optical quadrature modulation means for performing a phase modulation on a second continuous light beam belonging in the same frequency band as that of the first continuous light beam and outputting a second transmitting light beam; optical phase difference adding means for adding an optical phase difference varying temporally between the first transmitting light beam and the second transmitting light beam; and polarization multiplexing means for polarization-multiplexing the first transmitting light beam and the secondType: GrantFiled: February 13, 2013Date of Patent: March 28, 2017Assignee: NEC CORPORATIONInventor: Daisaku Ogasahara