公开(公告)号：US20230216589A1

公开(公告)日：2023-07-06

申请号：US18019013

申请日：2020-08-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Koki SHIBAHARA ,  Takayuki MIZUNO ,  Yutaka MIYAMOTO

IPC分类号： H04B10/2581 ,  H04J14/04 ,  H04B10/60

CPC分类号： H04B10/2581 ,  H04J14/04 ,  H04B10/60

摘要： The signal detection device includes the signal detection unit that derives the estimation vector of the transmission signal vector,
the first conversion unit that converts the estimation vector of the transmission signal vector to the estimation vector of the transmission signal vector based on the reduced basis, the first determination unit that converts the estimation vector of the transmission signal vector based on the reduced basis to the determination value vector of the transmission signal vector, the first update unit that updates the separation matrix, the second conversion unit that converts the first error signal vector to the second error signal vector based on the reduced basis, the second update unit that updates the error covariance matrix based on the reduced basis, the second determination unit that determines whether or not the predetermined condition is satisfied, and a third update unit that updates the unimodular matrix, the inverse matrix of the unimodular matrix, and the error covariance matrix based on the reduced basis when it is determined that the predetermined condition is established.

公开(公告)号：US20230291471A1

公开(公告)日：2023-09-14

申请号：US18011573

申请日：2020-06-23

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yohei KATAYAMA ,  Kazumitsu SAKAMOTO ,  Kento YOSHIZAWA ,  Hiroyuki FUKUMOTO ,  Takuya OHARA ,  Takeshi KINOSHITA ,  Etsushi YAMAZAKI ,  Takayuki MIZUNO

IPC分类号： H04B10/112 ,  H04B10/2557

CPC分类号： H04B10/112 ,  H04B10/2557

摘要： A phase difference distribution estimation method includes: receiving an optical signal via a space and detecting a phase of the optical signal; calculating characteristic values related to characteristics of the atmosphere through which the optical signal propagates from the optical signal received in the receiving; estimating a phase difference distribution of an optical signal received after a certain period of time, on the basis of the characteristic values calculated in the calculating; and controlling a phase of an optical signal in the receiving on the basis of the phase difference distribution estimated in the estimating.

公开(公告)号：US20230057448A1

公开(公告)日：2023-02-23

申请号：US17800201

申请日：2020-02-19

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Koki SHIBAHARA ,  Takayuki MIZUNO ,  Yutaka MIYAMOTO

IPC分类号： H04B10/2581 ,  H04B10/61 ,  H04B10/2507

摘要： An optical transmission system including: N transmitters, each of the N transmitters being configured to convert one of N electrical signals indicating data sequences different from one another into an optical signal; a signal generator configured to cause N optical splitters to split the N optical signals output from the N transmitters to convert the N optical signals into M optical signals; a multiplexer configured to convert the M optical signals converted by the signal generator into one mode-multiplexed signal that is excitable in at least M modes; a demultiplexer configured to convert the mode-multiplexed signal converted by the multiplexer into M optical signals; M receivers, each of the M receivers being configured to convert one of the M optical signals converted by the demultiplexer into the electrical signal; and a signal detector configured to perform signal separation on the M electrical signals converted by the M receivers to extract the N data sequences.

公开(公告)号：US20210218477A1

公开(公告)日：2021-07-15

申请号：US17197754

申请日：2021-03-10

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Kohki SHIBAHARA ,  Takayuki MIZUNO ,  Akira ISODA ,  Yutaka MIYAMOTO

IPC分类号： H04B10/69 ,  H04B1/10 ,  H04B10/2581 ,  H04J14/04 ,  H04J14/06

摘要： A signal receiving apparatus includes at least one signal separating apparatus that separates a specific signal from a plurality of received signals. Each of the at least one signal separating apparatus includes a spatial filtering unit that separates at least one equalized signal and a decision signal outputting unit that generates a first decision signal by deciding the equalized signal and outputs the generated first decision signal. The spatial filtering unit separates the at least one equalized signal by multiplying at least the plurality of received signals among the plurality of received signals and either the first decision signal output from the decision signal outputting unit or a second decision signal output from another signal separating apparatus by predetermined weighting coefficients.

公开(公告)号：US20200381888A1

公开(公告)日：2020-12-03

申请号：US16640242

申请日：2018-08-24

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takayuki MIZUNO ,  Akira ISODA ,  Kohki SHIBAHARA ,  Mitsunori FUKUTOKU ,  Yutaka MIYAMOTO

IPC分类号： H01S3/23 ,  H01S3/30 ,  H01S3/0941 ,  H01S3/094 ,  H01S3/067 ,  H01S3/16 ,  H04B10/297

摘要： An optically amplified repeater system includes optical transmission paths, a multi-channel optical amplifier, one or more Raman amplification pumping light sources, and a wavelength multiplexer. The multi-channel optical amplifier includes K simultaneous pumping light sources, N optical amplification media, and one or more optical couplers, and simultaneously amplifies, with the K simultaneous pumping light sources, light intensities of optical signals that pass through the N optical amplification media and propagate through the optical transmission paths. Light intensities of the wavelength band of the optical signals is Raman amplified by the Raman amplification pumping light. A light intensity of the Raman amplification pumping light output from the one or more Raman amplification pumping light sources is determined in accordance with characteristic differences between the optical signals passing through the optical transmission paths.

公开(公告)号：US20200014469A1

公开(公告)日：2020-01-09

申请号：US16492917

申请日：2018-03-08

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Kohki SHIBAHARA ,  Takayuki MIZUNO ,  Akira ISODA ,  Yutaka MIYAMOTO

IPC分类号： H04B10/69 ,  H04B1/10 ,  H04B10/2581 ,  H04J14/06 ,  H04J14/04

摘要： A signal receiving apparatus includes at least one signal separating apparatus that separates a specific signal from a plurality of received signals. Each of the at least one signal separating apparatus includes a spatial filtering unit that separates at least one equalized signal and a decision signal outputting unit that generates a first decision signal by deciding the equalized signal and outputs the generated first decision signal. The spatial filtering unit separates the at least one equalized signal by multiplying at least the plurality of received signals among the plurality of received signals and either the first decision signal output from the decision signal outputting unit or a second decision signal output from another signal separating apparatus by predetermined weighting coefficients.

公开(公告)号：US20230224036A1

公开(公告)日：2023-07-13

申请号：US18009382

申请日：2020-06-15

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Kazumitsu SAKAMOTO ,  Yohei KATAYAMA ,  Kento YOSHIZAWA ,  Takeshi KINOSHITA ,  Etsushi YAMAZAKI ,  Takayuki MIZUNO ,  Takuya OHARA

IPC分类号： H04B10/112

CPC分类号： H04B10/1129 ,  H04B10/1123

摘要： A switching instructor outputs a beacon light selection notification signal when a optical transceiver transmits a optical wireless signal of a beacon light and outputs a signal light selection notification signal when the optical transceiver transmits the optical wireless signal of the signal light. A spatial light modulator controller performs switching of a control signal given to each of the plurality of pixels of a spatial light modulator to: cause a phase delay in light received by each of the plurality of pixels of the spatial light modulator when the switching instructor outputs the beacon light selection notification signal and cause a phase delay in light received by each of the plurality of pixels of the spatial light modulator when the switching instructor outputs the signal light selection notification signal.

公开(公告)号：US20220329343A1

公开(公告)日：2022-10-13

申请号：US17638830

申请日：2019-09-06

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Koki SHIBAHARA ,  Takayuki MIZUNO ,  Yutaka MIYAMOTO

IPC分类号： H04J14/04 ,  H04B10/60

摘要： An optical signal processing apparatus of an embodiment is an optical signal processing apparatus for separating and detecting an optical signal transmitted in a mode division multiplexing optical communication method by signal processing based on a multi-input multi-output (MIMO)-type linear filter. The device includes a signal processing unit configured to estimate weighting factors of the MIMO-type linear filter by sequential calculation based on an affine projection method. In the sequential calculation of the signal processing device, an output signal by the sequential calculation is expressed by a correlation vector indicating a correlation between the plurality of input signals, a smoothing prefilter vector indicating, of smoothing prefilter factors indicating a relationship between the weighting factors at current time and input signals from a first time being a past predetermined time to the current time, smoothing prefilter factors corresponding to each time from the first time to a second time that corresponds to an affine projection order in the affine projection method, and input signals from the first time to the second time.

公开(公告)号：US20210376924A1

公开(公告)日：2021-12-02

申请号：US17263733

申请日：2019-08-15

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Akira ISODA ,  Takayuki MIZUNO ,  Koki SHIBAHARA ,  Takayuki KOBAYASHI ,  Yutaka MIYAMOTO

IPC分类号： H04B10/077 ,  H04J14/06 ,  H04B10/25

摘要： A crosstalk estimation system includes: a light source unit that generates a polarization-multiplexed light, which is a polarized light having multiplexed polarizations, of each wavelength in a sideband of a modulated signal and emits the polarization-multiplexed light of each wavelength; a multiplexer that multiplexes the modulated signal with the polarization-multiplexed light for each core, which is associated with one of the wavelengths; a transmission line that transmits the modulated signal multiplexed with the polarization-multiplexed light of each wavelength through a different core; a separation unit that separates the polarization-multiplexed light from the modulated signal multiplexed with the polarization-multiplexed light for each core; a measurement unit that generates light intensity data on the polarization-multiplexed light of each wavelength; and an estimation unit that estimates a crosstalk between the cores based on a difference in light intensity between the polarization-multiplexed light of the wavelengths.

公开(公告)号：US20210013985A1

公开(公告)日：2021-01-14

申请号：US16971856

申请日：2019-02-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Koki SHIBAHARA ,  Takayuki MIZUNO ,  Yutaka MIYAMOTO

IPC分类号： H04J14/04 ,  H04B10/2581 ,  H04Q11/00

摘要： An optical transmission system includes a plurality of transmission paths that transmit a mode multiplexing signal, and one or more mode permutation units provided between the transmission paths. The mode permutation unit performs mode permutation to interchange modes to be used between at least some optical signals among respective optical signals of a plurality of types of modes that are multiplexed to the mode multiplexing signal input from the transmission path on an input side, and outputs the mode multiplexing signal subjected to the mode permutation to the transmission path on an output side.