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1. 发明专利

DE602004025713D1 未知
公开(公告)号：DE602004025713D1
公开(公告)日：2010-04-08
申请号：DE602004025713
申请日：2004-09-03
申请人： DEUTSCHE TELEKOM AG , NIPPON TELEGRAPH & TELEPHONE
发明人： WEIERSHAUSEN WERNER , MATTHEUS ARNOLD , LEPPLA RALPH , MIYAMOTO YUTAKA , HIRANO AKIRA , KISAKA YOSHIAKI
IPC分类号： H04B10/2569
摘要： The present invention proposes a method whereby during a specified/specifiable observation period (Ttotal) , the polarization states of optical transmission system and/or the optical signals transmitted by the optical transmission system are changed by applying a targeted intervention in at least one position of the transmission line, and at a second position which is interposed at least one place downstream from the first position of the optical transmission line, a specified/specifiable signal characteristic (BER) is qualitatively measured and checked for adherence to a specified/specifiable threshold condition (BERth) and the PMD-induced outage probability of the optical transmission system is calculated on the basis of the ratio between the length of that share of the time (Tout), during which the measured signal characteristic fails to meet the threshold condition (BERth), to the length of the observation period (Ttotal).

2. 发明专利

CA2977620A1 CHROMATIC DISPERSION ESTIMATING CIRCUIT, OPTICAL RECEPTION DEVICE AND CHROMATIC DISPERSION AMOUNT ESTIMATING METHOD 未知
公开(公告)号：CA2977620A1
公开(公告)日：2017-05-11
申请号：CA2977620
申请日：2016-10-04
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAZAKI ETSUSHI , TAKAMUKU TOMOHIRO , YOSHIDA YUKI , YOSHIDA MITSUTERU , SHIBAHARA KOKI , HORIKOSHI KENGO , KISAKA YOSHIAKI
IPC分类号： H04B10/079 , G01M11/02 , H04B3/06 , H04B10/2513
摘要： In the present invention, a Fourier transform unit (11) performs Fourier transform on a filter coefficient output from an adaptive equalization unit (6) that is constituted by a finite impulse response filter of N taps (N is an integer of 2 or more) in a time direction. An eigenvalue sum calculation unit (15) integrates the result of differentiating the Fourier-transformed filter coefficient by a frequency with a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and then calculates the sum of two eigenvalues of the matrix. A proportionality coefficient calculation unit (14) calculates a proportionality coefficient relative to the frequency from the sum of the two eigenvalues.

3. 发明专利

DE60037957T2 未知
公开(公告)号：DE60037957T2
公开(公告)日：2009-01-29
申请号：DE60037957
申请日：2000-09-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOMIZAWA MASAHITO , KISAKA YOSHIAKI , MIYAMOTO YUTAKA , ONO TAKASHI , TOBA HIROMU
IPC分类号： H04J3/16 , H04J14/02
摘要： A signal transport system and a transport method are provided. A whole lowspeed signal containing a client overhead received from a client network is transparently subjected to time division multiplexing and an additional overhead is inserted in the whole signal and further subjected to wavelength division multiplexing, so that the digital signal having the addition overhead is transported in the wavelength division mode represented by one wavelength to a receiving equipment.

4. 发明专利

DE60203983D1 未知
公开(公告)号：DE60203983D1
公开(公告)日：2005-06-09
申请号：DE60203983
申请日：2002-12-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOMIZAWA MASAHITO , HIRANO AKIRA , KISAKA YOSHIAKI , MIYAMOTO YUTAKA
IPC分类号： H03M13/43 , H04B10/2507 , H04B10/556 , H04L25/06
摘要： This digital transmission system is provided with a transmitting apparatus that transmits digital data signals and a receiving apparatus that receives the digital data signals transmitted over a transmission path, compares the signals with a predetermined threshold value, and performs decision reproduction. The receiving apparatus is formed by: decision circuits that receive the input of reception signals, discriminate between the respective reception signals using a plurality of threshold values, and output decision results; and a selection circuit that, based on the decision results output from the decision circuit, selects one decision result from one threshold value from among the decision results from each of the plurality of threshold values, and outputs the selected decision result. As a result, the receiving apparatus is able to individually select which decision result to use from which threshold value. More specifically, the receiving apparatus is formed by: k number (i.e., k x n) of decision circuit sets each having different threshold values, with one set formed by a plurality (n number) of decision circuits having the same threshold value; distribution circuits that distribute reception signals to the respective decision circuits; a selection circuit that selects and outputs one decision result from the decision circuits; and a control circuit that controls the selection circuit such that the input of the decision results is received from each decision circuit, a set in which the decision results of n number of decision circuits are the same is selected from all sets, and the decision result of one decision circuit from that one set is selected.

5. 发明专利

CA3040284A1 CHROMATIC DISPERSION COMPENSATION DEVICE, CHROMATIC DISPERSION COMPENSATION METHOD, AND COMMUNICATION DEVICE 未知
公开(公告)号：CA3040284A1
公开(公告)日：2018-06-07
申请号：CA3040284
申请日：2017-10-06
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA MITSUTERU , YAMAZAKI ETSUSHI , KISAKA YOSHIAKI , TOMIZAWA MASAHITO
IPC分类号： H04B10/2513 , H04B10/61
摘要： In the present invention a bandwidth division timing adjustment unit (10) aligns the timing of multiple signals in a time domain, said multiple signals being obtained by dividing a received signal for each of multiple frequency bands, and then combines the multiple signals the timing of which has been aligned. A wavelength dispersion compensation unit (17) compensates wavelength dispersion of an output signal from the bandwidth division timing adjustment unit (10) for each of the multiple frequency bands.

6. 发明专利

CA2983578A1 DATA PHASE TRACKING DEVICE, DATA PHASE TRACKING METHOD AND COMMUNICATION DEVICE 未知
公开(公告)号：CA2983578A1
公开(公告)日：2017-09-14
申请号：CA2983578
申请日：2017-01-16
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： ONUMA YASUHARU , TACHIBANA MASAHIRO , YAMAZAKI ETSUSHI , TAKEI KAZUHITO , YOSHIDA YUKI , IKEDA MASAYUKI , KISAKA YOSHIAKI , TOMIZAWA MASAHITO
IPC分类号： H04L7/00 , H03H17/02 , H03H17/06
摘要： A FIR filter (7) convolves sampling data, which is obtained by sampling a received signal, with a tap coefficient. A phase difference detection unit (8) detects the phase difference between the synchronization timing of a signal waveform estimated from an output signal from the FIR filter (7), and the output signal sampling timing. A tap-coefficient adjustment unit (9) causes the sampling timing of the output signal from the FIR filter (7) to track the synchronization timing, by adjusting the tap coefficient so as to decrease the phase difference detected by the phase difference detection unit (8).

7. 发明专利

DE60203983T2 未知
公开(公告)号：DE60203983T2
公开(公告)日：2006-01-19
申请号：DE60203983
申请日：2002-12-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOMIZAWA MASAHITO , HIRANO AKIRA , KISAKA YOSHIAKI , MIYAMOTO YUTAKA
IPC分类号： H03M13/43 , H04B10/2507 , H04B10/556 , H04L25/06
摘要： This digital transmission system is provided with a transmitting apparatus that transmits digital data signals and a receiving apparatus that receives the digital data signals transmitted over a transmission path, compares the signals with a predetermined threshold value, and performs decision reproduction. The receiving apparatus is formed by: decision circuits that receive the input of reception signals, discriminate between the respective reception signals using a plurality of threshold values, and output decision results; and a selection circuit that, based on the decision results output from the decision circuit, selects one decision result from one threshold value from among the decision results from each of the plurality of threshold values, and outputs the selected decision result. As a result, the receiving apparatus is able to individually select which decision result to use from which threshold value. More specifically, the receiving apparatus is formed by: k number (i.e., k x n) of decision circuit sets each having different threshold values, with one set formed by a plurality (n number) of decision circuits having the same threshold value; distribution circuits that distribute reception signals to the respective decision circuits; a selection circuit that selects and outputs one decision result from the decision circuits; and a control circuit that controls the selection circuit such that the input of the decision results is received from each decision circuit, a set in which the decision results of n number of decision circuits are the same is selected from all sets, and the decision result of one decision circuit from that one set is selected.

8. 发明专利

CA3012977C PHASE COMPENSATION DEVICE, PHASE COMPENSATION METHOD AND COMMUNICATION APPARATUS 未知
公开(公告)号：CA3012977C
公开(公告)日：2021-05-11
申请号：CA3012977
申请日：2017-04-13
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAZAKI ETSUSHI , NOUCHI HIROYUKI , ONUMA YASUHARU , TAKAMUKU TOMOHIRO , OYAMA KATSUICHI , TAKEI KAZUHITO , TOMIZAWA MASAHITO , KISAKA YOSHIAKI , YOSHIDA MITSUTERU , NAKAMURA MASANORI
IPC分类号： H04L27/01 , H04B10/61 , H04L27/38
摘要： A symbol phase difference compensation unit (6) calculates a first phase difference that is a phase difference between a known pattern extracted from a received signal and a true value thereof, and makes phase compensation for the received signal on the basis of the first phase difference. A provisional determination unit (12) provisionally determines an output signal of the symbol phase difference compensation unit (6) to find an estimated value of a phase. A phase difference acquisition unit (13) acquires a second phase difference that is a phase difference between the phase of the output signal and the estimated value of the phase found by the provisional determination unit (12). A phase difference compensation unit (14) makes phase compensation for the output signal on the basis of the second phase difference.

9. 发明专利

CA2977620C OPTICAL RECEPTION DEVICE AND OPTICAL RECEPTION METHOD 未知
公开(公告)号：CA2977620C
公开(公告)日：2020-04-14
申请号：CA2977620
申请日：2016-10-04
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAZAKI ETSUSHI , TAKAMUKU TOMOHIRO , YOSHIDA YUKI , YOSHIDA MITSUTERU , SHIBAHARA KOKI , HORIKOSHI KENGO , KISAKA YOSHIAKI
IPC分类号： H04B10/079 , G01M11/02 , H04B3/06 , H04B10/2513
摘要： In the present invention, a Fourier transform unit (11) performs Fourier transform on a filter coefficient output from an adaptive equalization unit (6) that is constituted by a finite impulse response filter of N taps (N is an integer of 2 or more) in a time direction. An eigenvalue sum calculation unit (15) integrates the result of differentiating the Fourier-transformed filter coefficient by a frequency with a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and then calculates the sum of two eigenvalues of the matrix. A proportionality coefficient calculation unit (14) calculates a proportionality coefficient relative to the frequency from the sum of the two eigenvalues.

10. 发明专利

CA2983578C DATA PHASE TRACKING DEVICE, DATA PHASE TRACKING METHOD AND COMMUNICATION DEVICE 未知
公开(公告)号：CA2983578C
公开(公告)日：2019-07-16
申请号：CA2983578
申请日：2017-01-16
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： ONUMA YASUHARU , TACHIBANA MASAHIRO , YAMAZAKI ETSUSHI , TAKEI KAZUHITO , YOSHIDA YUKI , IKEDA MASAYUKI , KISAKA YOSHIAKI , TOMIZAWA MASAHITO
IPC分类号： H04L7/00 , H03H17/02 , H03H17/06
摘要： An FIR filter (7) convolutes sampled data obtained by sampling a reception signal with tap coefficients. A phase difference detector (8) detects a phase difference between a synchronization timing of a signal waveform estimated from an output signal of the FIR filter (7) and a sampling timing of the output signal. A tap coefficient adjuster (9) adjusts the tap coefficients so as to reduce the phase difference detected by the phase difference detector (8) and causes the sampling timing of the output signal of the FIR filter (7) to track the synchronization timing.

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