公开(公告)号：EP2106051A4

公开(公告)日：2011-06-22

申请号：EP08703294

申请日：2008-01-16

申请人： NIPPON TELEGRAPH & TELEPHONE ,  NTT ELECTRONICS CORP

发明人： KISAKA YOSHIAKI ,  OHARA TAKUYA ,  AISAWA SHIGEKI ,  MIYAMOTO YUTAKA ,  TAKEI KAZUHITO ,  ENDOH YASUYUKI ,  MIURA KATSUYOSHI ,  NIKAIDO TADANOBU ,  TOMIZAWA MASAHITO

IPC分类号： H04J3/00 ,  H04L1/00 ,  H04L29/08

CPC分类号： H04J3/1664 ,  H04J3/07 ,  H04J3/14 ,  H04J2203/0085 ,  H04J2203/0089

摘要： A digital transmission system having at least a client device and a transmission device and rate-adjusting a client signal transmitted from the client device to the transmission device as necessary, to accommodate/multiplex the signal in a frame, is provided. The transmission device has a rate adjusting unit and a framer processing unit. The rate adjusting unit encapsulates the client signal using a predetermined frame structure, and inserts an idle pattern, as necessary, to perform rate adjustment to a bit rate that can be accommodated in the frame. The framer processing unit accommodates/multiplexes the signal into the frame after the rate adjustment. The digital transmission system accommodates, or accommodates and multiplexes, a bit string of the client signal directly in a payload portion, accommodates, or accommodates and multiplexes, the bit string in the payload portion after subjecting it to a reversible digital signal processing.

摘要翻译： 提供一种数字传输系统，其至少具有客户端设备和传输设备，并且根据需要对从客户端设备传输到传输设备的客户端信号进行速率调整，以适应/复用帧中的信号。 发送装置具有速率调整单元和成帧器处理单元。 速率调整单元使用预定的帧结构来封装客户端信号，并且根据需要插入空闲模式，以对可以容纳在帧中的比特率执行速率调整。 成帧器处理单元在速率调整之后将信号容纳/复用到帧中。 数字传输系统在经过可逆数字信号处理之后，直接在有效载荷部分中容纳或容纳和复用客户端信号的位串，容纳或复用有效负载部分中的位串。

公开(公告)号：EP2348654A4

公开(公告)日：2012-07-11

申请号：EP09825930

申请日：2009-11-13

申请人： NIPPON TELEGRAPH & TELEPHONE ,  NTT ELECTRONICS CORP

发明人： AISAWA SHIGEKI ,  TOMIZAWA MASAHITO ,  MIYAMOTO YUTAKA ,  KISAKA YOSHIAKI ,  ENDO YASUYUKI ,  MIURA KATSUYOSHI ,  TAKEI KAZUHITO

IPC分类号： H04J3/00 ,  H04J3/07 ,  H04J3/16

CPC分类号： H04J3/1652 ,  H04J3/076 ,  H04J2203/0089

公开(公告)号：EP1953931A4

公开(公告)日：2012-03-07

申请号：EP06756401

申请日：2006-05-19

申请人： NTT ELECTRONICS CORP ,  NIPPON TELEGRAPH & TELEPHONE

发明人： YONEYAMA MIKIO ,  SAITOU FUMIAKI ,  ONO SHIGERU ,  TAKEUCHI YOSUKE ,  YONENAGA KAZUSHIGE ,  KUWAHARA SHOICHIRO ,  YOSHIDA EIJI ,  MIYAMOTO YUTAKA ,  KAWAKAMI HIROTO

IPC分类号： H04B10/516 ,  G02F1/01 ,  H04B10/07 ,  H04B10/54 ,  H04B10/548 ,  H04B10/58 ,  H04B10/61 ,  H04B10/67 ,  H04B10/69 ,  H04L27/22

CPC分类号： H04L27/2071 ,  G02F1/0327 ,  H04B10/677 ,  H04L27/223

公开(公告)号：EP1965528A4

公开(公告)日：2012-09-05

申请号：EP06835092

申请日：2006-12-21

申请人： NIPPON TELEGRAPH & TELEPHONE ,  NTT ELECTRONICS CORP

发明人： KISAKA YOSHIAKI ,  AISAWA SHIGEKI ,  MIYAMOTO YUTAKA ,  TOMIZAWA MASAHITO ,  ENDOH YASUYUKI ,  TAKEI KAZUHITO

IPC分类号： H04J3/00 ,  H04J3/07 ,  H04J3/16 ,  H04J14/00 ,  H04J14/02 ,  H04L12/28

CPC分类号： H04J3/1652 ,  H04J3/07 ,  H04J2203/0085

摘要： An optical transmission system for performing frequency synchronization even with a client signal with low frequency accuracy, and for transmitting thereof by accommodating/multiplexing without causing a bit slip. A new overhead is added to the entire client signal, and the signal including the new overhead being stuffed is transmitted in conjunction with a plurality of stuffing bits as an optical signal wherein a data storing bit for a negative stuffing, a stuffing information notification bit, and a stuff bits inserting bit for a positive stuffing in the payload are defined in plurality as stuffing bits for adjusting clock frequencies of the client signal in this new overhead.

公开(公告)号：EP2456097A4

公开(公告)日：2013-04-10

申请号：EP10799861

申请日：2010-07-14

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： ISHIHARA KOICHI ,  KOBAYASHI TAKAYUKI ,  KUDO RIICHI ,  TAKATORI YASUSHI ,  MATSUI MUNEHIRO ,  MIZOGUCHI MASATO ,  NAKAGAWA TADAO ,  YAMAZAKI ETSUSHI ,  SANO AKIHIDE ,  MIYAMOTO YUTAKA ,  YOSHIDA EIJI ,  YAMANAKA SHOGO

IPC分类号： H04B3/06 ,  H04B10/077 ,  H04B10/2513

CPC分类号： H04B10/0775 ,  H04B3/06 ,  H04B10/25133

公开(公告)号：EP2672318A4

公开(公告)日：2014-05-07

申请号：EP12736206

申请日：2012-01-20

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： ASOBE MASAKI ,  UMEKI TAKESHI ,  ENBUTSU KOUJI ,  TOKURA AKIO ,  MIYAMOTO YUTAKA ,  TAKARA HIDEHIKO ,  TAKENOUCHI HIROKAZU ,  TOMITA ISAO

IPC分类号： G02F1/39 ,  G02F1/37 ,  H01S3/23 ,  H04B10/291

CPC分类号： H01S3/06754 ,  G02F1/3532 ,  G02F1/3534 ,  G02F1/3536 ,  G02F1/3544 ,  G02F1/37 ,  G02F1/39 ,  G02F2001/392 ,  H01S3/0092 ,  H01S3/1083 ,  H01S3/2391

公开(公告)号：EP2166681A4

公开(公告)日：2014-01-01

申请号：EP08777897

申请日：2008-07-04

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： KOBAYASHI TAKAYUKI ,  SANO AKIHIDE ,  MIYAMOTO YUTAKA

IPC分类号： H04B10/2507 ,  G02F1/01 ,  H04B10/2513 ,  H04B10/2543 ,  H04B10/40 ,  H04B10/50 ,  H04B10/516 ,  H04B10/548 ,  H04B10/572 ,  H04B10/58 ,  H04B10/60 ,  H04B10/61 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04B10/5053 ,  G02F1/0327 ,  G02F1/225 ,  H04B10/548 ,  H04B10/5561

摘要： An optical modulator and an optical transmission system convert continuous light of a multiple wavelength light source, which generates the continuous light with a fixed and complete phase but different frequencies, to a modulator driving signal so as to generate a light subcarrier with each frequency at the center and modulate the continuous light to the light subcarrier by using the modulator driving signal. In the case where an optical modulation is carried out by an optical IQ-modulator, transmitting data, for example, is converted to two parallel data A(t) and B(t), an I phase signal, in which the data A(t)+B(t) are modulated with a clock signal with a frequency É, and a Q phase signal, in which the data A(t)-B(t) are modulated with a clock signal with a À/2 phase shifted, are generated, and the I phase signal and the Q phase signal are applied to electrodes of the optical IQ-modulator, respectively.

公开(公告)号：EP1760521A4

公开(公告)日：2013-12-04

申请号：EP05750960

申请日：2005-06-17

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： MASUDA HIROJI ,  SATO KENJI ,  MIYAMOTO YUTAKA

IPC分类号： G02F1/35 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/16 ,  H01S3/30 ,  H04B10/29 ,  H04B10/294

CPC分类号： H01S3/302 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/1608 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/294

公开(公告)号：EP2051420A4

公开(公告)日：2009-11-04

申请号：EP07807741

申请日：2007-09-21

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： KISAKA YOSHIAKI ,  AISAWA SHIGEKI ,  TAKAHASHI TETSUO ,  OHARA TAKUYA ,  KOGA MASAFUMI ,  TOMIZAWA MASAHITO ,  MIYAMOTO YUTAKA

IPC分类号： H04J3/00 ,  H04J3/22 ,  H04J14/08 ,  H04L12/28

CPC分类号： H04J3/1664 ,  H04J3/07 ,  H04L25/14

公开(公告)号：EP2584720A4

公开(公告)日：2013-11-27

申请号：EP11795834

申请日：2011-06-17

申请人： NIPPON TELEGRAPH & TELEPHONE

发明人： NAKAGAWA TADAO ,  MATSUI MUNEHIRO ,  ISHIHARA KOICHI ,  KUDO RIICHI ,  KOBAYASHI TAKAYUKI ,  YAMAZAKI ETSUSHI ,  SANO AKIHIDE ,  YOSHIDA EIJI ,  MIZOGUCHI MASATO ,  MIYAMOTO YUTAKA ,  TAKATORI YASUSHI

IPC分类号： H04B17/00 ,  H04B7/10 ,  H04B10/00 ,  H04B10/61 ,  H04J11/00 ,  H04L27/00 ,  H04L27/14

CPC分类号： H04L27/14 ,  H04B7/10 ,  H04B10/611 ,  H04B10/6164 ,  H04B17/327 ,  H04L27/2659 ,  H04L2027/0026 ,  H04L2027/0032 ,  H04L2027/0046

摘要： Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N /2 of the frequency spectrum and a frequency band of positive frequency components from N /2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.