公开(公告)号：US20180375607A1

公开(公告)日：2018-12-27

申请号：US15775265

申请日：2017-01-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kohki SHIBAHARA ,  Takayuki MIZUNO ,  Hiroto KAWAKAMI ,  Yutaka MIYAMOTO

IPC: H04J14/04 ,  H04B7/0413 ,  H04L25/03 ,  H04B10/50 ,  H04B10/69

Abstract: An optical transmission system includes an optical transmission apparatus and an optical reception apparatus. The optical transmission apparatus includes a conversion unit that converts multiple binary data sequences into data in a predetermined signal format; a coding unit that generates multiple pieces of coded data by performing predetermined coding on each of the multiple pieces of converted data; an optical signal generation unit that generates multiple optical signals by converting the multiple pieces of coded data into optical signals; and a mode multiplexer that converts the multiple optical signals into different modes, generates a mode-division multiplexed optical signal by mode-division multiplexing the optical signals, and transmits the generated mode-division multiplexed optical signal to the optical reception apparatus. The optical reception apparatus includes a mode demultiplexer that demultiplexes the mode-division multiplexed optical signal transmitted from the optical transmission apparatus into light in different modes; a photoelectric conversion unit that converts the light in the multiple different modes into electrical signals; an analog/digital conversion unit that converts the multiple electrical signals into coded data; and an MIMO equalization processing unit that performs MIMO equalization processing on the converted coded data.

公开(公告)号：US20160205451A1

公开(公告)日：2016-07-14

申请号：US15080282

申请日：2016-03-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazushige YONENAGA ,  Hidehiko TAKARA ,  Masahiko JINNO ,  Kohki SHIBAHARA ,  Takashi GOH

IPC: H04Q11/00 ,  H04J14/02 ,  H04B10/572 ,  H04B10/40 ,  H04B10/516

CPC classification number: H04Q11/0003 ,  H04B10/40 ,  H04B10/506 ,  H04B10/516 ,  H04B10/572 ,  H04J14/02 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0224 ,  H04J14/026 ,  H04L27/2697 ,  H04Q11/0005 ,  H04Q2011/0035

Abstract: There is provided a multi-flow optical transceiver that includes (a) a plurality of wavelength-tunable light sources, (b) a plurality of optical modulation units which modulates light with an input signal, (c) an optical multiplexing/demultiplexing switch which couples light from at least one of the wavelength-tunable light sources to at least one of the optical modulation units with any power, (d) an optical coupling unit which couples a plurality of lights, modulated by a plurality of the optical modulation units, to at least one waveguide, (e) at least one multiple carrier generating unit which generates multiple carries, arranged at equal frequency intervals, from light of the wavelength-tunable light source, and (f) a wavelength separation unit which branches the multiple carriers from the multiple carrier generating unit for each wavelength.

Abstract translation: 提供了一种多流量光收发器，其包括（a）多个波长可调光源，（b）多个光调制单元，其用输入信号调制光;（c）光复用/解复用开关， 将光从至少一个波长可调光源耦合到具有任何功率的至少一个光调制单元;（d）耦合由多个光调制单元调制的多个光的光耦合单元， 至少一个波导，（e）至少一个多载波产生单元，其从所述波长可调光源的光产生以相等的频率间隔布置的多个载波，以及（f）分支所述多个载波的波长分离单元 对于每个波长从多载波产生单元。

公开(公告)号：US20210218477A1

公开(公告)日：2021-07-15

申请号：US17197754

申请日：2021-03-10

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kohki SHIBAHARA ,  Takayuki MIZUNO ,  Akira ISODA ,  Yutaka MIYAMOTO

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

Abstract: 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

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

Abstract: 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

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kohki SHIBAHARA ,  Takayuki MIZUNO ,  Akira ISODA ,  Yutaka MIYAMOTO

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

Abstract: 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：US20150333838A1

公开(公告)日：2015-11-19

申请号：US14758941

申请日：2014-01-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kengo HORIKOSHI ,  Kohki SHIBAHARA ,  Etsushi YAMAZAKI ,  Mitsuteru YOSHIDA ,  Koichi ISHIHARA ,  Takayuki KOBAYASHI ,  Yoshiaki KISAKA ,  Takuya OHARA ,  Masahito TOMIZAWA ,  Tomoyoshi KATAOKA

IPC: H04B10/61 ,  H04L27/38 ,  H04L7/00 ,  H04L27/06

CPC classification number: H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

Abstract: An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.

Abstract translation: 光接收装置接收通过相位调制或正交幅度调制进行了调制的光信号，使用相干检测将接收的光信号转换为电信号，并对转换的接收信号进行相位补偿，并包括：载波 估计从接收信号获得的接收符号串中的载波相位误差的相位估计单元; 增益调整单元，对输入到所述载波相位调整单元的符号进行增益调整; 通过对来自载波相位估计单元的输出进行统计处理，检测导致相位滑动的一般噪声并减少相位滑动的相位滑移减小单元; 以及相位补偿电路，其使用来自载波相位估计单元的输出来补偿接收信号中包含的载波相位误差。