公开(公告)号：US20220294535A1

公开(公告)日：2022-09-15

申请号：US17637691

申请日：2019-08-26

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takeshi Kakizaki ,  Fukutaro Hamaoka ,  Masanori NAKAMURA ,  Takeo Sasai

IPC分类号： H04B10/54 ,  H04L27/26

摘要： A communication device includes an amplitude conversion unit configured to generate a symbol sequence according to a bit sequence, a distribution matching unit configured to add redundant bits to the symbol sequence through probabilistic amplitude shaping (PAS) coding, an insertion unit configured to insert a pilot symbol into the symbol sequence to which the redundant bits have been added and transmit the symbol sequence into which the pilot symbol has been inserted to a transmission path, and a control unit configured to acquire information on the transmission path and change, according to the information on the transmission path, allocation of the redundancy of the PAS coding and the redundancy of the pilot symbol in a range of redundancy that is able to be allocated depending on a predetermined throughput.

公开(公告)号：US11901953B2

公开(公告)日：2024-02-13

申请号：US17915002

申请日：2020-03-31

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takeo Sasai ,  Masanori Nakamura ,  Asuka Matsushita ,  Yoshiaki Kisaka

IPC分类号： H04B10/06 ,  H04B10/61 ,  H04B10/58

CPC分类号： H04B10/6162 ,  H04B10/58

摘要： An optical transmission system, in which an optical transmission apparatus and an optical reception apparatus are provided, includes a coefficient determination unit configured to optimize, based on a reception signal received by the optical reception apparatus, a coefficient to be used to compensate for deterioration according to characteristics of each device configuring a transmission path between the optical transmission apparatus and the optical reception apparatus, and a device characteristic estimation unit configured to estimate the characteristics of each device by using the optimized coefficient.

公开(公告)号：US11728889B2

公开(公告)日：2023-08-15

申请号：US17782957

申请日：2019-12-16

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takeo Sasai ,  Fukutaro Hamaoka ,  Masanori Nakamura ,  Seiji Okamoto

IPC分类号： H04B10/2543 ,  H04B10/61

CPC分类号： H04B10/2543 ,  H04B10/6161

摘要： An optical reception device includes a coefficient update section which optimizes a dispersion coefficient used in compensation of wavelength dispersion of a received signal obtained by receiving an optical signal according to a coherent detection method and a phase rotation amount used in compensation of a nonlinear optical effect of the received signal, and a transmission characteristic estimation section which estimates a transmission characteristic of a transmission line by using the optimized dispersion coefficient and the optimized phase rotation amount.

公开(公告)号：US11799557B2

公开(公告)日：2023-10-24

申请号：US17637691

申请日：2019-08-26

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takeshi Kakizaki ,  Fukutaro Hamaoka ,  Masanori Nakamura ,  Takeo Sasai

IPC分类号： H04B10/54 ,  H04L27/26

CPC分类号： H04B10/541 ,  H04L27/2605 ,  H04L27/2613

摘要： A communication device includes an amplitude conversion unit configured to generate a symbol sequence according to a bit sequence, a distribution matching unit configured to add redundant bits to the symbol sequence through probabilistic amplitude shaping (PAS) coding, an insertion unit configured to insert a pilot symbol into the symbol sequence to which the redundant bits have been added and transmit the symbol sequence into which the pilot symbol has been inserted to a transmission path, and a control unit configured to acquire information on the transmission path and change, according to the information on the transmission path, allocation of the redundancy of the PAS coding and the redundancy of the pilot symbol in a range of redundancy that is able to be allocated depending on a predetermined throughput.

公开(公告)号：US11716149B2

公开(公告)日：2023-08-01

申请号：US17435105

申请日：2020-03-02

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takeo Sasai ,  Fukutaro Hamaoka

IPC分类号： H04B10/06 ,  H04B10/61

CPC分类号： H04B10/6163

摘要： An optical reception device includes a nonlinear optical compensation section which performs compensation of wavelength dispersion of a received signal obtained by receiving an optical signal according to a coherent detection method and compensation of a nonlinear optical effect of the received signal N (N is an integer of at least 1) step(s), and a coefficient update section which updates a coefficient so as to optimize the coefficient used in each step of the nonlinear optical compensation section based on a signal having been subjected to the compensation by the nonlinear optical compensation section and a predetermined training signal.