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公开(公告)号：US11711150B2
公开(公告)日：2023-07-25
申请号：US17437925
申请日：2020-03-06
IPC分类号： H04B10/272 , H04B10/572 , G02B6/287 , H04B10/50 , H04J14/02
CPC分类号： H04B10/572 , G02B6/287 , H04B10/272 , H04B10/506 , H04J14/0204
摘要： An object is to provide an optical communication system and an optical communication method that are capable of, when assigning wavelengths on a per-service basis and providing services on a per-area basis, preventing degradation of signal quality due to linear crosstalk and preventing an increase in cost and size. An optical communication system according to the present invention includes an optical splitter 300 connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N and M each being an integer of two or more, where wavelengths of optical signals to be received are limited for each group of optical receivers 106, by using a correlation between a fused extension length of at least one 2×2 fiber optical splitter directly connected to the first port, among the 2×2 fiber optical splitters, and wavelength output characteristics of the second port of the optical splitter 300.
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公开(公告)号：US12078589B2
公开(公告)日：2024-09-03
申请号：US17638122
申请日：2019-08-27
CPC分类号： G01N21/21 , G01N2021/1744 , G01N2021/1793
摘要： An objective of the present invention is to provide an optical measurement device capable of performing remote optical measurement. An optical measurement device may include a light source that generates irradiation light with a beam shape, a beam control unit configured to control an irradiation direction of the irradiation light L1, a condensing unit configured to condense returned light generated by irradiating a part of a measurement target with the irradiation light, and a detection unit configured to detect information regarding the measurement target included in the returned light condensed by the condensing unit. The beam control unit can control the irradiation direction of the irradiation light for measurement to any direction, and thus the condensing unit can efficiently receive the faint returned light from the measurement target.
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公开(公告)号：US11956009B2
公开(公告)日：2024-04-09
申请号：US17911238
申请日：2020-03-17
发明人： Atsuko Kawakita , Yasutaka Kimura , Kazutaka Hara
IPC分类号： H04B10/275 , H04B10/032
CPC分类号： H04B10/032 , H04B10/275
摘要： An object of the present invention is to provide an optical communication system and an optical communication method capable of achieving a long transmission distance with a passive element and obtaining redundancy of a ring topology.
The optical communication system according to the present invention is a PON system having a ring configuration, in which an unequal branch optical splitter having a left-right symmetrical configuration is disposed in a trunk fiber wired in a loop shape. An OLT and an ONU have a configuration in which two sets of Tx (transmitter) and Rx (receiver) are mounted. Two sets of Tx (transmitters) and Rx (receivers) in each of a plurality of ONUs are respectively connected to left and right symmetrical ports of one unequally branched light beam SP.-
公开(公告)号：US12068776B2
公开(公告)日：2024-08-20
申请号：US17910557
申请日：2020-03-12
发明人： Yasutaka Kimura , Kazutaka Hara , Atsuko Kawakita
IPC分类号： H04B10/073
CPC分类号： H04B10/073
摘要： In response to the above issue, an object of the present invention is to provide a diagnostic apparatus and a diagnostic method capable of accurately recognizing whether to use a long extension function at the time of relocation of an accommodation station of an OLT. The diagnostic apparatus according to an aspect of the present invention has an allowable line length list that is a relationship between a center wavelength and an allowable line distance that satisfies a selected spectrum width in an optical fiber used in an optical communication system, measures a center wavelength and a spectrum width of a spectrum for each ONU, matches the allowable line length list, and obtains an allowable line distance of each ONU.
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公开(公告)号：US11881893B2
公开(公告)日：2024-01-23
申请号：US17798295
申请日：2020-02-12
发明人： Kazutaka Hara , Yasutaka Kimura , Atsuko Kawakita
IPC分类号： H04J14/00 , H04B10/2507 , H04B10/25 , H04J14/02
CPC分类号： H04B10/25073 , H04B10/25891 , H04J14/0204 , H04J14/0252
摘要： An optical communication system according to the present invention cancels waveform distortion due to wavelength dispersion by extracting the spectrum of a transmitted optical signal and passing the optical signal to a fiber having a dispersion value opposite to a dispersion amount corresponding to a transmission distance received by the spectrum component and compensates for a transmission path loss due to the fiber having the opposite dispersion value using optical splitters having different split ratios. With this configuration, the present invention can compensate for waveform distortion due to wavelength dispersion by a simple method in an access network and achieve an increase in the reachable transmission distance of the farthest user or an increase in the number of connectable users.
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公开(公告)号：US11290189B2
公开(公告)日：2022-03-29
申请号：US17271222
申请日：2019-08-21
IPC分类号： H04J14/00 , H04B10/272 , G02B6/27 , H04L12/44
摘要： To provide an optical communication system and an optical communication method able to achieve a high reliable access network capable of long haul distance transmission considering the optical energy efficiency even if the user distribution is biased. An uneven branch optical splitter included in an optical communication system according to the present invention can output the optical intensities different for each output port by adjusting the branching configuration and the branching ratio. For example, a reach transmission distance of the farmost user can be extended or the number of connectible users can be increased by adjusting the branching configuration of the uneven branch optical splitter or the branching ratios such that the near minimum reception sensitivity is given for the ONU installed near the telecommunications carrier.
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公开(公告)号：US11996895B2
公开(公告)日：2024-05-28
申请号：US17798068
申请日：2020-02-12
发明人： Kazutaka Hara , Yasutaka Kimura , Atsuko Kawakita
CPC分类号： H04B10/614 , H04B10/25891
摘要： In order to solve the problems described above, an object of the present invention is to provide an optical communication system and a control method that automatically adjust a branching ratio of an optical splitter in accordance with a connection of a new ONU. An optical communication system according to the present invention causes an operation system or a DBA (Dynamic Bandwidth Allocation) function and a determining unit of a branching ratio of an optical splitter to cooperate with each other, adjusts the branching ratio so as to enable ranging with an active ONU, and takes into consideration an initial connection sequence through which an ONU is newly connected.
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公开(公告)号：US11863211B2
公开(公告)日：2024-01-02
申请号：US17908527
申请日：2020-03-04
发明人： Ryo Igarashi , Masamichi Fujiwara , Kazutaka Hara , Takuya Kanai , Yasutaka Kimura , Atsuko Kawakita
IPC分类号： H04B10/294 , H04J14/02 , H04B10/2575 , H04B10/278
CPC分类号： H04B10/25756 , H04B10/278 , H04B10/294 , H04J14/0202 , H04J14/0221
摘要： An optical communication system configured with a station-side apparatus and a plurality of subscriber-side apparatuses in a bus network topology includes an optical amplification unit installed on a station side, and a drop unit configured to branch an optical signal and excitation light, wherein the optical amplification unit includes an amplifier configured to amplify a downlink signal, and an excitation light output unit configured to output the excitation light for amplifying an uplink signal to a communication path, and the drop unit changes a branching ratio in accordance with a wavelength of the optical signal so that a transmission loss of the excitation light with respect to a trunk fiber is reduced.
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公开(公告)号：US11689311B2
公开(公告)日：2023-06-27
申请号：US17440410
申请日：2020-03-06
IPC分类号： H04J14/02 , G02B6/287 , H04B10/272
CPC分类号： H04J14/025 , G02B6/287 , H04B10/272
摘要： An object is to provide an optical communication system capable of controlling the output ratio by port and by wavelength for incident light of different wavelengths, a method of determining the split ratio of an uneven-split optical splitter for controlling the output ratio by port and by wavelength, and a transmission range determination method for the optical communication system. The split ratio determination method for an uneven-split optical splitter according to the present invention uses the melt-draw distance to adjust the split ratio of each fiber-optic splitter included in the uneven-split optical splitter such that the light output from the farthest ONUs among each of the ports connected under the ports B to M of the uneven-split optical splitter arrives with the minimum reception sensitivity at OLT receivers in a PON system.
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