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1. 发明授权

US09654248B2 Optical data transmission method and apparatus 有权
公开(公告)号：US09654248B2
公开(公告)日：2017-05-16
申请号：US15028530
申请日：2014-10-10
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Paul Daniel Wright , Andrew Lord , Michael Charles Parker
IPC分类号： H04B10/00 , H04J14/02
CPC分类号： H04J14/0267 , H04J14/0256 , H04J14/0257 , H04J14/026
摘要： A routing and wavelength assignment method for use in an optical fiber network includes (i) identifying a path between each node pair in the network, (ii) identifying a block of spectral resource within the spectrum band of the identified path of a selected node pair, (iii) calculating a spectrum entropy value of the identified path of the selected node pair based on a logarithm of the ratio of the number of wavelength channels in each of the one or more blocks, to the total number of wavelength channels across the spectrum band, (iv) iterating (ii) and (iii) in respect of each of the paths between each other node pair in the network, until a spectrum entropy value of all the paths between all the node pairs has been calculated, (v) summing the spectrum entropy value of all of the paths between all of the node pairs to obtain a network spectrum entropy value in respect of a network configuration based on the paths between the node pairs, and (vi) determining from the network spectrum entropy value whether a signal carrying a demand through the network is separated from any other signals by a spectral gap sufficient to accommodate a change in the demand to an expected level.

2. 发明授权

US09560429B2 Optical switch 有权
标题翻译：光开关
公开(公告)号：US09560429B2
公开(公告)日：2017-01-31
申请号：US14780948
申请日：2014-03-12
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew Lord
IPC分类号： H04Q11/00 , H04J14/02
CPC分类号： H04Q11/0005 , H04J14/0204 , H04J14/0205 , H04J14/0217 , H04J14/0219 , H04Q2011/0015 , H04Q2011/0058
摘要： An optical switch suitable for use in a ROADM of an optical network node having one or more optical fiber per direction, the fibers together carrying optical signals comprising up to N independent wavelength channels, is disclosed. The switch includes an Optical Cross-Connect (OXC) having F1 input ports and F2 output ports. At least one optical splitter, at least one optical combiner and at least two wavelength blockers are separately connected to the OXC, the input and output parts thereof defining ports of the OXC. The OXC is controllable to switch optical signals arriving at any of the F1 switch input ports to any of the F2 switch output ports via one or more of the optical splitters, wavelength blockers and/or optical combiners. A method for switching optical signals is also disclosed.
摘要翻译：公开了一种适用于每个方向具有一个或多个光纤的光网络节点的ROADM的光开关，所述光纤一起承载包括多达N个独立波长信道的光信号。交换机包括具有F1输入端口和F2输出端口的光交叉连接（OXC）。至少一个光分路器，至少一个光合成器和至少两个波长阻挡器分别连接到OXC，其输入和输出部分限定OXC的端口。 OXC可控制，以通过一个或多个光分路器，波长阻挡器和/或光学组合器将到达任何F1开关输入端口的光信号切换到任何F2开关输出端口。还公开了一种用于切换光信号的方法。

3. 发明授权

US11316593B2 Optical DWDM data and QKD transmission system 有权
公开(公告)号：US11316593B2
公开(公告)日：2022-04-26
申请号：US15733354
申请日：2018-12-13
申请人： British Telecommunications Public Limited Company
发明人： Andrew Lord
IPC分类号： H04B10/70 , H04B10/50 , H04B10/66 , H04J14/02 , H04L9/08 , H04B10/297
摘要： An optical data transmission system and method for, at an optical transmitter, converting to a second wavelength, an optical data signal at a first wavelength; transmitting at the second wavelength, the optical data signal to an optical receiver over an optical path; and transmitting at the first wavelength, to the receiver over the path a single-photon signal comprising a stream of single photons. The optical path is configured to carry optical signals at different wavelengths and the optical path attenuates signals at the first wavelength less than the optical path attenuates signals at the second wavelength. The optical data transmission system and method for, at the receiver, receiving the single-photon signal at the first wavelength and receiving the optical data signal at the second wavelength; and converting the optical data signal to the first wavelength for detection.

4. 发明授权

US09693123B2 Optical switch 有权
公开(公告)号：US09693123B2
公开(公告)日：2017-06-27
申请号：US14780932
申请日：2014-03-12
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew Lord
IPC分类号： H04Q11/00 , H04J14/02
CPC分类号： H04Q11/0005 , H04J14/0204 , H04J14/0205 , H04J14/0217 , H04J14/0219 , H04Q2011/0015 , H04Q2011/0058
摘要： An optical switch suitable for use in an add/drop of an optical network node having F>1 optical fiber per direction, the F fibers together carrying optical signals comprising up to N independent wavelength channels, is disclosed. The switch includes an Optical Cross-Connect (OXC) having F input ports and N output ports. F optical splitters are connected to the OXC, the input and output ports of the optical splitters defining ports of the OXC. The OXC is controllable to switch optical signals arriving at any of the F switch input ports to the input port of any of the F optical splitters such that each switch input port is switched to an optical splitter having at least as many splitter output ports as the number of independent wavelength channels received at the switch input port. A method for splitting optical signals is also disclosed.

5. 发明申请

US20220294618A1 IMPROVEMENTS TO QKD METHODS 有权
公开(公告)号：US20220294618A1
公开(公告)日：2022-09-15
申请号：US17633564
申请日：2020-07-29
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew Lord
IPC分类号： H04L9/08
摘要： There is herein disclosed a method of performing Quantum Key Distribution for generating a shared secret key, the method including, at a first node, preparing or measuring a plurality of non-orthogonal quantum states, each of the plurality of non-orthogonal quantum states being prepared or measured using a respective one of a first set of basis states, and, at a second node, preparing or measuring the plurality of non-orthogonal quantum states each, of the plurality of non-orthogonal quantum states being prepared or measured using a respective one of a second set of basis states, and, at a third node, obtaining an indication of the first set of basis states from the first node and performing a key agreement stage with a fourth node to agree the shared secret key, the key agreement stage involving the first and second sets of basis states.

6. 发明申请

US20160072608A1 OPTICAL DATA TRANSMISSION 有权
标题翻译：光数据传输
公开(公告)号：US20160072608A1
公开(公告)日：2016-03-10
申请号：US14786399
申请日：2014-04-24
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Paul Daniel Wright , Andrew Lord , Michael Charles Parker
IPC分类号： H04J14/02 , H04L12/733 , H04Q11/00
CPC分类号： H04J14/0241 , H04J14/0213 , H04L45/122 , H04Q11/0066 , H04Q2011/0016 , H04Q2011/0086
摘要： A routing and wavelength assignment method for use in an optical fiber system, comprising; (i) identifying a plurality of paths between a source node and a destination node, (ii) selecting one of the plurality of identified paths, (iii) defining within the spectrum band of the selected path one or more blocks of spectral resource, in which each block comprises either: one or more unused wavelength channels, or one or more wavelength channels having the same spectral width, (iv) obtaining an entropy value of the selected path defining the spectrum fragmentation across its spectrum band, based on a logarithm of the ratio of the number of wavelength channels in each of the one or more blocks, to the total number of wavelength channels across the spectrum band, (v) iterating (ii) to (v) until the entropy value of each of the plurality of identified paths has been determined, and (vi) choosing from the plurality of identified paths a path having the lowest entropy value.
摘要翻译：一种用于光纤系统的路由和波长分配方法，包括：（i）识别源节点和目的地节点之间的多个路径，（ii）选择所述多个识别的路径之一，（iii）在选定路径的频谱带内定义一个或多个频谱资源块，在每个块包括：一个或多个未使用的波长信道，或具有相同光谱宽度的一个或多个波长信道，（iv）基于所述光谱带的对数，获得定义其频谱带上的频谱分段的所选路径的熵值一个或多个块中的每一个中的波长信道的数量的比率与跨越频谱带的波长信道的总数的比率，（v）迭代（ii）至（v）直到多个已经确定了确定的路径，并且（vi）从多个识别的路径中选择具有最低熵值的路径。

7. 发明授权

US10574381B2 Optical network design and routing 有权
公开(公告)号：US10574381B2
公开(公告)日：2020-02-25
申请号：US15562859
申请日：2016-03-29
申请人： British Telecommunications Public Limited Company
发明人： Paul Wright , Andrew Lord , Michael Parker
IPC分类号： H04J14/02
摘要： A method of allocating spectrum to a signal in a wavelength division multiplex network including a plurality of nodes, wherein the spectrum comprises a grid divided into a plurality of slots, including allocating to the signal a slot immediately adjacent to a second slot occupied by a second signal, wherein the signal and the second signal are both addressed to the same destination node, and wherein the slots allocated to the signal and the second signal form a spectrum block.

8. 发明授权

US09860012B2 Optical data transmission 有权
公开(公告)号：US09860012B2
公开(公告)日：2018-01-02
申请号：US14786399
申请日：2014-04-24
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Paul Daniel Wright , Andrew Lord , Michael Charles Parker
IPC分类号： H04J14/02 , H04L12/733 , H04Q11/00
CPC分类号： H04J14/0241 , H04J14/0213 , H04L45/122 , H04Q11/0066 , H04Q2011/0016 , H04Q2011/0086
摘要： A routing and wavelength assignment method for use in an optical fiber system, comprising: (i) identifying a plurality of paths between a source node and a destination node, (ii) selecting one of the plurality of identified paths, (iii) defining within the spectrum band of the selected path one or more blocks of spectral resource, in which each block comprises either: one or more unused wavelength channels, or one or more wavelength channels having the same spectral width, (iv) obtaining an entropy value of the selected path defining the spectrum fragmentation across its spectrum band, based on a logarithm of the ratio of the number of wavelength channels in each of the one or more blocks, to the total number of wavelength channels across the spectrum band, (v) iterating (ii) to (v) until the entropy value of each of the plurality of identified paths has been determined, and (vi) choosing from the plurality of identified paths a path having the lowest entropy value.

9. 发明授权

US11165570B2 Quantum key distribution in optical communications network 有权
公开(公告)号：US11165570B2
公开(公告)日：2021-11-02
申请号：US16494564
申请日：2018-03-09
申请人： British Telecommunications Public Limited Company
发明人： Neil Parkin , Andrew Lord
IPC分类号： H04L9/08 , H04J14/08 , H04B10/85 , H04Q11/00
摘要： A method for operating a communications network node, the node including a first amplified optical section, a second non-optical section, and an optical bypass section the method including receiving at the node, a first optical channel at a first wavelength and a second optical channel at a second wavelength; directing the first optical channel to the first amplified optical section; directing the second optical channel to the second non-optical section during a first time period; and directing the second optical channel to the optical bypass section during a second time period.

10. 发明申请

US20210126778A1 QUANTUM KEY DISTRIBUTION IN OPTICAL COMMUNICATIONS NETWORK 有权
公开(公告)号：US20210126778A1
公开(公告)日：2021-04-29
申请号：US16494564
申请日：2018-03-09
申请人： British Telecommunications Public Limited Company
发明人： Neil Parkin , Andrew Lord
IPC分类号： H04L9/08 , H04Q11/00 , H04B10/85
摘要： A method for operating a communications network node, the node including a first amplified optical section, a second non-optical section, and an optical bypass section the method including receiving at the node, a first optical channel at a first wavelength and a second optical channel at a second wavelength; directing the first optical channel to the first amplified optical section; directing the second optical channel to the second non-optical section during a first time period; and directing the second optical channel to the optical bypass section during a second time period.

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