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1. 发明申请

US20200252136A1 MODE COUPLING RECEIVER FOR QUANTUM COMMUNICATIONS AND QUANTUM COMMUNICATION SYSTEM COMPRISING SAID RECEIVER 审中-公开
公开(公告)号：US20200252136A1
公开(公告)日：2020-08-06
申请号：US16648935
申请日：2018-09-14
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew LORD
IPC分类号： H04B10/70 , H04L9/08 , B82Y10/00 , G01J1/44
摘要： An optical receiver including a mode-coupling receiver; in which the mode-coupling receiver includes a plurality of inputs; in which the mode-coupling receiver is configured to detect receipt of a single-photon signal comprising a stream of single photons on each of the plurality of inputs.

2. 发明申请

US20160057515A1 SIGNAL ROUTING 审中-公开
标题翻译：信号路由
公开(公告)号：US20160057515A1
公开(公告)日：2016-02-25
申请号：US14780959
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
CPC分类号： H04Q11/0005 , H04J14/0204 , H04J14/0205 , H04J14/0212 , H04J14/0217 , H04J14/0219 , H04J14/026 , H04Q11/0062 , H04Q2011/0015 , H04Q2011/0052
摘要： An upgradable optical route for tis use in an optical switching network is disclosed. In an initial configuration, the optical router contains wavelength selective switches configured to switch optical signals having WDM wavelengths positioned in a grid having exactly 100 GHz (about 0.8 nm) spacing in optical frequency, aka fixed grid. The interface ports and optical backplane within the optical switch contain an optical splitter and optical coupler and additionally space for a second selective switch. At a later point in time, a second wavelength selective switch can be added to provide additional capabilities such as switching wavelengths positioned in at flexible grid.
摘要翻译：公开了一种用于光交换网络中的可升级光路由。在初始配置中，光路由器包含波长选择开关，其被配置为切换具有定位在光频中具有正好100GHz（约0.8nm）间隔的网格中的WDM波长的光信号，也称为固定网格。光开关内的接口端口和光背板包含光分路器和光耦合器，另外用于第二选择开关。在稍后的时间点上，可以添加第二波长选择开关以提供额外的能力，例如位于柔性网格中的开关波长。

3. 发明申请

US20160057513A1 OPTICAL SWITCH 有权
标题翻译：光开关
公开(公告)号：US20160057513A1
公开(公告)日：2016-02-25
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.
摘要翻译：公开了一种光学开关，其适用于每个方向具有F> 1个光纤的光网络节点的分插，所述F光纤一起携带包括多达N个独立波长信道的光信号。该交换机包括具有F个输入端口和N个输出端口的光交叉连接（OXC）。 F光分路器连接到OXC，光分路器的输入和输出端口定义了OXC的端口。 OXC可控制，以将到达任何F开关输入端口的光信号切换到任何F分光器的输入端口，使得每个开关输入端口切换到具有至少与分配器输出端口在交换机输入端口接收的独立波长信道的数量。还公开了一种用于分离光信号的方法。

4. 发明申请

US20150326955A1 OPTICAL SIGNAL ROUTING 审中-公开
标题翻译：光信号路由
公开(公告)号：US20150326955A1
公开(公告)日：2015-11-12
申请号：US14409745
申请日：2013-05-10
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew LORD , Richard Andrew JENSEN
IPC分类号： H04Q11/00 , H04J14/02
CPC分类号： H04J14/0204 , H04J14/02 , H04J14/0205 , H04J14/0212 , H04J14/0217 , H04J14/0219 , H04J14/026 , H04Q11/0005 , H04Q2011/0015 , H04Q2011/0016 , H04Q2011/0052
摘要： An upgradable optical router for use in an optical switching network. In an initial configuration, the optical router includes wavelength selective switches configured to switch optical signals having WDM wavelengths positioned in a grid having exactly 100 GHz (about 0.8 nm) spacing in optical frequency, aka fixed grid. The interface ports within the optical switch include an optical splitter and optical coupler and additionally space for a second selective switch. At a later point in time, a second wavelength selective switch can be added to provide additional capabilities such as switching wavelengths positioned in a flexible grid.
摘要翻译：用于光交换网络的可升级光路由器。在初始配置中，光路由器包括波长选择开关，其被配置为切换光学信号，所述光信号具有定位在光频中具有正好100GHz（约0.8nm）间隔的网格中的WDM波长，即固定网格。光开关内的接口端口包括光分路器和光耦合器，另外用于第二选择开关。在稍后的时间点上，可以添加第二波长选择开关以提供额外的能力，例如位于灵活网格中的开关波长。

5. 发明申请

US20220166611A1 IMPROVEMENTS TO QKD NETWORK ARCHITECTURES 有权
公开(公告)号：US20220166611A1
公开(公告)日：2022-05-26
申请号：US17593683
申请日：2020-03-11
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew LORD
IPC分类号： H04L9/08 , H04B10/70 , H04B10/25
摘要： A system of transmitting optical pulses from a transmitter to first and second receivers for the purposes of quantum key distribution is disclosed. The system can include a transmitter configured to transmit a plurality of optical pulses; first and second receivers configured to receive some or all of the plurality of optical pulses; a guide for guiding the plurality of optical pulses, the guide having first and second output ports, the first output port being in optical communication with the first receiver and the second output port being in optical communication with the second receiver, the guide being configured to output a proportion of the optical pulses at the first output port and a proportion of the optical pulses at the second output port, modification means for modifying the guide so as to change the proportion of the optical pulses output at the first output port.

6. 发明申请

US20180115384A1 OPTICAL NETWORK DESIGN AND ROUTING 审中-公开
公开(公告)号：US20180115384A1
公开(公告)日：2018-04-26
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
CPC分类号： H04J14/0267 , H04J14/0257 , H04J14/0278
摘要： A method of allocating spectrum to a signal in a wavelength division multiplex network including comprising a plurality of nodes, wherein the spectrum comprises a grid divided into a plurality of slots, including comprising 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.

7. 发明申请

US20230059630A1 AN IMPROVED QKD METHOD 有权
公开(公告)号：US20230059630A1
公开(公告)日：2023-02-23
申请号：US17759683
申请日：2021-01-14
申请人： BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人： Andrew LORD
IPC分类号： H04L9/08 , H04L9/40 , H04B10/70
摘要： There is herein provided a method of performing Quantum Key Distribution, the method comprising, transmitting, in a first basis state, a first photon from a quantum transmitter to a quantum receiver; transmitting, in a second basis state, a second photon from the quantum transmitter to the quantum receiver, the second basis state being non-orthogonal to the first basis state and the transmitter and receiver being optically connected by both a first optical channel and a second optical channel, wherein the step of transmitting the first photon from the quantum transmitter to the quantum receiver in the first basis state comprises: transmitting the first photon from the quantum transmitter to the quantum receiver along either the first optical channel or the second optical channel, wherein the step of transmitting the second photon from the quantum transmitter to the quantum receiver in the second basis state comprises: transmitting a first portion of the probability distribution of the second photon from the transmitter to the receiver along the first optical channel; and transmitting a second portion of the probability distribution of the second photon from the transmitter to the receiver along the second optical channel.

8. 发明申请

US20160241353A1 OPTICAL DATA TRANSMISSION METHOD AND APPARATUS 有权
标题翻译：光学数据传输方法和设备
公开(公告)号：US20160241353A1
公开(公告)日：2016-08-18
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： 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.
摘要翻译：用于光纤网络的路由和波长分配方法包括：（i）识别网络中每个节点对之间的路径，（ii）识别所选节点对的所识别路径的频谱范围内的频谱资源块，（iii）基于所述一个或多个块中的每个中的每一个中的波长信道的数量的比率与所述频谱中的每个波长信道的总数的对数来计算所选择的节点对的所识别的路径的频谱熵值（iv）对于网络中每个其他节点对之间的每个路径迭代（ii）和（iii），直到已经计算了所有节点对之间的所有路径的频谱熵值，（v）对所有节点对之间的所有路径的频谱熵值求和，基于节点对之间的路径获得关于网络配置的网络频谱熵值，以及（vi）从网络频谱e ntropy值是否通过网络承载需求的信号是否与任何其他信号分离，其频谱间隙足以将需求的变化适应到预期的水平。

9. 发明申请

US20160057514A1 OPTICAL SWITCH 有权
标题翻译：光开关
公开(公告)号：US20160057514A1
公开(公告)日：2016-02-25
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。

10. 发明申请

US20220376905A1 COMBINING QKD AND CLASSICAL COMMUNICATION 有权
公开(公告)号：US20220376905A1
公开(公告)日：2022-11-24
申请号：US17753772
申请日：2020-08-18
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 communication between a client pair, the client pair including an upstream client and a downstream client, the method being performed over a first optical fiber in an optical fiber pair and including: transmitting a downstream DWDM signal over the first optical fiber, wherein the downstream DWDM signal has a first frequency and contains first data originating from the upstream client, transmitting an upstream DWDM signal over the first optical fiber, wherein the upstream DWDM signal has a second frequency and contains second data originating from the downstream client, wherein the first frequency is different to the second frequency, and performing Quantum Key Distribution over the second optical fiber of the optical fiber pair.

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