-
公开(公告)号：US08682171B1
公开(公告)日：2014-03-25
申请号：US12485440
申请日：2009-06-16
IPC分类号： H04B10/11
CPC分类号： H04B10/11 , H04B10/0795 , H04B10/1123 , H04B10/1125 , H04J14/02 , H04Q11/0067 , H04Q2011/0026 , H04Q2011/0081
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path coupled to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括多个邻域链路，以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括：检测由雨和雾中的至少一个导致的接收信号故障的存在。 该方法进一步包括当接收到的信号故障由于下雨而在第一链路的RF信道中发送数据时，在接收到的信号失效是由于雾时，在第一链路的自由空间光信道中发送数据。
-
公开(公告)号：US07010227B1
公开(公告)日：2006-03-07
申请号：US10691949
申请日：2003-10-23
IPC分类号： H04J14/00
CPC分类号： H04B10/1125
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path couples to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links to corresponding users, an optical switch coupled to the plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure by monitoring channel losses in a first link the received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure sensed is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括到相应用户的多个邻居链路，耦合到多个邻居链路的光学交换机以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括通过监视第一链路中的信道损失来检测接收到的信号故障的存在，所述信号损失是由雨和雾中的至少一个导致的。 所述方法还包括当所感测到的接收到的信号故障是由于雨而在第一链路的RF信道中发送数据时发送数据在第一链路的自由空间光信道中，并且当所感测的接收信号故障是由于雾而发送的。
-
公开(公告)号：US6151373A
公开(公告)日：2000-11-21
申请号：US832544
申请日：1997-04-03
摘要： A receiver is provided in which a composite signal is split into two paths. In the first path, a desired signal channel is suppressed by a notch filter. The remaining channels in the composite signal are inverted. In the second path, the signal is delayed to match the delay imposed by the first path. The signal from the first path is recombined with the second path, which reduces the signal level of the undesired channels to the level of quantization noise. The desired signal can then be amplified using the full dynamic range of the amplifier circuitry. If desired, more than one channel may be received at a time. Further, if the two or more channels that are being received have different signal strengths, the digital filtering functions of the notch filter can be used to selectively weight the signals to equalize their strengths. In addition, channels of different bandwidths can be received.
摘要翻译： 提供了一种接收机，其中复合信号被分成两个路径。 在第一路径中，期望的信号通道被陷波滤波器抑制。 复合信号中的其余通道被反转。 在第二路径中，信号被延迟以匹配由第一路径施加的延迟。 来自第一路径的信号与第二路径重新组合，这将不需要的信道的信号电平降低到量化噪声的水平。 然后可以使用放大器电路的全部动态范围来放大所需的信号。 如果需要，一次可以接收多于一个信道。 此外，如果正在接收的两个或更多个信道具有不同的信号强度，则陷波滤波器的数字滤波功能可以用于选择性地对信号进行加权以均衡其强度。 另外，可以接收不同带宽的信道。
-
公开(公告)号：US07565081B1
公开(公告)日：2009-07-21
申请号：US11894928
申请日：2007-08-22
IPC分类号： H04J14/00
CPC分类号： H04B10/11 , H04B10/0795 , H04B10/1123 , H04B10/1125 , H04J14/02 , H04Q11/0067 , H04Q2011/0026 , H04Q2011/0081
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path coupled to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括多个邻域链路，以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括：检测由雨和雾中的至少一个导致的接收信号故障的存在。 该方法进一步包括当接收到的信号故障由于下雨而在第一链路的RF信道中发送数据时，在接收到的信号失效是由于雾时，在第一链路的自由空间光信道中发送数据。
-
公开(公告)号：US06788898B1
公开(公告)日：2004-09-07
申请号：US09641083
申请日：2000-08-17
IPC分类号： H04J1400
CPC分类号： H04B10/1125
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path couples to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links to corresponding users, an optical switch coupled to the plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure by monitoring channel losses in a first link, the received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure sensed is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括到相应用户的多个邻居链路，耦合到多个邻居链路的光学交换机以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括通过监视第一链路中的信道损耗来检测接收到的信号故障的存在，所述接收信号由雨和雾中的至少一个导致。 所述方法还包括当所感测到的接收到的信号故障是由于雨而在第一链路的RF信道中发送数据时发送数据在第一链路的自由空间光信道中，并且当所感测的接收信号故障是由于雾而发送的。
-
公开(公告)号：US6122084A
公开(公告)日：2000-09-19
申请号：US33236
申请日：1998-03-03
IPC分类号： H04B10/077 , H04B10/112 , H04B10/00 , H04B10/06
CPC分类号： H04B10/0775 , H04B10/1121 , H04B2210/075 , H04B2210/078
摘要： A free-space optical communications system and method in which a transmitter transmits a free-space optical communication beam to an optical receiver. The receiver includes an optical detector, an optical input level sensor and an optical attenuation device. The optical detector detects the optical communication beam, while the optical input level sensor senses an optical input level of the optical communication beam at the optical detector and outputs a control signal corresponding to the sensed optical input level. The optical attenuation device is responsive to the control signal by attenuating the optical input level of the optical communication beam to be less than a predetermined input level. The optical input level sensor includes a detector optical level sensor, a comparator circuit and a controller. The detector bias level sensor senses an optical level of the optical detector. The comparator circuit is coupled to the detector bias level sensor and compares the sensed optical level of the optical detector to predetermined threshold levels. The comparator circuit outputs a code signal relating a magnitude of the sensed optical level of the optical detector to the predetermined thresholds. The controller is responsive to the code signal by outputting the control signal.
摘要翻译： 一种自由空间光通信系统和方法，其中发射机将自由空间光通信波束发射到光接收机。 接收机包括光检测器，光输入电平传感器和光衰减器件。 光学检测器检测光通信光束，而光输入电平传感器感测光学检测器处的光通信光束的光输入电平，并输出对应于感测的光输入电平的控制信号。 光衰减装置通过将光通信光束的光输入电平衰减到小于预定输入电平来响应于控制信号。 光输入电平传感器包括检测器光学电平传感器，比较器电路和控制器。 检测器偏置电平传感器感测光学检测器的光学水平。 比较器电路耦合到检测器偏置电平传感器，并将感测到的光学检测器的光学水平与预定阈值电平进行比较。 比较器电路将与检测到的光检测器的光电平的大小相关联的代码信号输出到预定阈值。 控制器通过输出控制信号来响应于代码信号。
-
公开(公告)号：US07295777B1
公开(公告)日：2007-11-13
申请号：US11442924
申请日：2006-05-30
CPC分类号： H04J14/02 , H04B10/1125 , H04J14/0227 , H04J14/0246 , H04J14/025 , H04J14/0282 , H04J14/0283 , H04J14/0298 , H04Q11/0067 , H04Q2011/0016 , H04Q2011/003
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path couples to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links to corresponding users, an optical switch coupled to the plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure by monitoring channel losses in a first link, the received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure sensed is due to fog.
-
公开(公告)号：US06427038B1
公开(公告)日：2002-07-30
申请号：US09639635
申请日：2000-08-15
IPC分类号： G02B626
CPC分类号： G02B6/3588 , G02B6/29311 , G02B6/29395 , G02B6/3518 , G02B6/3546 , G02B6/356 , G02B6/3586 , G02B2006/12104
摘要： An optical switch includes an input optical fiber, an output optical fiber and a mirror that is either inclinable or rotatable or both and reflects a lightwave signal from the input optical fiber into the output optical fiber. The switch further includes a control circuit to sense a misalignment error and to adjust the mirror to correct the misalignment error. The misalignment error may be either an inclination misalignment error, a rotation misalignment error or both. In an alternative embodiment, an optical switch includes an input optical fiber that includes an input core and an input cladding, an output optical fiber that includes an output core and an output cladding, an input GRISM to insert a calibration signal into the input cladding and a mirror that is adjustable. The mirror reflects a lightwave signal from the input core into the output core and reflects the calibration signal from the input cladding into the output cladding. The optical switch further includes an output GRISM to extract the calibration signal from the output cladding and a control circuit to sense a misalignment error based on the extracted calibration signal. The misalignment error includes an inclination misalignment error or a rotation misalignment error or both. The control circuit includes circuitry to adjust the mirror to correct the misalignment error. In an alternative embodiment, an optical switch includes an input optical fiber, an output optical fiber and a rotatable mirror that has diffraction gratings etched thereon. The mirror reflects a lightwave signal from the input optical fiber into the output optical fiber. The optical switch further includes a control circuit to adjust a rotation angle of the mirror to select a wavelength that can be diffracted into the output optical fiber according to a spacing of the diffraction gratings.
摘要翻译： 光开关包括输入光纤，输出光纤和可倾斜或可旋转的两者的反射镜，并将来自输入光纤的光波信号反射到输出光纤中。 开关还包括用于感测不对准误差的控制电路，并且调整反射镜以校正不对准误差。 不对准误差可能是倾斜失准误差，旋转失准误差或两者。 在替代实施例中，光开关包括输入光纤，其包括输入芯和输入包层，包括输出芯和输出包层的输出光纤，输入GRISM以将校准信号插入到输入包层中，以及 一个可调的镜子。 反射镜将来自输入核心的光波信号反射到输出核心，并将来自输入包层的校准信号反射到输出包层中。 光开关还包括输出GRISM以从输出包层提取校准信号，以及控制电路，用于基于所提取的校准信号感测到未对准误差。 不对准误差包括倾斜失准误差或旋转失准误差或两者。 控制电路包括调整反射镜以校正不对准误差的电路。 在替代实施例中，光开关包括输入光纤，输出光纤和在其上刻蚀衍射光栅的可旋转镜。 反射镜将来自输入光纤的光波信号反射成输出光纤。 光开关还包括控制电路，用于调节反射镜的旋转角度，以根据衍射光栅的间隔选择可衍射成输出光纤的波长。
-
公开(公告)号：US07274877B1
公开(公告)日：2007-09-25
申请号：US11215903
申请日：2005-08-31
IPC分类号： H04B10/00
CPC分类号： H04B10/1125
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path couples to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links to corresponding users, an optical switch coupled to the plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure by monitoring channel losses in a first link, the received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure sensed is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括到相应用户的多个邻居链路，耦合到多个邻居链路的光学交换机以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括通过监视第一链路中的信道损耗来检测接收到的信号故障的存在，所述接收信号由雨和雾中的至少一个导致。 所述方法还包括当所感测到的接收到的信号故障是由于雨而在第一链路的RF信道中发送数据时发送数据在第一链路的自由空间光信道中，并且当所感测的接收信号故障是由于雾而发送的。
-
公开(公告)号：US07095957B1
公开(公告)日：2006-08-22
申请号：US10933134
申请日：2004-09-02
CPC分类号： H04B10/11 , H04B10/0795 , H04B10/1123 , H04B10/1125 , H04J14/02 , H04Q11/0067 , H04Q2011/0026 , H04Q2011/0081
摘要： A communication system includes a plurality of nodes and a plurality of point-to-point links that interconnect the plurality of nodes into a network. Each node includes an optical switch to controllably route a plurality of in-ports of the optical switch into a plurality of out-ports of the optical switch. Each point-to-point link includes a free space optical channel. A first free space optical channel couples to a first node through a receive path and through a transmit path. The receive path couples to a respective in-port of the optical switch of the first node, and the transmit path couples to a respective out-port of the optical switch of the first node. In an alternative embodiment, a communication hub includes a plurality of neighborhood links to corresponding users, an optical switch coupled to the plurality of neighborhood links, and a trunk coupled between the optical switch and a free space optical channel link to the network. A method of communicating in a network having plural links includes sensing the presence of a received signal failure by monitoring channel losses in a first link, the received signal failure resulting from at least one of rain and fog. The method further includes sending data in a free space optical channel of the first link when the received signal failure sensed is due to rain and sending the data in an RF channel of the first link when the received signal failure sensed is due to fog.
摘要翻译： 通信系统包括将多个节点互连到网络中的多个节点和多个点对点链路。 每个节点包括光开关，用于将光开关的多个入口可控地路由到光开关的多个输出端口中。 每个点对点链路包括自由空间光通道。 第一自由空间光信道通过接收路径并通过发送路径耦合到第一节点。 接收路径耦合到第一节点的光交换机的相应入口，并且发送路径耦合到第一节点的光开关的相应输出端口。 在替代实施例中，通信集线器包括到相应用户的多个邻居链路，耦合到多个邻居链路的光学交换机以及耦合在光学交换机和到网络的自由空间光信道链路之间的中继。 在具有多个链路的网络中进行通信的方法包括通过监视第一链路中的信道损耗来检测接收到的信号故障的存在，所述接收信号由雨和雾中的至少一个导致。 所述方法还包括当所感测到的接收到的信号故障是由于雨而在第一链路的RF信道中发送数据时发送数据在第一链路的自由空间光信道中，并且当所感测的接收信号故障是由于雾而发送的。
-
-
-
-
-
-
-
-
-
搜索结果
13 条记录 (耗时 0.011 秒)
