公开(公告)号：US20230006741A1

公开(公告)日：2023-01-05

申请号：US17942278

申请日：2022-09-12

申请人： Huawei Technologies Co., Ltd.

发明人： Yibo Lv ,  Xu Li ,  Tianxiang Wang ,  Weiwei Zhang ,  Rongdao Yu

IPC分类号： H04B10/2575 ,  H04B10/2543 ,  H04J14/02

摘要： A radio over fiber (RoF) system and a nonlinear compensation method, where the RoF system includes a BBU and an RRU, the RRU includes an electrical component, and the BBU includes a downlink and a feedback link. A predistortion module and an optical component are disposed on the downlink, an input end of the feedback link is connected to an output end of the optical component, and the feedback link is configured to feed back, to the predistortion module, a nonlinear signal output by the optical component. The RoF system further includes a temperature detection module configured to detect a temperature value of the electrical component, and transmit the temperature value to the predistortion module. The predistortion module is configured to perform digital predistortion DPD on a baseband signal based on the temperature value and the nonlinear signal.

公开(公告)号：US20220416894A1

公开(公告)日：2022-12-29

申请号：US17845190

申请日：2022-06-21

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： Seung-Hyun CHO ,  Joon Ki LEE

IPC分类号： H04B10/2575 ,  H04L7/04

摘要： Provided is a radio over fiber (RoF)-based distributed antenna system (DAS) structure that cost-effectively provides a fifth generation (5G) mobile communication service guaranteeing a quality of service (QoS) with high bandwidth and low latency characteristics without radio shadowing in an indoor environment.

公开(公告)号：US20220416893A1

公开(公告)日：2022-12-29

申请号：US17762224

申请日：2019-12-11

申请人： Comba Network Systems Company Limited

发明人： Weidong Zhong ,  Shangkun Wu ,  Yangyang Li ,  Li Fan

IPC分类号： H04B10/2575 ,  H04J14/02 ,  H04Q11/00

摘要： An ROF communication remote machine and an ROF system are disclosed. The machine comprises a first packaging module and a second packaging module. The first packaging module comprises a first branch and a second branch The first branch is used for converting a downlink optical signal, and sending the downlink electrical signal to the second packaging module. The second branch receives the downlink electrical signal, converts the downlink electrical signal into a downlink optical signal, sends the downlink optical signal to the local machine, receives an uplink electrical signal, and sends the uplink electrical signal to the local machine. The second packaging module is used for amplifying the power of the downlink electrical signal, filtering the downlink electrical signal, then feeding back the downlink electrical signal to another component, receiving the uplink electrical signal, and sending the uplink electrical signal to the second port.

公开(公告)号：US20220416891A1

公开(公告)日：2022-12-29

申请号：US17846604

申请日：2022-06-22

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： Seung-Hyun CHO ,  Joon Ki LEE

IPC分类号： H04B10/2575 ,  H04B10/077

摘要： A test device and method for testing a distributed feedback laser diode (DFB-LD) device for an optical transceiver of a radio over fiber (RoF) system examines the DFB-LD device based on an absolute limiting rating, an operating case environment, and a functional specification, in which the absolute limiting rating is a rating at which there is no fatal damage to the DFB-LD device during a short period of time when each limiting parameter is isolated and all other parameters are in a normal performance parameter, the operating case environment includes an operating temperature, and the functional specification includes parameters to be tested according to an operating condition for the functional specification.

公开(公告)号：US20220416487A1

公开(公告)日：2022-12-29

申请号：US17902804

申请日：2022-09-03

申请人： HOLLAND ELECTRONICS LLC

发明人： Michael Holland ,  George Goebel

IPC分类号： H01R25/00 ,  H01R33/945 ,  H01R33/76 ,  H04B10/2575 ,  H01R31/02 ,  H01R33/88 ,  H01R13/447

摘要： A coaxial tap in a hybrid fiber coaxial cable distribution system serves subscribers with an RF signal.

公开(公告)号：US11539430B2

公开(公告)日：2022-12-27

申请号：US16809504

申请日：2020-03-04

申请人： Infinera Corporation

发明人： Amir Jafari ,  David F. Welch ,  Steven Joseph Hand ,  Mohamed Osman

IPC分类号： H04B10/50 ,  H04B7/26 ,  H04B10/548 ,  H04B10/61 ,  H04B10/69 ,  H04J14/02 ,  H04L1/00 ,  H04L5/00 ,  H04J14/08 ,  H04J14/00 ,  H04B10/077 ,  H04B10/079 ,  H04B10/25 ,  H04B10/40 ,  H04Q11/00 ,  H04B10/2575

摘要： Consistent the present disclosure, a network or system is provided in which a hub or primary node may communication with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity that may be greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from and supply data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, and optical add/drop multiplexer, for example. Consistent with an aspect of the present disclosure, optical subcarriers may be transmitted over such connections. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. In addition, the subcarriers may be employed using multiple access techniques, such as frequency division multiplexing (FDM), code-division multiple access (CDMA), and time-division multiple access so that the primary node can communicate with a relatively large number of secondary nodes. In addition, an out-of-band control channel may be provided to carry OAM information from the primary node to the secondary nodes, as well as from the secondary nodes to the primary nodes.

公开(公告)号：US11539396B1

公开(公告)日：2022-12-27

申请号：US17085949

申请日：2020-10-30

申请人： CABLE TELEVISION LABORATORIES, INC.

发明人： Mario Di Dio ,  Stephen Glennon

IPC分类号： H04L12/66 ,  H04B3/52 ,  H04B10/2575 ,  H04B3/54

摘要： An interface device for communicatively coupling a first communication medium and a second communication medium includes a radio frequency (RF) processor and a frequency shifting subsystem. The RF processor is configured to receive a first data signal from the first communication medium and convert the first data signal to a plurality of first internal RF signals having a common center frequency. The frequency shifting subsystem is configured to shift the plurality of first internal RF signals having the common center frequency to respective first external RF signals having different respective center frequencies, for transmission on the second communication medium. The second communication medium may be a coaxial electrical cable.

公开(公告)号：US11536955B2

公开(公告)日：2022-12-27

申请号：US16336594

申请日：2017-09-26

申请人： Blickfeld GmbH

发明人： Florian Petit

IPC分类号： G02B26/10 ,  H02N2/04 ,  H02N2/06 ,  H04B10/2575 ,  A61B1/07 ,  B06B1/06 ,  A61B1/00 ,  H01Q1/32

摘要： A device (100) for the excitation of a fiber (150) comprises a first piezo bender actuator (110) and a second piezo bender actuator (120). The device (100) also comprises a connection part (130) which is arranged between the first piezo bender actuator (110) and the second piezo bender actuator (120). The device (100) also comprises a movable fiber (150) which is mounted to the connection part (130).

公开(公告)号：US20220385368A1

公开(公告)日：2022-12-01

申请号：US17775718

申请日：2019-11-25

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Kota ITO ,  Mizuki SUGA ,  Yushi SHIRATO ,  Naoki KITA

IPC分类号： H04B10/2575

摘要： An accommodation station transmission unit modulates light based on an RF signal to generate an optical signal and outputs the generated optical signal, a base station transmission unit demultiplexes the output optical signal for each of wavelengths, outputs the demultiplexed optical signals, converts the demultiplexed optical signals into electrical signals to demodulate the RF signal, outputs the demodulated RF signal, and each of first ports of a matrix operation unit including the plurality of first ports and a plurality of second ports and configured to use each of the first ports as a reference port and perform, on signals obtained by the reference ports, a BFN matrix operation of performing phase changes that are different for each of positions of the reference ports and cause each of phases of signals output from the plurality of second ports to have a linear inclination receives the demodulated RF signal and forms transmission beams in different directions for each of wavelengths by a plurality of transmission antennas emitting the RF signal output by each of the second ports of the matrix operation unit.

公开(公告)号：US11515945B2

公开(公告)日：2022-11-29

申请号：US17322156

申请日：2021-05-17

申请人： Phase Sensitive Innovations, Inc.

发明人： Chris Schuetz ,  Janusz Murakowski ,  Garrett Schneider ,  Shouyuan Shi ,  Dennis Prather

IPC分类号： H04B10/516 ,  H01Q3/26 ,  H04B10/2575 ,  H04B1/16 ,  H04B10/11 ,  H04B10/64

摘要： A method of RF signal processing comprises receiving an incoming RF signal at each of a plurality of antenna elements that are arranged in a first pattern. The received RF signals from each of the plurality of antenna elements are modulated onto an optical carrier to generate a plurality of modulated signals that each have at least one sideband. The modulated signals are directed along a corresponding plurality of optical channels with outputs arranged in a second pattern corresponding to the first pattern. A composite optical signal is formed using light emanating from the outputs of the plurality of optical channels. Non-spatial information contained in at least one of the received RF signals is extracted from the composite signal.