公开(公告)号：US20230095744A1

公开(公告)日：2023-03-30

申请号：US17578538

申请日：2022-01-19

申请人： Korea Advanced Institute of Science and Technology

发明人： Junil Choi ,  Geonho Han ,  Hyuckjin Choi ,  Beomsoo Ko

IPC分类号： H04B10/116 ,  H04B10/532 ,  H04J14/06 ,  H04B10/61

摘要： A method and an apparatus for polarization multiplexing and encoding in a visible light communication system based on a gold nanoparticle are provided. A method for encoding in a receiver using a polarizing characteristic in a visible light communication system based on a gold nanoparticle, which is performed by a computer device, includes splitting a receive signal into left circular polarization light and right circular polarization light by allowing the receive signal to pass through a linear polarizer and estimating a phase retardation difference, and detecting a transmit symbol by estimating the phase retardation difference.

公开(公告)号：US20230094424A1

公开(公告)日：2023-03-30

申请号：US18075938

申请日：2022-12-06

申请人： Google LLC

发明人： Xiang Zhou ,  Hong Liu

IPC分类号： H04B10/556 ,  H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  H04J14/06

摘要： A receiver system is provided for receiving a coherent Pulse Amplitude Modulation (PAM) encoded signal. The receiver system may include an optical polarization component configured to modulate a polarization of the received coherent PAM encoded signal. The receiver system may further include a digital signal processor (DSP) configured to perform polarization recovery between the received coherent PAM encoded signal and the LO signal using a first control loop, and to perform phase recovery between the received coherent PAM encoded signal and the LO signal using a second control loop.

公开(公告)号：US11588573B2

公开(公告)日：2023-02-21

申请号：US17305925

申请日：2021-07-16

申请人： INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE

发明人： Junliang Dong ,  Alessandro Tomasino ,  Giacomo Balistreri ,  Aycan Yurtsever ,  José Azaña ,  Yoann Jestin ,  Roberto Morandotti

IPC分类号： H04J14/06 ,  H01P3/10 ,  G02B6/293

摘要： A THz waveguide is described, comprising four conductive wires separated by an air gap, the THz waveguide allowing low-loss and dispersion-free propagation of a THz signal. The system for terahertz polarization-division multiplexing comprises at least two THz sources, a THz waveguide and a THz receiver, wherein said THz waveguide comprises four conductive wires separated by an air gap; THz pulses from the THz sources being coupled into the THz waveguide; the THz waveguide transmitting the THz pulses independently, the THz waveguide operating as a broadband polarization-division multiplexer. The method for terahertz polarization-division multiplexing, comprising multiplexing THz pulses from terahertz sources in free-space, coupling resulting multiplexed THz pulses into a THz waveguide comprising four conductive wires separated by an air gap; and demultiplexing the multiplexed THz pulses after propagation in the waveguide.

公开(公告)号：US11546061B2

公开(公告)日：2023-01-03

申请号：US17195215

申请日：2021-03-08

申请人： CABLE TELEVISION LABORATORIES, INC.

发明人： Junwen Zhang ,  Zhensheng Jia ,  Luis Alberto Campos ,  Haipeng Zhang ,  Mu Xu ,  Jing Wang ,  Curtis Dean Knittle ,  Chuang Zhou

IPC分类号： H04B10/04 ,  H04B10/50 ,  H04J14/06 ,  H04J14/04 ,  H04B10/63 ,  H04B10/64 ,  H04B10/532

摘要： An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.

公开(公告)号：US11509396B2

公开(公告)日：2022-11-22

申请号：US17433099

申请日：2020-03-19

申请人： Nippon Telegraph and Telephone Corporation

发明人： Yusuke Nasu ,  Shogo Yamanaka ,  Yuichiro Ikuma

IPC分类号： H04B10/40 ,  H04J14/06 ,  G02F1/225 ,  G02F2/00 ,  H04B10/532 ,  H04B10/61

摘要： Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source variable between a transmission side and a receiving side according to a system to be used. The polarization multiplexing optical transmitting and receiving circuit includes an optical variable branching circuit that branches the light output from the light source, a light fixing symmetric branching circuit connected to one of outputs of the optical variable branching circuit and a light fixing asymmetric branching circuit connected to the other, optical receivers connected to two outputs of the light fixing symmetric branching circuit, respectively, optical transmitters connected to two outputs of the light fixing asymmetric branching circuit, a polarized wave rotator connected to one of the optical transmitters, and a polarized wave multiplexer that polarization-multiplexes the outputs of the optical transmitters.

公开(公告)号：US20220352986A1

公开(公告)日：2022-11-03

申请号：US17867072

申请日：2022-07-18

申请人： Cable Television Laboratories, Inc.

发明人： Luis Alberto Campos

IPC分类号： H04B10/50 ,  H04B10/63 ,  H04B10/532 ,  H04B10/64 ,  H04J14/06 ,  H04J14/04

摘要： Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a narrow band seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the received seed source may enable upstream communications at varying wavelengths. The fiber node may provide each seed source by filtering (e.g., by a grating filter) a broadband light source.

公开(公告)号：US11476949B2

公开(公告)日：2022-10-18

申请号：US16370873

申请日：2019-03-29

申请人： CABLE TELEVISION LABORATORIES, INC

发明人： Luis Alberto Campos ,  Zhensheng Jia ,  Matthew D. Schmitt

IPC分类号： H04B10/516 ,  H04B10/61 ,  H04B10/63 ,  H04J14/02 ,  H04L12/28 ,  H04B10/27 ,  H04B10/40 ,  H04J14/06

摘要： A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

公开(公告)号：US20220278766A1

公开(公告)日：2022-09-01

申请号：US17228098

申请日：2021-04-12

申请人： Google LLC

发明人： Xiang Zhou ,  Cedric F. Lam ,  Ryohei Urata ,  Hong Liu

IPC分类号： H04J14/06 ,  H04B10/50 ,  H04B10/61

摘要： Coherent optical communications technology for recovery of 1D and 2D formatted optical signals. For example, 1D or 2D formatted signals that travel through fiber optic media may be recovered by separating the light into X- and Y-polarization components, rotating one polarization component (e.g., Y-component) into the polarization space of the other component (e.g., Y-component into the X-polarization space), delaying the rotated component enough to avoid destructive interference and combining the delayed component with the undelayed component to form a folded optical signal, which may then be processed as a X-polarized signal.

公开(公告)号：US11418260B2

公开(公告)日：2022-08-16

申请号：US17089698

申请日：2020-11-04

申请人： THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

发明人： Nikola Alic ,  Stojan Radic

IPC分类号： H04B10/2543 ,  H04B10/50 ,  H04B10/572 ,  H04B10/61 ,  H04J14/02 ,  H04B10/69 ,  H04J14/06 ,  H04L25/03

摘要： A system and method for mitigating nonlinearity in an optical communication link with multiple carriers uses mutual frequency referencing to stabilize at least a portion of the multiple carriers. Using at least one frequency-referenced signal, carrier nonlinearity can be determined and compensated within the link by pre-distortion, back-propagation, or a combination of both. Mutual frequency referencing may be performed at the emitting end of the link, at the receiving end, or a combination of both.

公开(公告)号：US20220255631A1

公开(公告)日：2022-08-11

申请号：US17564736

申请日：2021-12-29

申请人： FUJITSU LIMITED

发明人： Jingnan LI ,  Yangyang FAN ,  Zhenning TAO

IPC分类号： H04B10/61 ,  H04J14/06

摘要： A polarization change tracking apparatus, a processing apparatus for a received signal and methods thereof. The polarization change tracking method includes: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive; and performing compensation for polarization change on the received signal according to a set response coefficient of polarization tracking.