公开(公告)号：US20240204873A1

公开(公告)日：2024-06-20

申请号：US18556434

申请日：2021-04-27

申请人： Nippon Telegraph and Telephone Corporation

发明人： Hiroki KAWAHARA ,  Takeshi SEKI

IPC分类号： H04B10/2581 ,  H04B10/69

CPC分类号： H04B10/2581 ,  H04B10/697

摘要： A multipath interference analysis device includes a statistical amount calculation unit that calculates statistical amounts of respective measurement values of splice loss measured from a plurality of optical fiber pieces for forming an optical transmission line, and measurement values of cutoff wavelength, a determination unit that determines a truncated normal distribution from a normal distribution of the cutoff wavelength, a random number generation unit that generates random numbers for selecting a predetermined number of pieces of splice connection targets of the optical transmission line, and an MPI value calculation unit that calculates an MPI value using a mode dependent loss of a fundamental mode of the optical transmission line formed of each piece selected according to the random numbers, and a splice interval.

公开(公告)号：US11811457B2

公开(公告)日：2023-11-07

申请号：US18022976

申请日：2021-07-21

申请人： GUANGDONG UNIVERSITY OF TECHNOLOGY

发明人： Yuncai Wang ,  Yimin Huang ,  Yuehui Sun ,  Wenjie Liu ,  Zhensen Gao ,  Yu Cheng

IPC分类号： H04B10/508 ,  H04B10/69

CPC分类号： H04B10/508 ,  H04B10/697

摘要： A method for generating millimeter wave noise with a flat RF (radio frequency) spectrum includes the following steps. A noise optical signal with an optical spectrum in Gaussian shape is output by a first optical emission module. The noise optical signal is transmitted to an optical coupler. n beams of noise optical signals with optical spectra in Gaussian shape is output by a second optical emission module. The noise optical signals is transmitted to the optical coupler. The noise light generated by the first optical emission module and the second optical emission module is coupled to the optical coupler. The coupled optical signals is transmitted to a photodetector. The beat frequency is performed by the photodetector to realize mapping transformation from the optical spectra to the RF spectra. The flat millimeter wave noise is output.

公开(公告)号：US11799550B2

公开(公告)日：2023-10-24

申请号：US17734338

申请日：2022-05-02

申请人： CABLE TELEVISION LABORATORIES, INC.

发明人： Zhensheng Jia ,  Luis Alberto Campos ,  Curtis Dean Knittle ,  Jing Wang

IPC分类号： H04B10/2507 ,  H04B10/54 ,  H04B10/69 ,  H03M3/00

CPC分类号： H04B10/2507 ,  H04B10/541 ,  H04B10/697 ,  H03M3/424 ,  H03M3/43

摘要： An analog signal processor includes a sampling unit configured to (i) filter, in the frequency domain, a received time domain analog signal into a low-frequency end of a corresponding frequency spectrum, (ii) sample the filtered analog signal at a frequency substantially higher than the low-frequency end, and (iii) spread quantization noise over an expanded Nyquist zone of the corresponding frequency spectrum. The processor further includes a noise shaping unit configured to shape the spread quantization noise out of the low-frequency end of the corresponding frequency spectrum such that the filtered analog signal and the shaped quantization noise are substantially separated in the frequency domain, and a quantization unit configured to apply delta-sigma modulation to the filtered analog signal using at least one quantization bit, and output a digitized bit stream that substantially follows the amplitude of the received time domain analog signal.

公开(公告)号：US11742952B2

公开(公告)日：2023-08-29

申请号：US17871176

申请日：2022-07-22

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： Han Hyub Lee ,  Hwan Seok Chung

IPC分类号： H04J14/00 ,  H04B10/508 ,  H04B10/69 ,  H04B10/50 ,  H04B10/40

CPC分类号： H04B10/508 ,  H04B10/40 ,  H04B10/504 ,  H04B10/697

摘要： Provided is a burst mode optical transmitter capable of preventing an optical signal from being output from a light source during burst mode disable time through an arithmetic circuit configured to remove an idle signal included in a MAC electrical signal by using a MAC electrical signal and a burst mode control signal.

公开(公告)号：US11716150B2

公开(公告)日：2023-08-01

申请号：US16811194

申请日：2020-03-06

申请人： Nokia Solutions and Networks OY

发明人： Qian Hu ,  Robert Borkowski

IPC分类号： H04B10/60 ,  H04B10/69

CPC分类号： H04B10/6911 ,  H04B10/697 ,  H04B10/6932 ,  H04B10/6933

摘要： An optical receiver capable of substantially measuring the phase and amplitude of a received intensity- or amplitude-modulated optical signal by performing digital-signal processing. In an example embodiment, a DSP of the receiver operates to reduce the detrimental effects of relative phase noise between the optical reference oscillator and optical carrier based on an optical pilot present in the received optical signal. The DSP may employ a sequence of digital filters configured to select a signal component that represents a non-vestigial modulation sideband and then perform signal equalization thereon. The signal equalization may include but is not limited to dispersion compensation. In some embodiments, the optical receiver can be a direct-detection optical receiver. In an example embodiment, the optical reference oscillator and optical carrier are generated using two respective independently running lasers that may or may not be co-located.

公开(公告)号：US11652556B2

公开(公告)日：2023-05-16

申请号：US16979157

申请日：2019-03-08

申请人： University of Southern California

发明人： Fatemeh Alishahi ,  Yinwen Cao ,  Ahmad Fallahpour ,  Amirhossein Mohajerin-Ariaei ,  Alan E. Willner

IPC分类号： H04B10/69 ,  H04B10/2543 ,  H04B10/2557 ,  H04B10/61 ,  H04J14/02

CPC分类号： H04B10/697 ,  H04B10/2543 ,  H04B10/2557 ,  H04B10/615 ,  H04J14/0201

摘要： A method for all-optical reduction of inter-channel crosstalk for spectrally overlapped optical signals for maximizing utilization of an available spectrum includes receiving a plurality of spectrally overlapped optical signals modulated with data. The method further includes generating conjugate copies of each of the plurality of optical signals using non-linear optics. The method further includes selecting the conjugate copies and adjusting an amplitude, a phase, and a delay of the conjugate copies. The method further includes performing inter-channel interference (ICI) compensation on the spectrally overlapped optical signals in an optical domain by adding the adjusted conjugate copies to the spectrally overlapped optical signals.

公开(公告)号：US20230144071A1

公开(公告)日：2023-05-11

申请号：US17871176

申请日：2022-07-22

申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

发明人： Han Hyub LEE ,  Hwan Seok CHUNG

IPC分类号： H04B10/508 ,  H04B10/40 ,  H04B10/50 ,  H04B10/69

CPC分类号： H04B10/508 ,  H04B10/40 ,  H04B10/504 ,  H04B10/697

摘要： Provided is a burst mode optical transmitter capable of preventing an optical signal from being output from a light source during burst mode disable time through an arithmetic circuit configured to remove an idle signal included in a MAC electrical signal by using a MAC electrical signal and a burst mode control signal.

公开(公告)号：US20190028199A1

公开(公告)日：2019-01-24

申请号：US16040870

申请日：2018-07-20

申请人： CABLE TELEVISION LABORATORIES, INC

发明人： Thomas H. Williams ,  Luis Alberto Campos ,  Zhensheng Jia

IPC分类号： H04B10/2513 ,  H04B10/69

CPC分类号： H04B10/2513 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/697 ,  H04B10/6971 ,  H04B10/6972

摘要： An optical signal receiver includes a processor, a memory, an input, an output, and a sampling unit in operable communication with the processor and the memory. The sampling unit includes a shift register and a clock, and is configured to receive a laser signal at the input, collect a first sample of the received input laser signal at a first time interval, determine an amplitude of the first sample, assign a first symbol of a plurality of symbols to the determined amplitude, insert the first symbol at a first insertion point within the shift register, and generate a delay value at the output based on a position of the first insertion point with respect to the output.

公开(公告)号：US20180239419A1

公开(公告)日：2018-08-23

申请号：US15685327

申请日：2017-08-24

申请人： WiseJet, Inc.

发明人： Inn Yeal OH ,  Byeong Nam AHN ,  Chul Soon PARK

IPC分类号： G06F3/01 ,  H04B10/69

CPC分类号： G06F3/012 ,  H01Q3/2611 ,  H04B10/697

摘要： Disclosed is a wireless transceiver system including an image transmitting apparatus and an image receiving apparatus. The image receiving apparatus includes a receiving antenna having a head direction set for each received beam and a control unit that measures one or more of received signal strength, bit error rate, and signal to noise ratio for each received beam and tracks a receiving beam direction so as to track the received beam and create head tracking information.

公开(公告)号：US10020887B2

公开(公告)日：2018-07-10

申请号：US15418267

申请日：2017-01-27

申请人： FUJITSU LIMITED

发明人： Daisuke Masunaga ,  Akira Toyomane ,  Katsutoshi Usami ,  Masaaki Okada

IPC分类号： H04B10/2575 ,  H04B10/2507 ,  H04B10/69 ,  H04B10/50

CPC分类号： H04B10/2507 ,  H04B10/0799 ,  H04B10/25752 ,  H04B10/25753 ,  H04B10/5057 ,  H04B10/697 ,  H04B2210/254

摘要： A wireless communication system includes a baseband processing device configured to transmit a data signal via an optical transmission line, and a wireless device configured to receive the data signal via the optical transmission line and carry out wireless transmission of an output signal obtained by amplifying the data signal, wherein the wireless device is configured to amplify the data signal to generate the output signal, generate a feedback signal according to the output signal, and transmit the feedback signal to the baseband processing device via the optical transmission line, and wherein the baseband processing device is configured to acquire the feedback signal from the wireless device, and execute first processing of multiplying the data signal by a distortion compensation coefficient corresponding to an inverse characteristic of distortion in the radio frequency circuit based on the feedback signal.