公开(公告)号：US20240297711A1

公开(公告)日：2024-09-05

申请号：US18594774

申请日：2024-03-04

Applicant: GolFoton Holdings, Inc.

Inventor： Kenichiro Takeuchi ,  David Zhi Chen ,  Chi Kong Paul Ng ,  Feng Tian ,  Edward M. Jack

IPC: H04B10/071 ,  H04B10/2537 ,  H04L7/00

CPC classification number: H04B10/071 ,  H04B10/2537 ,  H04L7/0075

Abstract: A characterization system includes an optical fiber apparatus, first and second clocks, an optical transmission device at an apparatus first end, first and second optical receiving devices, and a control unit. The transmission device communicates with the first clock and emits optical pulses along the apparatus. The first receiving device communicates with the first clock and receives backscattered or reflected pulse remaining portions. The second receiving device, at an apparatus second end, communicates with the second clock and receives pulse portions. The apparatus has a length such that the first receiving device does not receive pulse remaining portions backscattered or reflected by the second end. The clocks are synchronized or offset by known values such that the control unit determines a characteristic of the apparatus or of the pulses based on, or using optical data derived from the pulses and associated with, pulse emission and corresponding pulse portion receipt times.

公开(公告)号：US12038320B2

公开(公告)日：2024-07-16

申请号：US17556928

申请日：2021-12-20

Applicant: NEC Laboratories America, Inc.

Inventor： Shaobo Han ,  Yuheng Chen ,  Ming-Fang Huang ,  Tingfeng Li

IPC: G01H9/00 ,  B60W30/18 ,  G06V10/14 ,  G06V10/82 ,  G06V20/52 ,  H04B10/2537

CPC classification number: G01H9/004 ,  B60W30/18 ,  G06V10/14 ,  G06V10/82 ,  G06V20/52 ,  H04B10/2537 ,  B60W2420/406 ,  G06V2201/08

Abstract: A fiber optic sensing technology for vehicle run-off-road incident automatic detection by an indicator of sonic alert pattern (SNAP) vibration patterns. A machine learning method is employed and trained and evaluated against a variety of heterogeneous factors using controlled experiments, demonstrating applicability for future field deployment. Extracted events resulting from operation of our system may be advantageously incorporated into existing management systems for intelligent transportation and smart city applications, facilitating real-time alleviation of traffic congestion and/or providing a quick response rescue and clearance operation.

公开(公告)号：US20240072889A1

公开(公告)日：2024-02-29

申请号：US18236223

申请日：2023-08-21

Applicant: The United States of America, as represented by the Secretary of the Navy

Inventor： Lance S. Doddridge

IPC: H04B10/071

CPC classification number: H04B10/071 ,  H04B10/2537

Abstract: Methods, apparatus, and systems are disclosed for implementing a fiber optic reflectance standard (FORS) for testing and/or calibration of a test instrument (TI), which provides a traceable means to calibrate the making optical return loss measurements (ORLM). The apparatus for implementing the FORS may include an optical splitter, first and second optical inputs coupled to the optical splitter, and an optical fiber having first and second ends, and coupled to the optical splitter at the first end of the optical fiber. Furthermore, the apparatus includes an attenuator (e.g., a mechanical attenuator) configured to contain a portion of the optical fiber between the first and second ends and selectively attenuate optical signal gain of the optical fiber. The testing and/or calibration results in an uncertainty that is at least four times better than a typical test instrument.

公开(公告)号：US11802809B2

公开(公告)日：2023-10-31

申请号：US17281186

申请日：2019-09-18

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keiji Okamoto ,  Atsushi Nakamura ,  Hiroyuki Oshida

IPC: G01M11/02 ,  H01S3/30 ,  H04B10/071 ,  H04B10/2537 ,  G01M11/00 ,  G01D5/353

CPC classification number: G01M11/0207 ,  G01D5/35361 ,  G01D5/35364 ,  G01M11/319 ,  G01M11/3109 ,  H01S3/30 ,  H04B10/071 ,  H04B10/2537

Abstract: The present invention is to provide a backscattered light amplification device, an optical pulse test apparatus, a backscattered light amplification method, and an optical pulse test method for amplifying a desired propagation mode of Rayleigh backscattered light with a desired gain by stimulated Brillouin scattering in a fiber under test having the plurality of propagation modes. The backscattered light amplification device according to the present invention is configured to control individually power, incident timing, and pulse width of a pump pulse for each propagation mode when the pump pulse is incident in a plurality of propagation modes after the probe pulse is input to the fiber under test in any propagation mode.

公开(公告)号：US09973278B2

公开(公告)日：2018-05-15

申请号：US15075512

申请日：2016-03-21

Applicant: ARRIS Enterprises LLC

Inventor： Jun Wang ,  Venkatesh G. Mutalik ,  Marcel F. Schemmann ,  Shamsuddin H. Chasmawala

IPC: H04B10/04 ,  H04B10/516 ,  H04B10/2575 ,  H04B10/58 ,  H04B10/2537

CPC classification number: H04B10/5161 ,  H04B10/2537 ,  H04B10/2575 ,  H04B10/25751 ,  H04B10/58

Abstract: Techniques for transmitting an optical signal through optical fiber with an improved stimulated Brillouin scattering (SBS) suppression and an improved transmitter's signal to noise ratio (SNR) include externally modulating a light beam emitted from a light source with a high frequency signal. The light beam is also modulated externally with an RF information-carrying signal. The high frequency signal is at least twice a highest frequency of the RF signal. The high frequency signal modulating the light source can be split, providing a portion of the split signal to a phase and gain control circuit for adjusting a phase/gain. The output of phase and gain control circuit can be applied to the external modulator to eliminate intensity modulation for SBS suppression improvement. The optical transmitter's SNR is further improved by cancelling a beat between SBS suppression modulation tone and out of band distortion spectrum of information bearing RF signal.

公开(公告)号：US09363583B2

公开(公告)日：2016-06-07

申请号：US14142392

申请日：2013-12-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Zhiping Jiang ,  Jian Zhong

IPC: H04B10/2537 ,  H04Q11/00 ,  H04J14/02

CPC classification number: H04Q11/0005 ,  H04B10/2537 ,  H04J14/0212 ,  H04J14/0221 ,  H04J14/0224 ,  H04J14/0272 ,  H04Q11/0066 ,  H04Q2011/0049 ,  H04Q2011/0083

Abstract: System, apparatus, and method embodiments are provided for suppressing the stimulated Raman scattering (SRS) crosstalk in multiple wavelength channel signals propagating in fiber links, such as in WDM/DWDM or other optical communications systems. The SRS is reduced or suppressed by separating the channels into two sets of different channels, such as even and odd channels, and then performing subtraction of signal amplitudes between the two sets of channels. The channels are separated by an interleaver into the two sets. Alternatively, a wavelength selective switch (WSS) is used to separate the channels into the two sets on which the subtraction of signal amplitudes is then performed. In an embodiment, the signals are low frequency modulation signals used for channel monitoring for optical communications systems.

Abstract translation: 提供了系统，装置和方法实施例，用于抑制在诸如WDM / DWDM或其他光通信系统中的光纤链路中传播的多个波长信道信号中受激拉曼散射（SRS）串扰。 通过将信道分离成两组不同的信道，例如偶数和奇数信道，然后在两组信道之间执行信号幅度的减法来减小或抑制SRS。 通道由交织器分成两组。 或者，使用波长选择开关（WSS）将信道分离成在其中执行信号幅度减法的两组中。 在一个实施例中，信号是用于光通信系统的信道监测的低频调制信号。

公开(公告)号：US09191110B2

公开(公告)日：2015-11-17

申请号：US13493018

申请日：2012-06-11

Applicant: Tiejun J. Xia ,  Glenn A. Wellbrock

Inventor： Tiejun J. Xia ,  Glenn A. Wellbrock

IPC: H04B10/2537 ,  H04B10/40

CPC classification number: H04B10/2537 ,  H04B10/40

Abstract: A method includes monitoring, by a transceiver, a first wavelength corresponding to a transmitted optical signal. The method includes monitoring a second wavelength corresponding to a received optical signal. The method also includes determining whether the first wavelength is identifiably different than the second wavelength. The method includes maintaining a separation between the first and second wavelengths if the first and second wavelengths are identifiably different. The first and second wavelengths are separated if the first and second wavelengths are not identifiably different. The method further includes maintaining the separation between the first and second wavelengths following separation of the first and second wavelengths.

Abstract translation: 一种方法包括通过收发器监测对应于所发送的光信号的第一波长。 该方法包括监视对应于所接收的光信号的第二波长。 该方法还包括确定第一波长是否可识别地与第二波长不同。 如果第一和第二波长可识别地不同，则该方法包括保持第一和第二波长之间的间隔。 如果第一和第二波长不可识别地不同，则第一和第二波长被分离。 该方法还包括在分离第一和第二波长之后保持第一和第二波长之间的间隔。

公开(公告)号：US20120328295A1

公开(公告)日：2012-12-27

申请号：US13276042

申请日：2011-10-18

Applicant: Chien-Hung Yeh ,  Chi-Wai Chow

Inventor： Chien-Hung Yeh ,  Chi-Wai Chow

IPC: H04B10/12

CPC classification number: H04J14/0246 ,  H04B10/2537 ,  H04B10/25754 ,  H04B10/2587 ,  H04J14/025 ,  H04J14/0282 ,  H04J14/0298 ,  H04J2014/0253

Abstract: An optical fiber communication system is provided, including a central office and an optical network unit. The central office generates a first downstream signal and a second downstream signal according to a radio frequency signal and a baseband signal, respectively. The optical network unit is coupled to the central office to receive the first downstream signal and the second downstream signal through a first fiber and a second fiber different from the first fiber, respectively, such that the optical network unit only modulates the second downstream signal to generate an upstream signal and then delivers the upstream signal to the central office through the first fiber, thereby decreasing signal Rayleigh backscatter noise.

Abstract translation: 提供了一种光纤通信系统，包括中心局和光网络单元。 中心局分别根据射频信号和基带信号产生第一下行信号和第二下行信号。 光网络单元耦合到中心局，以通过分别与第一光纤不同的第一光纤和第二光纤分别接收第一下行信号和第二下行信号，使得光网络单元仅将第二下行信号调制为 产生上行信号，然后通过第一条光纤将上行信号传送到中心局，从而降低信号瑞利反向散射噪声。

公开(公告)号：US08121491B2

公开(公告)日：2012-02-21

申请号：US12097670

申请日：2006-10-06

Applicant: Gianmarco Bruno ,  Fabio Cavaliere

Inventor： Gianmarco Bruno ,  Fabio Cavaliere

IPC: H04B10/00

CPC classification number: H04B10/2537 ,  H04B10/07955 ,  H04B10/0797 ,  H04B10/2935

Abstract: A method and apparatus for compensating for channel depletion of a multi-channel signal in an optical link or optical network comprising a chain of optical amplifiers. The method comprises determining channel depletion for each amplifier from the power of the input signal to the optical amplifier and the power of the output signal from the previous amplifier. Each amplifier is then controlled to amplify the signal to a level equal to the nominal (ideal) power plus the calculated channel depletion for that amplifier.

Abstract translation: 一种用于补偿光链路或光网络中的多信道信号的信道消耗的方法和装置，包括一系列光放大器。 该方法包括从输入信号到光放大器的功率和来自前一放大器的输出信号的功率确定每个放大器的信道耗尽。 然后控制每个放大器以将信号放大到等于标称（理想）功率加上该放大器计算的通道耗尽的电平。

公开(公告)号：US20110164658A1

公开(公告)日：2011-07-07

申请号：US13119462

申请日：2009-09-23

Applicant: Denis Penninckx ,  Steve Hocquet

Inventor： Denis Penninckx ,  Steve Hocquet

IPC: H04B1/69

CPC classification number: H04B1/69 ,  H04B10/2537

Abstract: A method for spreading a spectrum of a narrowband signal, e.g. a monochromatic optical signal or a radiofrequency carrier. The method uses a phase modulation using a modulation signal that includes a plurality of sinusoidal components, the plurality including a component at a fundamental frequency and at least one component at a frequency that is a harmonic of the fundamental frequency, the sinusoidal components being synchronous and affected with phases respectively equal to consecutive multiples of π/2.

Abstract translation: 一种用于扩展窄带信号的频谱的方法，例如， 单色光信号或射频载波。 该方法使用包括多个正弦分量的调制信号的相位调制，该多个正弦分量包括基频的分量和基频的谐波频率的至少一个分量，正弦分量是同步的， 受相分别等于＆pgr / 2的连续倍数的相位。