公开(公告)号：US12038345B2

公开(公告)日：2024-07-16

申请号：US17135065

申请日：2020-12-28

Applicant: SUBCOM, LLC

Inventor： Georg Heinrich Mohs ,  Alexei N. Pilipetskii

IPC: G01M11/08 ,  H01S3/067 ,  H01S3/16 ,  H01S3/23

CPC classification number: G01M11/088 ,  H01S3/06716 ,  H01S3/06754 ,  H01S3/06787 ,  H01S3/1608 ,  H01S3/2316

Abstract: Techniques for extending distributed acoustic sensing (DAS) range in undersea optical cables are provided. For example, DAS range can be extended by transmitting and amplifying a DAS signal along multiple spans of a first optical fiber, routing or bypassing the DAS signal from the first optical fiber to a second optical fiber different from the first fiber via a high-loss loopback architecture, and returning and amplifying the DAS signal along the same multiple spans back to a DAS device. The DAS device may then receive and process the DAS signal to detect any changes in the DAS environment. The loopback configuration may be based on different types of loopback architecture.

公开(公告)号：US12034482B2

公开(公告)日：2024-07-09

申请号：US17336280

申请日：2021-06-01

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Eduardo Mateo Rodriguez ,  Shinsuke Fujisawa ,  Hussam Batshon ,  Kohei Nakamura ,  Takanori Inoue ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: H04B10/2537 ,  G01H9/00 ,  H01S3/067 ,  H01S3/10 ,  H01S3/16 ,  H01S3/30 ,  H04B10/073 ,  H04B10/61

CPC classification number: H04B10/2537 ,  G01H9/004 ,  H01S3/06716 ,  H01S3/10061 ,  H01S3/1608 ,  H01S3/302 ,  H04B10/073 ,  H04B10/615

Abstract: Aspects of the present disclosure are directed to systems, methods, and structures providing for the accurate measurement of guided acoustic-wave Brillouin scattering in optical fiber transmission systems and facilities.

公开(公告)号：US12015235B2

公开(公告)日：2024-06-18

申请号：US17266114

申请日：2018-10-31

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Jiulin Gan ,  Zhongmin Yang ,  Xiaobo Heng ,  Zhishen Zhang

IPC: H01S3/00 ,  H01S3/067

CPC classification number: H01S3/06783 ,  H01S3/06712 ,  H01S3/06716 ,  H01S3/06791

Abstract: Disclosed is an all-fiber optical vortex laser based on resonance of orbital angular momentum modes. The all-fiber optical vortex laser has an annular cavity structure, and includes a narrow-linewidth pump laser, an optical amplifier, an orbital angular momentum mode generator, a first polarization controller, an optical fiber circulator, an optical fiber coupler, a second polarization controller and a vortex optical fiber. The orbital angular momentum mode generator (3) realizes directional conversion from a fundamental transverse mode in a single-mode optical fiber into an orbital angular momentum mode with a specific topological charge in a vortex optical fiber. The optical fiber coupler can realize directional coupling from an orbital angular momentum mode in one vortex optical fiber to an orbital angular momentum mode in another vortex optical fiber; the vortex optical fiber is an optical fiber supporting stable transmission of an orbital angular momentum mode.

公开(公告)号：US20240178630A1

公开(公告)日：2024-05-30

申请号：US18071880

申请日：2022-11-30

Applicant: Cybel, LLC.

Inventor： Wiktor Tomasz Walasik ,  Jean-Marc Pierre Delavaux ,  Alexandre Amavigan

IPC: H01S3/094 ,  H01S3/00 ,  H01S3/067 ,  H01S3/106 ,  H01S3/16

CPC classification number: H01S3/094011 ,  H01S3/0064 ,  H01S3/06716 ,  H01S3/06733 ,  H01S3/094042 ,  H01S3/106 ,  H01S3/1608 ,  H01S3/161 ,  H01S3/1616 ,  H01S3/1618 ,  H01S2301/02

Abstract: A high-power ASE source in the 2 μm wavelength band is achieved by using a relatively high-power pump beam that is generated within a fiber laser-based pump source. An optical isolator is included along the pump output path and is critical in maximizing the level of output power in the generated ASE, since without its use the ASE source begins to exhibit self-lasing cavity modes at a relatively low power level. Various embodiments of the present invention are based upon the use of a two-stage (or more) arrangement for generating a high-power ASE output, including an ASE-generating stage for establishing the broadband ASE spectrum and an amplifier stage for increasing the optical power within the ASE spectrum. The amplifier stage itself may include one or more individual amplifying elements in a concatenated arrangement. Optical isolators are included along the signal paths to prevent the type of reflections that would otherwise trigger self lasing.

公开(公告)号：US11955764B2

公开(公告)日：2024-04-09

申请号：US16980478

申请日：2018-08-27

Applicant: HUAWEI MARINE NETWORKS CO., LTD.

Inventor： Changwu Xu ,  Yuhe Li ,  Ge Jin ,  Yan Wang ,  Liping Ma

IPC: H01S3/30 ,  H01S3/067 ,  H01S3/094 ,  H04B10/291 ,  H04B10/293

CPC classification number: H01S3/06754 ,  H01S3/06716 ,  H01S3/06737 ,  H01S3/094053 ,  H01S3/094061 ,  H01S3/09408 ,  H04B10/2912 ,  H04B10/293

Abstract: Disclosed is a submarine network device, comprising a fiber set, a pump laser set, an erbium doped fiber amplifier (EDFA) set, a primary fiber coupler (CPL) set and a secondary CPL set, wherein the primary CPL set comprises N primary CPLs, the secondary CPL set comprises N secondary CPLs, with N being an integer greater than or equal to 3. The fiber set is configured to connect the pump laser set, the primary CPL set, the secondary CPL set and the EDFA set. An input port of each primary CPL in the primary CPL set is at least connected with a pump laser. An output port of each secondary CPL in the secondary CPL set is at least connected with an EDFA. Output ports of each primary CPL in the primary CPL set are respectively connected with two different secondary CPLs that are spaced by a secondary CPL, and input ports of each secondary CPL in the secondary CPL set are respectively connected with two different primary CPLs that are spaced by a primary CPL.

公开(公告)号：US11901690B2

公开(公告)日：2024-02-13

申请号：US17416873

申请日：2020-02-21

Applicant: Fujikura Ltd.

Inventor： Yasuo Nakanishi ,  Yasuhiro Mashiko ,  Shinichi Sakamoto ,  Kensuke Shima

IPC: H01S3/067 ,  H01S3/16 ,  H01S3/00

CPC classification number: H01S3/0675 ,  H01S3/0078 ,  H01S3/06716 ,  H01S3/1618

Abstract: A fiber laser device includes a pumping light source, an amplifying fiber, an input side fiber fusion-spliced on an input side of the amplifying fiber and formed with a HR-FBG, an output side fiber fusion-spliced on an output side of the amplifying fiber and formed with an OC-FBG having a reflectivity smaller than that of the HR-FBG, an output end, and a mode filter, wherein the input side fiber or an intermediate fiber disposed between the amplifying fiber and the input side fiber is fusion-spliced with the amplifying fiber via a fusion splice portion, and at least a portion of the mode filter is disposed in a region between the fusion splice portion and a position separated from the fusion splice portion by a coherence length of beating caused by mode interference of signal light propagating in the amplifying fiber.

公开(公告)号：US11757245B2

公开(公告)日：2023-09-12

申请号：US17160073

申请日：2021-01-27

Applicant: University of Washington

Inventor： Peter J. Pauzauskie ,  Anupum Pant ,  Xiaojing Xia ,  Elena Dobretsova ,  E. James Davis ,  Alexander B. Bard ,  Robert G. Felsted

IPC: H01S3/04 ,  H01S3/067

CPC classification number: H01S3/0408 ,  H01S3/06716

Abstract: An apparatus and method for cooling an optical fiber, comprising impinging electromagnetic radiation from a laser on an optical fiber comprising a core, in which the electromagnetic radiation is substantially confined, and a cladding, in thermal communication with the core, configured to provide optically activated cooling of the core via the electromagnetic radiation from the laser.

公开(公告)号：US20230194412A1

公开(公告)日：2023-06-22

申请号：US18082739

申请日：2022-12-16

Applicant: VERSITECH LIMITED ,  ADVANCED BIOMEDICAL INSTRUMENTATION CENTRE LIMITED

Inventor： Kenneth Kin Yip WONG ,  Jiawei SHI ,  Mingsheng LI ,  Jiqiang KANG

IPC: G01N21/17 ,  H01S3/067 ,  H01S3/10 ,  H01S3/094 ,  H01S3/00 ,  H01S3/16 ,  H01S3/108 ,  G02F1/39 ,  H01S3/23 ,  H03F3/19 ,  G01N33/483

CPC classification number: G01N21/1702 ,  H01S3/06716 ,  H01S3/10038 ,  H01S3/094015 ,  H01S3/06791 ,  H01S3/1003 ,  H01S3/005 ,  H01S3/1608 ,  H01S3/1083 ,  G02F1/395 ,  H01S3/1616 ,  H01S3/2316 ,  H03F3/19 ,  G01N33/4833 ,  H03F2200/451 ,  H03F2200/294 ,  G01N2201/06113 ,  G01N2201/08 ,  G01N2201/0633 ,  G01N2201/103 ,  G01N2021/1706

Abstract: An optical-resolution photoacoustic microscopy (OR-PAM) system for visualizing water content deep in biological tissue uses an all-fiber 1930-nm hybrid optical parametrically-oscillating emitter. The emitter includes a tunable laser source whose output is amplified by a first erbium-doped fiber amplifier (EDFA). The output of the first amplifier is modulated with a Mach-Zehnder amplitude modulator that receives an RF signal with a nanosecond pulse width and a multiple kilohertz repetition rate. A second EDFA further amplifies the signal and passes it to a fiber circulator that in turn delivers it to a 1950/1550 mm fiber wavelength-division-multiplexing coupler WDM. The coupler introduces the signal to a cavity that includes a spool of highly nonlinear fiber and a Thulium-doped fiber amplifier TDFA. From the TDFA the signal reaches a 50/50 fiber coupler that sends part to a second output TDFA and guides part back to the cavity through a port of the WDM.

公开(公告)号：US20190006817A1

公开(公告)日：2019-01-03

申请号：US16124434

申请日：2018-09-07

Applicant: GIGAPHOTON INC.

Inventor： Takashi ONOSE ,  Osamu WAKABAYASHI

IPC: H01S3/23 ,  H01S3/16 ,  H01S3/067 ,  G02F1/35 ,  G02F1/355 ,  H01S3/109 ,  H01S3/115 ,  H01S3/11 ,  H01S3/108

CPC classification number: H01S3/2308 ,  G02F1/353 ,  G02F1/3532 ,  G02F1/3551 ,  G02F2001/354 ,  H01S3/0092 ,  H01S3/06716 ,  H01S3/06754 ,  H01S3/09415 ,  H01S3/0971 ,  H01S3/10007 ,  H01S3/10015 ,  H01S3/1003 ,  H01S3/108 ,  H01S3/109 ,  H01S3/11 ,  H01S3/115 ,  H01S3/1618 ,  H01S3/2325 ,  H01S3/2366 ,  H01S3/2375 ,  H01S3/2391

Abstract: A solid state laser device includes a seed laser that outputs continuous wave laser seed light, a light intensity changeable unit that changes a light intensity thereof and outputs seed pulse light, a CW excitation laser that outputs continuous wave excitation light, an amplifier that amplifies the seed pulse light and outputs amplified light based on an amplification gain increased by the excitation light, a wavelength conversion unit that converts a wavelength of the amplified light and outputs harmonic light, and a light intensity control unit that allows the light intensity changeable unit to output the seed pulse light after a certain time elapsed from an input of an external trigger signal each time the signal is input and output suppression light that suppresses an increase of the amplification gain in a period after an output of the seed pulse light until an input of a next external trigger signal.

公开(公告)号：US10014645B2

公开(公告)日：2018-07-03

申请号：US15356845

申请日：2016-11-21

Applicant: IMRA AMERICA, INC.

Inventor： Donald J. Harter

IPC: H01S3/30 ,  H01S3/00 ,  H01S3/067 ,  H01S3/08 ,  H01S3/094 ,  H01S3/10 ,  H01S3/16 ,  H04B10/508 ,  H01S3/11 ,  H01S3/0941 ,  G02B6/293 ,  H01S3/23 ,  H01S5/00

CPC classification number: H01S3/0057 ,  G02B6/2932 ,  G02B6/29374 ,  H01S3/067 ,  H01S3/06708 ,  H01S3/06716 ,  H01S3/06725 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/08013 ,  H01S3/094003 ,  H01S3/094076 ,  H01S3/0941 ,  H01S3/10046 ,  H01S3/11 ,  H01S3/1106 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2308 ,  H01S5/0057 ,  H04B10/508

Abstract: System for converting relatively long pulses from rep-rate variable ultrafast optical sources to shorter, high-energy pulses suitable for sources in high-energy ultrafast lasers. Fibers with positive group velocity dispersion (GVD) and self phase modulation are advantageously employed with the optical sources. These systems take advantage of the need for higher pulse energies at lower repetition rates so that such sources can be cost effective.