公开(公告)号：US20250055573A1

公开(公告)日：2025-02-13

申请号：US18717521

申请日：2021-12-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kyo MINOGUCHI ,  Etsushi YAMAZAKI ,  Yoshiaki KISAKA ,  Kengo HORIKOSHI ,  Seiji OKAMOTO ,  Masanori NAKAMURA

IPC: H04B10/61 ,  H04B10/294

Abstract: A gain adjustment method in an optical transmission system that performs communication by a digital coherent system including an optical transmission device and an optical reception device includes converting an optical signal transmitted from the optical transmission device into an electrical signal, converting the electrical signal from an analog signal to a digital signal, performing first signal processing on the digital signal, performing adaptive equalization processing on the digital signal subjected to the first signal processing using a digital filter, correcting an amplitude of an output signal of the digital filter based on information of the amplitude and a phase of the output signal of the digital filter and the amplitude of a known transmission signal, and performing second signal processing on the output signal of the digital filter whose amplitude has been corrected.

公开(公告)号：US20240405883A1

公开(公告)日：2024-12-05

申请号：US18325933

申请日：2023-05-30

Applicant: Cisco Technology, Inc.

Inventor： Long CHEN ,  Qianfan XU ,  Jon ROTH

IPC: H04B10/61 ,  H04B10/294 ,  H04B10/50

Abstract: A receiver comprises at least two input ports. An optical signal containing n wavelengths is coupleable to one of these input ports. The receiver comprises a first demultiplexer coupled to a first input port to separate n wavelengths in the first input port onto n first multiplexer output ports, a second demultiplexer coupled to a second input port to separate the n wavelengths in the second input port onto n second multiplexer output ports, and a waveguide crossing matrix comprising an input side and an output side. The crossing matrix coupled to the n first and the n second multiplexer output ports on the input side and coupled to n shared photodetectors on the output side, one for each wavelength channel. Each of the photodetectors is coupled to one of the n first multiplexer output ports and one of the n second multiplexer output ports for the one wavelength channel.

公开(公告)号：US20240405500A1

公开(公告)日：2024-12-05

申请号：US18677411

申请日：2024-05-29

Applicant: Daryl Inniss ,  Vitaly Mikhailov

Inventor： Daryl Inniss ,  Vitaly Mikhailov

IPC: H01S3/067 ,  H01S3/091 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/23 ,  H04B10/291 ,  H04B10/294

Abstract: A system (e.g., an optical amplifier) comprising gain fibers (e.g., Bismuth-doped optical fiber) for amplifying optical signals. The optical signals have an operating center wavelength (λ0) that is centered between approximately 1260 nanometers (˜1260 nm) and ˜1360 nm (which is in the O-Band). The gain fibers are optically coupled to pump sources, with the number of pump sources being less than or equal to the number of gain fibers. The pump sources are (optionally) shared among the gain fibers, thereby providing more efficient use of resources.

公开(公告)号：US20240235714A9

公开(公告)日：2024-07-11

申请号：US18177544

申请日：2023-03-02

Applicant: II-VI Delaware, Inc.

Inventor： Shaohua CAI

IPC: H04J14/02 ,  H04B10/25 ,  H04B10/294

CPC classification number: H04J14/0201 ,  H04B10/25 ,  H04B10/294

Abstract: A reconfigurable optical add/drop multiplexer using a wavelength selective switch (WSS) component to multiplex wavelength channels into a wavelength division multiplexed (WDM) signal. When a given channel is dropped, an amplified spontaneous emission (ASE) injection signal is multiplexed as a ghost channel into the WDM signal. The ASE injection channel can mitigate polarization hole burning and can provide a fuller power spectrum density. However, the ASE injection channel also defines a monitoring window. As an optical channel monitor (OCM) monitors the WDM signal, the OCM can detect, within the monitoring window, any underlying characteristic of the given wavelength channel. In this instance in response to the detected characteristic, the WSS component switches from multiplexing the ghost channel into the WDM signal to multiplexing the given wavelength channel into the WDM signal.

公开(公告)号：US11923651B2

公开(公告)日：2024-03-05

申请号：US16887018

申请日：2020-05-29

Applicant: SUBCOM, LLC

Inventor： Dmitri G. Foursa ,  Alexei N. Pilipetskii ,  Maxim A. Bolshtyansky ,  Gregory M. Wolter

IPC: H01S3/067 ,  G02B27/10 ,  H01S3/00 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/16 ,  H01S3/23 ,  H04B10/294

CPC classification number: H01S3/06758 ,  G02B27/1006 ,  H01S3/0064 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/0941 ,  H01S3/10023 ,  H01S3/1608 ,  H01S3/2391 ,  H04B10/2941 ,  H01S2301/04

Abstract: Techniques for improving gain equalization in C- and L-band (“C+L”) erbium-doped fiber amplifier (EDFAs) are provided. For example, the C- and L-band amplification sections of a C+L EDFA may be separated and configured in a parallel arrangement or a serial arrangement. For both the parallel and serial arrangements, the C- and L-band amplification sections may share a common gain flattening filter (GFF) or each amplification section may include and employ a separate GFF. Moreover, in some examples, an “interstage” L-band GFF may be located before or upstream of the L-band amplification section such that the L-band optical signal is gain-equalized or flattened prior to the L-band amplification section amplifying the L-band.

公开(公告)号：US20230308187A1

公开(公告)日：2023-09-28

申请号：US18119213

申请日：2023-03-08

Applicant: NEC Corporation

Inventor： Morihiko Ota

IPC: H04B10/50 ,  H04B10/079 ,  H04B10/294

CPC classification number: H04B10/506 ,  H04B10/07957 ,  H04B10/294

Abstract: A length calculation unit calculates, based on a transmission time required for an optical signal transmitted from a first optical transmission apparatus to a second optical transmission apparatus through an optical transmission line to be transmitted through the optical transmission line, a length of the optical transmission line. A wavelength dispersion calculation unit calculates a wavelength dispersion per unit length of the optical transmission line based on a wavelength dispersion of the optical signal received by the second optical transmission apparatus and the length of the optical transmission line. A type determination unit determines a type of the optical transmission line based on information indicating a correspondence relationship between a value of the wavelength dispersion per unit length and the type of the optical transmission line and the calculated wavelength dispersion per unit length of the optical transmission line.

公开(公告)号：US20230308179A1

公开(公告)日：2023-09-28

申请号：US18022196

申请日：2020-08-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Rintaro HARADA ,  Shin KANEKO

IPC: H04B10/11 ,  H04B10/294

CPC classification number: H04B10/11 ,  H04B10/294

Abstract: A spatial optical communication system in which a plurality of transmitters and a plurality of receivers opposite to each of the plurality of transmitters perform an optical communication in parallel, in which the plurality of transmitters transmit optical signals of same or adjacent wavelengths to the receivers of each opposite location, and has an interference blocking unit which is disposed between the transmitter and the receiver and spatially blocks an optical signal that interferes with the receiver of a non-opposite location among optical signals transmitted from the transmitter to the receiver of an opposite location. As a result, it is possible to avoid interference with other optical communications with a reduced space and at low cost, without need to supply power.

公开(公告)号：US11770189B2

公开(公告)日：2023-09-26

申请号：US17478627

申请日：2021-09-17

Applicant: COM DEV Ltd.

Inventor： Alan Scott ,  Hugh Podmore

IPC: H04J14/02 ,  H04B10/25 ,  H04B10/294 ,  H04B10/50

CPC classification number: H04B10/25 ,  H04B10/294 ,  H04B10/506 ,  H04J14/02

Abstract: Various embodiments are disclosed herein with generally relate to an optical communication system using a photonic lantern. In at least one embodiment, the optical system comprises: an optical transmitter coupled to a signal transmitting path; an optical receiver coupled to a signal receiving path; a photonic lantern, the photonic lantern extending between a first open end and a second open end, the first end comprising an opening to a single multi-mode fiber, and the second end comprising a plurality of single mode fibers that are adiabatically coupled to the multi-mode fiber, the plurality of single-mode fibers includes a single-mode fiber adapted to carry a fundamental optical mode and the remaining single-mode fibers adapted to carry higher-order optical modes, wherein, the single-mode fiber is coupled to the optical transmitting path, the remaining single-mode fibers are coupled to the optical receiving path.

公开(公告)号：US20230261757A1

公开(公告)日：2023-08-17

申请号：US18308308

申请日：2023-04-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Zhenhua Dong ,  Xiaolong Dong ,  Chao Jin

IPC: H04B10/572 ,  H04B10/294

CPC classification number: H04B10/572 ,  H04B10/294

Abstract: This application provides a port identification method. The method includes: obtaining reflection information of reflection peaks formed by each ONT by separately reflecting test light when the test light provided by a wavelength-tunable device is transmitted in the PON; determining, based on the reflection information of the reflection peaks, a port of a splitter corresponding to each reflection peak group, where each reflection peak group includes reflection peaks formed by a same ONT by reflecting the test light; and determining, based on first transmission information of at least one reflection peak in each reflection peak group, the port of the splitter corresponding to each reflection peak group, and second transmission information between each ONT and an OLT, a port corresponding to each ONT in the splitter. According to this application, port identification efficiency can be improved.

公开(公告)号：US20230254048A1

公开(公告)日：2023-08-10

申请号：US18165668

申请日：2023-02-07

Applicant: Indian Institute of Technology Bombay

Inventor： Shalabh Gupta ,  Aboobackkar Sidhique

IPC: H04B10/80 ,  H04B10/294 ,  H04B10/61

CPC classification number: H04B10/801 ,  H04B10/294 ,  H04B10/6151

Abstract: Present disclosure provides a self-homodyne coherent (SHC) system (100) for high-speed coherent optical interconnects, the SHC (100) comprises a first transceiver (101a) and a second transceiver (101b), each of the first transceiver (101a) and one second transceiver (101b) comprises adaptive polarization controller (401), a multi-core fiber link (103) connecting first transceiver (101a) to second transceiver (101b), the first transceiver (101a) is connected to first core for forward transmission of a first signal to the second transceiver (101b), and the first transceiver (101a) is connected to second core for backward transmission of a second signal from the second transceiver (101b), and adaptive polarization controller (401) of the first transceiver (101a) and the second transceiver (101b) is configured to control a coupled optical signal polarization associated with the first signal received at second transceiver (101b) and control a coupled optical signal polarization associated with second signal received at first transceiver (101a)..