MULTICORE OPTICAL FIBER AND DESIGN METHOD

    公开(公告)号:US20220276430A1

    公开(公告)日:2022-09-01

    申请号:US17627866

    申请日:2020-07-21

    Abstract: An object of the present invention is to provide a multi-core optical fiber that can prevent an increase in bending loss even when a distance between a peripheral core and a cladding boundary is decreased, and can improve a bending loss characteristic in a state where an influence on a cutoff wavelength and a mode field diameter is small, and a design method thereof.
    The multi-core optical fiber according to the present invention is an optical fiber in which two or more core regions are arranged in a cladding region having a refractive index lower than a refractive index of the core at a minimum core interval, a ring-shaped low refractive index region surrounding the core and having a refractive index lower than the refractive index of the cladding region is provided, a bending loss after the provision of the ring-shaped low refractive index region is reduced as compared with a characteristic in a case where the ring-shaped low refractive index region is not provided, and at the same time, a change in mode field diameter after the provision of the ring-shaped low refractive index region is not changed as compared with a characteristic in a case where the ring-shaped low refractive index region is not provided.

    OPTICAL AMPLIFIER
    13.
    发明申请

    公开(公告)号:US20250141174A1

    公开(公告)日:2025-05-01

    申请号:US18836969

    申请日:2022-02-17

    Abstract: The present disclosure is an optical fiber amplifier including: an amplification optical fiber doped with a rare earth element, in which a pump light combiner for injecting multimode pump light into a cladding region of the amplification optical fiber is connected to an input end or an output end of the amplification optical fiber, and a reflective device for reflecting the pump light and transmitting signal light is connected to an end part, of the amplification optical fiber, to which the pump light combiner is not connected.

    OPTICAL TRANSMISSION SYSTEM
    15.
    发明公开

    公开(公告)号:US20240007189A1

    公开(公告)日:2024-01-04

    申请号:US18021991

    申请日:2020-08-21

    CPC classification number: H04B10/2916 H04B10/25 G02B6/02042

    Abstract: An object of the present invention is to provide an optical transmission system capable of satisfying XT required by a modulation system even if there is an inter-core loss difference in an MCF.
    An optical transmission system of the present invention includes a multi-core optical fiber having a plurality of core regions and having different losses between at least two cores, a forward excitation light source and a multiplexing unit for allowing Raman amplification excitation light to be incident on each core of the multi-core optical fiber in the same direction as signal light, and a backward excitation light source and a multiplexing unit for allowing Raman amplification excitation light to be incident on each core of the multi-core optical fiber in a direction opposite to the signal light, wherein an intensity ratio of the forward excitation light to the backward excitation light is controlled (a ratio of power of excitation light is set to a predetermined value) such that crosstalk (XT) fluctuation between cores is reduced.

    MULTI-CORE OPTICAL FIBER
    16.
    发明公开

    公开(公告)号:US20230280525A1

    公开(公告)日:2023-09-07

    申请号:US18024074

    申请日:2020-09-04

    CPC classification number: G02B6/0288 G02B6/02042

    Abstract: The present disclosure relates to a multi-core optical fiber including:
    M (where M is a positive integer of 1 or larger) group(s) each consisting of N (where N is a positive integer of 2 or larger) core regions linearly arranged in a cross section; a cladding region that surrounds the plurality of core regions and has a refractive index lower than any of the plurality of core regions; and a coating region that surrounds the cladding region, wherein the plurality of core regions are arranged in line symmetry with respect to both imaginary lines orthogonal to each other at a center of the cladding region, a diameter of the cladding region is 180 μm or less, and a diameter of the coating region is 235 μm or more and 265 μm or less.

    OPTICAL COMMUNICATION SYSTEM AND OPTICAL COMMUNICATION METHOD

    公开(公告)号:US20220294536A1

    公开(公告)日:2022-09-15

    申请号:US17634193

    申请日:2019-08-19

    Abstract: An objective of the present invention is to provide an optical communication system and an optical communication method that can reduce even a delay generated in processing of obtaining a transfer function for correcting distortion in digital coherent transmission. In the optical communication system according to the present invention, pilot data for estimating a transfer function for a transmission channel is transmitted through a transmission channel with a short transmission delay time, a transfer function of the transmission channel is estimated before receiving transmission data, and the transfer function is applied to other transmission channels.

    OPTICAL TRANSMISSION SYSTEM
    20.
    发明申请

    公开(公告)号:US20190187365A1

    公开(公告)日:2019-06-20

    申请号:US16327946

    申请日:2017-08-25

    Abstract: An optical transmission system according to the present disclosure is a mode multiplexed optical transmission system using a multi-mode optical fiber in which a plurality of propagation modes propagate as a transmission line, the optical transmission system including an optical fiber transmission line (83) that includes an optical fiber with two or more propagation modes; and a plurality of mode converters (91) that are configured to generate mode coupling between at least one pair of the propagation modes, in which a variation in an installation interval of the plurality of mode converters (91) is equal to or less than a threshold value determined by the transmission line length (Lt) of the optical fiber transmission line (83).

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