Few-mode fiber mode coupling measurement device based on two-photon lantern and few-mode fiber circulator

A few-mode fiber and mode coupling technology, which is applied in the field of few-mode fiber mode coupling measurement devices, can solve problems such as complex system structures

Active Publication Date: 2017-06-27
JILIN UNIV
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Problems solved by technology

However, the current mode-coupling measurement device based on Rayleigh scattering needs to use an optical isolator and an acousto-optic modulator to form an optical switch to e

Method used

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  • Few-mode fiber mode coupling measurement device based on two-photon lantern and few-mode fiber circulator
  • Few-mode fiber mode coupling measurement device based on two-photon lantern and few-mode fiber circulator
  • Few-mode fiber mode coupling measurement device based on two-photon lantern and few-mode fiber circulator

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Embodiment 1

[0039] Such as figure 2 As shown, the mode coupling coefficient and mode coupling distribution of the 3-mode fiber are measured through a few-mode fiber mode coupling measurement based on a two-photon lantern and a few-mode fiber circulator according to the present invention, and the 3-mode fiber can support LP 01 、LP 11a and LP 11b Three modes.

[0040] In this embodiment, the 3-mode optical fiber of FiberHome Communications Technology Co., Ltd. is selected as the measured optical fiber 109, the length of the measured optical fiber is about 9.8Km, the attenuation coefficient is less than 0.25dB / km in the 1550nm band, and the normalized cutoff frequency of the 1550nm band is V=3.710, can support LP 01 、LP 11a and LP 11b Three modes of transmission.

[0041] The optical pulse signal required by the embodiment is driven by the electro-optic modulator 103 under the drive of the arbitrary function generator 104, and the λ emitted by the external cavity laser 102 is 1550nm. ...

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Abstract

The invention provides a few-mode fiber mode coupling measurement device based on a two-photon lantern and a few-mode fiber circulator and belongs to the technical field of fiber characteristic measurement. The few-mode fiber mode coupling measurement device is composed of a light source, a photon lantern A, a few-mode fiber circulator, a measured fiber, a photon lantern B, a photoelectric detection module and a signal processing module. An optical pulse signal generated by the light source is subjected to spatial mode conversion through the photon lantern A to output a designated single stimulus mode, combined with the single-way transmission characteristics of the few-mode fiber circulator, the stimulus mode enters the measured fiber through the few-mode fiber circulator, a backward Rayleigh scattered light generated by coupling the stimulus mode in the measured fiber and the stimulus mode to the non-stimulus mode enters the photon lantern B through the few-mode fiber circulator for spatial model demultiplexing and being output from a corresponding mode port, and the output backward scattered light of each path is subjected to photoelectric detection and data processing, so that the measurement of the few-mode fiber mode coupling coefficient is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber characteristic measurement, in particular to a few-mode fiber mode coupling measurement device based on a two-photon lantern and a few-mode fiber circulator. Background technique [0002] With the rapid growth of global bandwidth-consuming services, the capacity of single-mode optical fiber systems approaches the Shannon limit. In order to break through the nonlinear "Shannon limit" of the single-mode optical fiber communication system capacity, Mode Division Multiplexing (MDM) technology performs mode multiplexing by mining the new spatial dimension of the mode, which greatly improves the capacity of the optical fiber communication system. . However, with the improvement of capacity and transmission rate, the tolerance of MDM system to various signal impairments decreases, which reduces the reliability of the system. Therefore, it is of great practical significance to carry out the resear...

Claims

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Application Information

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IPC IPC(8): G01M11/00
CPCG01M11/31
Inventor 胡贵军刘峰陈翠光陈威成王勃然
Owner JILIN UNIV
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