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Few-mode time-domain reflectometer

A technology of time domain reflectometer and few-mode optical fiber, which is applied to electromagnetic transmitters, electrical components, electromagnetic wave transmission systems, etc., to achieve multi-scenario measurement and a wide range of applications

Inactive Publication Date: 2019-01-01
JILIN UNIV
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  • Description
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Problems solved by technology

This is not possible with current single-mode fiber time-domain reflectometers

Method used

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  • Few-mode time-domain reflectometer
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  • Few-mode time-domain reflectometer

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Embodiment 1

[0029] The present invention establishes a 6-mode few-mode time-domain reflectometer, such as Figure 6 shown. The few-mode time-domain reflectometer adopts a modular design and is composed of a signal generation module, an optical path module, a few-mode fiber module to be tested, a detection module, and a data acquisition and processing module. In this example, the signal generation module uses a single-frequency laser light source, a phase modulator (PM), an electro-optic modulator (EOM) and an FPGA signal generator to realize multi-frequency optical pulses; the optical path module uses photon lantern A, photon lantern B and few-mode The optical fiber circulator realizes mode conversion and separation; the few-mode fiber module to be tested uses a 6-mode 6km few-mode fiber for measurement; the detection module uses a photodetector to receive signals; the data acquisition and processing module uses an application developed by MFC programming The program realizes the display...

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Abstract

The invention discloses a few-mode time-domain reflectometer, and belongs to the technical field of fiber characteristic measurement. The reflectometer is composed of a signal generation module, an optical path module, a few-mode fiber module to be tested, a detection module and a data collection and processing module; the signal generation module generates a multi-frequency light pulse signal, the multi-frequency light pulse signal is input to the optical path module, a spatial mode is converted in the optical path module, the light signal after conversion is input to the few-mode fiber module to be tested, backward rayleigh scattered light of the few-mode fiber module to be tested is returned to the optical path module for mode separation, the mode separated light signal is input to thedetection module for photoelectric conversion, and the converted signals is input to the data collection and processing module to realize signal collection, processing and display. The reflectometer fills the blank in an online monitor applied to few-mode fibers, and intelligent network monitoring, damage measurement and fault location of the few-mode fibers are realized.

Description

technical field [0001] The invention belongs to the technical field of optical fiber characteristic measurement, and in particular relates to a few-mode time-domain reflectometer. Background technique [0002] In recent years, the bandwidth demand of optical fiber communication network continues to grow at a rate of 20% to 40% every year. The communication capacity of standard single-mode optical fiber is close to the nonlinear Shannon limit (100Tbit / s). According to conservative estimates, the currently laid single-mode optical fiber transmission system will reach the capacity limit in the next 10 years. Therefore, the mode multiplexing technology based on few-mode fiber has become a research hotspot. According to the prediction of OFweek.com, few-mode fiber is the next step in the development of fiber optics. Few-mode fiber communication networks will be commercially available within 5 years and become mainstream within 10 years. With the continuous development of new te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/071H04B10/54H04B10/548H04B10/524
CPCH04B10/071H04B10/524H04B10/54H04B10/548
Inventor 胡贵军李雪晴刘峰陈威成于勇宋聪聪
Owner JILIN UNIV
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