Fiber-optic time-domain reflectometer based on an extremely low-noise near-infrared single-photon detection system

A technology of time domain reflectometer and single photon detector, which is applied in optical fiber transmission, transmission system, electromagnetic wave transmission system, etc., can solve the problem of long measurement time, and achieve the effects of low cost, improved measurement speed, and reduced data distortion.

Active Publication Date: 2021-12-07
传周半导体科技(上海)有限公司
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Problems solved by technology

Since the near-infrared single-photon avalanche diode operating under the time-gated circuit is designed for applications where the photon arrival time is known, however, in OTDR-related applications, the signal photon arrival time is unknown, which makes the existing near-infrared single-photon avalanche-based The diode OTDR system can only measure a part of the fiber at a time, which causes the measurement time to be much longer than the OTDR system based on the detector under free running conditions, more than 3 times, and the longer the fiber, the more additional test time is required. long

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  • Fiber-optic time-domain reflectometer based on an extremely low-noise near-infrared single-photon detection system
  • Fiber-optic time-domain reflectometer based on an extremely low-noise near-infrared single-photon detection system
  • Fiber-optic time-domain reflectometer based on an extremely low-noise near-infrared single-photon detection system

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific examples.

[0026] figure 2 An embodiment of a fiber optic time domain reflectometer system based on an extremely low-noise near-infrared single-photon detection system is given. The system is composed of a pulse generator 201, a light source 202, a three-port optical fiber circulator 203, a transmission optical fiber 204, a three-port connected optical fiber coupler 205, a single-photon detection system 206, a signal processing module 207 and a measured optical fiber 208.

[0027] The pulse generator 201 in the system generates a pulse signal, which on the one hand triggers the signal processing module 206 to start recording time, and on the other hand makes the light source 202 emit pulsed light incident on the a port of the three-port optical fiber circulator 203, The pulsed optical signal output from the b port of the three-port optical fiber circulator 203 is incident on the optica...

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Abstract

The invention provides an optical fiber time domain reflectometer based on an extremely low-noise near-infrared single-photon detection system. It is characterized in that it consists of a pulse generator 1, a light source 2, a three-port optical fiber circulator 3, a beam splitter 4, a near-infrared single photon detector array 5, an avalanche event detection circuit array 6, a logic AND gate circuit 7, and a signal processing module 8 and the tested optical fiber 9. The invention can be used for low noise, large dynamic range and high precision optical fiber time domain reflection measurement. It can be widely used in the measurement of optical fiber characteristics such as physical defects, fracture position, splice loss and position, and optical fiber length in the field of telecommunications and sensing.

Description

(1) Technical field [0001] The present invention relates to an optical fiber time domain reflectometer system based on an extremely low-noise near-infrared single-photon detection system, which can be used in the field of telecommunications and sensing for optical fiber characteristics such as physical defects, fracture locations, joint losses and locations, and optical fiber lengths. The measurement belongs to the technical field of optical fiber sensing. (2) Background technology [0002] The fiber optic time domain reflectometer based on optical time domain reflectometry (OTDR) is a common measuring instrument, which uses the principle of back reflection and scattering of light in the fiber to detect the physical defects of the fiber without destroying the fiber , break location, splice loss and location as well as fiber length are measured. Optical fiber time domain reflectometer is an indispensable measurement tool in optical fiber communication and optical cable const...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/071H04B10/25H04B10/508
CPCH04B10/071H04B10/508H04B10/25891
Inventor 邓仕杰张文涛苑立波
Owner 传周半导体科技(上海)有限公司
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