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OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals

A pulsed light, multi-wavelength technology, applied in the direction of using optical devices to transmit sensing components, can solve the problems that the measurement time is difficult to meet the needs of users, limit the application and development, and cannot guarantee the measurement, so as to avoid single-wavelength pulse saturation or signal transmission. The effect of low noise ratio, saving measurement time, and high test performance

Inactive Publication Date: 2014-05-21
INNO INSTR (CHINA) INC
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Problems solved by technology

Although the contradiction between spatial resolution and dynamic range can be partially resolved in the scheme described above, the cost is that the measurement time is greatly increased, and it is even impossible to guarantee that the measurement can be completed within a specific time
For the measurement of large dynamic range, in order to ensure the signal-to-noise ratio at the end, it takes one minute or even longer for one acquisition. If multiple acquisitions are performed, and the number of acquisitions is not limited, the measurement time will be difficult to meet user needs. Limit its application and development

Method used

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  • OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals
  • OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals
  • OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals

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Embodiment 1

[0051] Such as figure 1 As shown, an OTDR device based on a multi-wavelength pulsed optical signal is used to detect an optical fiber 5 to be tested. The OTDR device includes a data processing unit 1 , an optical transmitting unit 2 , an optical receiving unit 3 and a coupling unit 4 .

[0052] Such as figure 2 As shown, the light emitting unit 2 is used to simultaneously send a group of multi-wavelength pulsed optical signals to the optical fiber to be tested, and the light emitting unit 2 includes a light synthesis module 23 and at least two light sources 22 with different central wavelengths. The light synthesis module 23 is used for coupling the pulsed lights of different wavelengths emitted by the multiple light sources 22 . In this embodiment, the optical synthesis module 23 is a directional coupler, that is, a fiber coupler for one-way communication, but it is not limited to this, and a wavelength division multiplexer (WDM) or a planar optical waveguide (PLC) can also b...

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Abstract

The invention discloses an OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals. The device and the method are used for detecting an optical fiber to be detected. The device has the advantages that compared with a traditional OTDR, large dynamic range test can be simply realized based on the multi-wavelength pulse optical signals, different distances of the optical fiber are measured by the aid of different wavelengths, single-wavelength pulse saturation or too low signal-to-noise ratio can be avoided, measuring time is saved as compared with a multiple acquisition OTDR or a continuous acquisition OTDR, the device has larger measuring distance and resolution ratio, measurement between wavelengths is independently performed, a test device can run in different states, and multifunctional test is realized.

Description

technical field [0001] The invention belongs to the technical field of optical time domain reflectometry (OTDR), and in particular relates to an OTDR device and method based on multi-wavelength pulsed optical signals. Background technique [0002] The principle of Optical Time-Domain Reflectometry (OTDR) is: when the pulsed light is transmitted in the optical fiber, due to the properties of the optical fiber itself, connectors, joints, bending or other events, backscattering and reflection occur, the scattering And the reflected light returns to the initial end and is received by the photoelectric device. Scattered light mainly includes Rayleigh scattering caused by changes in the refractive index of optical fibers, Raman scattering caused by optical phonons, and Brillouin scattering caused by acoustic phonons. The scattered light includes information such as loss, temperature, and stress along the fiber. Using OTDR can conveniently carry out non-destructive measurement on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26
Inventor 林彦国
Owner INNO INSTR (CHINA) INC
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