OTDR device and method based on coded pulse optical signals

A technology for encoding pulses and optical signals, applied in the direction of using optical devices to transmit sensing components, etc., can solve problems such as higher signal quality requirements, increased dynamic range, and measurement distances that are not as good as large pulse measurement distances, to enrich test functions, improve performance effect

Inactive Publication Date: 2014-09-17
INNO INSTR (CHINA) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the additional noise brought by pulse coding, the dynamic range obtained by increasing the code length is lower than that obtained by increasing the pulse width, and the measurement distance is often not as good as the measurement distance of large pulses.
In addition, the correlation algorithm requires high signal quality. If the signal-to-noise ratio is low, or the signal is saturated in the optical path, the result will be distorted or the effect will be deteriorated.

Method used

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  • OTDR device and method based on coded pulse optical signals
  • OTDR device and method based on coded pulse optical signals
  • OTDR device and method based on coded pulse optical signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Such as figure 1 As shown, an OTDR device based on a coded pulsed optical signal is used to detect an event occurring on an optical fiber 5 to be tested, and the OTDR device includes a light emitting unit 2, a light receiving unit 3, a main control unit 1 and a coupling unit 4. The main control unit 1 is connected to the light emitting unit 2 and the light receiving unit 3 respectively.

[0060] Such as figure 2 As shown, the light transmitting unit 2 is used to sequentially transmit multiple groups of different types of coded pulsed light signals into the optical fiber 5 to be tested; the coded pulsed light signal refers to the pulsed light signal containing a pseudo-random sequence code. The light emitting unit 2 includes a light source 22 and a code generating module 21. The code generating module 21 is used to generate a driving code, which may be Gray code, and the driving code drives the light source 22 to emit a corresponding coded pulse light signal.

[0061...

Embodiment 2

[0115] Such as image 3 As shown, regarding the OTDR device based on the coded pulsed optical signal, the difference between this embodiment and Embodiment 1 is:

[0116] The light receiving unit 3 includes a light splitting module 35 and three light detection modules 31 , the light splitting module 35 divides the backscatter signal into three scattering sub-signals of different wavelength bands, and inputs the scattering sub-signals to the corresponding light detection modules 31 respectively. Wherein, the optical splitting module 35 is an optical splitter.

[0117] In this embodiment, the light receiving unit 3 also includes three groups of sequentially connected amplification modules 32, filter modules 33 and analog-to-digital conversion modules 34; Conversion module 34.

[0118] Similar to Embodiment 1, in this embodiment, a set of optical detection module 31, amplification module 32, filter module 33 and analog-to-digital conversion module 34 can be regarded as one opti...

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Abstract

The invention discloses an OTDR device and method based on coded pulse optical signals. The OTDR device and method are used for detecting an optical fiber to be detected. The OTDR device comprises a light emitting unit, a light receiving unit, a master control unit and a coupling unit. The master control unit respectively controls the light emitting unit and the light receiving unit. The light emitting unit is used for sending the coded pulse optical signals to the optical fiber to be detected. The light receiving unit is used for receiving backscattering signals from the optical fiber to be detected. The OTDR device and method have the advantages that multiple sets of encoded pulses are utilized, high-resolution encoding can be carried out on the near-distance optical fiber, large-dynamic-range encoding is carried out on the long-distance optical fiber, different coded pulses are used for events at different distances for test analysis, and therefore the optimal effect of the measurement on the events at all distances can be achieved, and the relevant OTDR performance is comprehensively improved.

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 coded pulsed optical signals. Background technique [0002] Optical Time-Domain Reflectometry (OTDR) is an instrument for measuring optical fiber transmission characteristics through backscattering and reflection signals. The backscattering signal generated when light is transmitted in the optical fiber contains a lot of information. Because the OTDR measurement method is simple and practical, it is widely used in the construction and maintenance of the optical fiber communication field. With the development of optical fiber sensing technology, OTDR There are more and more applications in this field. [0003] As the relay distance of optical fiber communication continues to increase, the requirements for the dynamic range of OTDR are also increasing. The dynamic range is usually defined as the dB di...

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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