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An online optical time domain reflectometer structure, detection system and detection method

An optical time domain reflectometer and optical detector technology, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve the problems of shortening the maximum optical fiber distance and affecting APD detection, and achieve the improvement of dynamic range, range, and improvement. The effect of dynamic range

Active Publication Date: 2020-09-22
GUANGXUN SCI & TECH WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conventional technology will be severely degraded here, because in the EDFA system, the reverse ASE generated by the link will enter the OTDR, affecting the detection of the APD, resulting in a drop of more than 10dB in the dynamic range, and the shortening of the maximum fiber distance that the OTDR can detect

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  • An online optical time domain reflectometer structure, detection system and detection method
  • An online optical time domain reflectometer structure, detection system and detection method
  • An online optical time domain reflectometer structure, detection system and detection method

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Embodiment 1

[0057] Embodiment 1 of the present invention provides an online optical time domain reflectometer structure 1, such as figure 1 As shown, it includes a narrow linewidth pulse laser 101, a circulator 102, an optical filter 103, an optical detector 104 and a processor 105, specifically:

[0058] The light exit port of the narrow-linewidth pulsed laser 101 is connected to the first light entrance port of the circulator ( figure 1 The corresponding ports marked with 1 in the circulator 102), the second light inlet / outlet port of the circulator 102 ( figure 1 The corresponding ports marked with 2 in the circulator 102) are used to connect the external optical fiber to be tested; wherein, the central wavelength of the narrow linewidth pulse laser 101 includes 1480~1520nm and 1610~1630nm, and the 20dB of the narrow linewidth pulse The bandwidth is less than or equal to 6nm, and the narrow linewidth pulse width includes 5~20000ns (such as figure 2 shown, wherein, the width of Δλ is...

Embodiment 2

[0072] On the basis that Embodiment 1 of the present invention provides an online optical time domain reflectometer structure, this embodiment of the present invention also provides an online optical time domain reflectance detection system. This embodiment uses the An optical time domain reflectometer 100 is described, as Figure 8 As shown, it also includes a transmission optical signal 201, a wavelength division multiplexer 202, and an optical fiber network to be tested 203, wherein the optical fiber network to be tested is composed of one or more sections of optical fiber links, and each section of optical fiber links passes through a connector Connection, there may be fusion points, bends, breaks or mechanical joints in the optical fiber, specifically:

[0073] The transmission optical signal 201 is connected to the first input port of the wavelength division multiplexer 202, and the second input / output port of the wavelength division multiplexer 202 is connected to the o...

Embodiment 3

[0078] In the embodiment of the present invention, an online optical time domain reflectance detection system is also provided. Compared with the online optical time domain reflectance detector OTDR described in Embodiment 1 directly quoted in Embodiment 2, the embodiment of the present invention will The position of the optical filter in Embodiment 1 is adjusted, it is extracted from the OTDR100, and arranged between the wavelength division multiplexer 202 and the OTDR100, as Figure 9 As shown, it includes a narrow linewidth pulse laser 101, a circulator 102, an optical detector 104, a processor 105, a transmission optical signal 201, a wavelength division multiplexer 202, an optical filter 103 and an optical fiber network 203 to be tested, wherein the The optical fiber network under test includes one or more network nodes, specifically:

[0079] The transmission optical signal 201 is connected to the first input port of the wavelength division multiplexer 202, and the secon...

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Abstract

An online optical time domain reflectometer (OTDR) structure, a detection system, and a detection method. In the structure, a light outlet of a narrow-linewidth pulsed laser (101) is connected to a first light inlet (1) of a circulator (102); a second light inlet / outlet (2) of the circulator (102) is used for connecting to an external optical fiber to be detected; a third light outlet (3) of the circulator (102) is connected to an optical filter (103); the optical filter (103) is connected in series between the third light outlet (3) of the circulator (102) and an optical detector (104); a signal output port of the optical detector (104) is connected to a processor (105); the processor (105) is further connected to the narrow-linewidth pulsed laser (101) so as to provide a driving signal for the narrow-linewidth pulsed laser (101). The narrow-linewidth pulsed laser (101) and the optical filter (104) are chosen to be used together, such that only narrowband spectra in a pulsed light wavelength range can be acquired by the optical detector (104) so that the dynamic range and measuring range of the OTDR itself are improved, and furthermore most of reverse ASE in an EDFA system can be filtered so that the dynamic range during online monitoring is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of optical fiber detection, in particular to an online optical time domain reflectometer structure, detection system and detection method. 【Background technique】 [0002] Optical Time Domain Reflectometer (OTDR) is an important test instrument in optical fiber communication system. The optical transmission module of OTDR transmits the set optical pulse signal, according to the backward Fresnel reflection and Rayleigh Based on the principle of scattering, the reflected optical signal is converted by the optical receiving module (including Avalanche Photodiode (APD)), and then processed and analyzed by the signal processing unit to obtain the average loss and other parameters of the measured optical fiber. It can measure the actual length and average loss of the optical fiber in the optical fiber communication system. At the same time, it can detect, locate and measure many types of events on the optical fib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/071
CPCH04B10/071
Inventor 叶知隽熊涛余春平徐红春余振宇张建涛
Owner GUANGXUN SCI & TECH WUHAN