CN101594181A - Optical fiber interception device and intercepting method thereof - Google Patents
Optical fiber interception device and intercepting method thereof Download PDFInfo
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- CN101594181A CN101594181A CNA2009100542184A CN200910054218A CN101594181A CN 101594181 A CN101594181 A CN 101594181A CN A2009100542184 A CNA2009100542184 A CN A2009100542184A CN 200910054218 A CN200910054218 A CN 200910054218A CN 101594181 A CN101594181 A CN 101594181A
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Abstract
The present invention relates to a kind of optical fiber interception device, this device comprise the light signal pick device and with the supporting light signal processing module of light signal pick device, described light signal pick device comprise the coupling slot that is provided with matching fluid and part crooked be contained in telecommunication optical fiber and coupled fiber in the coupling slot, the sweep of telecommunication optical fiber and coupled fiber contacts; The multipole amplifying circuit that described light signal processing module comprises detector and links to each other with detector.Light signal pick device of the present invention can be collected the leakage light that fibre-optical bending produces fully, and the signal in the coupled fiber is through light-to-current inversion, processing and amplifying, intactly recovering signal.Adopt this mode to pick up easy, the easy row and reliable of side leakage light method, device volume is little, easy to operate.
Description
Technical field
The present invention relates to a kind of loss characteristic of utilizing optical fiber realizes the equipment of intercepting to optical cable in particular, relating to a kind of new optical fiber interception device and intercepting method thereof technically.
Background technology
The loss characteristic of optical fiber is one of greatest factor of decision optical-fiber network transmission range, transmission stability and reliability.The generation reason of fiber transmission attenuation is many-sided, in the construction and maintenance of Networks of Fiber Communications, it is worth noting that optical fiber causes the reason of loss and how to reduce these losses in using most.The loss that optical fiber causes in using mainly contains connecting loss (inherent loss of optical fiber, splice loss, splice attenuation and active joint loss) and non-connecting loss (loss that bending loss and other construction factor and applied environment are caused) two classes.
The radiation loss that bending causes is worked as optical fiber and is subjected to very big bending, and when bending radius and its core diameter had comparativity, its transmission characteristic can change.A large amount of guided modeses are converted to radiation mode, no longer continue transmission, but enter coated layer of covering or covering absorption, thereby cause the supplementary load loss of optical fiber.The bending loss of optical fiber has two types of macrobend loss and microbend losss.
Fiber bending radius is too small, and transmission mode can be destroyed, produces bending loss, has part side leakage light to leak from optical fiber.Utilize above-mentioned characteristic can realize technically can realizing eavesdropping on this basis to the other types optical cable to the intercepting of optical cable.But, be a difficult problem for collection, the reduction of the side leakage light that fibre-optical bending produced.Can realize with highly-sensitive detector and accurate localization system in theory.Find that in experiment such system operation difficulty of getting up is very big, use inconvenience and cost height.
Given this, in order to overcome the above problems, optical fiber interception device a kind of simple in structure, cheap and intercepting method thereof are proposed now.
Summary of the invention
It is a kind of simple in structure that the technical problem to be solved in the present invention is to provide, and cheap optical fiber interception device utilizes bending loss, detects its side leakage light and recovering signal, on the basis of not destroying optical fiber structure, reaches the purpose of picking up of signal.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of optical fiber interception device, this device comprise the light signal pick device and with the supporting light signal processing module of light signal pick device, described light signal pick device comprise the coupling slot that is provided with matching fluid and part crooked be contained in telecommunication optical fiber and coupled fiber in the coupling slot, the sweep of telecommunication optical fiber and coupled fiber contacts; The multipole amplifying circuit that described light signal processing module comprises detector and links to each other with detector.
As one of preferred version of the present invention, described matching fluid is a kind of in glycerine, carbon tetrachloride or the liquid paraffin.
As one of preferred version of the present invention, described multipole amplifying circuit comprises preamplifier, main amplifier, the secondary amplifying unit that links to each other successively and amplifies output unit.
As one of preferred version of the present invention, this device further comprises a RC filter circuit that is connected with the amplification output unit, is used to suppress noise.
The present invention also comprises a kind of optical fiber interception method, and this method may further comprise the steps,
Crooked the placing in the coupling slot of a part with telecommunication optical fiber is preset with matching fluid in the described coupling slot;
With crooked also the placing in the coupling slot of a part of coupled fiber, the sweep of coupled fiber and telecommunication optical fiber contacts;
Detector in the light signal processing module detects the side leakage light that coupled fiber passes over, in the multipole amplifying circuit of input after the light-to-current inversion;
The complete recovering signal of multipole amplifying circuit output.
As one of preferred version of the present invention, this method further may further comprise the steps,
Multipole amplification circuit output end is provided with the RC filter circuit, and multipole amplifying circuit is realized noise suppressed by the RC filter circuit after exporting complete recovering signal.
Optical fiber interception device of the present invention and method can be collected the leakage light that fibre-optical bending produces fully, and the signal in the coupled fiber is through light-to-current inversion, processing and amplifying, intactly recovering signal.Adopt this mode to pick up easy, the easy row and reliable of side leakage light method, device volume is little, easy to operate.
Description of drawings
Fig. 1 is an optical fiber interception device structural representation of the present invention;
Fig. 2 is light signal processing module schematic block circuit diagram in the optical fiber interception device of the present invention;
Fig. 3 is light signal pick device structural representation in the optical fiber interception device of the present invention.
The main element symbol description
Telecommunication optical fiber 1 coupled fiber 2
Preamplifier 6 main amplifiers 7
Secondary amplifying unit 8 amplifies output unit 9
Embodiment
Further specify concrete implementation step of the present invention below in conjunction with accompanying drawing.
A kind of optical fiber interception device, this device comprise the light signal pick device and with the supporting light signal processing module of light signal pick device, described light signal pick device comprise the coupling slot 3 that is provided with matching fluid 31 and part crooked be contained in telecommunication optical fiber 1 and coupled fiber 2 in the coupling slot 3, telecommunication optical fiber 1 contacts with the sweep of coupled fiber 2; Described light signal processing module comprises detector 4 and the multipole amplifying circuit 5 that links to each other with detector 4.Described matching fluid 31 is a kind of in glycerine, carbon tetrachloride or the liquid paraffin.Its refractive index is 1.457.
Described multipole amplifying circuit 5 comprises preamplifier 6, main amplifier 7, the secondary amplifying unit 8 that links to each other successively and amplifies output unit 9.This device further comprises a RC filter circuit that is connected with the amplification output unit, is used to suppress noise.
The present invention also comprises a kind of optical fiber interception method, and crooked the placing in the coupling slot of a part with telecommunication optical fiber is preset with matching fluid in the described coupling slot; With crooked also the placing in the coupling slot of a part of coupled fiber, the sweep of coupled fiber and telecommunication optical fiber contacts; Detector in the light signal processing module detects the side leakage light that coupled fiber passes over, in the multipole amplifying circuit of input after the light-to-current inversion; The complete recovering signal of multipole amplifying circuit output; Multipole amplification circuit output end is provided with the RC filter circuit, and multipole amplifying circuit is realized noise suppressed by the RC filter circuit after exporting complete recovering signal.
Under the effect of index-matching fluid, the part light leak is coupled into coupled fiber, sends into highly-sensitive detector again by coupled fiber and detects, and the reduction signal of telecommunication is behind the decrypted signal, again through amplifying, handle the information that just can decode wherein.
From optical fiber, deliver to the processing of circuit part by the light signal that pick device is collected,, just obtain raw electrical signal in the signal optical fibre, can decode as required, decoding, record, therefrom find out useful information through processing of circuit.
The side leakage light that is produced by bending loss is under the effect of index-matching fluid, be coupled to coupled fiber earlier, sending into highly-sensitive detector by optical fiber detects, carry out light-to-current inversion, amplify through low-noise preamplifier, amplify through main amplifier, two-stage amplifier again, at last through amplifying the output recovering signal.We can design different circuit as required, export various fiduciary levels, are beneficial to analysis and research.Can add noise suppression circuit as required, prevent the interference of noise signal.
Experimental results show that such pick device can collect the leakage light that fibre-optical bending produces fully, because communication system all leaves certain surplus, such loss that device produced is minimum, do not influence original communication, and conventional instrument such as OTDR almost can't find the monitor value variation that this attachment device brings, signal in the coupled fiber is through light-to-current inversion, processing and amplifying, intactly recovering signal.Adopt this mode to pick up easy, the easy row and reliable of side leakage light method, device volume is little, easy to operate.
The foregoing description is the unrestricted technical scheme of the present invention in order to explanation only.Any technical scheme that does not break away from spirit and scope of the invention all should be encompassed in the middle of the patent claim of the present invention.
Claims (7)
1. optical fiber interception device, it is characterized in that: this device comprise the light signal pick device and with the supporting light signal processing module of light signal pick device, described light signal pick device comprise the coupling slot (3) that is provided with matching fluid (31) and part crooked be contained in telecommunication optical fiber (1) and coupled fiber (2) in the coupling slot (3), telecommunication optical fiber (1) contacts with the sweep of coupled fiber (2); Described light signal processing module comprises detector (4) and the multipole amplifying circuit (5) that links to each other with detector (4).
2. optical fiber interception device as claimed in claim 1 is characterized in that: a kind of in glycerine, carbon tetrachloride or the liquid paraffin of described matching fluid (31).
3. optical fiber interception device as claimed in claim 1 is characterized in that: described multipole amplifying circuit (5) comprises preamplifier (6), main amplifier (7), the secondary amplifying unit (8) that links to each other successively and amplifies output unit (9).
4. optical fiber interception device as claimed in claim 1 is characterized in that: this device further comprises a RC filter circuit that is connected with the amplification output unit, is used to suppress noise.
5. optical fiber interception device as claimed in claim 1 is characterized in that: the refractive index of described matching fluid (31) is 1.457.
6. method of utilizing the described optical fiber interception device of claim 1 to intercept, it is characterized in that: this method may further comprise the steps,
1) with crooked the placing in the coupling slot of a part of telecommunication optical fiber (1), is preset with matching fluid in the described coupling slot;
2) with crooked also the placing in the coupling slot of a part of coupled fiber (2), coupled fiber (2) contacts with the sweep of telecommunication optical fiber (1);
3) detector in the light signal processing module detects the side leakage light that coupled fiber passes over, in the multipole amplifying circuit of input after the light-to-current inversion;
4) the complete recovering signal of multipole amplifying circuit output.
7. the method that optical fiber interception device as claimed in claim 6 is intercepted is characterized in that: this method further may further comprise the steps,
5) multipole amplification circuit output end is provided with the RC filter circuit, and multipole amplifying circuit is realized noise suppressed by the RC filter circuit after exporting complete recovering signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100542184A CN101594181A (en) | 2009-06-30 | 2009-06-30 | Optical fiber interception device and intercepting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100542184A CN101594181A (en) | 2009-06-30 | 2009-06-30 | Optical fiber interception device and intercepting method thereof |
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| CN101594181A true CN101594181A (en) | 2009-12-02 |
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| CNA2009100542184A Pending CN101594181A (en) | 2009-06-30 | 2009-06-30 | Optical fiber interception device and intercepting method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404540A (en) * | 2021-06-11 | 2021-09-17 | 安徽中科昊音智能科技有限公司 | Voiceprint comprehensive monitoring system applied to coal mine scene |
| CN114614889A (en) * | 2020-12-09 | 2022-06-10 | 中国移动通信集团四川有限公司 | Method and device for detecting using state of optical fiber and electronic equipment |
-
2009
- 2009-06-30 CN CNA2009100542184A patent/CN101594181A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614889A (en) * | 2020-12-09 | 2022-06-10 | 中国移动通信集团四川有限公司 | Method and device for detecting using state of optical fiber and electronic equipment |
| CN113404540A (en) * | 2021-06-11 | 2021-09-17 | 安徽中科昊音智能科技有限公司 | Voiceprint comprehensive monitoring system applied to coal mine scene |
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Application publication date: 20091202 |