CN103595488A - Optical cable network anti-wiretap device and method - Google Patents
Optical cable network anti-wiretap device and method Download PDFInfo
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- CN103595488A CN103595488A CN201310506920.6A CN201310506920A CN103595488A CN 103595488 A CN103595488 A CN 103595488A CN 201310506920 A CN201310506920 A CN 201310506920A CN 103595488 A CN103595488 A CN 103595488A
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Abstract
The invention discloses an optical cable network anti-wiretap device and a method for optical cable network wiretap resistance by using the device. The device mainly comprises a cable vibration monitoring unit, an OTDR unit, a WDM wavelength division multiplexing unit and a reflector. Multiplexing is performed on monitoring signals of the optical cable network anti-wiretap device and communication signals of an optical communication system through the WDM wavelength division multiplexing unit, optical signals of the optical communication system and the monitoring signals are transmitted in the same optical fiber, and real-time on-line monitoring is achieved. The cable vibration monitoring unit monitors cable vibration caused by wiretap actions, and the OTDR unit monitors optical fiber loss changes caused by the wiretap actions. The two alarms generated by the cable vibration monitoring unit and the OTDR unit are combined, and therefore accuracy of alarms of the optical cable wiretap actions can be improved.
Description
Technical field
The present invention relates to method and the device of optical communication debug, specifically a kind of method of fiber cable network debug and device.
Background technology
Since there is optical fiber communication the seventies in eighties of last century, a lot of people think that optical fiber communication is a kind of communication mode of natural anti-eavesdrop, but the various listening in information technology and the network security leakage of a state or party secret that occur are in the recent period sounded the alarm again, optical cable is not the so safe, reliable of the most people imagination.Optical fiber is a kind of desirable signal transmission medium, under normal operation, the light signal leaking out from optical fiber is very little, can not be used to eavesdropping, if but by fibre-optical bending, part light signal will leak out from optical fiber, and the light signal of this part leakage just can be used to analyze, add up or eavesdropping.At present, popular " four step optical cable eavesdropping methods " is exactly: " denuding cable, curved optical fiber, the number of winning the confidence, solution information ".It has following characteristics: the one, and while stealing signal, curved fiber can cause that knee fibre loss becomes large, the 2nd, in the process of " denuding cable, curved optical fiber ", can produce vibrations to optical cable.But this eavesdropping method does not have destructiveness to telecommunication optical fiber, and as long as leaking, luminous power is not more than 1%, can not affect the normal operation of optical communication system, can not have any impact to optical communication system signal transmission quality yet, user cannot detect the existence of this eavesdropping with existing OTDR, so good concealment, detection difficulty are large.
Although common optical power monitoring method can be monitored optical signal power, change, the reason that is difficult to distinguish signal power variations is to cause because the parameter of optical communication system own changes, still because eavesdropping behavior causes.
Summary of the invention
The object of the invention is the feature for existing " four step optical cable eavesdropping methods ", and the device and method of a kind of fiber cable network debug proposing is realized optical cable eavesdropping behavior is monitored.
The technical scheme that realizes the object of the invention is:
An anti-eavesdrop device, comprising:
First, second optical communication system, for the transmission of user communication data business;
Optical cable vibration monitoring means, the optical cable vibration causing for monitoring optical cable eavesdropping activity;
OTDR unit, the fibre loss variation causing for monitoring optical cable eavesdropping activity;
First, second WDM wavelength division multiplexing unit, a branch of for the different light signal of wavelength is synthesized, along simple optical fiber transmission, at receiving terminal by the light signal of each different wave length separately;
Reflector, for controlling the reflected value of fibre circuit, guarantees that test signal has sufficient intensity, improves monitoring sensitivity;
Described the first optical communication system, optical cable vibration monitoring means and OTDR unit are connected on monitored optical cable by a WDM wavelength division multiplexing unit; Described the second optical communication system, reflector are connected on monitored optical cable by the 2nd WDM wavelength division multiplexing unit simultaneously.
Described optical cable vibration monitoring means, OTDR unit work online simultaneously, can improve system real time.
This device carries out the signal of communication of the monitor signal of fiber cable network anti-eavesdrop device and optical communication system by WDM wavelength division multiplexing unit multiplexing, and the light signal of optical communication system and monitor signal transmit in same optical fiber, realize real time on-line monitoring.
A fiber cable network debug method for fiber cable network anti-eavesdrop device, comprises the following steps:
(1) according to the signal of communication wavelength of optical communication system, select the wavelength of monitor signal, optical communication system signal of communication wavelength is 1310nm, and selecting the monitor signal wavelength of optical cable vibration monitoring unit is 1550nm, and OTDR unit monitor signal wavelength is 1625nm; Optical communication system signal of communication wavelength is 1550nm, and selecting the monitor signal wavelength of optical cable vibration monitoring unit is 1310nm, and OTDR unit monitor signal wavelength is 1625nm;
(2) optical cable vibration alarming threshold value is set, fibre circuit decay alarming threshold value is set;
(3) preserve the initial data that monitored lightguide cable link suddenlys change as calculating optical fiber attenuation in the OTDR optical fiber attenuation test curve data without in eavesdropping situation;
(4) OTDR unit carries out real-time testing to optical fiber, the optical fiber attenuation curve data obtaining carries out subtraction calculations with original OTDR fibre circuit attenuation curve data of preserving, in result of calculation, there is data sudden change, and variable quantity surpasses the threshold value of setting, think and on optical fiber, occur surpassing the bending allowing, with this, judge on monitored fibre circuit and may have eavesdropping behavior;
(5) when simultaneously, there is optical cable vibration alarm and fibre-optical bending alarm, can determine that optical cable is ravesdropping.
When optical fiber is under identical bending radius, wavelength of optical signal is longer, and bending loss is larger.In equal crooked situation, to the loss of the light signal of 1625nm wavelength, being 5 times of light signal loss of 1550nm wavelength, is 100 times to the light signal loss of 1310nm wavelength to the loss of the light signal of 1625nm wavelength.The light signal loss that the present invention utilizes long wavelength to fibre-optical bending than more sensitive characteristic, same optical fiber is being tested, in the situation that fiber bending radius is 6mm, the bending loss of optical fiber recording in 1310nm wavelength situation is less than 0.002dB, the bending loss of optical fiber recording in 1550nm wavelength situation is about 0.05dB, and the bending loss of optical fiber recording in 1625nm wavelength situation is 0.2dB.If have eavesdropping activity on this fibre circuit somewhere, in order to obtain enough light signals for eavesdropping, certainly will cause this place's optical fiber attenuation to increase, by using the OTDR unit of 1625nm wavelength to carry out real-time testing to optical fiber, the optical fiber attenuation curve data obtaining carries out subtraction calculations with original OTDR fibre circuit attenuation curve data of preserving, in result of calculation, if there is one or several data, suddenly change, and variable quantity surpasses the threshold value of setting, think and on optical fiber, occur surpassing the bending allowing, with this, judge on monitored fibre circuit and may have eavesdropping.
If utilizing merely measuring optical fiber attenuating mutation is inadequate as the monitoring means of optical cable eavesdropping, must coordinate other monitoring means to monitor lightguide cable link, determine eavesdropping behavior.
In optical cable eavesdropping behavior, " denude cable, curved optical fiber " and must exist and pull optical cable, optical fiber pipe box and the action such as peel off, these actions will certainly shake optical cable.By the vibrations of optical cable vibration monitoring means monitoring optical cable, as another one judgement optical cable, there is the foundation of eavesdropping.When above-mentioned two kinds of alarms occur simultaneously, think on monitored circuit and have eavesdropping behavior.
Advantage of the present invention is: adopt optical cable vibration monitoring means to realize vibration monitoring, have test speed faster, while there is invasion eavesdropping behavior on lightguide cable link, the vibrations that produce on lightguide cable link can be detected immediately.The monitor signal wavelength that OTDR unit adopts is 1625nm, more responsive to the bend ratio existing on monitored fibre circuit, can improve the discrimination to optical cable eavesdropping behavior.Two alarm combinations that optical cable vibration monitoring means and OTDR unit produce, can improve the accuracy of optical cable eavesdropping behavior alarm.
Accompanying drawing explanation
Fig. 1 is fiber cable network anti-eavesdrop device structural representation of the present invention.
In figure, 1. the first optical communication element 2. optical cable vibration monitoring means 3. OTDR unit 4. WDM wavelength division multiplexing unit 5. optical cables 6. the 2nd WDM wavelength division multiplexing unit 7. second optical communication element 8. reflectors.
Embodiment
Below in conjunction with drawings and Examples, content of the present invention is further described, but is not limitation of the invention.
Embodiment
With reference to Fig. 1, a kind of fiber cable network anti-eavesdrop device, comprising:
The first optical communication system 1, the second optical communication system 7, optical cable vibration monitoring means 2,3, the one WDM wavelength division multiplexing unit 4, OTDR unit, the 2nd WDM wavelength division multiplexing unit 6, reflector 8; The first optical communication system 1, optical cable vibration monitoring means 2 and OTDR unit 3 are connected on monitored optical cable 5 by a WDM wavelength division multiplexing unit 4; Described the second optical communication system 7, reflector 8 are connected on monitored optical cable 5 by the 2nd WDM wavelength division multiplexing unit 6 simultaneously.
A fiber cable network debug method for fiber cable network anti-eavesdrop device, comprises the following steps:
(1) according to the signal of communication wavelength of optical communication system, select the wavelength of monitor signal, the first optical communication system 1 and the second optical communication system 7 signal wavelengths are 1310nm, the monitor signal wavelength of optical cable vibration monitoring means 2 is 1550nm, and OTDR unit 3 monitor signal wavelength are 1625nm; The first optical communication system 1 and the second optical communication system 7 signal wavelengths are 1550nm, and the monitor signal wavelength of optical cable vibration monitoring means 2 is 1310nm, and OTDR unit 3 monitor signal wavelength are 1625nm;
(2) optical cable vibration alarming threshold value is set, fibre circuit decay alarming threshold value is set;
(3) preserve the initial data that monitored optical cable 5 circuits suddenly change as calculating optical fiber attenuation in the OTDR optical fiber attenuation test curve data without in eavesdropping situation;
(4) 3 pairs of OTDR unit optical fiber carries out real-time testing, the optical fiber attenuation curve data obtaining carries out subtraction calculations with original OTDR fibre circuit attenuation curve data of preserving, in result of calculation, there is data sudden change, and variable quantity surpasses the threshold value of setting, think and on optical fiber, occur surpassing the bending allowing, with this, judge on monitored fibre circuit and may have eavesdropping;
(5) when simultaneously, there is optical cable vibration alarm and fibre-optical bending alarm, can determine that optical cable is ravesdropping.
Claims (3)
1. a fiber cable network anti-eavesdrop device, comprises two optical communication systems, optical cable vibration monitoring means, OTDR unit, two WDM wavelength division multiplexing unit, reflector; It is characterized in that:
Described the first optical communication system, optical cable vibration monitoring means and OTDR unit are connected on monitored optical cable by a WDM wavelength division multiplexing unit; Described the second optical communication system, reflector are connected on monitored optical cable by the 2nd WDM wavelength division multiplexing unit simultaneously.
2. application rights requires a fiber cable network debug method for the fiber cable network anti-eavesdrop device described in 1, it is characterized in that, comprises the following steps:
(1), according to the signal of communication wavelength of optical communication system, select the monitor signal wavelength of optical cable vibration monitoring unit and OTDR unit;
(2) optical cable vibration alarming threshold value is set, OTDR fibre circuit decay alarming threshold value is set;
(3) preserve the initial data that monitored lightguide cable link suddenlys change as calculating optical fiber attenuation in the OTDR optical fiber attenuation test curve data without in eavesdropping situation;
(4) OTDR unit carries out real-time testing to optical fiber, the optical fiber attenuation curve data obtaining carries out subtraction calculations with original OTDR fibre circuit attenuation curve data of preserving, in result of calculation, there is data sudden change, and variable quantity surpasses the threshold value of setting, think and on optical fiber, occur surpassing the bending allowing, with this, judge on monitored fibre circuit and may have eavesdropping behavior;
(5) when simultaneously, there is optical cable vibration alarm and fibre-optical bending alarm, can determine that optical cable is ravesdropping.
3. fiber cable network debug method according to claim 2, it is characterized in that: the described optical communication system signal of communication of step (1) wavelength is 1310nm, selecting the monitor signal wavelength of optical cable vibration monitoring unit is 1550nm, and OTDR unit monitor signal wavelength is 1625nm; Optical communication system signal of communication wavelength is 1550nm, and selecting the monitor signal wavelength of optical cable vibration monitoring unit is 1310nm, and OTDR unit monitor signal wavelength is 1625nm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702222A (en) * | 2016-03-04 | 2018-10-23 | 日本电气株式会社 | Communication equipment and communication means |
| CN109150296A (en) * | 2018-11-08 | 2019-01-04 | 桂林聚联科技有限公司 | A kind of buried and pipeline laying optical cable damage alarm device and method |
| CN109302293A (en) * | 2018-11-29 | 2019-02-01 | 四川灵通电讯有限公司 | Enemy and we's recognition methods based on physical layer link |
| CN109687903A (en) * | 2018-12-28 | 2019-04-26 | 东南大学 | Optical fiber macrobending on-line monitoring system and method |
| CN113992277A (en) * | 2021-10-22 | 2022-01-28 | 安天科技集团股份有限公司 | Method, system, equipment and medium for detecting data transmission in optical signal |
| CN114884570A (en) * | 2022-06-16 | 2022-08-09 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242224A (en) * | 2008-03-06 | 2008-08-13 | 复旦大学 | An optical fiber pipe monitoring system |
| CN102684779A (en) * | 2011-03-11 | 2012-09-19 | 中国电信股份有限公司 | Centralized measurement device, failure monitoring method and system |
| CN102723990A (en) * | 2012-07-04 | 2012-10-10 | 慈溪市供电局 | Pre-alarming method and pre-alarming device of optical cable problems |
-
2013
- 2013-10-24 CN CN201310506920.6A patent/CN103595488A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242224A (en) * | 2008-03-06 | 2008-08-13 | 复旦大学 | An optical fiber pipe monitoring system |
| CN102684779A (en) * | 2011-03-11 | 2012-09-19 | 中国电信股份有限公司 | Centralized measurement device, failure monitoring method and system |
| CN102723990A (en) * | 2012-07-04 | 2012-10-10 | 慈溪市供电局 | Pre-alarming method and pre-alarming device of optical cable problems |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702222A (en) * | 2016-03-04 | 2018-10-23 | 日本电气株式会社 | Communication equipment and communication means |
| US10819690B2 (en) | 2016-03-04 | 2020-10-27 | Nec Corporation | Communication device and communication method |
| CN108702222B (en) * | 2016-03-04 | 2021-08-24 | 日本电气株式会社 | Communication apparatus and communication method |
| CN109150296A (en) * | 2018-11-08 | 2019-01-04 | 桂林聚联科技有限公司 | A kind of buried and pipeline laying optical cable damage alarm device and method |
| CN109150296B (en) * | 2018-11-08 | 2021-04-09 | 桂林聚联科技有限公司 | Damage early warning device and method for buried and pipeline laying optical cable |
| CN109302293A (en) * | 2018-11-29 | 2019-02-01 | 四川灵通电讯有限公司 | Enemy and we's recognition methods based on physical layer link |
| CN109687903A (en) * | 2018-12-28 | 2019-04-26 | 东南大学 | Optical fiber macrobending on-line monitoring system and method |
| CN109687903B (en) * | 2018-12-28 | 2021-09-28 | 东南大学 | Optical fiber macrobend on-line monitoring system and method |
| CN113992277A (en) * | 2021-10-22 | 2022-01-28 | 安天科技集团股份有限公司 | Method, system, equipment and medium for detecting data transmission in optical signal |
| CN113992277B (en) * | 2021-10-22 | 2023-09-22 | 安天科技集团股份有限公司 | Method, system, equipment and medium for detecting data transmission in optical signal |
| CN114884570A (en) * | 2022-06-16 | 2022-08-09 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
| CN114884570B (en) * | 2022-06-16 | 2024-01-19 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
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Owner name: GUILIN G-LINK TECHNOLOGY CO., LTD. Effective date: 20150730 Owner name: UNIV. OF SCIENCE AND ENGINEERING, PLA Free format text: FORMER OWNER: GUILIN G-LINK TECHNOLOGY CO., LTD. Effective date: 20150730 |
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Inventor after: Zhu Lei Inventor after: Zhou Xiaowei Inventor after: Wang Qiang Inventor after: Chen Yiwen Inventor after: Xiao Danyi Inventor after: Tong Wei Inventor before: Zhou Xiaowei Inventor before: Wang Qiang Inventor before: Chen Yiwen Inventor before: Xiao Danyi |
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Free format text: CORRECT: INVENTOR; FROM: ZHOU XIAOWEI WANG QIANG CHEN YIWEN XIAO DANYI TO: ZHU LEI ZHOU XIAOWEI WANG QIANG CHEN YIWEN XIAO DANYI TONG WEI |
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Effective date of registration: 20150730 Address after: 210007 Qinhuai Province, Nanjing District, the road after the standard Camp No. 88, No. Applicant after: Univ. of Science and Engineering, PLA Applicant after: Guilin G-Link Technology Co., Ltd. Address before: 541004 the Guangxi Zhuang Autonomous Region Guilin Qixing District, Liuhe Road, No. 98 Applicant before: Guilin G-Link Technology Co., Ltd. |
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Application publication date: 20140219 |