CN109004991A - A kind of anti-intercepting and capturing FSO- optical fiber hybrid network - Google Patents
A kind of anti-intercepting and capturing FSO- optical fiber hybrid network Download PDFInfo
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- CN109004991A CN109004991A CN201810867450.9A CN201810867450A CN109004991A CN 109004991 A CN109004991 A CN 109004991A CN 201810867450 A CN201810867450 A CN 201810867450A CN 109004991 A CN109004991 A CN 109004991A
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- optical
- fso
- optical fiber
- intercepting
- capturing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
Abstract
The present invention relates to a kind of anti-intercepting and capturing FSO- optical fiber hybrid networks, comprising: transmitting terminal, the data information for sending user are input to combiner after ovennodulation, pumped FIR laser；Combiner, the multichannel user data information for receiving are coupled into optical signal all the way, and emitted lens are transmitted into FSO link；Coupled lens are transferred to receiving end through optical fiber after the optical signal of atmospheric attenuation and atmospheric turbulance coupling in FSO link for receiving；End subscriber is received, for received optical signal to be carried out matching and decoding, APD receiver receives, and recovers original user data after filtering and decision circuit；End is eavesdropped, for stealing the data information for sending end subscriber in FSO link or optical fiber link, the light address code of user can not be known, using non-matching optical decoder, can not restore to send end subscriber primary data information (pdi).The security risk of optical-fiber network can effectively be overcome.
Description
Technical field
The invention belongs to light Network Communication technological improvement fields, more particularly to one kind to be based on physical layer pumped FIR laser anti-intercepting and capturing FSO-
Optical fiber hybrid network.
Background technique
In current Internet information age, information technology constantly improves daily life, and pushes society
The progress of meeting.Bandwidth, transmission capacity are big, many uniquenesses such as small, strong antijamming capability are lost because it has for optical fiber telecommunications system
The advantages of, universal application, information security issue present in fibre-optic transmission system (FOTS) have been obtained in business and military communication field
It is resolved also by traditional algorithm for encryption, quantum key distribution and encryption in physical layer mode, but optical fiber telecommunications system
There are still deficiencies, firstly, fiber optic communication can only meet the communication network on ground；Secondly, optical fiber installation is expensive, and due to ground
It is excessively high to manage difficult to install and cost, some areas are unable to deployed fiber.
Free space optical communication (Free Space Optical Communication, FSO) technology is based on radio
Communication and Fibre Optical Communication Technology, the technology of high-rate information transmission is directly carried out using laser beam in atmosphere or outer space.Nothing
Linear light communication is directly to transmit a kind of communication mode of optical information in an atmosphere, that is, utilize laser using laser beam as carrier wave
Shu Zuowei channel directly carries out a kind of technology of the information bidirectionals such as voice, data, image transmission in space.Since its is at low cost,
Bandwidth rich, flexibility are high, dispose the features such as rapid, and FSO technology is considered as supplementing the effective means of Conventional optical communication, can be with
Make up deficiency present in optical fiber telecommunications system.
In FSO- optical fiber hybrid network, the optical signal of FSO link transmission be may be coupled directly in fiber cores, not needed
Electric light or photoelectric conversion process do not need expensive electric light and photoelectricity, it can be achieved that the up to data rate of 1Tb/s or more
Converter is a kind of steady low-cost technologies, can be remote cities and towns, and village and geographical conditions are difficult to only reach by optical fiber
User high speed and highly safe access service are provided.Therefore FSO- optical fiber hybrid network comes into being, and quickly by big
The concern of family.
FSO- optical fiber hybrid network has many advantages, such as that high speed, low cost, deployment are simple, can be applied to local area network, last
One kilometer of access and Incorporate information network etc..Incorporate information network, it is by satellite, aircraft, dirigible
And link chain ground plane, sea, aerial and the user in deep space, aircraft and various communications platforms between earth station, it uses
Intelligent high-speed processing, exchange and route technology accurately obtain, quickly the integration high speed broadband of processing and high efficiency of transmission information is believed
Cease network, i.e. space-based, space base and continental rise integrated synthesis information network.Link between intersatellite link, satellite-earth station, ship
Deng FSO link all can be used, and optical fiber link is used between earth station.Incorporate information network is strategic with its, basic
Property, drive property and irreplaceability significance, by the great attention of world many countries.
Research now concerning mixing FSO- optical fiber is concentrated mainly on its bit error rate performance, however Incorporate information
Network is a kind of distributed frame of high opening wireless mode, thus be easy eavesdropped, invaded, network attack and refusal clothes
The security threats such as business, and the secrecy that its transmission needs to need higher level with confidentiality, especially national defence net, therefore how
The confidentiality of raising system and safety are one of technological difficulties.Traditional optical-fiber network safety uses the number of upper network layer agreement
According to encryption, and assume that unimpeded and zero defect transmission has been provided in physical layer.But with the development of science and technology, all to be based on
What the cryptographic means of algorithm all had proven to can to crack, be no longer satisfied the demand of information security.
OCDMA technology is in traditional electric CDMA (Code Division Multiple Access, CDMA) technology base
The wireless communication technique proposed on plinth, with multiple-protection-function, it can be achieved that the safe transmission of optical information.When being primarily based on
The spread spectrum mechanism and security system of frequency-domain transform, make it have the function of stronger anti-intercepting and capturing；Secondly it can be encoded using frequency hopping
Or the measures such as code word reconstruct, the influence of invasion optical signal is effectively avoided, safeguards system operates normally, to have attack resistance energy
Power, it is ensured that the safety of information communication；A unique area of light address code is assigned to each user, unauthorized user cannot be got
The signal of transmitted other users in system, it is ensured that user can only receive the signal of itself, by dynamic reconfigurable address code, be
System can confirm the identity of each user at any time, it is ensured that the credible delivery of information；Characteristic when finally being expanded using its spread spectrum, can be by institute
The signal of transmission becomes noise like, hides in normal transmissions system, or even concealment is in ambient noise.Existing a large amount of analysis cards
The safety of optical fiber telecommunications system can be improved in bright OCDMA technology.
Some FSO- optical fiber hybrid networks consider the error free transmission of link mostly, study different turbulent-flow conditions, inhomogeneity
The influence of type optical fiber, different reception modes to bit error rate performance, and consider to enhance system by multiple aperture receiver system
Performance.For example, the experimental optical-fiber network of free space that U.S. DARPA was once initiated tests (FOENEX) and Changchun University of Science and Technology
The laser communication experiment of the multilink of development, including ship-ground, ship-ship, dirigible-ship, aircraft-interplane dynamic
Laser communication.Meanwhile current unified key management technology, Secure Routing Techniques, handoff-security technology etc. all cannot be guaranteed be
It unites absolute safety.
Summary of the invention
The purpose of the present invention is to provide a kind of anti-intercepting and capturing FSO- optical fiber hybrid networks, it is intended to solve above-mentioned technology and ask
Topic.
The invention is realized in this way a kind of anti-intercepting and capturing FSO- optical fiber hybrid network, the anti-intercepting and capturing FSO- fiber mix
Network includes:
Transmitting terminal, the data information for sending user are input to combiner after ovennodulation, pumped FIR laser；
Combiner, the multichannel user data information for will receive are coupled into optical signal all the way, emitted lens
It is transmitted into FSO link；
Coupled lens pass after the optical signal of atmospheric attenuation and atmospheric turbulance coupling in FSO link through optical fiber for receiving
It is defeated by receiving end；
Receiving end, for received optical signal to be carried out matching and decoding, APD (avalanche photodide) receiver receives,
By filtering and recovering original user data after decision circuit；
End is eavesdropped, for stealing the data information for sending end subscriber in FSO link or optical fiber link, cannot accurately be known
The light address code of user can not be restored to send end subscriber primary data information (pdi) using non-matching optical decoder.
A further technical solution of the present invention is: the transmitting terminal includes:
Data generation module will need the information sent to generate user data information and is sent to modulator for user；
Light source is sent to modulator for generating optical signal；
Modulator is sent on carrier wave to optical signal for receiving the light wave of light source generation and modulating user data information
To encoder；
Optical encoder generates optical coding signal output for modulated user data information to be carried out pumped FIR laser.
A further technical solution of the present invention is: the receiving end includes
Optical decoder is matched, for the optical coding signal received to be carried out matching and decoding and is exported；
APD, for receiving the decoded optical signal of matching and decoding device and exporting；
Filter is filtered it for receiving the optical signal from APD；
Decision circuit, the judgement for decision threshold to be arranged, to signal progress data " 0 " and " 1 " is received；
Data recovery module, the data information for sending user carry out original reduction.
A further technical solution of the present invention is: the eavesdropping end includes tapping channel, non-matching decoder and receiver,
The output end of the tapping channel connects the non-matching decoded input terminal, and the output end of the non-matching decoder connects institute
State the input terminal of receiver.
A further technical solution of the present invention is: the modulator will have the mode of signal output " 1 " no signal output " 0 "
It is modulated demodulation.
A further technical solution of the present invention is: the address code of the optical encoder is light orthogonal code or other smooth addresses
Code, coding mode are two-dimensional encoded one-dimensional coding or relevant coding or incoherent coding.
A further technical solution of the present invention is: the optical encoder is using fiber delay line or fiber grating or liquid
Brilliant or AWG or PLC.
A further technical solution of the present invention is: the reception optical signal coupling device utilizes coupled lens by spatial beam coupling
It closes in optical fiber, the optical coupling efficiency is fluctuated with the fluctuation of atmospheric turbulance.
The beneficial effects of the present invention are: overcoming the security risk in optical-fiber network there are listener-in.Particularly suitable local area network,
The safe transmission of net, Incorporate information network is accessed, there is the urgent market demand and broad prospect of application.
Detailed description of the invention
Fig. 1 is the block diagram of base anti-intercepting and capturing FSO- optical fiber hybrid network provided in an embodiment of the present invention.
Fig. 2 is transmitting terminal block diagram provided in an embodiment of the present invention.
Fig. 3 is receiving end block diagram provided in an embodiment of the present invention.
Fig. 4 is optical encoder structural schematic diagram provided in an embodiment of the present invention
Fig. 5 is coupling principle figure of the spatial light provided in an embodiment of the present invention to optical fiber.
Fig. 6 is tapping channel model schematic provided in an embodiment of the present invention.
Specific embodiment
As shown in Figure 1, anti-intercepting and capturing FSO- optical fiber hybrid network provided by the invention, the anti-intercepting and capturing FSO- fiber mix net
Network includes:
Transmitting terminal, the data information for sending user are input to combiner after ovennodulation, pumped FIR laser；
Combiner, the multichannel user data information for will receive are coupled into optical signal all the way, emitted lens
It is transmitted into FSO link；
Coupled lens pass after the optical signal of atmospheric attenuation and atmospheric turbulance coupling in FSO link through optical fiber for receiving
It is defeated by receiving end；
Receiving end, for received optical signal to be carried out matching and decoding, APD receiver receives, by filtering and adjudicating electricity
Original user data is recovered behind road；
End is eavesdropped, for stealing the data information for sending end subscriber in FSO link or optical fiber link, cannot accurately be known
The light address code of user can not be restored to send end subscriber primary data information (pdi) using non-matching optical decoder.
The transmitting terminal includes:
Data generation module will need the information sent to generate user data information and is sent to modulator for user；
Light source is sent to modulator for generating optical signal；
Modulator is sent on carrier wave to optical signal for receiving the light wave of light source generation and modulating user data information
To encoder；
Optical encoder generates optical coding signal output for modulated user data information to be carried out pumped FIR laser.
The receiving end includes
Optical decoder is matched, for the optical coding signal received to be carried out matching and decoding and is exported；
APD, for receiving the decoded optical signal of matching and decoding device and exporting；
Filter is filtered it for receiving the optical signal from APD；
Decision circuit, the judgement for decision threshold to be arranged, to signal progress data " 0 " and " 1 " is received；
Data recovery module, the data information for sending user carry out original reduction.
The eavesdropping end includes tapping channel, non-matching decoder and receiver, the output end connection of the tapping channel
The output end of the non-matching decoded input terminal, the non-matching decoder connects the input terminal of the receiver.
The modulator will have the mode of signal output " 1 " no signal output " 0 " to be modulated demodulation.
The address code of the optical encoder is light orthogonal code or other smooth address codes, and coding mode is one-dimensional coding or two dimension
Coding or relevant coding or incoherent coding.
The optical encoder is using fiber delay line or fiber grating or liquid crystal or AWG or PLC.
Spatial beam is coupled in optical fiber by the reception optical signal coupling device using coupled lens, the fiber coupling effect
Rate is fluctuated with the fluctuation of atmospheric turbulance.
As shown in Figure 1, the anti-intercepting and capturing FSO- optical fiber hybrid network block diagram that the application proposes, in transmitting terminal, as shown in Fig. 2,
User data is modulated on optical signal first, here using OOK modulation system, that is, has signal to export " 1 ", no signal output
" 0 ", then encodes using optical encoder, and finally propagation in atmosphere is passed through in combining.There are atmospheric attenuation and atmosphere are rapid in FSO link
Stream, causes the decaying and random fluctuation of optical signal, then optical signal coupled into optical fibres continues to transmit, while bias light can also couple
Entering light is fine, forms ambient noise in receiving end.After the transmission of FSO link and optical fiber link, optical signal reaches receiving end, such as
Shown in Fig. 3, matching photodissociation code is carried out, is received by APD (avalanche photodide) receiver, then successively through wave filter and judgement
Circuit recovers original user data.Listener-in cannot accurately know the light address code of user, can only use non-matching
Optical decoder, thus can not correct restoring user data, to ensure that the safety of physical layer of network.
The optical encoder and decoder that the application mentions here using being the most common fibre delay line, and use
Address code be one-dimensional light orthogonal code.Temporal amplitude is encoded, exactly the light pulse modulated is delayed respectively is to code word
" 1 " corresponding different time-gap.For optical decoder, the delay time of fibre delay line is arranged according to optical encoder, that is, is protected
The delay time of the delay time and optical encoder of demonstrate,proving optical decoder add up to 1ns, that is, a bit period (assuming that user
Data rate 1Gb/s).The structural schematic diagram of optical encoder and optical decoder, as shown in Figure 4.
Coupled into optical fibres is wanted by the optical signal that atmospheric channel transmits, but due to the influence of atmospheric turbulance, is coupled to optical fiber
In be the optical signal being distorted after atmosphere so that Single-Mode Fiber Coupling efficiency degradation.Fig. 5 is saturating using coupling
Mirror is by space optical coupling into optical fiber, but optical coupling efficiency can be fluctuated with the fluctuation of atmospheric turbulance.
Due to the maturation of the optical fiber such as the opening of FSO link and fibre-optical bending method eavesdropping means, FSO- optical fiber hybrid network
In the presence of the security risk being ravesdropping, listener-in can eavesdrop respectively in FSO link and optical fiber link, it is also possible to exist and cooperate with each other
More listener-ins.Tapping channel model includes information source, codec, legitimate user, listener-in, as shown in Figure 6.
Listener-in cannot accurately know the light address code of user, without matched optical decoder, just can not correctly restore
User data, but listener-in can be listened to using modes such as brute-force search, code word interception, energy measurings.As shown in Figure 1, this is specially
Benefit enhances safety of physical layer by the way of increasing interference user, can prevent listener-in from stealing by way of energy measuring
Information, if hypothesis user 1 is target user, other users can be used as interference user, reduce the signal-to-noise ratio of listener-in, thus plus
The eavesdropping difficulty of big listener-in.
It is modulated it should be noted that the modulation system that this patent is mentioned is not limited to OOK, but any modulation system,
Coding mode is not also unique simultaneously, can be one-dimensional coding, two-dimensional encoded, is also possible to relevant coding, incoherent coding, specifically
Realization can use fiber delay line, fiber grating, liquid crystal, AWG, PLC etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of anti-intercepting and capturing FSO- optical fiber hybrid network, which is characterized in that the anti-intercepting and capturing FSO- optical fiber hybrid network includes:
Transmitting terminal, the data information for sending user are input to combiner after ovennodulation, pumped FIR laser；
Combiner, the multichannel user data information for will receive are coupled into optical signal all the way, and emitted lens are sent
Into in FSO link；
Coupled lens are transferred to after the optical signal of atmospheric attenuation and atmospheric turbulance coupling in FSO link through optical fiber for receiving
Receiving end；
Receiving end, for received optical signal to be carried out matching and decoding, APD receiver receives, after filtering and decision circuit
Recover original user data；
End is eavesdropped, for stealing the data information for sending end subscriber in FSO link or optical fiber link, cannot accurately know user
Light address code can not restore to send end subscriber primary data information (pdi) using non-matching optical decoder.
2. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 1, which is characterized in that the transmitting terminal includes:
Data generation module will need the information sent to generate user data information and is sent to modulator for user；
Light source is sent to modulator for generating optical signal；
Modulator is sent to volume on carrier wave to optical signal for receiving the light wave of light source generation and modulating user data information
Code device；
Optical encoder generates optical coding signal output for modulated user data information to be carried out pumped FIR laser.
3. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 2, which is characterized in that the receiving end includes
Optical decoder is matched, for the optical coding signal received to be carried out matching and decoding and is exported；
APD, for receiving the decoded optical signal of matching and decoding device and exporting；
Filter is filtered it for receiving the optical signal from APD；
Decision circuit, the judgement for decision threshold to be arranged, to signal progress data " 0 " and " 1 " is received；
Data recovery module, the data information for sending user carry out original reduction.
4. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 3, which is characterized in that the eavesdropping end includes eavesdropping
Channel, non-matching decoder and receiver, the output end of the tapping channel connects the non-matching decoded input terminal, described
The output end of non-matching decoder connects the input terminal of the receiver.
5. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 4, which is characterized in that the modulator will have signal
The mode of output " 1 " no signal output " 0 " is modulated demodulation.
6. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 5, which is characterized in that the address of the optical encoder
Code is light orthogonal code or other smooth address codes, and coding mode is two-dimensional encoded one-dimensional coding or relevant coding or incoherent volume
Code.
7. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 6, which is characterized in that the optical encoder used
It is fiber delay line or fiber grating or liquid crystal or AWG or PLC.
8. anti-intercepting and capturing FSO- optical fiber hybrid network according to claim 7, which is characterized in that the reception optical signal coupling
Spatial beam is coupled in optical fiber by device using coupled lens, optical coupling efficiency wave with the fluctuation of atmospheric turbulance
It is dynamic.
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| CN109523884A (en) * | 2018-12-28 | 2019-03-26 | 江苏亨通问天量子信息研究院有限公司 | Teaching demonstration system is eavesdropped in fiber optic communication |
| CN114050890A (en) * | 2021-11-10 | 2022-02-15 | 北京机电工程研究所 | Multi-type information transmission device adaptive to optical fiber network |
| CN114070404A (en) * | 2021-11-10 | 2022-02-18 | 北京机电工程研究所 | Optical fiber network working method based on multi-type test equipment |
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Application publication date: 20181214 |