CN105429710B - Phase modulated optical signal encrypted physical method and system based on light phase encryption - Google Patents
Phase modulated optical signal encrypted physical method and system based on light phase encryption Download PDFInfo
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- CN105429710B CN105429710B CN201510872270.6A CN201510872270A CN105429710B CN 105429710 B CN105429710 B CN 105429710B CN 201510872270 A CN201510872270 A CN 201510872270A CN 105429710 B CN105429710 B CN 105429710B
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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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
Abstract
The invention discloses a kind of phase modulated optical signal encrypted physical method and system based on light phase encryption, this method comprises the following steps：In transmitting terminal, by the phase modulated optical signal for having modulated transmission information, load and carry out phase bit encryption with time fast-changing phase encrypted traffic number；In receiving terminal, equal using, amplitude identical with phase encryption information speed and opposite polarity phase decrypts electric signal, carries out phase decryption to the phase modulated optical signal being encrypted, is demodulated system again afterwards.The present invention, using being loaded in phase modulated optical signal phase bit encryption is carried out with time fast-changing phase encrypted traffic number, recycling is identical with phase encryption information speed, amplitude is equal and opposite polarity phase decryption electric signal, phase decryption is carried out to the phase modulated optical signal being encrypted, realize to phase modulated optical signal encrypted physical, cost substantially reduces compared to Quantum Optical Communication and chaotic optical communication scheme, and simultaneity factor reliability is also higher.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to the phase modulated optical signal physics based on light phase encryption adds
Decryption method and system.
Background technology
The secrecy provision of existing optical communication system still using the stream cipher encryption and decryption technology based on Electric signal processing,
Due to being limited by electronics " bottleneck ", its encryption and decryption speed is relatively low, and laboratory flank speed is only 2.5Gbit/s.Occur prominent
During hair event, the portfolio of existing optical communication network will likely be traditional based on telecommunications into tens times even sharp increase of hundreds of times
Number processing encryption and decryption technology be difficult in adapt to ultrahigh speed and the business demand of vast capacity, also can not the completely compatible full light of the next generation
Communication network, and the speed of the encryption and decryption technology based on all-optical signal processing can exceed 100Gbit/s.Meanwhile existing light
Fiber communication net does not take data optical signal any safe handling in area of light, and fiber channel is only responsible for signal transmission, i.e.,
Bit light code is made transparently to next node from a node.In addition, SDH (the same step numbers in China's fiber optic communication network
Font system) and DWDM (dense wave division multipurpose) technical systems both from foreign countries, its interface protocol, performance parameter and code stream characteristic
Etc. equal external disclosure, the defects of this is one fatal for optical communication net.
As fiber optic communication network attack develops rapidly with Eavesdropping, directly steal optical fiber and transmit data, optical-fiber network pipe
Reason system information has become reality by the possibility that modification and optical network node equipment are attacked, and optical-fiber network faces safety at any time
Threaten, the safety of data message can not be ensured.Therefore, the demand of the encryption and decryption technology based on all-optical signal processing is compeled in eyebrow
Eyelash.
Current optical signal encrypted physical scheme mainly has following several：
(1) Quantum Optical Communication, safe physical encryption technology is presently the most, its general principle is using single photon as base
Plinth, identical photon is produced in strange land as password, information is encrypted by the use of this single photon as password.Because this is one
Kind encrypted physical means, can produce and abolish at any time in strange land, therefore can not almost be decrypted.
Early in 1992, the quantum communications that Britain Telecom has just been carried out with AT＆T Labs of the U.S. on single-mode fiber were tested,
Signal transmits on 1550 wave bands, quantum cryptography carrier is 1310nm photons, Successful transmissions dozens of kilometres.
2013, the quantum of Massachusetts Polytechnics and optic communication group, utilize the relevance of tangling of related quantum, development
A kind of new Data Encryption Techniques, greatly improve the encryption efficiency of quantum, and make the security of encryption close to quantum limit.Its
Experimental result has been published in《Physical comment bulletin》On (Physical Review Letters).
2014, Pan Jianwei academician team of Chinese University of Science and Technology and Chinese Academy of Sciences's Shanghai micro-system and information technology research institute and Tsing-Hua University were big
Cooperation is learned, with reference to state method and measurement device independent protocol is inveigled, safe distance is broken through to 200 kilometers, and have chosen Hefei
3 nodes of city's quantum communications net have carried out on-site verification, have created new world record.
The shortcomings that quantum secure optic communication is also obvious：First, quantum communications equipment is complicated, production and
Maintenance cost is very high, and some of device volumes are larger to be difficult to integrate；Secondly, Quantum Optical Communication signal is not suitable for having spread existing
If commercial network on transmit；Finally, and above all for a large amount of commercial common light-transmissive signal at present, amount
Son communication can not be accomplished directly to encrypt.
(2) chaotic optical communication, is the physical encryption technology of another rising in recent years, the basic thought of chaotic secret communication
It is by the use of chaotic signal as carrier wave, among transmission signal is hidden in into chaotic carrier, or is analyzed and assigned by symbolic dynamics
Different waveforms is given to demodulate transmitted letter using the attribute or synchronizing characteristics of chaos in receiving terminal with different information sequences
Breath.Therefore the Chaotic Synchronous of receiving-transmitting sides is the key that whole system is realized.Synchronous premise is that the chaos sequence of both sides occurs
Device needs identical initial value.
1994, Colet P and Roy R proposed the scheme [1] of chaotic optical communication first on Optics letters.
2005, Argyris et al. borrows 120 kilometers of commercial optical-fiber networks in Athens realized 1Gbit/s chaotic secret communication, error code
Rate is the 10E-7 orders of magnitude [2], and this is to realize chaotic secret communication in commercial network first in the world.
The advantages of chaotic optical communication is that structure is relatively simple；Signal can pass in existing single-mode fiber commercial network
It is defeated；And mixing transmission can be carried out with existing commercial optical signal under certain protection interval.But chaotic optical communication technology according to
It can not so realize and existing commercial optical signal is directly encrypted.
(3) full light XOR encryption technology.Its principle is the invertibity using XOR, first with light key sequence pair light number
Be encrypted to obtain ciphertext according to sequence, afterwards recycle identical light key sequence pair glyphed sequence be decrypted recover it is original
Clear data sequence.
Early in 2002, Nielsen M L et al. just propose to be realized using SOA-MZI (SOA Mach-Zehnder interferometers)
The scheme of optical signal XOR encryption.The program is compact-sized, cost is cheap, but response speed is slower, is only capable of meeting below 10G
The scrambled of speed.
2008, Jung Y et al. had also been proposed the XOR realized using SOA cross-phase modulation effect to optical signal
Encryption, realizes the encryption and decryption to a 10G NRZ optical signal in experiment.But also due to carrier slower SOA returns
The multiple time, limit its performance under high-speed condition.
2009, Fok.M.P et al. realized the XOR of optical signal using the Kerr effect of highly nonlinear optical fiber (HNLF)
Encryption.Due to HNLF response speed quickly, possess very high nonlinear factor, therefore can obtain more than 100Gbit/s's
Encryption rate.But because its volume is big, complicated, it is more difficult to realize commercial.
Currently, the optical transport form of key optical communication net turns to phase-modulation via original intensity modulated, to obtain
Higher transmission performance.Therefore, backbone optical network is badly in need of a kind of simple in construction, can be directly applied for commercial network modulation format
Optical physics encryption method.
The content of the invention
The technical problems to be solved by the invention are how to provide a kind of simple in construction, can be directly applied for commercial network tune
The problem of optical physics cipher mode of form processed.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention be to provide it is a kind of based on comentropy measurement
Deep packet inspection device abnormal flow monitoring method, comprises the following steps：
In transmitting terminal, by the phase modulated optical signal for having modulated transmission information, load with time fast-changing phase
Encrypted traffic number carries out phase bit encryption；
In receiving terminal, equal using, amplitude identical with phase encryption information speed and opposite polarity phase decrypts telecommunications
Number, phase decryption is carried out to the phase modulated optical signal being encrypted, is demodulated system again afterwards.
In the above-mentioned methods, after removing transmission link delay, phase encrypted traffic number and phase decryption electric signal are tight
Lattice are synchronous.
In the above-mentioned methods, the phase encrypted traffic number speed that changes with time necessarily be greater than corresponding phase modulated optical signal
The possible highest convergence rate of phase estimation algorithm of receiving terminal.
In the above-mentioned methods, the variation pattern of phase encrypted traffic number is random.
Present invention also offers it is a kind of based on light phase encryption phase modulated optical signal physical enciphering system,
Transmitting terminal includes light phase modulation module and light phase encrypting module, and the light phase modulation module will transmit information
It is modulated in phase modulated optical signal, the light phase encrypting module loads in phase modulated optical signal quickly to be changed with the time
Phase encrypted traffic number carry out phase bit encryption；
Receiving terminal includes light phase deciphering module and light phase demodulation module, and the light phase deciphering module produces and phase
Bit encryption information rate is identical, amplitude is equal and opposite polarity phase decryption electric signal, to the phase modulated light being encrypted
Signal carries out phase decryption, is demodulated system by the light phase demodulation module afterwards.
In the above-mentioned phase modulated optical signal physical enciphering system encrypted based on light phase, the tune of phase modulated optical signal
Form processed include but is not limited to single carrier QPSK, DQPSK, 8DPSK, 16DPSK, QDPASK, IRZ-DQPSK, IRZ-QDPASK with
And coherent light OFDM.
Above-mentioned based in the phase modulated optical signal physical enciphering system of light phase encryption, believed using system synchronization all the way
The phase encrypted traffic number and the phase number is controlled to decrypt the sequential relationship of electric signal and phase modulated optical signal.
In the above-mentioned phase modulated optical signal physical enciphering system encrypted based on light phase, transmission link delay shadow is removed
After sound, phase encrypted traffic number and phase decryption electric signal stringent synchronization.
The present invention, phase is carried out with time fast-changing phase encrypted traffic number using being loaded in phase modulated optical signal
Bit encryption, recycling is identical with phase encryption information speed, amplitude is equal and opposite polarity phase decryption electric signal, to being added
The phase modulated optical signal of close mistake carries out phase decryption, realizes to phase modulated optical signal encrypted physical, cost is compared to amount
Sub-light communicates and chaotic optical communication scheme substantially reduces, and simultaneity factor reliability is also higher.
Brief description of the drawings
Fig. 1 is the phase modulated optical signal physical enciphering system schematic diagram provided by the invention based on light phase encryption；
Fig. 2 is the schematic diagram of light phase encrypting module in the present invention；
Fig. 3 is the schematic diagram of light phase deciphering module in the present invention.
Embodiment
The invention provides a kind of phase modulated optical signal encrypted physical method based on light phase encryption, encryption information can
To be adjusted to encryption complexity with being actually needed, in that context it may be convenient to compatible various phase modulated optical signals, including single load
Ripple QPSK, coherent light OFDM etc., and cost is low, reliability is high.With reference to specification drawings and specific embodiments to this hair
It is bright to be described in detail.
As shown in figure 1, the phase modulated optical signal physical enciphering system provided by the invention based on light phase encryption includes
Light phase modulation module 10, light phase encrypting module 20, optical transmission chain 30, light phase deciphering module 40 and light phase demodulation
Molding block 50.
Light phase modulation module 10 includes narrow linewidth light source 11, light I/Q modulators 12 and modulation signal generation device 13.
Narrow linewidth light source 11 is input to light I/Q modulators 12 and produces light carrier, meanwhile, the serial data to be transmitted (transmitting information) is sent
Enter modulation signal generation device 13, produce I/Q modulation signals (two-way parallel binary data), and input light I/Q is modulated
Device 12, thus will transmission modulates information on light carrier, modulation format is single carrier QPSK, DQPSK, 8DPSK, 16DPSK,
QDPASK, IRZ-DQPSK, IRZ-QDPASK and coherent light OFDM etc..
As shown in Figure 1 and Figure 2, light phase encrypting module 20 includes optical phase modulator 21 and phase encrypted traffic number produces
Device 22, has modulated the light carrier input optical phase modulator 21 of transmission information, and phase encrypted traffic generation device 22 produces
One group of binary digital signal S changed over time changes with time as phase encrypted traffic number, phase encrypted traffic number
Speed necessarily be greater than the possible highest convergence rate of phase estimation algorithm of corresponding phase modulated optical signal receiving terminal, phase bit encryption
Electric signal is by phase modulator modulation to the modulated light carrier of single carrier QPSK signals, realizing to single carrier
The phase bit encryption of QPSK optical signals.Meanwhile using system synchronization signal input phase encrypted traffic generation device all the way, it is used for
Control the sequential relationship of phase encrypted traffic number and single carrier QPSK optical signals.
As shown in Figure 1, Figure 3, light phase deciphering module 40 produces dress by optical phase modulator 41 and phase decryption electric signal
Put 42 compositions.Optical signal after phase bit encryption is transferred to optical phase modulator 41, phase decryption telecommunications by optical transmission chain 30
Number generation device 42 produces that one group identical with the phase encrypted traffic speed of transmitting terminal, amplitude is equal and opposite polarity two enter
Data signal processedElectric signal is decrypted as phase, by phase-modulator 41 (with the phase-modulator in phase encrypting module
Parameter is completely the same) on the light carriers of the single carrier QPSK signals that have been modulated to encrypted, optical signal is decrypted.Together
When, decrypt electric signal generation device 42 using system synchronization signal input phase all the way, for control phase decryption electric signal with
The sequential relationship of optical signal, its principle are after transmission link delay is removed, and phase is decrypted electric signal and added with the phase started
Cipher telegram signal Complete Synchronization.
Light phase demodulation module 50 includes coherent receiver 51, digital signal processing unit 52 and local oscillations light source
53.Light phase demodulation module 50 is using relevant detection mode, by the single carrier QPSK optical signals after decryption and local oscillations light
Input coherent receiver 51 carries out beat frequency jointly in source (LO light sources), obtains the electric signal on I roads and Q roads, is being sent at data signal
The data recovering algorithms that unit 52 carries out some list carrier wave QPSK signals such as offset estimation, phase estimation, channel estimation are managed, most
The serial data identical electric signal that transmission is wanted with transmitting terminal is recovered eventually.
Phase modulated optical signal encrypted physical method provided by the invention based on light phase encryption, comprises the following steps：
In transmitting terminal, by the phase modulated optical signal for having modulated transmission information, load with time fast-changing phase
Encrypted traffic number carries out phase bit encryption；
In receiving terminal, equal using, amplitude identical with phase encryption information speed and opposite polarity phase decrypts telecommunications
Number, phase decryption is carried out to the phase modulated optical signal being encrypted, is demodulated system again afterwards.
Phase bit encryption and phase decrypting process should meet following two conditions：
(1) after transmission link delay is removed, phase modulation encrypted traffic number and phase modulation decrypt electric signal
The necessary stringent synchronization of process, and the change to optical signal phase information is completely counterbalanced by, so as to ensure that phase modulated optical signal can
It is correctly decrypted to receive；
(2) the phase encrypted traffic number speed that changes with time necessarily be greater than the phase modulated optical signal receiving terminal phase and estimate
The possible highest convergence rate of calculating method, so as to ensure the success of encryption.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn that the knot made under the enlightenment of the present invention
Structure changes, and the technical schemes that are same or similar to the present invention, each falls within protection scope of the present invention.
Claims (4)
1. the phase modulated optical signal encrypted physical method based on light phase encryption, it is characterised in that comprise the following steps：
In transmitting terminal, in the phase modulated optical signal for having modulated transmission information, load with time fast-changing phase bit encryption
Electric signal carries out phase bit encryption；
In receiving terminal, equal using, amplitude identical with phase encryption information speed and opposite polarity phase decrypts electric signal, right
The phase modulated optical signal being encrypted carries out phase decryption, is demodulated system again afterwards；
Phase bit encryption and phase decrypting process should meet following two conditions：
After transmission link delay is removed, the process of phase modulation encrypted traffic number and phase modulation decryption electric signal is necessary
Stringent synchronization, and the change to optical signal phase information is completely counterbalanced by；
The phase encrypted traffic number speed that changes with time necessarily be greater than the phase modulated optical signal receiving terminal phase estimation algorithm
Possible highest convergence rate.
2. the method as described in claim 1, it is characterised in that the variation pattern of phase encrypted traffic number is random.
3. the phase modulated optical signal physical enciphering system based on light phase encryption, it is characterised in that：
Transmitting terminal includes light phase modulation module and light phase encrypting module, and the light phase modulation module will transmit modulates information
Onto phase modulated optical signal, the light phase encrypting module is loaded in phase modulated optical signal with time fast-changing phase
Bit encryption electric signal carries out phase bit encryption；
Receiving terminal includes light phase deciphering module and light phase demodulation module, and the light phase deciphering module produces to be added with phase
Confidential information speed is identical, amplitude is equal and opposite polarity phase decryption electric signal, to the phase modulated optical signal being encrypted
Phase decryption is carried out, system is demodulated by the light phase demodulation module afterwards；
Phase bit encryption and phase decrypting process should meet following two conditions：
The phase encrypted traffic number speed that changes with time necessarily be greater than the phase estimation of corresponding phase modulated optical signal receiving terminal
The possible highest convergence rate of algorithm；
Light phase encrypting module includes optical phase modulator and phase encrypted traffic generation device, is believed using system synchronization all the way
Number input phase encrypted traffic generation device, for controlling the sequential of phase encrypted traffic number and phase modulated optical signal to close
System；Light phase deciphering module is made up of optical phase modulator and phase decryption electric signal generation device, utilizes system synchronization all the way
Signal input phase decrypts electric signal generation device, for controlling the sequential of phase decryption electric signal and phase modulated optical signal to close
System, its principle are after transmission link delay is removed, and the phase encrypted traffic number of phase decryption electric signal and transmitting terminal is complete
It is synchronous.
4. the phase modulated optical signal physical enciphering system as claimed in claim 3 based on light phase encryption, it is characterised in that
The modulation format of phase modulated optical signal includes but is not limited to single carrier QPSK, DQPSK, 8DPSK, 16DPSK, QDPASK, IRZ-
DQPSK, IRZ-QDPASK and coherent light OFDM.
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| CN111555817A (en) * | 2020-05-09 | 2020-08-18 | 国网江苏省电力有限公司无锡供电分公司 | Differential modulation safety optical communication method and device based on coherent optical system |
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| CN110995359B (en) * | 2019-11-19 | 2021-05-14 | 武汉邮电科学研究院有限公司 | Phase modulation method and system based on digital DSP demodulation |
| CN111355536B (en) * | 2020-02-10 | 2021-08-17 | 山东师范大学 | Nonlinear damage compensation system and method for CO-OFDM transmission system |
| CN113644979A (en) * | 2021-06-25 | 2021-11-12 | 北京邮电大学 | Communication method and system based on phase rotation in overhead OPGW optical cable |
| CN113703199B (en) * | 2021-07-30 | 2024-02-20 | 山东师范大学 | Method and device for improving light field coherence self-repairing capability |
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| US8290371B2 (en) * | 2008-09-19 | 2012-10-16 | Telcordia Technologies, Inc. | OCDM-based all optical multi-level security |
| CN103259601A (en) * | 2013-04-23 | 2013-08-21 | 安徽问天量子科技股份有限公司 | Optical signal phase modulation device for quantum secret key communication |
| CN104980228B (en) * | 2015-06-29 | 2017-08-08 | 工业和信息化部电信研究院 | A kind of optical signal transmission method and device |
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| CN111555817A (en) * | 2020-05-09 | 2020-08-18 | 国网江苏省电力有限公司无锡供电分公司 | Differential modulation safety optical communication method and device based on coherent optical system |
| CN111555817B (en) * | 2020-05-09 | 2021-04-02 | 国网江苏省电力有限公司无锡供电分公司 | Differential modulation safety optical communication method and device based on coherent optical system |
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |