CN107231227A - A kind of communication system and communication means that chaotic carrier is spread based on ultra wide band - Google Patents
A kind of communication system and communication means that chaotic carrier is spread based on ultra wide band Download PDFInfo
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- CN107231227A CN107231227A CN201710406274.4A CN201710406274A CN107231227A CN 107231227 A CN107231227 A CN 107231227A CN 201710406274 A CN201710406274 A CN 201710406274A CN 107231227 A CN107231227 A CN 107231227A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
- H04B10/60—Receivers
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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
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Abstract
The present invention relates to a kind of communication system and communication means that chaotic carrier is spread based on ultra wide band, mainly solve the low technical problem of confidentiality present in prior art, the present invention includes Spectrum compression module by using the reception device, the first photo-coupler OC1 being connected with Spectrum compression module, the first photo-coupler OC1 is output as two-way, Chaotic Synchronous unit is directly connected to all the way, and another road connects the first connection end of Chaotic Synchronous unit by photoelectric conversion unit；The dispensing device includes chaos outside cavity gas laser, the MZ modulators being connected with chaos outside cavity gas laser, the spread spectrum module being connected with MZ modulators；The Spectrum compression module technical scheme opposite with spread spectrum module parameter, preferably resolves the problem, available in the communication system of chaotic carrier.
Description
Technical field
The present invention relates to chaotic communication technical field, a kind of communication that chaotic carrier is spread based on ultra wide band is related specifically to
System and communication means.
Background technology
In recent years, with the high speed development of a networked society, network capacity and the network user show volatile growth.
Chaotic communication technology is widely paid close attention to due to its efficient physics layer independence, but is due to its chaotic laser light signal
Spectrum energy is concentrated near the relaxation oscillation frequency of laser, so as to cause Bandwidth-Constrained；And the efficacious prescriptions such as Chaotic Synchronous injection
Formula can effective decoded information, had a strong impact on the security performance based on chaotic laser light signal communications system.Therefore it provides one
The chaos letter system for planting strong security is just critically important.
Because the laser chaos signal that semiconductor laser is produced under the conditions of light feedback, light injection etc. has high initial value quick
Perception, along with the unique bandwidth characteristic of chaotic laser light signal, therefore the chaotic communication based on semiconductor laser is in recent years
Become a big focus of optic communication research field.The semiconductor chaos that current most of laser chaos communication systems are used
Laser, because its inherent shortcoming causes finite bandwidth limited and the leakage of laser Delay, therefore using such as linear filtering
Method injection method may filter out effective information from channel, while can also be by the way that the chaotic laser light signal in channel is injected
Chaotic Synchronous is realized into an identical semiconductor laser, chaos pass filtering effect acquisition of information is utilized.The present invention is by inciting somebody to action
Chaos semiconductor laser output original chaotic laser signal by spread spectrum module carry out video stretching processing after as newly
Carrier-wave transmission, based on this, proposes a kind of secret signalling that chaotic carrier is spread based on ultra wide bandwidth.
The content of the invention
The technical problems to be solved by the invention are the problem of confidentiality are low present in prior art.There is provided a kind of new
The communication system of chaotic carrier is spread based on ultra wide band, the communication system that should spread chaotic carrier based on ultra wide band has confidentiality
High the characteristics of.
In order to solve the above technical problems, the technical scheme used is as follows：
A kind of communication system that chaotic carrier is spread based on ultra wide band, the system is included：Dispensing device, reception device,
The dispensing device is connected with reception device by fiber channel；The reception device includes Spectrum compression module, with frequency spectrum pressure
First photo-coupler OC1 of contracting module connection, the first photo-coupler OC1 are output as two-way, chaos are directly connected to all the way same
Unit is walked, another road connects the first connection end of Chaotic Synchronous unit by photoelectric conversion unit；The Chaotic Synchronous unit includes
Semiconductor laser SSL, the second photo-coupler being connected with semiconductor laser SSL, the second photo-coupler OC2's is another
Input connects optoisolator OI, and the second photo-coupler OC2 correspondence positions are provided with speculum M；
The dispensing device includes chaos outside cavity gas laser, and the MZ modulators being connected with chaos outside cavity gas laser are adjusted with MZ
The spread spectrum module of device connection processed；The chaos outside cavity gas laser is connected including semiconductor laser MSL with semiconductor laser MSL
The 3rd photo-coupler OC3, the 3rd photo-coupler OC3 correspondence positions be provided with speculum M；
The Spectrum compression module is opposite with spread spectrum module parameter.
The operation principle of the present invention：The chaos optical signal produced by ECLD by electro-optic phase by being adjusted
The spread spectrum module of device processed and high dispersive medium composition carries out spread spectrum conversion, realizes the ultra wide band of transmitting terminal laser chaos signal
It is wide；Inverse transformation is carried out using Spectrum compression module in receiving terminal, chaos injection locking synchronization realizes the demodulation of signal, so as to complete
Chaotic communication.
In above-mentioned technical proposal, for optimization, further, the spread spectrum module includes electro-optic phase modulator PM1 and light
Electric phase-modulator PM2, the dispersive medium being connected with electro-optic phase modulator PM2；The electro-optic phase modulator PM1 and first
Electro-optic phase modulator radio-frequency driven end is connected；The electro-optic phase modulator PM2 and the second electro-optic phase modulator radio frequency drive
Moved end is connected；The first electro-optic phase modulator radio-frequency driven end includes the first radio frequency source and the first radio frequency amplifier of series connection
Amp1；The second electro-optic phase modulator radio-frequency driven end includes the second radio frequency source and the second radio frequency amplifier of series connection
Amp2。
Further, the Spectrum compression module includes dispersive medium, the electro-optic phase modulator being connected with dispersive medium
PM1 and electro-optic phase modulator PM2；The electro-optic phase modulator PM1 and the first electro-optic phase modulator radio-frequency driven end connect
Connect；The electro-optic phase modulator PM2 is connected with the second electro-optic phase modulator radio-frequency driven end；First electro-optic phase is adjusted
Device radio-frequency driven end processed includes the first radio frequency source and the first radio frequency amplifier Amp1 of series connection；The second electro-optic phase modulator
Radio-frequency driven end includes the second radio frequency source and the second radio frequency amplifier Amp2 of series connection.
Further, the Spectrum compression module it is opposite with spread spectrum module parameter including：The color of the Spectrum compression module
Dispersion media dispersion values are opposite with the dispersion values of spread spectrum module take it is negative；The phase drive signal frequency of the radio frequency source of Spectrum compression module first
The phase drive signal frequency of rate and the phase drive signal frequency of the second radio frequency source respectively with the first radio frequency source in spread spectrum module
Rate and the phase drive signal frequency of the second radio frequency source are identical；The drive signal voltage of the radio frequency source of Spectrum compression module first and
The drive signal voltage of two radio frequency sources respectively with the drive signal voltage of the first radio frequency source in spread spectrum module and the second radio frequency source
Drive signal voltage conversely takes negative.
Further, the spread spectrum module dispersive medium and Spectrum compression module dispersive medium are high-dispersive fibre 1.
Further, the photoelectric conversion unit includes the first photoelectric detector PD 1, the second photoelectric detector PD 2；It is described
First photoelectric detector PD 1 and the second photoelectric detector PD 2 are connected by subtracter with low pass filter.
Further, the fiber channel includes optical fiber and EDFA Erbium-Doped Fiber Amplifier EDFA；The EDFA Erbium-Doped Fiber Amplifier
EDFA is used to be amplified to compensate for loss of signal.
The present invention also provides a kind of communication means for the communication system that chaotic carrier is spread based on ultra wide band, including：
(1) chaos outside cavity gas laser produces original chaotic laser signal x (t), to the original chaotic laser signal x (t)
It is modulated, spreads conversion：Semiconductor laser MSL exports continuous laser signal, is divided into two-way through the 3rd photo-coupler OC3,
It is output signal all the way, reflected mirror M reflection, which is returned in semiconductor laser MSL, all the way forms light feedback；
(2) fibre channel transmission, is exported through optical fiber link, and uses Er-doped fiber to loss optical signal in a link
Amplifier is amplified；
(3) reception device carries out Spectrum compression to the signal of fibre channel transmission and signal recovers：The frequency spectrum of reception device
Compression module carries out signal recovery to the chaotic signal inverse transformation received, is divided into two-way by the first photo-coupler OC1；All the way
Electric signal is converted into through the first photoelectric detector PD 1 for signal to recover；Another road enters semiconductor through optoisolator IO and swashed
Light device SSL, reflected mirror M formation backfeed loop completes chaotic signal synchronization；Chaos laser output optical signal warp after synchronization
Second photoelectric detector PD 2 is converted to electric signal and recovered for signal；Reception device is used for after two-way in system is changed through PD
The electric signal that signal recovers obtains demodulated signal m'(t through subtracter).
The cosine electric signal for two different frequencies that first radio frequency source and the second radio frequency source are produced in the present invention, input is to penetrating
Audio amplifier Amp, radio frequency amplifier Amp cosine signal is amplified after as modulated signal, to inputting to the first of cascade
Electro-optic phase modulator PM1, the second electro-optic phase modulator PM2 chaos optical signal are modulated, finally by the letter after modulation
Number input to dispersive medium, after dispersive medium is handled complete spread spectrum conversion.After spread spectrum module processing through dispensing device
Optical signal, input optical fibre transmission is simultaneously carried out after light amplification compensation channel loss, is carried out by receiving terminal Spectrum compression module
Inverse transformation, the dispersive medium dispersion values of receiving terminal set it is opposite with the dispersion values in the spread spectrum module of transmitting terminal take it is negative；Connect
Receiving end phase drive signal set of frequency is identical with the driving signal frequency in transmitting terminal spread spectrum module；Receiving-end voltage set with
Drive signal voltage in the spread spectrum module of transmitting terminal conversely takes negative.Recovered after change action by Spectrum compression module
Chaotic signal is divided into two-way, and the chaos laser with identical parameters that receiving terminal is injected all the way realizes Chaotic Synchronous；All the way with
Chaotic laser light output after receiving terminal synchronization is provided commonly for demodulating initial information after opto-electronic conversion.
Sending module work comprises the following steps：
(1) original chaotic laser signal x (t) is obtained；
Semiconductor laser MSL exports continuous laser signal, is divided into two-way through the 3rd photo-coupler OC3, is all the way output
Signal, reflected mirror M reflection, which is returned in semiconductor laser MSL, all the way forms light feedback, and now, semiconductor laser output is just
Beginning chaotic laser light signal x (t), by the information m (t) of transmission be binary sequence by MZ modulators modulates to chaotic carrier,
Optical signal now with transmission information is x'(t).
(2) using phase-modulator to signal temporal envelope x'(t) phase-modulation is carried out, if the biography of electro-optic phase modulator
Delivery function is：
hPM(t)=exp [iKP1cos(ω1t)+iKP2cos(ω2t)]
Wherein, Kp1,Kp2For the index of modulation, ω1And ω2Represent two respective angular frequencys of cosinusoidal component of amplitude modulation drive signal
Rate；
Using phase-modulator to signal temporal envelope x'(t) handle after signal be：
xp(t)=x'(t) hPM(t)
(3) will be mixed by signal xp(t) dispersive medium is passed through, the spread spectrum conversion of completion laser chaos signal, which is worked as, ignores high order
Dispersion when, the frequency domain transfer function expression formula of optical fiber is：
Wherein,λ0For signal wavelength, c is the light spread speed in vacuum, and D is dispersive medium dispersion system
Number；I represents imaginary part；
The expression formula that the frequency domain transfer function of optical fiber is transformed into time domain is：
Wherein, F-1Inversefouriertransform is represented, C' is and β2Constant coefficient relevant z, z is fiber lengths；
As signal xp(t) when by dispersive medium, by signal xp(t) obtained with dispersive medium transmission function as convolution, spread spectrum becomes
Change rear output signal
xout(t)=xp(t)*hD(t)
Wherein, * represents signal convolution；
The work of optical fiber transmission channel comprises the following steps：The spread spectrum output chaos optical signal of step one is entered through optical fiber link
Go and transmit, and use erbium-doped fiber amplifier to be amplified loss optical signal in a link and be lost with thermal compensation signal.
Receiving module work comprises the following steps：
(1) optical signal received first passes through Spectrum compression module and carries out inverse transformation, the structure and hair of Spectrum compression module
The spread spectrum module composition for penetrating module is identical, the difference is that device order, optical fiber parameter and drive signal parameters, what inverse transformation was obtained
Signal is x'rec(t)；
(2) by optical signal x'rec(t) it is divided into two-way through the 1st coupler OC1, is changed all the way through the first photoelectric detector PD 1
Recover for electric signal for signal；Another road is entered from laser SSL through optoisolator IO；
(3) the laser chaos signal for entering semiconductor laser SSL is divided into two-way by coupler, and reflected mirror M exists all the way
Feedback is formed in laser；Another road is as semiconductor laser SSL output, and the optical signal of output is through the second photodetector
PD2 is converted into electric signal and recovered for signal；
(4) electric signal after changing step (1) and step (3) through photoelectric detector PD obtains demodulated signal through subtracter
m'(t)。
Beneficial effects of the present invention：
Effect one, does not change traditional chaotic communication system structure, and a spread spectrum module is set outside the chamber of chaos laser,
Video stretching and Spectrum compression are carried out to chaotic laser light signal, realized simple；
Effect two, super large effective bandwidth；Original chaotic signal is after spread spectrum conversion, and frequency spectrum effective bandwidth has been obtained greatly
Raising, reached more than 70GHz；
Effect three, flatness is good；Original chaotic signal is after spread spectrum conversion, and the frequency spectrum flatness after spread spectrum conversion is obtained
Great raising；
Effect four, confidentiality is high, and the chaotic signal transmitted in channel is converted by spread spectrum, linear filtering method and Chaotic Synchronous
The decoding processes such as attack method obtain the measure of signal, and the bit error rate is high；Only under conditions of each module parameter is identical,
Initial information can effectively be recovered.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of schematic diagram for the communication system that chaotic carrier is spread based on ultra wide band of the present invention；
Fig. 2 is spread spectrum module structure chart in the present invention；
Fig. 3 is intermediate frequency spectrum compression module structure chart of the present invention
Fig. 4 is the time domain beamformer of original chaotic laser signal；
Fig. 5 is the frequency-domain waveform figure of original chaotic laser signal；
Fig. 6 is the time domain beamformer of chaotic laser light signal after spread spectrum conversion；
Fig. 7 is the frequency-domain waveform figure of chaotic laser light signal after spread spectrum conversion；
Fig. 8 is transmitting terminal initial signal schematic diagram；
Fig. 9 is recipient's demodulated signal schematic diagram；
Figure 10 is that recipient receives signal eye diagram；
The signal that the direct filter methods of Figure 11 are demodulated；
The direct filter method demodulated signal eye patterns of Figure 12；
The signal that Figure 13 Chaotic Synchronous methods are demodulated；
Figure 14 Chaotic Synchronous sends out demodulated signal eye pattern；
The quality factor q of Figure 15 legitimate correspondences and illegal communication with information bit rate change.
In accompanying drawing,
1- high-dispersives are fine.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
The present embodiment provides a kind of communication system that chaotic carrier is spread based on ultra wide band, and such as Fig. 1, the system includes：
Dispensing device, reception device, the dispensing device is connected with reception device by fiber channel；The reception device includes frequency spectrum
Compression module, the first photo-coupler OC1, the first photo-coupler OC1 being connected with Spectrum compression module is output as two-way, one
Road is directly connected to Chaotic Synchronous unit, and another road connects the first connection end of Chaotic Synchronous unit by photoelectric conversion unit；It is described
Chaotic Synchronous unit includes semiconductor laser SSL, the second photo-coupler being connected with semiconductor laser SSL, described second
Photo-coupler OC2 another input connection optoisolator OI, the second photo-coupler OC2 correspondence positions are provided with speculum
M；
The dispensing device includes chaos outside cavity gas laser, and the MZ modulators being connected with chaos outside cavity gas laser are adjusted with MZ
The spread spectrum module of device connection processed；The chaos outside cavity gas laser is connected including semiconductor laser MSL with semiconductor laser MSL
The 3rd photo-coupler OC3, the 3rd photo-coupler OC3 correspondence positions be provided with speculum M；
The Spectrum compression module is opposite with spread spectrum module parameter.
The operation principle of the present invention：The chaos optical signal produced by ECLD by electro-optic phase by being adjusted
The spread spectrum module of device processed and high dispersive medium composition carries out spread spectrum conversion, realizes the ultra wide band of transmitting terminal laser chaos signal
It is wide；Inverse transformation is carried out using Spectrum compression module in receiving terminal, chaos injection locking synchronization realizes the demodulation of signal, so as to complete
Chaotic communication.
In above-mentioned technical proposal, for optimization, further, the spread spectrum module includes electro-optic phase modulator PM1 and light
Electric phase-modulator PM2, the dispersive medium being connected with electro-optic phase modulator PM2；The electro-optic phase modulator PM1 and first
Electro-optic phase modulator radio-frequency driven end is connected；The electro-optic phase modulator PM2 and the second electro-optic phase modulator radio frequency drive
Moved end is connected；The first electro-optic phase modulator radio-frequency driven end includes the first radio frequency source and the first radio frequency amplifier of series connection
Amp1；The second electro-optic phase modulator radio-frequency driven end includes the second radio frequency source and the second radio frequency amplifier of series connection
Amp2。
Specifically, the Spectrum compression module includes dispersive medium, the electro-optic phase modulator PM1 being connected with dispersive medium
And electro-optic phase modulator PM2；The electro-optic phase modulator PM1 is connected with the first electro-optic phase modulator radio-frequency driven end；
The electro-optic phase modulator PM2 is connected with the second electro-optic phase modulator radio-frequency driven end；The first electro-optic phase modulation
Device radio-frequency driven end includes the first radio frequency source and the first radio frequency amplifier Amp1 of series connection；The second electro-optic phase modulator is penetrated
Frequency drive end includes the second radio frequency source and the second radio frequency amplifier Amp2 of series connection.
Specifically, the Spectrum compression module it is opposite with spread spectrum module parameter including：The dispersion of the Spectrum compression module
Dispersion of Media value is opposite with the dispersion values of spread spectrum module take it is negative；The phase drive signal frequency of the radio frequency source of Spectrum compression module first
And second radio frequency source phase drive signal frequency phase drive signal frequency respectively with the first radio frequency source in spread spectrum module
And second radio frequency source phase drive signal frequency it is identical；The drive signal voltage and second of the radio frequency source of Spectrum compression module first
The drive of the drive signal voltage of radio frequency source respectively with the drive signal voltage and the second radio frequency source of the first radio frequency source in spread spectrum module
Dynamic signal voltage conversely takes negative.
Specifically, the spread spectrum module dispersive medium and Spectrum compression module dispersive medium are high-dispersive fibre 1.
Specifically, the photoelectric conversion unit includes the first photoelectric detector PD 1, the second photoelectric detector PD 2；Described
One photoelectric detector PD 1 and the second photoelectric detector PD 2 are connected by subtracter with low pass filter.
Specifically, the fiber channel includes optical fiber and EDFA Erbium-Doped Fiber Amplifier EDFA；The EDFA Erbium-Doped Fiber Amplifier
EDFA is used to be amplified to compensate for loss of signal.
Specifically, the optical fiber is high-dispersive fibre 1.
In the present embodiment, the first electro-optic phase modulator PM1 and the second electro-optic phase in the spread spectrum module of emitter
Modulator PM2 phase shift peak ranges are [0,2 π], and drive signal numerical value 1 represents phase π, 00 phase of correspondence, to passing through first
The chaotic laser light signal of section optical fiber carries out quadratic phase modulation；Dispersive medium is high-dispersive fibre 1, length LTFor：1km, dispersion
It is worth for DT：2×10-4s-1m2, the light after the first electro-optic phase modulator PM1 and the second electro-optic phase modulator PM2 modulation
Signal carries out frequency domain phase-modulation；
Wherein, receiving module is included from semiconductor laser SSL；Spread spectrum module；Photoelectric detector PD and subtracter, are used for
Chaotic signal demodulation recovers；
Semiconductor laser MSL produces continuous laser, and inputs to the 3rd photo-coupler OC3.3rd photo-coupler OC3 will
The continuous optical signal of input is divided into two-way, is exported all the way as laser, semiconductor laser MSL is fed back to all the way, by partly leading
Body laser MSL exports original chaotic laser signal.Original chaotic laser signal is as carrier wave, by having in MZ modulators modulates
Imitate signal, the chaotic laser light signal after output modulation；
After dispersive optical fiber is acted on, chaotic signal frequency spectrum has been applied in an opposite phase shift.Frequency in reception device
The phase shift peak value for composing two electro-optic phase modulators of compression module is [- 2 π, 0], to mixed after the effect of high-dispersive fibre 1
Ignorant laser signal carries out opposite phase-modulation.
The present embodiment also provides a kind of communication means for the communication system that chaotic carrier is spread based on ultra wide band, including：
(1) chaos outside cavity gas laser produces original chaotic laser signal x (t), to the original chaotic laser signal x (t)
It is modulated, spreads conversion：Semiconductor laser MSL exports continuous laser signal, is divided into two-way through the 3rd photo-coupler OC3,
It is output signal all the way, reflected mirror M reflection, which is returned in semiconductor laser MSL, all the way forms light feedback；
(2) fibre channel transmission, is exported through optical fiber link, and uses Er-doped fiber to loss optical signal in a link
Amplifier is amplified；
(3) reception device carries out Spectrum compression to the signal of fibre channel transmission and signal recovers：The frequency spectrum of reception device
Compression module carries out signal recovery to the chaotic signal inverse transformation received, is divided into two-way by the first photo-coupler OC1；All the way
Electric signal is converted into through the first photoelectric detector PD 1 for signal to recover；Another road enters semiconductor through optoisolator IO and swashed
Light device SSL, reflected mirror M formation backfeed loop completes chaotic signal synchronization；Chaos laser output optical signal warp after synchronization
Second photoelectric detector PD 2 is converted to electric signal and recovered for signal；Reception device is used for after two-way in system is changed through PD
The electric signal that signal recovers obtains demodulated signal m'(t through subtracter).
In the present embodiment, time domain beamformer of the original chaotic laser signal in 5ns is as shown in Figure 4；Original chaotic swashs
Optical signal spectrum oscillogram is as shown in Figure 5.Now, chaotic spectrum is precipitous and drastically declines after initial transient rising, causes
Effective bandwidth is limited, and original chaotic laser signal effective bandwidth is 6.8GHz.
Signal x'(t will be obtained after the upper information of original chaotic signal x (t) modulation) input spread spectrum module, spread spectrum module structure
As shown in Figure 2.Using phase-modulator to signal temporal envelope x'(t) handle；Signal xp(t) dispersive medium is passed through, it is complete
Spread and convert into chaotic signal.
Reception device Spectrum compression module with the spread spectrum module parameter setting of dispensing device as shown in figure 3, meet positive inversion
In the case of changing, the Spectrum compression module of receiving terminal carries out signal recovery to the chaotic signal inverse transformation received, and passes through the
One photo-coupler OC1 is divided into two-way；Electric signal is converted into through the first photoelectric detector PD 1 all the way for signal to recover；Another road
Entered through optoisolator IO from laser SSL；Reflected mirror M formation backfeed loop；Chaos laser output light after synchronization
Signal is converted to electric signal through the second photoelectric detector PD 2 and recovered for signal；Such as Fig. 1, two-way in system is passed through in receiving terminal
The electric signal for being used for signal recovery after PD conversions obtains demodulated signal m'(t through subtracter).
Fig. 6 is the time domain beamformer of chaotic laser light signal after spread spectrum conversion.By to chaotic laser light signal after spread spectrum conversion
Time domain beamformer in 5ns, compared with Fig. 4, the chaos time domain waveform in 5ns has become intensive.
Fig. 7 is the frequency-domain waveform figure of chaotic laser light signal after spread spectrum conversion.Compared with Fig. 5, this time-frequency spectrum is straightened into
Flat Spectra, effective bandwidth reaches 70GHz.
Fig. 8 is initial transmission information, is binary bit sequence；Fig. 9 recipient's demodulated signal；Figure 10 recipient receives letter
Number eye pattern；The signal that the direct filter methods of Figure 11 are demodulated；Figure 12 is direct filter method demodulated signal eye pattern；Figure 13 Chaotic Synchronous methods
The signal demodulated；Figure 14 Chaotic Synchronous sends out demodulated signal eye pattern；The quality factor q of Figure 15 legitimate correspondences and illegal communication is with letter
Cease the change of bit rate.
Comparison diagram 8, Fig. 9, Figure 10 understand that, when transmission rate is 2.5Gbit/s, signal can be effectively restored, product
Prime factor Q is 8.06, and the correspondence bit error rate is~10-16；As shown in Figure 11, Figure 13, signal waveform and initial signal waveform are demodulated
Huge difference is generated, the quality factor q of direct filter method is 1.52, and the correspondence bit error rate is~10-1, in Figure 12 and Figure 14
Eye pattern can not differentiate completely；If not knowing the feelings of Spectrum compression module parameter using with transmitting terminal identical laser
Chaotic Synchronous method decoding is carried out under condition, the quality factor q after demodulation has been even up to 0.51, and the correspondence bit error rate is~10-1, demodulation
Recover signal as shown in Figure 13, Figure 14, effect is more deteriorated for comparing direct filter method, and eye pattern can not equally be differentiated completely；
When transmission rate is 5Gbit/s, transmission error rates are~10-4, for illegal demodulation side, the quality of direct filter method because
Number Q is 0.42, and correspondence error code is 0.31, even if being carried out using with transmitting terminal identical laser in the case where not knowing change
Chaotic Synchronous method is decoded, and the quality factor q after demodulation is 0.27, and the bit error rate is~10-1.Figure 15 gives legitimate receipt on channel
Bit error rate quality factor q and illegal decoding information quality factor q with information rate changing rule.
In addition to information rate is continually changing, other specification keeps constant.As can be seen that in the present invention decoded information mistake
Bit rate is higher by a lot, and in the case of certain high-speed than proper communication, the bit error rate of decoding always near 0.5,
And legitimate receipt this remain able to obtain information with the relatively low bit error rate, all illustrate that the present invention significantly enhances the secrecy of information
Property.
Although illustrative embodiment of the invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the scope of embodiment, to the common skill of the art
For art personnel, as long as long as various change is in the spirit and scope of the invention that appended claim is limited and is determined, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (8)
1. a kind of communication system that chaotic carrier is spread based on ultra wide band, it is characterised in that：The system includes：Dispensing device,
Reception device, the dispensing device is connected with reception device by fiber channel；
The reception device includes Spectrum compression module, the first photo-coupler OC1 being connected with Spectrum compression module, described first
Photo-coupler OC1 is output as two-way, and Chaotic Synchronous unit is directly connected to all the way, and another road connects chaos by photoelectric conversion unit
The connection end of synchronization unit first；The Chaotic Synchronous unit includes semiconductor laser SSL, is connected with semiconductor laser SSL
The second photo-coupler, the second photo-coupler OC2 another input connection optoisolator OI, second photo-coupler
OC2 correspondence positions are provided with speculum M；
The dispensing device includes chaos outside cavity gas laser, the MZ modulators being connected with chaos outside cavity gas laser, with MZ modulators
The spread spectrum module of connection；The chaos outside cavity gas laser includes that semiconductor laser MSL is connected with semiconductor laser MSL
Three photo-coupler OC3, the 3rd photo-coupler OC3 correspondence positions are provided with speculum M；
The Spectrum compression module is opposite with spread spectrum module parameter.
2. the communication system according to claim 1 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The spread spectrum
Module includes electro-optic phase modulator PM1 and electro-optic phase modulator PM2, and the dispersion being connected with electro-optic phase modulator PM2 is situated between
Matter；The electro-optic phase modulator PM1 is connected with the first electro-optic phase modulator radio-frequency driven end；The electro-optic phase modulator
PM2 is connected with the second electro-optic phase modulator radio-frequency driven end；
The first electro-optic phase modulator radio-frequency driven end includes the first radio frequency source and the first radio frequency amplifier Amp1 of series connection；
The second electro-optic phase modulator radio-frequency driven end includes the second radio frequency source and the second radio frequency amplifier Amp2 of series connection.
3. the communication system according to claim 2 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The frequency spectrum
Compression module includes dispersive medium, the electro-optic phase modulator PM1 being connected with dispersive medium and electro-optic phase modulator PM2；Institute
Electro-optic phase modulator PM1 is stated to be connected with the first electro-optic phase modulator radio-frequency driven end；The electro-optic phase modulator PM2 with
Second electro-optic phase modulator radio-frequency driven end is connected；
The first electro-optic phase modulator radio-frequency driven end includes the first radio frequency source and the first radio frequency amplifier Amp1 of series connection；
The second electro-optic phase modulator radio-frequency driven end includes the second radio frequency source and the second radio frequency amplifier Amp2 of series connection.
4. the communication system according to claim 3 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The frequency spectrum
Compression module it is opposite with spread spectrum module parameter including：The dispersive medium dispersion values of the Spectrum compression module and the color of spread spectrum module
Scattered value conversely takes negative；The phase drive signal frequency of the radio frequency source of Spectrum compression module first and the phase driven letter of the second radio frequency source
Number frequency is believed with the phase drive signal frequency of the first radio frequency source in spread spectrum module and the phase driven of the second radio frequency source respectively
Number frequency is identical；The drive signal voltage of the radio frequency source of Spectrum compression module first and the drive signal voltage difference of the second radio frequency source
It is opposite with the drive signal voltage of the first radio frequency source in spread spectrum module and the drive signal voltage of the second radio frequency source take it is negative.
5. the communication system according to claim 3 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The spread spectrum
Dispersive medium in the dispersive medium and Spectrum compression module of module is fine for high-dispersive.
6. the communication system according to claim 1 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The photoelectricity
Converting unit includes the first photoelectric detector PD 1, the second photoelectric detector PD 2；The light of first photoelectric detector PD 1 and second
Electric explorer PD2 is connected by subtracter with low pass filter.
7. the communication system according to claim 1 that chaotic carrier is spread based on ultra wide band, it is characterised in that：The optical fiber
Channel includes optical fiber and EDFA Erbium-Doped Fiber Amplifier EDFA；The EDFA Erbium-Doped Fiber Amplifier EDFA is amplified to compensate for signal for signal
Loss.
8. the communication means of the communication system that chaotic carrier is spread based on ultra wide band according to claim 1-7, its feature
It is：The communication means includes：
(1) chaos outside cavity gas laser produces original chaotic laser signal x (t), and the original chaotic laser signal x (t) is carried out
Modulation, spread spectrum conversion：Semiconductor laser MSL exports continuous laser signal, is divided into two-way through the 3rd photo-coupler OC3, all the way
For output signal, reflected mirror M reflection, which is returned in semiconductor laser MSL, all the way forms light feedback；
(2) fibre channel transmission, is exported through optical fiber link, and uses Erbium-doped fiber amplifier to loss optical signal in a link
Device is amplified；
(3) reception device carries out Spectrum compression to the signal of fibre channel transmission and signal recovers：The Spectrum compression of reception device
Module carries out signal recovery to the chaotic signal inverse transformation received, is divided into two-way by the first photo-coupler OC1；All the way through
One photoelectric detector PD 1 is converted into electric signal and recovered for signal；Another road enters semiconductor laser through optoisolator IO
SSL, reflected mirror M formation backfeed loop, completes chaotic signal synchronization；Chaos laser after synchronization exports optical signal through second
Photoelectric detector PD 2 is converted to electric signal and recovered for signal；Reception device is used for signal after two-way in system is changed through PD
The electric signal of recovery obtains demodulated signal m'(t through subtracter).
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