CN109547151A - Two-way chaotic secret communication system and communication means based on TWDM-PON - Google Patents
Two-way chaotic secret communication system and communication means based on TWDM-PON Download PDFInfo
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- CN109547151A CN109547151A CN201910025139.4A CN201910025139A CN109547151A CN 109547151 A CN109547151 A CN 109547151A CN 201910025139 A CN201910025139 A CN 201910025139A CN 109547151 A CN109547151 A CN 109547151A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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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
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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Abstract
The invention discloses a kind of two-way chaotic secret communication system and communication means based on TWDM-PON; it is to be injected into a branch of continuous laser with exocoel directional scatter feedback without in the more longitudinal mode semiconductor lasers of isolator, realizes the video stretching of no-delay feature multimode chaotic laser light；Light is divided into multichannel by multichannel optical splitter, and three one group of tunnels are grouped, and every group loads transmission demodulation part and reversed multiline message load transmission demodulation part with positive multiline message and connect；It is separated with wavelength division multiplexer by longitudinal-mode wavelength, the chaotic laser light carrier wave as multichannel communication multiple telecommunication；Every tri- road light of Zu forms two closed loop configurations, is respectively used to realize positive and reversed multiline message load transmission demodulation.The two-way secret communication of multi-user not only may be implemented in the present invention, but also can load the information of high speed, is greatly improved the quantity of user, meets the demand of user.
Description
Technical field
The present invention relates to the broadband chaotic laser light communications field, specially a kind of two-way chaotic secret based on TWDM-PON is logical
Letter system and communication means can be used for chaotic laser light wavelength-division multiplex secret communication.
Background technique
Chaotic laser light has the characteristics such as sensitive initial value, unpredictable, wide spectrum, high-energy, makes it in information security field
With critically important application.For example, chaotic secret communication, generation of High-Speed True Random Bit generation etc..In the research of chaotic secret communication,
People are successfully realized all the way in succession using chaotic laser light broadband, significantly characteristic is applied to chaos light secrecy transmission
Unidirectional information rate is 1Gb/s [Nature, Vol. 17, p. 348,2005], 2.5 Gb/s [Opt. Express,
Vol. 18, p. 5188-5198,2010] and 10Gb/s [IEEE J. Quantum Electron., Vol. 46, p.
1430-1435,2010] secrecy transmission.To realize that the information privacy transmission of high speed usually requires the chaotic laser light in building broadband
It is synchronous, however synchronizing for broadband chaotic laser light is difficult to realize, and influence of the broadband chaotic laser light vulnerable to fibre-optical dispersion, so that together
Walk quality degradation, and then introduce noise enable the signal-to-noise ratio of demodulating information reduce [J. Lightwave Technol., Vol. 28,
p. 2688, 2010].One is realized on the synchronous chaotic laser light of 10GHz bandwidth using binary format modulation researcher
Road unidirectionally loads the information transmission [Opt. Lett., Vol. 43, p. 1323-1326,2018] of 30Gb/s.
In practical communication system, legitimate correspondence both sides not only need one-way communication, it can be more desirable to which two-way safety is logical
Letter.Initially building intercommunication system is using the synchronous realizations of two laser mutual couplings, but Chaotic Synchronous is not under the structure
Stablize, more demanding to laser parameter and stiffness of coupling [Phys. Rev. Lett., Vol. 86, p. 795-798,
2001].Therefore, symmetrical exocoel mirror feedback is added on the basis of mutual coupling laser in subsequent research, compared with
Chaotic laser light exports [Phys. Rev. E, Vol. 73, p. whens can be realized stable equal within the scope of big feedback-coupling parameter
066214, 2006].It is equally based on mutual coupling mirror feedback structure, the two-way communication of three users has appeared in the newspapers [Opt.
Comm. Vol. 423, p. 155-161, 2018].For the load for realizing high speed information, the chaotic laser light in building broadband is still needed to
It is synchronous.On the basis of mutual coupling laser, while a branch of chaotic laser light is injected, the bandwidth of synchronous chaos laser can be broadened, it is real
Existing 10Gb/s information transmission [Nolinear Dyn., Vol. 76, p. 399-407,2014].Utilize common chaotic laser light
Driving two synchronous without isolator semiconductor laser, and constructs other one optical fiber for information transmission, can also realize two
The two-way 10Gb/s of a user communicates [J. Lightwave Technol., Vol. 31, p. 461-467,2013].
In conclusion realize information it is single, double to the prerequisite of secrecy transmission be transmitting in chaotic communication system and connect
Receipts system generates the synchronous chaotic laser light of high quality simultaneously.The bandwidth of chaotic laser light used decides information when for load information
Loading velocity, therefore practical application carry out high-rate information transmission in hardware, more stringent requirements are proposed, it usually needs 3 swash
Light device [Nolinear Dyn., Vol. 76, p. 399-407,2014, J. Lightwave Technol., Vol.
31, p. 461-467, 2013, Opt. Lett., Vol. 43, p. 1323-1326, 2018].In addition to chaotic laser light
Bandwidth decides outside the loading speed of information that the exocoel delay characteristics of chaotic laser light itself directly affect the safety of system.For
The exocoel delay characteristics for eliminating chaotic laser light, common practice is to introduce more complicated exocoel in chaotic laser light communication system
Feedback arrangement [Opt. Commun., Vol. 352, p. 77-83,2015, Opt. Lett., Vol. 41, p. 3690,
2016].Complicated external cavity feedback structure not only increases the realization difficulty in practical application, can also introduce error, reduces demodulation letter
The signal-to-noise ratio [Opt. Commun., Vol. 352, p. 77-83,2015] of breath.Reported two-way multichannel chaotic laser light is protected
Close communication also needs 3 sublasers and relies on the synchronization of chaotic laser light, and every road information loading speed is only 2Gb/s
[Nonlinear Dyn., Vol. 86, p. 1937-1949, 2016].Independence is respectively enjoyed based on information load and information transmission
The thought of channel, nearest researcher propose a kind of only to need one to regulate and control random light feedback with number to swash without isolator semiconductor
Light device realizes two user's two-way communications [Photon. J., Vol. 10, p. 7908308].Though the program produces nothing
The chaotic laser light of delay characteristics and without driving two telecommunication laser Chaotic Synchronous to remove load information, but for the mixed of communication
Ignorant laser frequency spectrum width does not have the information rate for realizing transmission compared with quantum jump not break through 10 Gb/s yet, is unable to satisfy existing letter
Cease transmission plan in 3km, 10km, 40km short-distance and medium-distance traffic rate, that is, 25Gb/s requirement [Chin. Opt. Lett.,
Vol. 15, p. 022502, 2017]。
Although in a communications system, dense wave division multipurpose (WDM-PON) can be improved the bandwidth of user, it is constrained to
The limitation of WDM wavelength-division number is still unable to satisfy the high speed secret communication demand of current a large number of users.Therefore in order to can be very big
Promotion user quantity, need the communication system of a kind of pair of dense wave division multipurpose (WDM-PON) to improve, allow to full
The demand of sufficient a large number of users.
Summary of the invention
For the present invention in order to solve in current chaotic secret communication system, dense wave division multipurpose (WDM-PON) can be improved use
The bandwidth at family, but it is constrained to the limitation of WDM wavelength-division number, the high speed secret communication for being still unable to satisfy current a large number of users needs
The problem of asking provides a kind of two-way chaotic secret communication system and communication means based on TWDM-PON.
The present invention is achieved by the following technical solution: a kind of two-way chaotic secret communication system based on TWDM-PON
System, it is characterised in that: inject part including the light that ultra wide band chaotic laser generates, generated without delay characteristics multi-wavelength chaotic laser light
Partially, positive multiline message load transmission demodulation part, reversed multiline message load transmission demodulation part；
The light injection unit point that the ultra wide band chaotic laser generates includes single mode band isolator semiconductor laser with tunable wavelength,
The single mode is connect with isolator semiconductor laser with tunable wavelength output end with the input terminal of the first optical amplification device, and first
The output end of optical amplification device is connect with the first optical fiber polarization controller input terminal, the output end of the first optical fiber polarization controller with
The first input end of one 1 × 2nd 50:50 coupler connects, the one 1 × 2nd 50:50 coupler output and the first ring of light shape
The first port of device connects；
The no delay characteristics multi-wavelength chaotic laser light generating unit point includes the more longitudinal mode semiconductor lasers of no isolator, the nothing
The more longitudinal mode semiconductor laser output ends of isolator are connect with the second port of the first optical circulator, the third of the first optical circulator
Port is connect with the input terminal of the second optical amplification device, the output end of the second optical amplification device and the first optical fiber polarization controller
Input terminal connection, the output end of the first optical fiber polarization controller are connect with the second optical circulator first port, the second optical circulator
Second port is connected with directional scatter input terminal, the second optical circulator third port with the one 1 × 2nd 50:50 coupler second
Input terminal connection, directional scatter output end are connected with the first optoisolator input terminal, the first optoisolator output end and third light
The input terminal of amplifying device connects；
The output end of the third optical amplification device and the input terminal of TDM-PON connect, and the TDM-PON is multichannel optical splitter,
There are multiple output ends, every three adjacent output ends form N group as one group, and each group loads transmission with positive multiline message
Demodulation part loads transmission demodulation part with reversed multiline message and connects；
Forward direction multiline message load transmission demodulation part includes the second optoisolator, in the output end of TDM-PON, every group
First output end is connect with the second optoisolator input terminal, and the second optoisolator output end and the first wavelength division multiplexer input terminal connect
It connects, the first wavelength division multiplexer output end is connect with first information encoder input terminal, first information encoder output and second
The connection of wavelength division multiplexer input terminal, the second wavelength division multiplexer output end are connect with the first optic fibre input end, the first fiber-optic output
It being connect with third wavelength division multiplexer input terminal, third wavelength division multiplexer output end is connect with the first photodetector input terminal, the
One photodetector output end is connect with first information decoder input, and first information decoder input and the second photoelectricity are visited
Survey the connection of device output end；The second output terminal that every group of TDM-PON is connect with the second optic fibre input end, the second fiber-optic output and
21 × 2 50:50 coupler input connection, the 21 × 2nd the first output end of 50:50 coupler and third optoisolator are defeated
Enter end connection, third optoisolator output end connect with the 4th wavelength division multiplexer input terminal, the 4th wavelength division multiplexer output end and
The connection of second photodetector input terminal；
It include the 4th optoisolator, the described 21 × 2nd 50:50 coupling in the reversed multiline message load transmission demodulation part
Clutch second output terminal is connect with the 4th optoisolator input terminal, and the 4th optoisolator output end and the 5th wavelength division multiplexer input
End connection, the 5th wavelength division multiplexer output end connect with the second info encoder input terminal, the second info encoder output end and
The connection of 6th wavelength division multiplexer input terminal, the 6th wavelength division multiplexer output end are connect with third optic fibre input end, and third optical fiber is defeated
Outlet is connect with the 7th wavelength division multiplexer input terminal, and the 7th wavelength division multiplexer output end and third photodetector input terminal connect
It connects, third photodetector output end is connect with the second info decoder input terminal, the second info decoder input terminal and the 4th
The connection of photodetector output end, the third output end of TDM-PON are connect with the 5th optoisolator input terminal, the 5th optoisolator
Output end is connect with the 4th optic fibre input end, and the 4th fiber-optic output is connect with the 8th wavelength division multiplexer input terminal, the 8th wavelength-division
Multiplexer output terminal is connect with the 4th photodetector input terminal.
The communication means of two-way chaotic secret communication system based on TWDM-PON, specifically: without the more longitudinal modes of isolator half
Conductor laser receives two-beam by the first optical circulator, wherein a branch of from single mode band isolator tunable wave length half
The injection light of conductor laser, another beam from directional scatter feedback light, to generate multi-wavelength, without delay characteristics, frequency
The chaotic laser light of spectrum widening；First, second optical amplification device and the first, second optical fiber polarization controller be respectively used to injection light and
Feed back the regulation of luminous intensity, the multi-wavelength of generation, chaotic laser light without delay characteristics, video stretching by the first optoisolator,
Third optical amplification device, TDM-PON, are divided into the chaotic laser light on one group of three tunnel of multi beam, the chaotic laser light of mono- group of every Shu Sanlu its
In all the way chaotic laser light be used as the light source of positive information transmission；The second road chaotic laser light is by the second optical fiber and the 21 × 2nd
50:50 coupler is divided into two-way again, all the way the demodulation for positive information, the light source that another way is transmitted as reversed information；The
Three road chaotic laser lights are used as the demodulation of reversed information；
1. first via chaotic laser light after the second optoisolator enter first wave division multiplexer by multi-wavelength chaotic laser light according to
The wavelength of the no more each subpatterns of longitudinal mode semiconductor laser of isolator separates, different mixed of the wavelength that gets, spectral bandwidth
Ignorant laser is loaded into each road using first information encoder as carrier wave, according to the width of each wavelength chaotic laser light frequency spectrum simultaneously
Each wavelength chaotic laser light is merged into a branch of, process using the second wavelength division multiplexer by the information of chaotic laser light different rates
Reach the third wavelength division multiplexer of receiving end after the transmission of first optical fiber；Third wavelength division multiplexer is by the multi-wavelength chaos of carrying information
Laser is separated according to the wavelength of the more each subpatterns of longitudinal mode semiconductor laser of no isolator, obtains obtaining multichannel chaotic laser light process
First photodetector converts optical signals to electric signal；
2. the second road chaotic laser light by the second optical fiber and the 21 × 2nd 50:50 coupler after be divided into two-way, wherein mixing all the way
Ignorant laser enters receiving end through third optoisolator and obtains electric signal through the 4th wavelength division multiplexer and the second photodetector again；Benefit
Above-mentioned two electric signal is carried out with first information decoder to subtract each other processing, so that it may extract the different rates of transmitting terminal load
Information realizes the safe and secret transmission of positive multichannel rate difference information；Second road chaotic laser light passes through the second optical fiber and the 2nd 1
The another way chaotic laser light that × 2 50:50 coupler obtains is used for the light source of reversed information transmission, laggard through the 4th optoisolator
Enter wave of the 5th wavelength division multiplexer by multi-wavelength chaotic laser light according to the more each subpatterns of longitudinal mode semiconductor laser of no isolator
The different chaotic laser light of the long wavelength separately, got, spectral bandwidth is as carrier wave, according to each wavelength chaotic laser light frequency spectrum
Width is loaded into the information of each road chaotic laser light different rates using the second info encoder simultaneously, using the 6th wavelength-division multiplex
Each wavelength chaotic laser light is merged into a branch of by device, reaches the 7th wavelength division multiplexer of receiving end after the transmission of third optical fiber；
7th wavelength division multiplexer is by the multi-wavelength chaotic laser light of carrying information according to the more each height of longitudinal mode semiconductor laser of no isolator
The wavelength of mode separates, and obtained multichannel chaotic laser light converts optical signals to electric signal by third photodetector；
3. third road chaotic laser light enters receiving end through the 5th optoisolator and the 4th optical fiber and passes through for the demodulation for realizing reversed information
8th wavelength division multiplexer and the 4th photodetector are converted to electric signal；Using the second info decoder by above-mentioned two electric signal
It carries out subtracting each other processing, so that it may which the information for extracting the different rates of transmitting terminal load realizes reversed multichannel rate difference information
Safe and secret transmission.
The working principle of the invention includes:
1. can be generated when by being fed back from directional scatter without the more longitudinal mode semiconductor lasers of isolator matched with its longitudinal mode
The chaotic laser light of multiple wavelength can generate a large amount of random outer cavity molds due to feeding back at random, enable multi-wavelength chaotic laser light without outer
Chamber delay characteristics, that is, the chaotic laser light of multi-wavelength (mould) without delay characteristics.
2. multi-wavelength can be enabled without the chaotic laser light of exocoel delay characteristics under the laser injection of tunable laser
Video stretching, and one and the matched ultra wide band of injection optical maser wavelength, the chaotic laser light without exocoel delay characteristics can be generated.
When the output wavelength of adjusting wavelength tunable laser is allowed to deposit with the wavelength of a mould in no isolator Multi-Longitudinal Mode laser
In the frequency detuning of 15GHz-30GHz, the beat frequency of injection light and chaotic laser light can be caused, and then excite the chaos of the mode
Laser frequency spectrum is broadened to 25GHz-40GHz, and different wave length chaotic laser light spectral bandwidth corresponding to remaining mode can maintain
5GHz-8GHz.One of mould of the single-mode laser and Multi-Longitudinal Mode laser that are issued the present invention claims Wavelength tunable laser
Frequency detuning be 25GHz-40GHz.Rate for the wide range feature for making full use of chaotic laser light, information load can be according to mixed
Ignorant laser frequency spectrum bandwidth and select, the present invention claims the rate of each info encoder load information be less than carrying its used in mix
The spectral bandwidth of ignorant laser.
3. light is divided into multichannel by third optical amplification device and TDM-PON, multichannel optical path uses one group of three tunnel again, point
For multiple groups, every group transmits demodulation section with respective positive multiline message load transmission demodulation part and the load of reversed multiline message
Divide connection；By the multiple wavelength of the group and the chaotic laser light without exocoel delay characteristics is divided into three tunnels by two couplers and forms two
Closed loop, one of closed loop can realize positive multiline message load transmission demodulation, another closed loop is believed for realizing reversed multichannel
Breath load transmission demodulation.To realize information demodulation, the present invention claims information transmission fiber and the optical fiber into information receiving end are long
Degree is consistent, that is, positive information transmission fiber and positive consistent into information receiving end fiber lengths, i.e. the first optical fiber and the
Two fiber lengths are equal.What it is due to composition is two closed loop configurations, that is, is used for transmission the positive chaotic laser light of demodulation and is sent to
The chaotic laser light of reversed receiving end shares an optical fiber (the second optical fiber), and furthermore information will also be by length and the when reverse link communication
One, the equal third optical fiber transmission of the second optical fiber reaches communication party, and this requires the chaotic laser lights demodulated for information to enter
The 4th optical fiber by one section of 2 times of information transmission fibers (third optical fiber) length is needed before reversed receiving end, to realize to reversed
Transmit the demodulation of information.
Compared with prior art the invention has the following advantages: the present invention provide it is a kind of based on the two-way of TWDM-PON
The two-way secret communication of multi-user not only may be implemented in chaotic secret communication system and communication means compared with prior art, and
And the information of high speed can be loaded.Its advantage is embodied a concentrated reflection of with good effect:
One, the multi-wavelength chaotic laser light without delay characteristics that the present invention generates enhances the safety of information transmission.Due to generating
Multi-wavelength chaotic laser light spectrum width different (maximum spectrum bandwidth is up to 40GHz) the different rates of information throughput can be met
Requirement, the difference for transmitting information rate also will increase the difficulty of listener-in's steal information, further ensures information transmission
Safety.
Two, in the communication system that the present invention constructs, TWDM-PON can not only be greatly improved the quantity of user, but also
It can be realized the secret communication between user.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
It is marked in figure as follows: 1- single mode band isolator semiconductor laser with tunable wavelength in figure, the first light amplification of 2- dress
Set, the first optical fiber polarization controller of 3-, the 50:50 coupler of 4- the one 1 × 2nd, 5- without the more longitudinal mode semiconductor lasers of isolator,
The first optical circulator of 6-, the second optical amplification device of 7-, the second optical fiber polarization controller of 8-, the second optical circulator of 9-, the random light of 10-
Grid, the first optoisolator of 11-, 12- third optical amplification device, the second optoisolator of 13-TDM-PON, 14-, the first wavelength-division of 15- are multiple
With device, 16- first information encoder, the second wavelength division multiplexer of 17-, the first optical fiber of 18-, 19- third wavelength division multiplexer, 20-
One photodetector, 21- first information decoder, the second photodetector of 22-, the 4th wavelength division multiplexer of 23-, 24- third light
Isolator, the 50:50 coupler of 25- the 21 × 2nd, the second optical fiber of 26-, the 4th optoisolator of 27-, the 5th wavelength-division multiplex of 28-
Device, the second info encoder of 29-, the 6th wavelength division multiplexer of 30-, 31- third optical fiber, the 7th wavelength division multiplexer of 32-, 33- third
Photodetector, the second info decoder of 34-, the 4th photodetector of 35-, the 8th wavelength division multiplexer of 36-, the 4th optical fiber of 37-,
The 5th optoisolator of 38-.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
A kind of two-way chaotic secret communication system based on TWDM-PON, as shown in Figure 1, including that ultra wide band chaotic laser produces
Raw light injection partially, without delay characteristics multi-wavelength chaotic laser light generates part, demodulation part is transmitted in positive multiline message load,
Reversed multiline message load transmission demodulation part；
The light injection unit point that the ultra wide band chaotic laser generates includes single mode band isolator semiconductor laser with tunable wavelength
1, the single mode is connect with 1 output end of isolator semiconductor laser with tunable wavelength with the input terminal of the first optical amplification device 2,
The output end of first optical amplification device 2 is connect with 3 input terminal of the first optical fiber polarization controller, the first optical fiber polarization controller 3
Output end is connect with the first input end of the one 1 × 2nd 50:50 coupler 4, the one 1 × 2nd 4 output end of 50:50 coupler with
The first port of first optical circulator 6 connects；
The no delay characteristics multi-wavelength chaotic laser light generating unit point includes the more longitudinal mode semiconductor lasers 5 of no isolator, described
No more 5 output ends of longitudinal mode semiconductor laser of isolator are connect with the second port of the first optical circulator 6, the first optical circulator 6
Third port connect with the input terminal of the second optical amplification device 7, the output end and the first optical fiber polarisation of the second optical amplification device 7
The input terminal of controller 8 connects, and the output end of the first optical fiber polarization controller 8 is connect with 9 first port of the second optical circulator, the
Two optical circulators, 9 second port is connected with 10 input terminal of directional scatter, 9 third port of the second optical circulator and the one 1 × 2nd
The connection of 4 second input terminal of 50:50 coupler, 10 output end of directional scatter are connected with 11 input terminal of the first optoisolator, the first light
11 output end of isolator is connect with the input terminal of third optical amplification device 12；
The output end of the third optical amplification device 12 and the input terminal of TDM-PON13 connect, and the TDM-PON13 is multichannel point
Light device has multiple output ends, and every three adjacent output ends form N group as one group, and each group loads with positive multiline message
Transmission demodulation part loads transmission demodulation part with reversed multiline message and connects；
Forward direction multiline message load transmission demodulation part includes the second optoisolator 14, in the output end of TDM-PON13, often
First output end of group is connect with 14 input terminal of the second optoisolator, 14 output end of the second optoisolator and the first wavelength division multiplexer
The connection of 15 input terminals, 15 output end of the first wavelength division multiplexer are connect with 16 input terminal of first information encoder, first information coding
16 output end of device is connect with 17 input terminal of the second wavelength division multiplexer, and 17 output end of the second wavelength division multiplexer and the first optical fiber 18 input
End connection, 18 output end of the first optical fiber connect with 19 input terminal of third wavelength division multiplexer, 19 output end of third wavelength division multiplexer and
The connection of first photodetector, 20 input terminal, 20 output end of the first photodetector and 21 input terminal of first information decoder connect
It connects, 21 input terminal of first information decoder is connect with 22 output end of the second photodetector；Every group of TDM-PON13 of the second output
End is connect with 26 input terminal of the second optical fiber, and 26 output end of the second optical fiber is connect with the 21 × 2nd 25 input terminal of 50:50 coupler,
21 × 2nd 25 first output end of 50:50 coupler is connect with 24 input terminal of third optoisolator, and third optoisolator 24 is defeated
Outlet is connect with 23 input terminal of the 4th wavelength division multiplexer, and 23 output end of the 4th wavelength division multiplexer and the second photodetector 22 input
End connection；
It include the 4th optoisolator 27, the 21 × 2nd 50:50 in the reversed multiline message load transmission demodulation part
25 second output terminal of coupler is connect with 27 input terminal of the 4th optoisolator, and 27 output end of the 4th optoisolator and the 5th wavelength-division are multiple
It is connected with 28 input terminal of device, 28 output end of the 5th wavelength division multiplexer is connect with 29 input terminal of the second info encoder, the second information
29 output end of encoder is connect with 30 input terminal of the 6th wavelength division multiplexer, 30 output end of the 6th wavelength division multiplexer and third optical fiber 31
Input terminal connection, 31 output end of third optical fiber are connect with 32 input terminal of the 7th wavelength division multiplexer, the output of the 7th wavelength division multiplexer 32
End is connect with 33 input terminal of third photodetector, 34 input terminal of 33 output end of third photodetector and the second info decoder
Connection, 34 input terminal of the second info decoder are connect with 35 output end of the 4th photodetector, the third output end of TDM-PON13
It is connect with 38 input terminal of the 5th optoisolator, 38 output end of the 5th optoisolator is connect with 37 input terminal of the 4th optical fiber, the 4th light
Fine 37 output ends are connect with 36 input terminal of the 8th wavelength division multiplexer, 36 output end of the 8th wavelength division multiplexer and the 4th photodetector
The connection of 35 input terminals.
In the present embodiment, adjust output wavelength of the single mode with isolator semiconductor laser with tunable wavelength 1 with without being isolated
There are the frequency detunings of 15GHz-30GHz for the wavelength of a mode in the more longitudinal mode semiconductor lasers 5 of device；Each information is compiled
The rate of code device load information is less than the spectral bandwidth for carrying its chaotic laser light used；First, second, third optical fiber 18,26,31
Equal length and be 37 length of the 4th optical fiber half；The TDM-PON 13 uses 32 tunnels, 64 tunnels or No. 128 optical splitters,
The present embodiment uses No. 64 optical splitters, then forms 21 groups.
The communication means of the two-way chaotic secret communication system based on TWDM-PON of the present embodiment, specifically: without isolation
The more longitudinal mode semiconductor lasers 5 of device receive two-beam by the first optical circulator 6, wherein a branch of from single mode band isolator
The injection light of semiconductor laser with tunable wavelength 1, another beam from directional scatter 10 feedback light, to generate more waves
The long, chaotic laser light without delay characteristics, video stretching；First, second optical amplification device 2,7 and the first, second optical fiber polarisation control
Device 3,8 processed is respectively used to injection light and feeds back the regulation of luminous intensity, the multi-wavelength of generation, without delay characteristics, video stretching it is mixed
Ignorant laser passes through the first optoisolator 11, third optical amplification device 12, TDM-PON13, and the chaos for being divided into one group of three tunnel of multi beam swashs
Light, the light source that wherein chaotic laser light is transmitted as positive information all the way of the chaotic laser light of mono- group of every Shu Sanlu；Second tunnel chaos
Laser is divided into two-way again by the 50:50 coupler 25 of the second optical fiber the 26 and the 21 × 2nd, all the way the demodulation for positive information,
The light source that another way is transmitted as reversed information；Third road chaotic laser light is used as the demodulation of reversed information；
1. first via chaotic laser light enters first wave division multiplexer 15 for multi-wavelength chaotic laser light after the second optoisolator 14
It is separated according to the wavelength of each subpattern of the more longitudinal mode semiconductor lasers 5 of no isolator, the wavelength that gets, spectral bandwidth are different
Chaotic laser light as carrier wave, loaded simultaneously according to the width of each wavelength chaotic laser light frequency spectrum using first information encoder 16
To the information of each road chaotic laser light different rates, each wavelength chaotic laser light is merged into one using the second wavelength division multiplexer 17
Beam reaches the third wavelength division multiplexer 19 of receiving end after the transmission of the first optical fiber 18；Third wavelength division multiplexer 19 will be loaded with letter
The multi-wavelength chaotic laser light of breath is separated according to the wavelength of each subpattern of the more longitudinal mode semiconductor lasers 5 of no isolator, is obtained
Multichannel chaotic laser light converts optical signals to electric signal by the first photodetector 20；
2. the second road chaotic laser light is divided into two-way after the 50:50 coupler 25 of the second optical fiber the 26 and the 21 × 2nd, wherein one
Road chaotic laser light is obtained through the 4th wavelength division multiplexer 23 and the second photodetector 22 through third optoisolator 24 into receiving end again
Obtain electric signal；Above-mentioned two electric signal is carried out using first information decoder 21 to subtract each other processing, so that it may extract transmitting terminal and add
The information of the different rates of load realizes the safe and secret transmission of positive multichannel rate difference information；Second road chaotic laser light passes through
The another way chaotic laser light that the 50:50 coupler 25 of second optical fiber the 26 and the 21 × 2nd obtains is used for the light of reversed information transmission
Source enters the 5th wavelength division multiplexer 28 for multi-wavelength chaotic laser light according to the more longitudinal modes of no isolator half after the 4th optoisolator 27
The wavelength of each subpattern of conductor laser 5 separates, the different chaotic laser light of the wavelength that gets, spectral bandwidth as carrier wave,
It is loaded into each road chaotic laser light difference simultaneously using the second info encoder 29 according to the width of each wavelength chaotic laser light frequency spectrum
The information of rate, each wavelength chaotic laser light is merged into using the 6th wavelength division multiplexer 30 it is a branch of, by third optical fiber 31
Reach the 7th wavelength division multiplexer 32 of receiving end after transmission；7th wavelength division multiplexer 32 is by the multi-wavelength chaotic laser light of carrying information
It is separated according to the wavelength of each subpattern of the more longitudinal mode semiconductor lasers 5 of no isolator, obtained multichannel chaotic laser light is by the
Three photodetectors 33 convert optical signals to electric signal；
3. third road chaotic laser light enters through the 5th optoisolator 38 and the 4th optical fiber 37 to be received for the demodulation for realizing reversed information
End is converted to electric signal through the 8th wavelength division multiplexer 36 and the 4th photodetector 35；It will be above-mentioned using the second info decoder 34
Two electric signals carry out subtracting each other processing, so that it may which the information for extracting the different rates of transmitting terminal load realizes reversed multichannel rate
The safe and secret transmission of different information.
The scope of protection of present invention is not limited to the above specific embodiment, and for those skilled in the art and
Speech, the present invention can there are many deformation and change, it is all within design and principle of the invention it is made it is any modification, improve and
Equivalent replacement should be all included within protection scope of the present invention.
Claims (6)
1. a kind of two-way chaotic secret communication system based on TWDM-PON, it is characterised in that: produced including ultra wide band chaotic laser
Raw light injection partially, without delay characteristics multi-wavelength chaotic laser light generates part, demodulation part is transmitted in positive multiline message load,
Reversed multiline message load transmission demodulation part；
The light injection unit point that the ultra wide band chaotic laser generates includes single mode band isolator semiconductor laser with tunable wavelength
(1), input of the single mode with isolator semiconductor laser with tunable wavelength (1) output end and the first optical amplification device (2)
End connection, the output end of the first optical amplification device (2) are connect with the first optical fiber polarization controller (3) input terminal, and the first optical fiber is inclined
The output end of vibration controller (3) is connect with the first input end of the one 1 × 2nd 50:50 coupler (4), the one 1 × 2nd 50:50
Coupler (4) output end is connect with the first port of the first optical circulator (6)；
The no delay characteristics multi-wavelength chaotic laser light generating unit point includes the more longitudinal mode semiconductor lasers (5) of no isolator, institute
It states more longitudinal mode semiconductor laser (5) output ends of no isolator to connect with the second port of the first optical circulator (6), first ring of light
The third port of shape device (6) is connect with the input terminal of the second optical amplification device (7), the output end of the second optical amplification device (7) with
The input terminal of first optical fiber polarization controller (8) connects, the output end and the second optical circulator of the first optical fiber polarization controller (8)
(9) first port connects, and the second optical circulator (9) second port is connected with directional scatter (10) input terminal, the second optical circulator
(9) third port is connect with the one 1 × 2nd (4) second input terminal of 50:50 coupler, directional scatter (10) output end and first
Optoisolator (11) input terminal is connected, and the input terminal of the first optoisolator (11) output end and third optical amplification device (12) connects
It connects；
The output end and TDM-PON(13 of the third optical amplification device (12)) input terminal connection, the TDM-PON(13) be
Multichannel optical splitter has multiple output ends, and every three adjacent output ends form N group as one group, and each group is believed with positive multichannel
Breath load transmission demodulation part loads transmission demodulation part with reversed multiline message and connects；
It is described forward direction multiline message load transmission demodulation part include the second optoisolator (14), TDM-PON(13) output end
In, every group of the first output end is connect with the second optoisolator (14) input terminal, the second optoisolator (14) output end and first
The connection of wavelength division multiplexer (15) input terminal, the first wavelength division multiplexer (15) output end and first information encoder (16) input terminal connect
It connects, first information encoder (16) output end is connect with the second wavelength division multiplexer (17) input terminal, the second wavelength division multiplexer (17)
Output end is connect with the first optical fiber (18) input terminal, and the first optical fiber (18) output end and third wavelength division multiplexer (19) input terminal connect
It connects, third wavelength division multiplexer (19) output end is connect with the first photodetector (20) input terminal, the first photodetector (20)
Output end is connect with first information decoder (21) input terminal, first information decoder (21) input terminal and the second photodetector
(22) output end connects；TDM-PON(13) every group of second output terminal is connect with the second optical fiber (26) input terminal, the second optical fiber
(26) output end is connect with the 21 × 2nd 50:50 coupler (25) input terminal, the 21 × 2nd 50:50 coupler (25) first
Output end is connect with third optoisolator (24) input terminal, third optoisolator (24) output end and the 4th wavelength division multiplexer (23)
Input terminal connection, the 4th wavelength division multiplexer (23) output end are connect with the second photodetector (22) input terminal；
Including the 4th optoisolator (27) in the reversed multiline message load transmission demodulation part, the 50 of the described 21 × 2nd:
50 couplers (25) second output terminal is connect with the 4th optoisolator (27) input terminal, the 4th optoisolator (27) output end and
The connection of five wavelength division multiplexers (28) input terminal, the 5th wavelength division multiplexer (28) output end and the second info encoder (29) input terminal
Connection, the second info encoder (29) output end are connect with the 6th wavelength division multiplexer (30) input terminal, the 6th wavelength division multiplexer
(30) output end is connect with third optical fiber (31) input terminal, and third optical fiber (31) output end and the 7th wavelength division multiplexer (32) input
End connection, the 7th wavelength division multiplexer (32) output end are connect with third photodetector (33) input terminal, third photodetector
(33) output end is connect with the second info decoder (34) input terminal, and the second info decoder (34) input terminal and the 4th photoelectricity are visited
Survey device (35) output end connection, TDM-PON(13) third output end connect with the 5th optoisolator (38) input terminal, the 5th light
Isolator (38) output end is connect with the 4th optical fiber (37) input terminal, the 4th optical fiber (37) output end and the 8th wavelength division multiplexer
(36) input terminal connects, and the 8th wavelength division multiplexer (36) output end is connect with the 4th photodetector (35) input terminal.
2. the two-way chaotic secret communication system according to claim 1 based on TWDM-PON, it is characterised in that: adjust single
Output wavelength of the mould with isolator semiconductor laser with tunable wavelength (1) and the more longitudinal mode semiconductor lasers (5) of no isolator
In the wavelength of a mode there are the frequency detunings of 15GHz-30GHz.
3. the two-way chaotic secret communication system according to claim 1 based on TWDM-PON, it is characterised in that: Ge Gexin
The rate for ceasing encoder load information is less than the spectral bandwidth for carrying its chaotic laser light used.
4. the two-way chaotic secret communication system according to claim 1 based on TWDM-PON, it is characterised in that: first,
The equal length of second, third optical fiber (18,26,31) and be the 4th optical fiber (37) length half.
5. the two-way chaotic secret communication system according to claim 1 based on TWDM-PON, it is characterised in that: described
TDM-PON (13) uses 32 tunnels, 64 tunnels or No. 128 optical splitters.
6. the communication means of the two-way chaotic secret communication system described in claim 1 based on TWDM-PON, it is characterised in that:
The no more longitudinal mode semiconductor lasers (5) of isolator receive two-beam by the first optical circulator (6), wherein a branch of from list
Injection light of the mould with isolator semiconductor laser with tunable wavelength (1), another beam from directional scatter (10) feedback light,
To generate multi-wavelength, the chaotic laser light without delay characteristics, video stretching；First, second optical amplification device (2,7) and first,
Second optical fiber polarization controller (3,8) be respectively used to injection light and feed back luminous intensity regulation, the multi-wavelength of generation, without time delay spy
Levy, the chaotic laser light of video stretching passes through the first optoisolator (11), third optical amplification device (12), TDM-PON(13), it is divided into
The chaotic laser light on one group of three tunnel of multi beam, the chaotic laser light of mono- group of every Shu Sanlu wherein chaotic laser light is used as positive information and passes all the way
Defeated light source；Second road chaotic laser light is divided into two-way by the 50:50 coupler (25) of the second optical fiber (26) and the 21 × 2nd again,
Demodulation for positive information all the way, the light source that another way is transmitted as reversed information；Third road chaotic laser light is used as reversed letter
The demodulation of breath；
1. first via chaotic laser light enters first wave division multiplexer (15) for multi-wavelength chaos after the second optoisolator (14)
Laser is separated according to the wavelength of each subpattern of the more longitudinal mode semiconductor lasers (5) of no isolator, wavelength, the spectral band got
The different chaotic laser light of width utilizes first information encoder (16) as carrier wave, according to the width of each wavelength chaotic laser light frequency spectrum
It is loaded into the information of each road chaotic laser light different rates simultaneously, swashs each wavelength chaos using the second wavelength division multiplexer (17)
Light is merged into a branch of, reaches the third wavelength division multiplexer (19) of receiving end after the first optical fiber (18) transmission；Third wavelength-division is multiple
With device (19) by the multi-wavelength chaotic laser light of carrying information according to each subpattern of the more longitudinal mode semiconductor lasers (5) of no isolator
Wavelength separate, obtain multichannel chaotic laser light converts optical signals to electric signal by the first photodetector (20)；
2. the second road chaotic laser light by the second optical fiber (26) and the 21 × 2nd 50:50 coupler (25) after be divided into two-way,
In all the way chaotic laser light through third optoisolator (24) enter receiving end again through the 4th wavelength division multiplexer (23) and the second photoelectricity spy
It surveys device (22) and obtains electric signal；Above-mentioned two electric signal is carried out to subtract each other processing using first information decoder (21), so that it may mention
The information for taking out the different rates of transmitting terminal load realizes the safe and secret transmission of positive multichannel rate difference information；Second tunnel
The another way chaotic laser light that chaotic laser light is obtained by the 50:50 coupler (25) of the second optical fiber (26) and the 21 × 2nd is for anti-
The light source transmitted to information enters the 5th wavelength division multiplexer (28) after the 4th optoisolator (27) and presses multi-wavelength chaotic laser light
It is separated according to the wavelength of each subpattern of the more longitudinal mode semiconductor lasers (5) of no isolator, the wavelength that gets, spectral bandwidth are different
Chaotic laser light as carrier wave, added simultaneously according to the width of each wavelength chaotic laser light frequency spectrum using the second info encoder (29)
It is downloaded to the information of each road chaotic laser light different rates, merges each wavelength chaotic laser light using the 6th wavelength division multiplexer (30)
At a branch of, the 7th wavelength division multiplexer (32) of receiving end is reached after third optical fiber (31) transmission；7th wavelength division multiplexer
(32) by the multi-wavelength chaotic laser light of carrying information according to the wave of each subpattern of the more longitudinal mode semiconductor lasers (5) of no isolator
Long to separate, obtained multichannel chaotic laser light converts optical signals to electric signal by third photodetector (33)；
3. third road chaotic laser light enters through the 5th optoisolator (38) and the 4th optical fiber (37) for the demodulation for realizing reversed information
The 8th wavelength division multiplexer (36) of receiving end and the 4th photodetector (35) are converted to electric signal；Utilize the second info decoder
(34) above-mentioned two electric signal is carried out subtracting each other processing, so that it may which the information for extracting the different rates of transmitting terminal load is realized anti-
Safe and secret transmission to multichannel rate difference information.
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