CN109743114A - A kind of two-way multichannel chaotic laser light communication system and communication means - Google Patents
A kind of two-way multichannel chaotic laser light communication system and communication means Download PDFInfo
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Abstract
The invention discloses a kind of two-way multichannel chaotic laser light communication system and communication means; 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；The wavelength of adjustment injection light can regulate and control the chaotic laser light spectral bandwidth of the more longitudinal mode semiconductor laser outputs of no isolator and its chaotic laser light spectral bandwidth of each subpattern, it is separated with wavelength division multiplexer by longitudinal-mode wavelength, the chaotic laser light carrier wave as multichannel communication multiple telecommunication；The wide spectrum of acquisition, multimode, the chaotic laser light without delay characteristics are divided into three tunnels by two couplers and form two closed loop configurations, are respectively used to realize positive and reversed multiline message load transmission demodulation.The present invention generates synchronous chaotic laser light without two sublasers, simplifies system structure, not only has the ability that can be realized two-way multiline message secure communication, but also can be realized the function of different rates information while load.
Description
Technical field
The present invention relates to the broadband chaotic laser light communications field, specially a kind of two-way multichannel chaotic laser light communication system and logical
Letter method 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]。
Therefore, simplied system structure generates wide spectrum, the chaotic laser light without delay characteristics, constructs chaotic laser light communication system
System realizes that two-way, multiplex communication is very necessary, because not only can satisfy the requirement of high-speed communication rate, moreover it is possible to really
It protects communication system and transmits the safety of information, can be applied to wavelength-division multiplex secret signalling, chaotic laser light guarantor will be effectively pushed
The practicalization of close communication.
Summary of the invention
The present invention is limited to synchronous chaos laser frequency spectrum band to solve information rate in current chaotic secret communication system
There are exocoel delay characteristics in the chaotic laser light that width influences and traditional external cavity feedback generates, it is mixed to provide a kind of two-way multichannel
Ignorant laser communication system and communication means are that a kind of chaotic laser light spectral bandwidth is controllable, without exocoel delay characteristics and can use
In the chaotic secret communication system that two-way multichannel different rates information loads simultaneously.
The present invention is achieved by the following technical solution: a kind of two-way multichannel chaotic laser light communication system, including super
The light injection that broadband chaotic laser light generates partially, without delay characteristics multi-wavelength chaotic laser light generates part, positive multiline message adds
Carry 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 erbium-doped fiber amplifier,
The output end of first erbium-doped fiber amplifier is connect with the first optical fiber polarization controller input terminal, the first optical fiber polarization controller
Output end is connect with the first input end of the one 1 × 2nd 50:50 coupler, the one 1 × 2nd 50:50 coupler output and
The first port of one optical circulator 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 erbium-doped fiber amplifier, the output end of the second erbium-doped fiber amplifier and the first optical fiber polarisation
The input terminal of controller connects, and the output end of the first optical fiber polarization controller is connect with the second optical circulator first port, and 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 coupling
The connection of the second input terminal of clutch, directional scatter output end are connected with the first optoisolator input terminal, the first optoisolator output end
It is connect with the input terminal of the 21 × 2nd 50:50 coupler；
Forward direction multiline message load transmission demodulation part includes the 31 × 2nd 50:50 coupler, the 21 × 2nd 50:50
First output end of coupler is connect with the 31 × 2nd 50:50 coupler input, and the of the 31 × 2nd 50:50 coupler
One 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 output and the second photoelectricity are visited
The connection of device input terminal is surveyed, the second output terminal of the 31 × 2nd 50:50 coupler is connect with the second optic fibre input end, the second optical fiber
Output end is connect with the 41 × 2nd 50:50 coupler input, the 41 × 2nd the first output end of 50:50 coupler and third
The connection of optoisolator input terminal, third optoisolator output end are connect with the 4th wavelength division multiplexer input terminal, the 4th wavelength-division multiplex
Device output end is connect with the second photodetector input terminal；
It include the 4th optoisolator, the described 41 × 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 second output terminal of the 21 × 2nd 50:50 coupler and the 5th optoisolator input terminal connect
It connects, the 5th optoisolator output end is connect with the 4th optic fibre input end, and the 4th fiber-optic output and the 8th wavelength division multiplexer input
End connection, the 8th wavelength division multiplexer output end are connect with the 4th photodetector input terminal.
The communication means of two-way multichannel chaotic laser light communication system, specifically: without the more longitudinal mode semiconductor lasers of isolator
Two-beam is received by the first optical circulator, wherein a branch of from single mode band isolator semiconductor laser with tunable wavelength
Injection light, another beam from directional scatter feedback light, to generate multi-wavelength, without delay characteristics, video stretching it is mixed
Ignorant laser；First, second erbium-doped fiber amplifier and the first, second optical fiber polarization controller are respectively used to injection light and feedback light
The regulation of intensity, the multi-wavelength of generation, chaotic laser light without delay characteristics, video stretching by the first optoisolator and second,
31 × 2nd 50:50 coupler is divided into three beams chaotic laser light, wherein the first beam chaotic laser light is used as the light of positive information transmission
Source；Second beam chaotic laser light is divided into the demodulation that two-way is used for positive information all the way by the second optical fiber and the 4th coupler, another
The light source that road is transmitted as reversed information；Third beam chaotic laser light is used as the demodulation of reversed information, specific as follows:
1. the first beam 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 beam chaotic laser light after the second optical fiber and the 4th photo-coupler wherein all the way chaotic laser light through third light
Isolator enters receiving end and obtains electric signal through the 4th wavelength division multiplexer and the second photodetector again；It is decoded using the first information
Device carries out above-mentioned two electric signal to subtract each other processing, so that it may which the information for extracting the different rates of transmitting terminal load is realized positive
The safe and secret transmission of multichannel rate difference information；Second beam chaotic laser light obtains another by the second optical fiber and the 4th coupler
Chaotic laser light is used for the light source of reversed information transmission all the way, and the 5th wavelength division multiplexer is entered after the 4th optoisolator by multi-wavelength
Chaotic laser light is separated according to the wavelength of the more each subpatterns of longitudinal mode semiconductor laser of no isolator, wavelength, the frequency spectrum got
The different chaotic laser light of bandwidth is same using the second info encoder according to the width of each wavelength chaotic laser light frequency spectrum as carrier wave
When be loaded into the information of each road chaotic laser light different rates, each wavelength chaotic laser light is merged using the 6th wavelength division multiplexer
At a branch of, the 7th wavelength division multiplexer of receiving end is reached after the transmission of third optical fiber；7th wavelength division multiplexer is by carrying information
Multi-wavelength chaotic laser light according to the more each subpatterns of longitudinal mode semiconductor laser of no isolator wavelength separate, obtained multichannel
Chaotic laser light converts optical signals to electric signal by third photodetector；
3. to realize that the demodulation third beam chaotic laser light of reversed information enters receiving end warp through the 5th optoisolator and the 4th optical fiber
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 frequency of the chaotic laser light of exocoel delay characteristics under the laser injection of tunable laser
Spectrum widening, 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 exist with the wavelength of a mould in no isolator Multi-Longitudinal Mode laser
When the frequency detuning of 15GHz-30GHz, the beat frequency of injection light and chaotic laser light can be caused, and then the chaos of the mode is excited to swash
Optical frequency spectrum widening is 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 this application 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. by the multiple wavelength of the beam and the chaotic laser light without exocoel delay characteristics is divided into three tunnels by two couplers and is formed
Two closed loops, one of closed loop can realize positive multiline message load transmission demodulation, another closed loop is for realizing reversed more
The load transmission demodulation of road information.To realize information demodulation, the present invention claims information transmission fibers and the light for entering information receiving end
Fine length is consistent, that is, positive information transmission fiber is consistent with the positive information receiving end fiber lengths that enter, i.e. the first optical fiber
It is equal with the second fiber lengths.What it is due to composition is two closed loop configurations, that is, is used for transmission demodulation positive chaotic laser light and hair
The chaotic laser light for giving reversed receiving end shares an optical fiber (the second optical fiber), and furthermore information will also pass through length when reverse link communication
The third optical fiber transmission equal with the first, second optical fiber reaches communication party, and this requires the chaotic laser lights demodulated for information to exist
The 4th optical fiber by one section of 2 times of information transmission fibers (third optical fiber) length is needed before into reversed receiving end, with realization pair
The demodulation of reverse transfer information.
Compared with prior art the invention has the following advantages: the present invention to provide a kind of two-way multichannel chaotic laser light logical
Letter system and communication means not only realize multiline message simultaneous transmission compared with prior art, and can produce spectral bandwidth and be greater than
The chaotic laser light of 25GHz is also equipped with two-way communications capabilities, advantage and good effect embody a concentrated reflection of for loading high speed information
:
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, the present invention eliminates the reliance on two chaos lasers using multi-wavelength chaotic laser light as the carrier wave of transmission information
Synchronism output, building two closed loop configurations realizes two-way multiline message secrecy transmission, and this method effectively advances mixed
The practical process of ignorant laser secret communication.
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, the first Er-doped fiber of 2- in figure
Amplifier, the first optical fiber polarization controller of 3-, the 50:50 coupler of 4- the one 1 × 2nd, 5- swash without the more longitudinal mode semiconductors of isolator
Light device, the first optical circulator of 6-, the second erbium-doped fiber amplifier of 7-, the second optical fiber polarization controller of 8-, the second optical circulator of 9-,
10- directional scatter, the first optoisolator of 11-, the 50:50 coupler of 12- the 21 × 2nd, the 50:50 coupling of 13- the 31 × 2nd
Device, the second optoisolator of 14-, the first wavelength division multiplexer of 15-, 16- first information encoder, the second wavelength division multiplexer of 17-, 18-
First optical fiber, 19- third wavelength division multiplexer, the first photodetector of 20-, 21- first information decoder, the second photoelectricity of 22- are visited
Survey device, the 4th wavelength division multiplexer of 23-, 24- third optoisolator, the 50:50 coupler of 25- the 41 × 2nd, the second optical fiber of 26-,
The 4th optoisolator of 27-, the 5th wavelength division multiplexer of 28-, 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 multichannel chaotic laser light communication system, as shown in Figure 1, including the light injection that ultra wide band chaotic laser generates
Partially, part, positive multiline message load transmission demodulation part, reversed multichannel letter are generated without delay characteristics multi-wavelength chaotic laser light
Breath 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 terminal of the single mode with 1 output end of isolator semiconductor laser with tunable wavelength and the first erbium-doped fiber amplifier 2
Connection, the output end of the first erbium-doped fiber amplifier 2 are connect with 3 input terminal of the first optical fiber polarization controller, the first optical fiber polarisation
The output end of 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 ends are 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, 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 erbium-doped fiber amplifier 7, the output end and first of the second erbium-doped fiber amplifier 7
The input terminal of optical fiber polarization controller 8 connects, 9 first end of output end and the second optical circulator of the first optical fiber polarization controller 8
Mouthful connection, 9 second port of the second optical circulator is connected with 10 input terminal of directional scatter, 9 third port of the second optical circulator and the
One 1 × 24 second input terminal of 50:50 coupler connection, 10 output end of directional scatter and 11 input terminal phase of the first optoisolator
Even, 11 output end of the first optoisolator is connect with the input terminal of the 21 × 2nd 50:50 coupler 12；
The forward direction multiline message, which loads, transmits the 50:50 coupler 13 that demodulation part includes the 31 × 2nd, and the 50 of the 21 × 2nd:
First output end of 50 couplers 12 is connect with the 31 × 2nd 13 input terminal of 50:50 coupler, the 31 × 2nd 50:50 coupling
First output end of device 13 is connect with 14 input terminal of the second optoisolator, 14 output end of the second optoisolator and the first wavelength-division multiplex
The connection of 15 input terminal of device, 15 output end of the first wavelength division multiplexer are connect with 16 input terminal of first information encoder, and the first information is compiled
Code 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 are defeated
Enter end connection, 18 output end of the first optical fiber is connect with 19 input terminal of third wavelength division multiplexer, 19 output end of third wavelength division multiplexer
It is connect with 20 input terminal of the first photodetector, 20 output end of the first photodetector and 21 input terminal of first information decoder connect
It connects, 21 output end of first information decoder is connect with 22 input terminal of the second photodetector, the 31 × 2nd 50:50 coupler 13
Second output terminal connect with 26 input terminal of the second optical fiber, 26 output end of the second optical fiber and the 41 × 2nd 50:50 coupler 25
Input terminal connection, the 41 × 2nd 25 first output end of 50:50 coupler are connect with 24 input terminal of third optoisolator, third light
24 output end of isolator 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 photoelectricity are visited
Survey the connection of 22 input terminal of device；
It include the 4th optoisolator 27, the 41 × 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 21 × 2nd 50:50 coupler
12 second output terminal is connect with 38 input terminal of the 5th optoisolator, and 38 output end of the 5th optoisolator and the 4th optical fiber 37 input
End connection, 37 output end of the 4th optical fiber connect with 36 input terminal of the 8th wavelength division multiplexer, 36 output end of the 8th wavelength division multiplexer and
The connection of 4th photodetector, 35 input terminal.
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 communication means of the two-way multichannel chaotic laser light communication system of the present embodiment, specifically: without the more longitudinal modes of isolator half
Conductor laser 5 receives two-beam by the first optical circulator 6, wherein a branch of from single mode band isolator tunable wave length
The injection light of semiconductor laser 1, another beam from directional scatter 10 feedback light, to generate multi-wavelength, without time delay spy
The chaotic laser light of sign, video stretching；First, second erbium-doped fiber amplifier 2,7 and the first, second optical fiber polarization controller 3,8
It is respectively used to injection light and feeds back the regulation of luminous intensity, the multi-wavelength of generation, the chaotic laser light warp without delay characteristics, video stretching
The first optoisolator 11 and second, third 1 × 2 50:50 coupler 12,13 are crossed, is divided into three beams chaotic laser light, wherein the first beam
Chaotic laser light is used as the light source of positive information transmission；Second beam chaotic laser light passes through the 50:50 of the second optical fiber the 26 and the 41 × 2nd
Coupler 25 divides for two-way, all the way demodulation for positive information, the light source that another way is transmitted as reversed information；Third beam is mixed
Ignorant laser is used as the demodulation of reversed information；
1. the first beam 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 beam chaotic laser light wherein chaos all the way after the 50:50 coupler 25 of the second optical fiber the 26 and the 41 × 2nd
Laser enters receiving end through third optoisolator 24 and obtains telecommunications through the 4th wavelength division multiplexer 23 and the second photodetector 22 again
Number；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 load not
The information of same rate realizes the safe and secret transmission of positive multichannel rate difference information；Second beam chaotic laser light passes through the second light
The another way chaotic laser light that the 50:50 coupler 25 of fibre the 26 and the 41 × 2nd obtains is used for the light source of reversed information transmission, through the
Enter the 5th wavelength division multiplexer 28 after four optoisolators 27 to swash multi-wavelength chaotic laser light according to the more longitudinal mode semiconductors of no isolator
The wavelength of each subpattern of light device 5 separates, and the different chaotic laser light of the wavelength that gets, spectral bandwidth is as carrier wave, according to each
The width of a wavelength chaotic laser light frequency spectrum is loaded into each road chaotic laser light different rates using the second info encoder 29 simultaneously
Information, each wavelength chaotic laser light is merged into using the 6th wavelength division multiplexer 30 it is a branch of, after the transmission of third optical fiber 31
Reach the 7th wavelength division multiplexer 32 of receiving end；7th wavelength division multiplexer 32 is by the multi-wavelength chaotic laser light of carrying information according to nothing
The wavelength of each subpattern of the more longitudinal mode semiconductor lasers 5 of isolator separates, and obtained multichannel chaotic laser light passes through third photoelectricity
Detector 33 converts optical signals to electric signal.
3. third beam 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；It will using the second info decoder 34
Above-mentioned two electric signal 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
The safe and secret transmission of rate difference 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 (5)
1. a kind of two-way multichannel chaotic laser light communication system, it is characterised in that: the light injection generated including ultra wide band chaotic laser
Partially, part, positive multiline message load transmission demodulation part, reversed multichannel letter are generated without delay characteristics multi-wavelength chaotic laser light
Breath 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 with isolator semiconductor laser with tunable wavelength (1) output end and the first erbium-doped fiber amplifier (2)
Input terminal connection, the output end of the first erbium-doped fiber amplifier (2) are connect with the first optical fiber polarization controller (3) input terminal, the
The output end of one optical fiber polarization controller (3) is connect with the first input end of the one 1 × 2nd 50:50 coupler (4), the one 1 ×
2 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 erbium-doped fiber amplifier (7), the second erbium-doped fiber amplifier (7)
Output end is connect with the input terminal of the first optical fiber polarization controller (8), the output end and second of the first optical fiber polarization controller (8)
The connection of optical circulator (9) first port, the second optical circulator (9) second port are connected with directional scatter (10) input terminal, and 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 be connected with the first optoisolator (11) input terminal, the first optoisolator (11) output end and the 21 × 2nd 50:50 coupler
(12) input terminal connection；
The forward direction multiline message, which loads, transmits the 50:50 coupler (13) that demodulation part includes the 31 × 2nd, the 21 × 2nd
First output end of 50:50 coupler (12) is connect with the 31 × 2nd 50:50 coupler (13) input terminal, the 31 × 2nd
First output end of 50:50 coupler (13) is connect with the second optoisolator (14) input terminal, the second optoisolator (14) output
End is connect with the first wavelength division multiplexer (15) input terminal, the first wavelength division multiplexer (15) output end and first information encoder (16)
Input terminal connection, first information encoder (16) output end are connect with the second wavelength division multiplexer (17) input terminal, and the second wavelength-division is multiple
It is connect with device (17) output end with the first optical fiber (18) input terminal, the first optical fiber (18) output end and third wavelength division multiplexer (19)
Input terminal connection, third wavelength division multiplexer (19) output end are connect with the first photodetector (20) input terminal, and the first photoelectricity is visited
It surveys device (20) output end to connect with first information decoder (21) input terminal, first information decoder (21) input terminal and the second light
The connection of electric explorer (22) output end；The second output terminal and the second optical fiber (26) of 31 × 2nd 50:50 coupler (13) are defeated
Entering end connection, the second optical fiber (26) output end is connect with the 41 × 2nd 50:50 coupler (25) input terminal, the 41 × 2nd
(25) first output end of 50:50 coupler is connect with third optoisolator (24) input terminal, third optoisolator (24) output end
It is connect with the 4th wavelength division multiplexer (23) input terminal, the 4th wavelength division multiplexer (23) output end and the second photodetector (22) are defeated
Enter end connection；
Including the 4th optoisolator (27) in the reversed multiline message load transmission demodulation part, the 50 of the described 41 × 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
The connection of device (35) output end is surveyed, the second output terminal of the 21 × 2nd 50:50 coupler (12) and the 5th optoisolator (38) are defeated
Enter end connection, the 5th optoisolator (38) output end connect with the 4th optical fiber (37) input terminal, the 4th optical fiber (37) output end and
The connection of 8th wavelength division multiplexer (36) input terminal, the 8th wavelength division multiplexer (36) output end and the 4th photodetector (35) input
End connection.
2. two-way multichannel chaotic laser light communication system according to claim 1, it is characterised in that: adjust single mode band isolator
The output wavelength of semiconductor laser with tunable wavelength (1) and a mould in the more longitudinal mode semiconductor lasers (5) of no isolator
There are the frequency detunings of 15GHz-30GHz for the wavelength of formula.
3. two-way multichannel chaotic laser light communication system according to claim 1, it is characterised in that: each info encoder adds
The rate of information carrying breath is less than the spectral bandwidth for carrying its chaotic laser light used.
4. two-way multichannel chaotic laser light communication system according to claim 1, it is characterised in that: the first, second, third light
The equal length of fine (18,26,31) and be the 4th optical fiber (37) length half.
5. the communication means of two-way multichannel chaotic laser light communication system described in claim 1, it is characterised in that: more without isolator
Longitudinal mode semiconductor laser (5) receives 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, it is more to generate
Wavelength, the chaotic laser light without delay characteristics, video stretching；First, second erbium-doped fiber amplifier (2,7) and the first, second light
Fine Polarization Controller (3,8) is respectively used to injection light and feeds back the regulation of luminous intensity, the multi-wavelength of generation, without delay characteristics, frequency
The chaotic laser light of spectrum widening passes through the first optoisolator (11) and second, third 1 × 2 50:50 coupler (12,13), is divided into
Three beams chaotic laser light, wherein the first beam chaotic laser light is used as the light source of positive information transmission；Second beam chaotic laser light passes through second
Optical fiber (26) and the 41 × 2nd 50:50 coupler (25) are divided into two-way, all the way the demodulation for positive information, another way conduct
The light source of reversed information transmission；Third beam chaotic laser light is used as the demodulation of reversed information；
1. the first beam 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 beam chaotic laser light by the second optical fiber (26) and the 41 × 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 beam
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 41 × 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 beam 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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