CN110120838A - Two-way secure communication system with polarization rotation and phase and intensity chaos - Google Patents
Two-way secure communication system with polarization rotation and phase and intensity chaos Download PDFInfo
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- CN110120838A CN110120838A CN201910379423.1A CN201910379423A CN110120838A CN 110120838 A CN110120838 A CN 110120838A CN 201910379423 A CN201910379423 A CN 201910379423A CN 110120838 A CN110120838 A CN 110120838A
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07957—Monitoring or measuring wavelength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
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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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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Computer Security & Cryptography (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to the two-way secure communication system with polarization rotation and phase and intensity chaos, the first end and second end including two-way communication；First end includes sequentially connected reflecting mirror, phase-modulator, polarization beam apparatus, half-wave plate, vertical surface laser, the first beam splitter, circulator, phase-modulator, the second beam splitter and circulator；Polarization beam apparatus also passes sequentially through photoelectric detector, amplifier is connected to phase-modulator；First beam splitter is also connect with another two photoelectric detector respectively；Second beam splitter also passes sequentially through interferometer, the 4th photoelectric detector, the second amplifier and is connected to another phase-modulator, to carry out phase-modulation；Second end is identical as the structure of first end, and first end is connect with second end by half-wave plate.The present invention enhances the intensity chaos of optical signal by electro-optical feedback, and using the polarization direction of half-wave plate rotating light signals, improves the complexity of signal transmission, increase the confidentiality of chaos two-way communication.
Description
Technical field
The invention belongs to optical information technology fields, and in particular to a kind of with polarization rotation and phase and intensity chaos
Two-way secure communication system.
Background technique
Chaos is a kind of class random process of determination, and such chaos is in secret communication, image encryption and signal detection etc.
Aspect suffers from wide prospect.In the safe communication system that one is transmitted using chaotic carrier, usually using partly leading
Body laser (semiconductor laser, SL), which intercouples, increases its freedom degree to generate chaotic signal, past several
There are many successfully apply bidirectional couple semiconductor laser in year.Relative to traditional edge emitter laser, vertically
Cavity surface emitting lasers (VCSEL) have many advantages, such as low threshold current, low cost, round output beam distribution and easily
In large-scale integrated etc..
Chaotic Synchronous is the key technology of chaotic communication, and the parameter of Yao Shixian Chaotic Synchronous, transmitter and receiver is necessary
Unanimously, and time delay be also receive and transmitting terminal key parameter, how to hide, listener-in not allowed to steal, be realize chaos
The key of secret communication.
Summary of the invention
Based on the deficiencies in the prior art, the present invention, which provides one kind, has polarization rotation and phase and intensity chaos
Two-way secure communication system.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
Two-way secure communication system with polarization rotation and phase and intensity chaos, the first end including two-way communication
And second end；
The first end includes sequentially connected first reflecting mirror, first phase modulator, the first polarization beam apparatus, first
Half-wave plate, the first vertical surface laser, the first beam splitter, first annular device, second phase modulator, the second beam splitter and
Second ring device；Wherein, the first polarization beam apparatus also passes sequentially through the first photoelectric detector, the first amplifier is connected to first phase
Modulator；First beam splitter is also connect with the second photoelectric detector, third photoelectric detector respectively；Second beam splitter also successively leads to
It crosses the first interferometer, the 4th photoelectric detector, the second amplifier and is connected to second phase modulator, to carry out phase-modulation；
The second end includes sequentially connected second reflecting mirror, third phase modulator, the second polarization beam apparatus, second
Half-wave plate, the second vertical surface laser, third beam splitter, third circulator, the 4th phase-modulator, the 4th beam splitter,
Four circulators；Wherein, the second polarization beam apparatus also passes sequentially through the 5th photoelectric detector, third amplifier is connected to third phase
Modulator；Third beam splitter is also connect with the 6th photoelectric detector, the 7th photoelectric detector respectively；4th beam splitter also successively leads to
It crosses the second interferometer, the 8th photoelectric detector, the 4th amplifier and is connected to the 4th phase-modulator, to carry out phase-modulation；
Second circulator of the first end and the fourth annular device of second end are connected by third half-wave plate.
Preferably, two paths of signals passes through the first vertical surface laser of modulation and the second vertical surface laser respectively
The bias current of device, to encrypt into the chaotic signal of corresponding laser.
Preferably, first polarization beam apparatus, the second polarization beam apparatus, the first beam splitter, the second beam splitter,
The splitting ratio of third beam splitter and the 4th beam splitter is 1:1.
Preferably, the threshold current of the first vertical surface laser and the second vertical surface laser is
32.3mA。
Preferably, the transparent carrier number of the first vertical surface laser and the second vertical surface laser
It is 1.25 × 108, carrier rate of decay is 0.65ns-1。
Preferably, the transmission delay between the first vertical surface laser and the second vertical surface laser
For 5ns.
Preferably, the delay of feedback of the first vertical surface laser and the second vertical surface laser is
2.5ns。
Preferably, the feedback factor of the first vertical surface laser and the second vertical surface laser is
40ns-1, the coefficient of coup is 40ns-1。
Preferably, the quantum efficiency of all photoelectric detectors is 0.08.
Preferably, the gain of all amplifiers is 20dB.
Compared with prior art, the present invention beneficial effect is:
The outer part of two vertical surface lasers of the invention enhances intensity chaos by electro-optical feedback, utilizes half
Wave plate rotating signal polarization direction hides feedback time delay.The biasing that two-way numerical sequence signal passes through two lasers of modulation
Electric current is encrypted into the chaotic signal of laser, is divided into two-way by beam splitter, all the way for detecting original signal, another way
Phase-modulation is carried out by interferometer, photoelectric detector, amplifier, enhances the phase chaos of signal, signal is transferred through half
Wave plate rotating signal polarization direction conceals propagation delay time, transmits by circulator, then detected by photoelectric detector.Decoded mistake
Cheng Liyong photoelectric detector detects the power synchronous error of both ends laser, then carries out operation with local signal, can decrypt hair
The signal of sending end transmission, realizes the two-way communication in link between two-laser.
Detailed description of the invention
Fig. 1 is the two-way secure communication system with polarization rotation and phase and intensity chaos of the embodiment of the present invention
Structural schematic diagram；
Fig. 2 is the first vertical surface laser and the second vertical surface laser signal auto-correlation coefficient figure；
(a) in Fig. 3 is the information that the first vertical surface laser is sent, and (b) is restored for the second vertical surface laser
Information out.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation.
As shown in Figure 1, the two-way secure communication with polarization rotation and phase and intensity chaos of the embodiment of the present invention
System, including the first reflecting mirror 1-1, the second reflecting mirror 1-2, first phase modulator 2-1, second phase modulator 2-2, third
Phase-modulator 2-3, the 4th phase-modulator 2-4, the first polarization beam apparatus 3-1, the second polarization beam apparatus 3-2, the first photoelectricity
Detector 4-1, the second photoelectric detector 4-2, third photoelectric detector 4-3, the 4th photoelectric detector 4-4, the 5th Photoelectric Detection
Device 4-5, the 6th photoelectric detector 4-6, the 7th photoelectric detector 4-7, the 8th photoelectric detector 4-8, the first amplifier 5-1,
Two amplifier 5-2, third amplifier 5-3, the 4th amplifier 5-4, the first half-wave plate 6-1, the second half-wave plate 6-2, third half-wave
Piece 6-3, the first vertical surface laser 7-1, the second vertical surface laser 7-2, the first beam splitter 8-1, the second beam splitter 8-
2, third beam splitter 8-3, the 4th beam splitter 8-4, first annular device 9-1, the second circulator 9-2, third circulator 9-3, the 4th
Circulator 9-4, the first interferometer 10-1, the second interferometer 10-2.Wherein, the first vertical surface laser and the second vertical surface
Laser is vertical cavity surface emitting laser.
One end h1 of first vertical surface laser 7-1 is connected to the port g2 of the first half-wave plate 6-1, the first half-wave plate 6-
1 port g1 is connect with the port c2 of the first polarization beam apparatus 3-1, the port c1 of the first polarization beam apparatus 3-1 and first phase
The port b2 of modulator 2-1 connects, and the port c3 of the first polarization beam apparatus 3-1 is connected to the end d1 of the first photoelectric detector 4-1
Mouthful, the another port e1 of the first photoelectric detector 4-1 is connect with the port f1 of the first amplifier 5-1, the f2 of the first amplifier 5-1
Port is connected to the port b3 of first phase modulator 2-1, the port b1 of first phase modulator 2-1 and the first reflecting mirror 1-1
The port a1 connection, formed feedback.Likewise, one end h3 of the second vertical surface laser 7-2 is connected to the second half-wave plate 6-2
The port g4, the port g3 of the second half-wave plate 6-2 connect with the port c5 of the second polarization beam apparatus 3-2, the second polarization beam apparatus
The port c4 of 3-2 is connect with the port b8 of third phase modulator 2-3, and the port c6 of the second polarization beam apparatus 3-2 is connected to
The port d3 of five photoelectric detector 4-5, the port f5 of the another port e3 and third amplifier 5-3 of the 5th photoelectric detector 4-5
Connection, the port f6 of third amplifier 5-3 are connected to the port b9 of third phase modulator 2-3, third phase modulator 2-3's
The port b7 is connect with the port a2 of the second reflecting mirror 1-2, forms feedback.
First via signal is loaded into chaos carrier frequency by modulating the bias current of the first vertical surface laser 7-1, and first
The port h2 of vertical surface laser 7-1 is connected to the port i1 of the first beam splitter 8-1, and chaos carrier frequency is divided into two-way, send all the way
Enter the second photoelectric detector 4-2, for detecting the optical power of the first vertical surface laser 7-1, another way signal passes through optical fiber
It is connected to the port k1 of first annular device 9-1, the port l1 of first annular device 9-1 and the port b4 of second phase modulator 2-2
Connection, the port b5 of second phase modulator 2-2 are connect with the port i1 of the second beam splitter 8-2, and optical signal is divided into two-way, all the way
Signal is connected to the port n1 of the first interferometer 10-1, the n2 of the first interferometer 10-1 by the port o1 of the second beam splitter 8-2
Port is connected to the port d2 of the 4th photoelectric detector 4-4, and the port e2 of the 4th photoelectric detector 4-4 is connected to the second amplifier
The port f3 of 5-2, the port f2 of the second amplifier 5-2 are connected to the port b6 of second phase modulator 2-2, are used for phase tune
System；Another way signal is connected to the port k2 of the second circulator 9-2, the second circulator 9-2 by the port j2 of the second beam splitter 8-2
The port l2 connect with the port g5 of third half-wave plate 6-3, the another port g6 of third half-wave plate 6-3 is connected to fourth annular device
The port l4 of 9-4, the port m4 of fourth annular device 9-4 are connected to the port m3 of third circulator 9-3, third circulator 9-3's
The port k3 is connect with the port j3 of third beam splitter 8-3, and signal is transmitted into the 7th photoelectric detector 4-7, for detecting by the
The signal that the transmission of one laser comes.Similar, the bias current that second road signal passes through the second vertical surface laser 7-2 of modulation
It is loaded into chaos carrier frequency, the port h4 of the second vertical surface laser 7-2 is connected to the port i3 of third beam splitter 8-3, chaos
Carrier frequency is divided into two-way, is sent into the 6th photoelectric detector 4-6 all the way, for detecting the optical power of the second vertical surface laser 7-2,
Another way signal is connected to the port k3 of third circulator 9-3, the port l3 of third circulator 9-3 and the 4th phase by optical fiber
The port b10 of modulator 2-4 connects, and the port b11 of the 4th phase-modulator 2-4 is connect with the port i4 of the 4th beam splitter 8-4,
Optical signal is divided into two-way, and signal is connected to the port n3 of the second interferometer 10-2 by the port o2 of the 4th beam splitter 8-2 all the way,
The port n4 of second interferometer 10-2 is connected to the port d4 of the 8th photoelectric detector 4-8, the end e4 of the 8th photoelectric detector 4-8
Mouth is connected to the port f7 of the 4th amplifier 5-4, and the port f8 of the 4th amplifier 5-4 is connected to the 4th phase-modulator 2-4's
The port b12 is used for phase-modulation；Another way signal is connected to the k4 of fourth annular device 9-4 by the port j4 of the 4th beam splitter 8-4
The port l4 of port, fourth annular device 9-4 is connect with the port g6 of third half-wave plate 6-3, the another port of third half-wave plate 6-3
G5 is connected to the port l2 of the second circulator 9-2, and the port m2 of the second circulator 9-2 is connected to the end m1 of first annular device 9-1
Mouthful, the port k1 of first annular device 9-1 connect with the port j1 of the first beam splitter 8-1, signal is transmitted into third Photoelectric Detection
Device 4-3, for detect by second laser transmission Lai signal.
As shown in Fig. 2, the time in autocorrelogram between two peak values is when postponing if delay time does not hide
Between.It can not find two peaks in figure, illustrate that delay time is hidden.As shown in figure 3, information and reception that transmitting terminal is sent terminate
The information received is consistent.
In the embodiment of the present invention, the delay of feedback of two lasers is 2.5ns, the transmission delay between two lasers
For 5ns, current threshold 32.3mA, photon attenuation rate 496ns-1, carrier rate of decay 0.65ns-1, the differential gain 1.2 ×
102ns-1, linewidth enhancement factor 3, transparent carrier number 1.25 × 108, feedback factor 40ns-1, coefficient of coup 40ns-1.；It is all
The quantum efficiency of photoelectric detector is 0.08；The gain of all amplifiers is 20dB；First polarization beam apparatus, the second polarization
Beam splitter, the first beam splitter, the second beam splitter, third beam splitter and the 4th beam splitter splitting ratio be 1:1.
Two-way different digital sequence is passed through the bias current of two lasers of modulation, enciphering hiding to laser by the present invention
Chaotic signal in, pass through half-wave plate increase signal transmission complexity.The signal of two semiconductor lasers is coupled,
Cause Chaotic dynamics in two lasers, can prove that this chaos is synchronous, and there is robustness, when two
When holding simultaneous transmission " 0 " or " 1 ", two lasers are fully synchronized, when a biography " 1 ", when another passes " 0 ", two laser
Device is in desynchronizing state, and such system will switch between synchronization and desynchronizing state.Pass through two lasers of detection in this way
Luminous power difference, carry out operation with local signal, decode the signal of the other end, realize double between two-laser in link
To communication.The present invention the difference is that by electro-optical feedback enhancing signal intensity chaos and phase chaos, utilize half-wave plate
Rotating signal polarization direction hides time delay, enhances the complexity of signal transmission, improves the confidentiality of system.
The present invention is based on a kind of work of two-way secure communication system with polarization rotation and phase and intensity chaos
Process:
1, it is modulated using optical signal of the electro-optical feedback to laser, hiding feedback delay is rotated by half-wave plate, is led to
It crosses reflecting mirror and forms feedback.
2, by the bias current of modulates information laser, enciphering hiding is in the chaotic signal of laser.
3, in signals transmission, the signal of two semiconductor lasers is subjected to phase-modulation by electro-optical feedback, then
It is coupled by half-wave plate, causes Chaotic synchronous dynamics in two lasers.
4, by detecting the optical power of two lasers, the synchronous error between laser power is obtained.
5, and local signal compares and operation, decodes the information of other end transmission.
The present invention constructs the two-way secure communication system with polarization rotation and phase and intensity chaos, utilizes light device
Part realizes two-way chaotic communication, has the characteristics that at low cost, performance is stable, complexity is high, strong security.
The preferred embodiment of the present invention and principle are described in detail above, to those skilled in the art
Speech, the thought provided according to the present invention will change in specific embodiment, and these changes also should be regarded as the present invention
Protection scope.
Claims (10)
1. the two-way secure communication system with polarization rotation and phase and intensity chaos, which is characterized in that including two-way
The first end and second end of letter；
The first end includes sequentially connected first reflecting mirror, first phase modulator, the first polarization beam apparatus, the first half-wave
Piece, the first vertical surface laser, the first beam splitter, first annular device, second phase modulator, the second beam splitter and the second ring
Shape device；Wherein, the first polarization beam apparatus also passes sequentially through the first photoelectric detector, the first amplifier is connected to first phase modulation
Device；First beam splitter is also connect with the second photoelectric detector, third photoelectric detector respectively；Second beam splitter also passes sequentially through
One interferometer, the 4th photoelectric detector, the second amplifier are connected to second phase modulator, to carry out phase-modulation；
The second end includes sequentially connected second reflecting mirror, third phase modulator, the second polarization beam apparatus, the second half-wave
Piece, the second vertical surface laser, third beam splitter, third circulator, the 4th phase-modulator, the 4th beam splitter, Fourth Ring
Shape device；Wherein, the second polarization beam apparatus also passes sequentially through the 5th photoelectric detector, third amplifier is connected to third phase modulation
Device；Third beam splitter is also connect with the 6th photoelectric detector, the 7th photoelectric detector respectively；4th beam splitter also passes sequentially through
Two interferometers, the 8th photoelectric detector, the 4th amplifier are connected to the 4th phase-modulator, to carry out phase-modulation；
Second circulator of the first end and the fourth annular device of second end are connected by third half-wave plate.
2. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, two paths of signals passes through the biased electrical of modulation the first vertical surface laser and the second vertical surface laser respectively
Stream, to encrypt into the chaotic signal of corresponding laser.
3. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
Be characterized in that, first polarization beam apparatus, the second polarization beam apparatus, the first beam splitter, the second beam splitter, third beam splitter and
The splitting ratio of 4th beam splitter is 1:1.
4. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, the threshold current of the first vertical surface laser and the second vertical surface laser is 32.3mA.
5. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It being characterized in that, the transparent carrier number of the first vertical surface laser and the second vertical surface laser is 1.25 ×
108, carrier rate of decay is 0.65ns-1。
6. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, the transmission delay between the first vertical surface laser and the second vertical surface laser is 5ns.
7. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, the delay of feedback of the first vertical surface laser and the second vertical surface laser is 2.5ns.
8. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, the feedback factor of the first vertical surface laser and the second vertical surface laser is 40ns-1, coupled systemes
Number is 40ns-1。
9. the two-way secure communication system with polarization rotation and phase and intensity chaos according to claim 1,
It is characterized in that, the quantum efficiency of all photoelectric detectors is 0.08.
10. -9 described in any item bidirectional safes with polarization rotation and phase and intensity chaos are logical according to claim 1
Letter system, which is characterized in that the gain of all amplifiers is 20dB.
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| CN111510209A (en) * | 2020-04-10 | 2020-08-07 | 中国信息通信研究院 | Optical fiber vibration monitoring method and device |
| CN111555817A (en) * | 2020-05-09 | 2020-08-18 | 国网江苏省电力有限公司无锡供电分公司 | Differential modulation safety optical communication method and device based on coherent optical system |
| CN112600662A (en) * | 2020-12-10 | 2021-04-02 | 杭州电子科技大学 | Chaos secret communication system based on phase conjugation feedback |
| CN112838921A (en) * | 2020-12-31 | 2021-05-25 | 杭州电子科技大学 | Chaos bidirectional safety communication system with multiple feedback and electro-optic phase oscillation |
| CN112865951A (en) * | 2021-01-25 | 2021-05-28 | 杭州电子科技大学 | Electro-optical phase mutual coupling bidirectional chaotic communication system |
| CN113612544A (en) * | 2021-07-13 | 2021-11-05 | 杭州电子科技大学 | Optical chaotic secret communication system with four-dimensional key space |
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