CN110120838B - Bidirectional secure communication system with polarization rotation and phase and intensity chaos - Google Patents
Bidirectional secure communication system with polarization rotation and phase and intensity chaos Download PDFInfo
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- CN110120838B CN110120838B CN201910379423.1A CN201910379423A CN110120838B CN 110120838 B CN110120838 B CN 110120838B CN 201910379423 A CN201910379423 A CN 201910379423A CN 110120838 B CN110120838 B CN 110120838B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- 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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Abstract
The invention relates to a bidirectional safety communication system with polarization rotation and chaos of phase and intensity, which comprises a first end and a second end for bidirectional communication; the first end comprises a reflector, a phase modulator, a polarization beam splitter, a half-wave plate, a vertical surface laser, a first beam splitter, a circulator, a phase modulator, a second beam splitter and a circulator which are connected in sequence; the polarization beam splitter is also connected to the phase modulator through the photoelectric detector and the amplifier in sequence; the first beam splitter is also respectively connected with the other two photoelectric detectors; the second beam splitter is also connected to another phase modulator sequentially through the interferometer, the fourth photodetector and the second amplifier so as to perform phase modulation; the second end has the same structure as the first end, and the first end and the second end are connected through a half-wave plate. The invention enhances the intensity chaos of the optical signal through the photoelectric feedback, and utilizes the half-wave plate to rotate the polarization direction of the optical signal, thereby improving the complexity of signal transmission and enhancing the confidentiality of chaotic bidirectional communication.
Description
Technical Field
The invention belongs to the technical field of optical information, and particularly relates to a bidirectional safety communication system with polarization rotation and chaotic phase and intensity.
Background
The chaos is a definite random-like process, so that the chaos has a wide prospect in the aspects of secret communication, image encryption, signal detection and the like. In a secure communication system using chaotic carrier for transmission, Semiconductor Lasers (SL) are often used to couple with each other to increase the degree of freedom thereof to generate chaotic signals, and bidirectional coupled semiconductor lasers have been used with many success in the past few years. Vertical Cavity Surface Emitting Lasers (VCSELs) have many advantages over conventional edge emitting lasers, such as low threshold current, low cost, circular output beam profile, and ease of large scale integration.
Chaotic synchronization is a key technology of chaotic communication, in order to realize chaotic synchronization, parameters of a transmitter and a receiver must be consistent, time delay is also a key parameter of a receiving end and a transmitting end, and how to hide the parameters from eavesdroppers is a key for realizing chaotic secret communication.
Disclosure of Invention
Based on the defects in the prior art, the invention provides a bidirectional safety communication system with polarization rotation and chaotic phase and intensity.
In order to achieve the purpose, the invention adopts the following technical scheme:
the bidirectional safety communication system with polarization rotation and chaos of phase and intensity comprises a first end and a second end for bidirectional communication;
the first end comprises a first reflector, a first phase modulator, a first polarization beam splitter, a first half-wave plate, a first vertical surface laser, a first beam splitter, a first circulator, a second phase modulator, a second beam splitter and a second circulator which are sequentially connected; the first polarization beam splitter is also connected to the first phase modulator sequentially through the first photoelectric detector and the first amplifier; the first beam splitter is also connected with the second photoelectric detector and the third photoelectric detector respectively; the second beam splitter is also connected to the second phase modulator sequentially through the first interferometer, the fourth photodetector and the second amplifier so as to perform phase modulation;
the second end comprises a second reflecting mirror, a third phase modulator, a second polarization beam splitter, a second half-wave plate, a second vertical surface laser, a third beam splitter, a third circulator, a fourth phase modulator, a fourth beam splitter and a fourth circulator which are sequentially connected; the second polarization beam splitter is also connected to the third phase modulator sequentially through a fifth photoelectric detector and a third amplifier; the third beam splitter is also connected with a sixth photoelectric detector and a seventh photoelectric detector respectively; the fourth beam splitter is also connected to the fourth phase modulator sequentially through the second interferometer, the eighth photodetector and the fourth amplifier so as to perform phase modulation;
the second circulator at the first end is connected with the fourth circulator at the second end through a third half-wave plate.
As a preferred scheme, the two paths of signals are encrypted to chaotic signals of corresponding lasers by modulating bias currents of the first vertical surface laser and the second vertical surface laser respectively.
Preferably, the splitting ratios of the first polarization beam splitter, the second polarization beam splitter, the first beam splitter, the second beam splitter, the third beam splitter and the fourth beam splitter are all 1: 1.
preferably, the threshold current of the first vertical surface laser and the threshold current of the second vertical surface laser are both 32.3 mA.
Preferably, the number of transparent carriers of the first vertical surface laser and the second vertical surface laser are both 1.25 × 108The carrier decay rates are all 0.65ns-1。
Preferably, the transmission delay between the first vertical surface laser and the second vertical surface laser is 5 ns.
Preferably, the feedback delay of the first vertical surface laser and the feedback delay of the second vertical surface laser are both 2.5 ns.
Preferably, the feedback coefficients of the first vertical surface laser and the second vertical surface laser are both 40ns-1The coupling coefficients are all 40ns-1。
Preferably, the quantum efficiency of all photodetectors is 0.08.
Preferably, the gain of all amplifiers is 20 dB.
Compared with the prior art, the invention has the beneficial effects that:
the outer cavity parts of the two vertical surface lasers enhance the intensity chaos through photoelectric feedback, and the polarization direction of a rotating signal of the half-wave plate is used for hiding the feedback time delay. Two paths of digital sequence signals are encrypted into chaotic signals of the lasers by modulating bias currents of the two lasers, the chaotic signals are divided into two paths through the beam splitter, one path is used for detecting original signals, the other path is subjected to phase modulation through the interferometer, the photoelectric detector and the amplifier, the phase chaos of the signals is enhanced, the transmission time delay is hidden in the signal transmission process through the rotation of the half-wave plate in the polarization direction, the signal transmission process is carried out through the circulator, and then the signal detection process is carried out through the photoelectric detector. In the decoding process, the photoelectric detector is used for detecting the power synchronization errors of the lasers at the two ends, and then the power synchronization errors and the local signals are calculated, so that the signals transmitted by the transmitting end can be decrypted, and the two-way communication between the two lasers in the link is realized.
Drawings
FIG. 1 is a schematic structural diagram of a two-way secure communication system with polarization rotation and phase and intensity chaos according to an embodiment of the present invention;
FIG. 2 is a graph of the signal autocorrelation coefficients of a first vertical surface laser and a second vertical surface laser;
in fig. 3, (a) is the information transmitted by the first vertical surface laser, and (b) is the information recovered by the second vertical surface laser.
Detailed Description
The technical solution of the present invention is further described below by means of specific examples.
As shown in FIG. 1, the two-way secure communication system with polarization rotation and chaos of phase and intensity according to the embodiment of the present invention includes a first mirror 1-1, a second mirror 1-2, a first phase modulator 2-1, a second phase modulator 2-2, a third phase modulator 2-3, a fourth phase modulator 2-4, a first polarization beam splitter 3-1, a second polarization beam splitter 3-2, a first photo detector 4-1, a second photo detector 4-2, a third photo detector 4-3, a fourth photo detector 4-4, a fifth photo detector 4-5, a sixth photo detector 4-6, a seventh photo detector 4-7, an eighth photo detector 4-8, a first amplifier 5-1, a second amplifier 5-2, The interferometer comprises a third amplifier 5-3, a fourth amplifier 5-4, a first half wave plate 6-1, a second half wave plate 6-2, a third half wave plate 6-3, a first vertical surface laser 7-1, a second vertical surface laser 7-2, a first beam splitter 8-1, a second beam splitter 8-2, a third beam splitter 8-3, a fourth beam splitter 8-4, a first circulator 9-1, a second circulator 9-2, a third circulator 9-3, a fourth circulator 9-4, a first interferometer 10-1 and a second interferometer 10-2. The first vertical surface laser and the second vertical surface laser are vertical cavity surface emitting lasers.
One end h1 of the first vertical surface laser 7-1 is connected to a g2 port of the first half wave plate 6-1, a g1 port of the first half wave plate 6-1 is connected to a c2 port of the first polarization beam splitter 3-1, a c1 port of the first polarization beam splitter 3-1 is connected to a b2 port of the first phase modulator 2-1, a c3 port of the first polarization beam splitter 3-1 is connected to a d1 port of the first photodetector 4-1, another port e1 of the first photodetector 4-1 is connected to an f1 port of the first amplifier 5-1, an f2 port of the first amplifier 5-1 is connected to a b3 port of the first phase modulator 2-1, and a b1 port of the first phase modulator 2-1 is connected to a1 port of the first mirror 1-1 to form a feedback. Similarly, one end h3 of the second vertical surface laser 7-2 is connected to the g4 port of the second half wave plate 6-2, the g3 port of the second half wave plate 6-2 is connected to the c5 port of the second polarization beam splitter 3-2, the c4 port of the second polarization beam splitter 3-2 is connected to the b8 port of the third phase modulator 2-3, the c6 port of the second polarization beam splitter 3-2 is connected to the d3 port of the fifth photodetector 4-5, the other port e3 of the fifth photodetector 4-5 is connected to the f5 port of the third amplifier 5-3, the f6 port of the third amplifier 5-3 is connected to the b9 port of the third phase modulator 2-3, and the b7 port of the third phase modulator 2-3 is connected to the a2 port of the second mirror 1-2 to form feedback.
A first path of signal is loaded to a chaotic carrier frequency by modulating bias current of a first vertical surface laser 7-1, an h2 port of the first vertical surface laser 7-1 is connected to an i1 port of a first beam splitter 8-1, the chaotic carrier frequency is divided into two paths, one path of signal is sent to a second photoelectric detector 4-2 for detecting the optical power of the first vertical surface laser 7-1, the other path of signal is connected to a k1 port of a first circulator 9-1 through an optical fiber, an l1 port of the first circulator 9-1 is connected with a b4 port of a second phase modulator 2-2, a b5 port of the second phase modulator 2-2 is connected with an i1 port of the second beam splitter 8-2, the optical signal is divided into two paths, one path of signal is connected to an n1 port of the first interferometer 10-1 through an o1 port of the second beam splitter 8-2, the n2 port of the first interferometer 10-1 is connected to the d2 port of the fourth photodetector 4-4, the e2 port of the fourth photodetector 4-4 is connected to the f3 port of the second amplifier 5-2, the f2 port of the second amplifier 5-2 is connected to the b6 port of the second phase modulator 2-2 for phase modulation; the other signal is connected to the k2 port of the second circulator 9-2 by the j2 port of the second beam splitter 8-2, the l2 port of the second circulator 9-2 is connected to the g5 port of the third half wave plate 6-3, the other port g6 of the third half wave plate 6-3 is connected to the l4 port of the fourth circulator 9-4, the m4 port of the fourth circulator 9-4 is connected to the m3 port of the third circulator 9-3, and the k3 port of the third circulator 9-3 is connected to the j3 port of the third beam splitter 8-3, and the signal is transmitted to the seventh photodetector 4-7 for detecting the signal transmitted by the first laser. Similarly, the second signal is loaded to the chaotic carrier frequency by modulating the bias current of the second vertical surface laser 7-2, the h4 port of the second vertical surface laser 7-2 is connected to the i3 port of the third beam splitter 8-3, the chaotic carrier frequency is divided into two paths, one path is sent to the sixth photoelectric detector 4-6 for detecting the optical power of the second vertical surface laser 7-2, the other path is connected to the k3 port of the third circulator 9-3 through an optical fiber, the l3 port of the third circulator 9-3 is connected to the b10 port of the fourth phase modulator 2-4, the b11 port of the fourth phase modulator 2-4 is connected to the i4 port of the fourth beam splitter 8-4, the optical signal is divided into two paths, one path is connected to the n3 port of the second interferometer 10-2 through the o2 port of the fourth beam splitter 8-2, the n4 port of the second interferometer 10-2 is connected to the d4 port of the eighth photodetector 4-8, the e4 port of the eighth photodetector 4-8 is connected to the f7 port of the fourth amplifier 5-4, the f8 port of the fourth amplifier 5-4 is connected to the b12 port of the fourth phase modulator 2-4 for phase modulation; the other signal is connected to the k4 port of the fourth circulator 9-4 through the j4 port of the fourth splitter 8-4, the l4 port of the fourth circulator 9-4 is connected to the g6 port of the third half-wave plate 6-3, the other port g5 of the third half-wave plate 6-3 is connected to the l2 port of the second circulator 9-2, the m2 port of the second circulator 9-2 is connected to the m1 port of the first circulator 9-1, the k1 port of the first circulator 9-1 is connected to the j1 port of the first splitter 8-1, and the signal is transmitted to the third photodetector 4-3 for detecting the signal transmitted by the second laser.
As shown in fig. 2, if the delay time is not hidden, the time between two peaks in the autocorrelation graph is the delay time. Two peaks are not found in the figure, indicating that the delay time is hidden. As shown in fig. 3, the information transmitted by the transmitting end is consistent with the information received by the receiving end.
In the embodiment of the invention, the feedback delay of the two lasers is 2.5ns, the transmission delay between the two lasers is 5ns, the current threshold is 32.3mA, and the photon attenuation rate is 496ns-1Carrier decay rate of 0.65ns-1Differential gain 1.2 × 102ns-1Line width enhancement factor 3, number of transparent carriers 1.25 × 108Feedback coefficient of 40ns-1Coupling coefficient of 40ns-1. (ii) a The quantum efficiency of all the photodetectors is 0.08; the gains of all amplifiers are 20 dB; the splitting ratios of the first polarization beam splitter, the second polarization beam splitter, the first beam splitter, the second beam splitter, the third beam splitter and the fourth beam splitter are all 1: 1.
according to the invention, two paths of different digital sequences are encrypted and hidden in chaotic signals of the lasers by modulating bias currents of the two lasers, and the complexity of signal transmission is increased by the half-wave plate. The signals of the two semiconductor lasers are coupled to cause time-delay chaotic dynamics in the two lasers, so that the chaos is synchronous and has robustness, when two ends transmit '0' or '1' at the same time, the two lasers are completely synchronous, when one transmits '1' and the other transmits '0', the two lasers are in an out-of-step state, and thus the system is switched between the synchronous state and the out-of-step state. Therefore, the optical power difference of the two lasers is detected, the optical power difference and the local signal are calculated, the signal at the other end is decoded, and the two-way communication between the two lasers in the link is realized. The invention is characterized in that the strength chaos and the phase chaos of the signals are enhanced through the electro-optical feedback, the polarization direction of the signals is hidden by the half-wave plate, the complexity of signal transmission is enhanced, and the confidentiality of the system is improved.
The invention is based on the working process of a bidirectional safety communication system with polarization rotation and chaos of phase and intensity:
1. the electro-optic feedback is utilized to modulate the optical signal of the laser, the feedback time delay is hidden through the rotation of the half-wave plate, and the feedback is formed through the reflector.
2. And modulating bias current of the laser by the information, and encrypting and hiding the bias current in a chaotic signal of the laser.
3. In the signal transmission process, signals of the two semiconductor lasers are subjected to phase modulation through photoelectric feedback, and delay chaos synchronous dynamics is caused in the two lasers through half-wave plate coupling.
4. And detecting the optical power of the two lasers to obtain the synchronization error between the laser powers.
5. And comparing the local signal with the local signal and calculating to decode the information transmitted by the other end.
The invention constructs a bidirectional safe communication system with polarization rotation and chaotic phase and intensity, realizes bidirectional chaotic communication by using an optical device, and has the characteristics of low cost, stable performance, high complexity, strong confidentiality and the like.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (9)
1. The bidirectional safety communication system with polarization rotation and chaos of phase and intensity is characterized by comprising a first end and a second end for bidirectional communication;
the first end comprises a first reflector, a first phase modulator, a first polarization beam splitter, a first half-wave plate, a first vertical surface laser, a first beam splitter, a first circulator, a second phase modulator, a second beam splitter and a second circulator which are sequentially connected; the first polarization beam splitter is also connected to the first phase modulator sequentially through the first photoelectric detector and the first amplifier; the first beam splitter is also connected with the second photoelectric detector and the third photoelectric detector respectively; the second beam splitter is also connected to the second phase modulator sequentially through the first interferometer, the fourth photodetector and the second amplifier so as to perform phase modulation;
the second end comprises a second reflecting mirror, a third phase modulator, a second polarization beam splitter, a second half-wave plate, a second vertical surface laser, a third beam splitter, a third circulator, a fourth phase modulator, a fourth beam splitter and a fourth circulator which are sequentially connected; the second polarization beam splitter is also connected to the third phase modulator sequentially through a fifth photoelectric detector and a third amplifier; the third beam splitter is also connected with a sixth photoelectric detector and a seventh photoelectric detector respectively; the fourth beam splitter is also connected to the fourth phase modulator sequentially through the second interferometer, the eighth photodetector and the fourth amplifier so as to perform phase modulation;
the second circulator at the first end is connected with the fourth circulator at the second end through a third half-wave plate;
the two paths of signals are encrypted to chaotic signals of corresponding lasers by modulating bias currents of the first vertical surface laser and the second vertical surface laser respectively.
2. The system of claim 1, wherein the first polarizing beam splitter, the second polarizing beam splitter, the first beam splitter, the second beam splitter, the third beam splitter, and the fourth beam splitter have a splitting ratio of 1: 1.
3. the two-way secure communications system with polarization rotation and phase and intensity chaos of claim 1, wherein the threshold currents of the first and second vertical surface lasers are both 32.3 mA.
4. The two-way secure communication system with polarization rotation and chaos of phase and intensity of claim 1, wherein the number of transparent carriers of the first and second vcls are each 1.25 × 108The carrier decay rates are all 0.65ns-1。
5. A two-way secure communications system with polarization rotation and chaos in phase and intensity according to claim 1, wherein the transmission delay between the first and second vertical surface lasers is 5 ns.
6. A two-way secure communications system with polarization rotation and phase and intensity chaos according to claim 1, wherein the feedback delays of the first and second vertical surface lasers are both 2.5 ns.
7. The two-way secure communication system with polarization rotation and chaos of phase and intensity of claim 1, wherein the feedback coefficients of the first and second vertical surface lasers are both 40ns-1The coupling coefficients are all 40ns-1。
8. A two-way secure communication system with polarization rotation and chaos in phase and intensity according to claim 1, wherein the quantum efficiency of all photodetectors is 0.08.
9. A two-way secure communication system with polarization rotation and chaos in phase and intensity according to any of claims 1-8, wherein the gain of all amplifiers is 20 dB.
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| CN111555817B (en) * | 2020-05-09 | 2021-04-02 | 国网江苏省电力有限公司无锡供电分公司 | Differential modulation safety optical communication method and device based on coherent optical system |
| CN112600662B (en) * | 2020-12-10 | 2022-06-10 | 杭州电子科技大学 | Chaos secret communication system based on phase conjugation feedback |
| CN112838921B (en) * | 2020-12-31 | 2022-06-10 | 杭州电子科技大学 | Chaos bidirectional safety communication system with multiple feedback and electro-optic phase oscillation |
| CN112865951B (en) * | 2021-01-25 | 2022-06-14 | 杭州电子科技大学 | Electro-optical phase mutual coupling bidirectional chaotic communication system |
| CN113612544B (en) * | 2021-07-13 | 2022-08-19 | 杭州电子科技大学 | Optical chaotic secret communication system with four-dimensional secret key space |
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| CN109088716B (en) * | 2018-09-29 | 2021-07-02 | 杭州电子科技大学 | Bidirectional chaotic communication system based on vertical surface laser |
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