CN112564792A - Free space optical communication safety system - Google Patents
Free space optical communication safety system Download PDFInfo
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- CN112564792A CN112564792A CN202011384440.3A CN202011384440A CN112564792A CN 112564792 A CN112564792 A CN 112564792A CN 202011384440 A CN202011384440 A CN 202011384440A CN 112564792 A CN112564792 A CN 112564792A
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
Abstract
A free-space optical communication security system, comprising: at least two lasers for generating optical carriers of different wavelengths; the input port of the optical switch is connected with the laser, and the optical switch is used for controlling the communication state of the input port and the output port according to the frequency hopping sequence so as to realize the jump of optical carriers among different wavelengths; the optical switch output port is sequentially connected with a modulator, a first optical fiber coupling mirror and a first spatial light modulator, wherein the modulator is used for modulating data onto optical carriers, the first optical fiber coupling mirror is used for converting the optical carriers into spatial light, and the first spatial light modulator is used for carrying out OAM hopping on the spatial light according to a frequency hopping sequence and outputting corresponding OAM light beams; the combiner is used for converging each OAM light beam into a light signal; the second spatial light modulator is used for separating different OAM state channels of the optical signal under the control of the frequency hopping sequence so as to output spatial Gaussian light; and the demodulation device is used for demodulating the spatial Gaussian light to obtain data.
Description
Technical Field
The present disclosure relates to the field of free space optical communication security, and more particularly, to a free space optical communication security system.
Background
With the development of free space optical communication technology, social progress and economic development are greatly promoted. Various multiplexing techniques for increasing the channel transmission capacity are not available. Orbital Angular Momentum (OAM) beam having a helical phase factor
The light beams in different OAM states (different azimuth indexes 1) which are coaxially transmitted can be effectively separated, so that the development potential of the optical fiber coupler in the space division multiplexing technology is huge. Meanwhile, with the frequent occurrence of various user information leakage events around the world in recent years, the risk that user data is stolen by an illegal third party in transmission is increased.
In the existing secure communication mechanism, the most common method is to encrypt the user data by using an algorithm at a software layer. However, as computing power has increased, the security of this approach has also begun to be compromised.
Disclosure of Invention
Technical problem to be solved
In view of the prior art problems, the present disclosure proposes a free space optical communication security system for at least partially solving the above technical problems.
(II) technical scheme
The present disclosure provides a free space optical communication security system, comprising: at least two lasers for generating optical carriers of different wavelengths; each input port of the n × n optical switch is connected with one laser, the n × n optical switch is used for controlling the communication state of the input port and the output port of the n × n optical switch according to a first frequency hopping sequence so as to realize the jump of optical carriers output by the output port among different wavelengths, wherein n is more than or equal to 2; each output port of the nxn optical switch is sequentially connected with a modulator, a first optical fiber coupling mirror and a first spatial light modulator, wherein the modulator is used for modulating data onto optical carriers output by the output ports, the first optical fiber coupling mirror is used for converting the optical carriers carrying the data into spatial light, and the first spatial light modulator is used for carrying out OAM hopping modulation on the spatial light under the control of a second frequency hopping sequence and outputting corresponding OAM light beams; an input port of the combiner is connected with an output port of the first spatial light modulator and is used for converging the OAM light beams output by the first spatial light modulators into a light signal; the input port of the second spatial light modulator is connected with the output port of the combiner and is used for separating different OAM state channels of a beam of optical signals under the control of a second frequency hopping sequence so as to output spatial Gaussian light; and the demodulation device is used for demodulating the space Gaussian light to obtain data.
Optionally, the first spatial light modulator performs OAM hopping modulation on the spatial light according to the first group of holograms under the control of the second hopping sequence; the second spatial light modulator carries out OAM hopping modulation on the spatial light according to the second group of holograms under the control of the second frequency hopping sequence; the first group of holograms and the second group of holograms correspond to different OAM states, and the numerical value of the topological charge corresponding to the first group of holograms is opposite to the numerical value of the topological charge corresponding to the second group of holograms.
Optionally, the demodulation apparatus includes: the second fiber coupling mirror is used for realizing the conversion of the space Gaussian light from the free space to the optical fiber; the array waveguide grating is used for separating optical carriers with different wavelengths from the converted space Gaussian light; each port of the output optical carrier of the arrayed waveguide grating is sequentially connected with a synchronous control module and a photoelectric detector, and the synchronous control module is used for aligning the phases of data carried by the optical carriers with different wavelengths; the photoelectric detector is used for converting the optical carrier waves after the phase alignment into electric signals; and the data recovery module is used for recovering data from the electric signal under the control of the first frequency hopping sequence.
Optionally, the synchronous control module is configured to perform delay adjustment on the phase of the data in an optical fiber compensation manner, so as to achieve phase alignment between data carried by optical carriers with different wavelengths.
Optionally, the free space optical communication security system further comprises: and the pseudo-random number generator is used for generating the first frequency hopping sequence and the second frequency hopping sequence.
Optionally, the free space optical communication security system further comprises: a first optical antenna for transmitting a beam of optical signals to free space transmission; and the second optical antenna is used for receiving a beam of optical signals transmitted through the free space and forwarding the optical signals to the second spatial light modulator.
Optionally, the first spatial light modulator comprises a transmissive spatial light modulator or a reflective spatial light modulator; the second spatial light modulator comprises a transmissive spatial light modulator or a reflective spatial light modulator.
Optionally, the modulator comprises a mach-zehnder modulator.
Optionally, the switching time of the n × n optical switch is in the order of picoseconds.
Optionally, a synchronization header is added to each data in the process of modulating the data onto the optical carrier output by the output port by the modulator.
(III) advantageous effects
The present disclosure provides a free space optical communication security system, which at least has the following beneficial effects:
the system sets different channels at a sending end, firstly realizes wavelength hopping of optical carriers among different channels under the control of a frequency hopping sequence, then carries out OAM hopping modulation on space light under the control of the frequency hopping sequence, and leads data to be divided into segments in a time domain firstly by hopping data among different channels, and the segments are transmitted by different physical channels.
Drawings
Fig. 1 schematically illustrates a block diagram of a free space optical communication security system provided by an embodiment of the present disclosure;
fig. 2 schematically illustrates a data flow process diagram of a free space optical communication security system provided by an embodiment of the present disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The present disclosure provides a free space optical communication security system, which may be implemented based on hybrid optical frequency hopping of OAM multiplexing, including:
at least two lasers for generating optical carriers of different wavelengths.
Each input port of the n × n optical switch is connected with one laser, and the n × n optical switch is used for controlling the communication state of the input port and the output port of the n × n optical switch according to the first frequency hopping sequence so as to realize the jump of optical carriers output by the output port among different wavelengths.
Each output port of the nxn optical switch is sequentially connected with a modulator, a first optical fiber coupling mirror and a first spatial light modulator, wherein the modulator is used for modulating data onto optical carriers output by the output ports, the first optical fiber coupling mirror is used for converting the optical carriers carrying the data into spatial light, and the first spatial light modulator is used for carrying out OAM hopping modulation on the spatial light under the control of the second frequency hopping sequence and outputting corresponding OAM light beams.
And an input port of the combiner is connected with the output port of the first spatial light modulator, and the combiner is used for converging the OAM light beams output by the first spatial light modulators into a light signal.
And an input port of the second spatial light modulator is connected with an output port of the combiner and is used for separating different OAM state channels of one beam of optical signals under the control of the second frequency hopping sequence so as to output spatial Gaussian light.
And the demodulation device is used for demodulating the space Gaussian light to obtain data.
According to an embodiment of the present disclosure, the first spatial light modulator OAM hopping modulates the spatial light according to the first set of holograms under control of the second hopping sequence. And the second spatial light modulator carries out OAM hopping modulation on the spatial light according to the second group of holograms under the control of the second frequency hopping sequence. The first group of holograms and the second group of holograms correspond to different OAM states, and the numerical value of the topological charge corresponding to the first group of holograms is opposite to the numerical value of the topological charge corresponding to the second group of holograms.
According to an embodiment of the present disclosure, the demodulation apparatus may include, for example: and the second fiber coupling mirror is used for realizing the conversion of the spatial Gaussian light from the free space to the optical fiber. And the arrayed waveguide grating is used for separating optical carriers with different wavelengths from the converted space Gaussian light. Each port of the output optical carrier of the arrayed waveguide grating is sequentially connected with a synchronous control module and a photoelectric detector, and the synchronous control module is used for aligning the phases of the data carried by the optical carriers with different wavelengths; the photodetector converts the optical carrier wave after phase alignment into an electric signal. And the data recovery module is used for recovering data from the electric signal under the control of the first frequency hopping sequence.
The free-space optical communication security system of the present disclosure is described in detail below with reference to the specific figures. The following embodiment describes a free space optical communication security system by taking two channels as an example, it should be noted that the embodiment is only exemplary, the two channels are not used to limit the disclosure, the hopping principle of the multi-channel is similar to that of the two channels, and the implementation of the disclosure is not described in detail again.
Fig. 1 schematically shows a block diagram of a free space optical communication security system provided by an embodiment of the present disclosure.
As shown in fig. 1, according to an embodiment of the present disclosure, a free-space optical communication security system may include, for example:
the transmitting end S is internally provided with two lasers 1 with fixed wavelengths, a 2x2 optical switch 2, two modulators 3, two first optical fiber coupling mirrors 4, two first spatial light modulators 5 and a wave combiner 6. One laser 1 is connected to the first input port a of the 2x2 optical switch, and the other laser 1 is connected to the second input port b of the 2x2 optical switch 2. The first output port c of the 2x2 optical switch 2 is sequentially connected with a modulator 3, a first fiber coupling mirror 4 and a first spatial optical modulator 5, and the second output port d of the 2x2 optical switch 2 is sequentially connected with a modulator 3, a first fiber coupling mirror 4 and a first spatial optical modulator 5. Through the connection mode, two different channels are formed.
The receiving end R is internally provided with a second spatial light modulator 7, a second fiber coupling mirror 8, an arrayed waveguide grating 9, two synchronous control modules 10, two photodetectors 11 and a data recovery module 12. The second spatial light modulator 7 is connected with a second fiber coupling mirror 8 and an Arrayed Waveguide Grating (AWG) 9 in sequence. One output port of the arrayed waveguide grating 9 is connected with a synchronous control module 10 and a photoelectric detector 11, and the other output port is connected with a synchronous control module 10 and a photoelectric detector 11. The two photodetectors 11 are connected to a data recovery module 12.
According to an embodiment of the present disclosure, the two lasers 1 may be two fixed wavelength lasers, each outputting a wavelength λ1And λ2The first frequency hopping sequence (HS1) controls the connection state of the 2x2 optical switch 2, for example, when the sequence value is "0", the first input port a is connected to the first output port c, and the second input port b is connected to the second output port d; when the sequence value is "1", the first input port a is communicated with the second output port d, and the second input port b is communicated with the first output port c. That is, the wavelengths of the optical carriers output from the first output port c and the second output port d are at λ under the control of the first frequency hopping sequence1And λ2Jump in between. The two modulators 3 modulate the first DATA (DATA1) and the second DATA (DATA2) onto the optical carriers output by the first output port c and the second output port d, respectively, to realize one-step wavelength hopping, that is, the optical carriers of the first DATA and the second DATA are at λ1And λ2And rapidly jumps between.
According to the embodiment of the present disclosure, the modulated two optical carriers are coupled by two first fiber coupling mirrors 4(FCM), respectively, and converted into spatial light. The coupling efficiency of the first fiber coupling mirror 4 can be adjusted and optimized by adjusting the displacement and the pitch angle of the coupling mirror in the three directions of XYZ. Under the control of the second frequency hopping sequence (HS2), by dynamically loading the first group of holograms a on the two first spatial light modulators 5, data signals randomly loaded on different wavelengths can be further transmitted through different OAM channels, so that two-stage hopping among different OAM signals is realized, and the two first spatial light modulators 5 output corresponding OAM beams. In order to aggregate the light waves on the two links, the light waves modulated by the two first spatial light modulators 5 enter a combiner (BC). And then fed into free space via the first optical antenna 13 for transmission in the form of spatial free light FSO. Due to performance differences between different channels, the sending end needs to perform grouping processing on the first data and the second data, and adds a synchronization header in front of each group of data to ensure that the data realizes phase alignment at the receiving end through the synchronization control module 10 (SC).
According to the embodiment of the present disclosure, at the receiving end, a beam of received optical signals is received by the second optical antenna 14, and sent to the second spatial light modulator 7, and the second spatial light modulator 7 can be controlled by the second frequency hopping sequence (HS2), and the spatial light is subjected to OAM hopping modulation according to the second group of holograms B under the control of the second frequency hopping sequence (HS 2). The first group of holograms and the second group of holograms correspond to different OAM states, and the numerical value of the topological charge corresponding to the first group of holograms and the second group of holograms is opposite to the numerical value of the topological charge corresponding to the second group of holograms. Therefore, the separation of different OAM state channels is realized, and spatial Gaussian light is output. The space Gaussian light passes through the second optical fiber coupling mirror 8, so that the space Gaussian light is rapidly converted from a free space to an optical fiber, and is transmitted to the arrayed waveguide grating 9 through the optical fiber. The arrayed waveguide grating 9 separates two light waves with different wavelengths, and the two light waves are respectively subjected to synchronous control processing such as delay adjustment and the like by the two synchronous control modules 10, and then are sent to the two photoelectric detectors 11 for photoelectric conversion, and two paths of data signals are output. The data recovery module 12 recovers two data signals, the first data and the second data, under the control of the first frequency hopping sequence (HS 1).
According to implementations of the present disclosure, a free-space optical communication security system may further include: and the pseudo-random number generator is used for generating the first frequency hopping sequence and the second frequency hopping sequence.
According to the implementation of the present disclosure, the synchronization control module 10 may perform delay adjustment on the phase of the data in an optical fiber compensation manner, so as to achieve phase alignment between data carried by optical carriers with different wavelengths.
In accordance with implementations of the present disclosure, the first spatial light modulator 5 may comprise a transmissive spatial light modulator or a reflective spatial light modulator. The second spatial light modulator 7 may comprise a transmissive spatial light modulator or a reflective spatial light modulator.
According to implementations of the present disclosure, the modulator 3 may comprise a mach-zehnder modulator.
According to the implementation of the disclosure, the switching time of the 2 × 2 optical switch can be in picosecond level, and the fast jump of the optical carrier is realized through the high speed of the high-speed optical switch, so that the safety of data transmission is further improved.
Fig. 2 schematically illustrates a data flow process diagram of a free space optical communication security system provided by an embodiment of the present disclosure.
As shown in fig. 2, in the process of transmitting the first data and the second data through the free space optical communication security system shown in fig. 1, the free space optical communication security system causes the first data and the second data to be firstly divided into segments in the time domain by hopping between different channels, and the segments are transmitted through different physical channels.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A free-space optical communication security system, comprising:
at least two lasers for generating optical carriers of different wavelengths;
each input port of the n × n optical switch is connected with one laser, the n × n optical switch is used for controlling the communication state of the input port and the output port of the n × n optical switch according to a first frequency hopping sequence so as to realize the jump of optical carriers output by the output port among different wavelengths, wherein n is more than or equal to 2;
each output port of the nxn optical switch is sequentially connected with a modulator, a first optical fiber coupling mirror and a first spatial light modulator, wherein the modulator is used for modulating data onto an optical carrier output by the output port, the first optical fiber coupling mirror is used for converting the optical carrier carrying the data into spatial light, and the first spatial light modulator is used for performing orbital angular momentum hopping modulation on the spatial light under the control of a second frequency hopping sequence and outputting a corresponding orbital angular momentum light beam;
an input port of the combiner is connected with an output port of the first spatial light modulator, and the combiner is used for converging the orbital angular momentum beams output by the first spatial light modulators into a beam of optical signal;
the input port of the second spatial light modulator is connected with the output port of the combiner and is used for separating different orbital angular momentum state channels of the light signal under the control of the second frequency hopping sequence so as to output spatial Gaussian light;
and the demodulating device is used for demodulating the space Gaussian light to obtain the data.
2. The free-space optical communication security system of claim 1 wherein the first spatial light modulator performs orbital angular momentum hopping modulation of the spatial light according to a first set of holograms under control of a second frequency hopping sequence;
the second spatial light modulator carries out orbital angular momentum hopping modulation on the spatial light according to a second group of holograms under the control of a second frequency hopping sequence;
the first group of holograms and the second group of holograms correspond to different orbital angular momentum states, and the numerical value of the topological charge corresponding to the first group of holograms is opposite to the numerical value of the topological charge corresponding to the second group of holograms.
3. The free-space optical communication security system of claim 1, wherein the demodulation means comprises:
the second fiber coupling mirror is used for realizing the conversion of the space Gaussian light from free space to optical fiber;
the array waveguide grating is used for separating the optical carriers with different wavelengths from the converted space Gaussian light;
each port of each output optical carrier of the arrayed waveguide grating is sequentially connected with a synchronous control module and a photoelectric detector, and the synchronous control module is used for aligning the phases of the data carried by the optical carriers with different wavelengths; the photoelectric detector is used for converting the optical carrier waves after the phases are aligned into electric signals;
and the data recovery module is used for recovering the data from the electric signal under the control of the first frequency hopping sequence.
4. The free-space optical communication security system of claim 3, wherein the synchronization control module is configured to perform delay adjustment on the phase of the data by using fiber compensation, so as to achieve phase alignment between the data carried by the optical carriers with different wavelengths.
5. The free-space optical communication security system of claim 1, wherein the free-space optical communication security system further comprises:
a pseudo-random number generator for generating the first and second hopping sequences.
6. The free-space optical communication security system of claim 1, wherein the free-space optical communication security system further comprises:
a first optical antenna for sending the beam of optical signals to a free space transmission;
and the second optical antenna is used for receiving a beam of optical signals transmitted through a free space and forwarding the optical signals to the second spatial light modulator.
7. The free-space optical communication security system of any one of claims 1-6, wherein the first spatial light modulator comprises a transmissive spatial light modulator or a reflective spatial light modulator;
the second spatial light modulator comprises a transmissive spatial light modulator or a reflective spatial light modulator.
8. The free-space optical communication security system of any one of claims 1-6, wherein the modulator comprises a Mach-Zehnder modulator.
9. The free-space optical communication security system of any one of claims 1-6, wherein the on-off time of the nxn optical switch is in the order of picoseconds.
10. The free-space optical communication security system of any one of claims 1-6 wherein a synchronization header is added to each of the data during the modulation of the data by the modulator onto the optical carrier output by the output port.
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| CN113411127A (en) * | 2021-06-24 | 2021-09-17 | 中国科学院半导体研究所 | Optical frequency hopping communication system based on OAM multiplexing |
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Application publication date: 20210326 |