CN116015446A - High-speed laser communication turbulence channel transmission optimization system and method - Google Patents
High-speed laser communication turbulence channel transmission optimization system and method Download PDFInfo
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Abstract
The invention provides a high-speed laser communication turbulence channel transmission optimization system, which comprises: the method comprises the steps of generating a continuous light source module, a first modulation signal module, a compression pulse module, a nonlinear dispersion displacement optical fiber module, a coarse wavelength division multiplexing module, an optical time division multiplexing module, a first spatial light modulation module, a second spatial light modulation module, a detector and a computer. On the premise of ensuring multi-dimensional multiplexing high-speed optical communication, the OAM beam and partial coherent modulation are organically combined to generate the partial coherent OAM beam with a certain inhibiting effect on atmospheric turbulence effect, so that the sensitivity is remarkably improved, the error rate is reduced, and meanwhile, the whole optical communication link is optimized, so that the stability of the transmission of the laser communication link in a turbulence channel is improved.
Description
Technical Field
The invention relates to the technical field of laser communication, in particular to a system and a method for optimizing turbulent channel transmission of high-speed laser communication.
Background
Compared with the traditional microwave communication, the laser communication has the characteristics of high bandwidth, small beam divergence angle, electromagnetic interference resistance and the like, and has the advantages of higher transmission rate, better communication confidentiality and the like. Laser communication is widely used in the communication field.
The laser is transmitted in free space, and because the atmosphere in free space is always in a motion state, the space laser communication is disturbed by turbulence in the transmission process of the atmosphere to generate facula distortion and light intensity fluctuation, so that the defects of receiving power jitter, bit error rate increase, sensitivity reduction and the like are caused. The improvement of the utilization of spectrum resources, the increase of channel capacity and the suppression of turbulence effect become key problems in the field of space optical communication. In recent years, the emerging laser beam carrying Orbital Angular Momentum (OAM) is touted, the orthogonality of the laser beam provides a new degree of freedom for the traditional optical communication, the channel capacity is greatly expanded, and the effect of suppressing the weak atmospheric turbulence effect is also a few, but the atmospheric turbulence effect is still an important problem to be solved in the current space laser communication like the traditional laser communication.
The above problems are currently in need of solution.
Disclosure of Invention
The present invention overcomes at least one of the above-mentioned shortcomings of the prior art by providing, in one aspect, a high speed laser communication turbulent channel transmission optimization system comprising: generating a continuous light source module, a first modulation signal module, a compression pulse module, a nonlinear dispersion displacement optical fiber module, a coarse wavelength division multiplexing module, an optical time division multiplexing module, a first spatial light modulation module, a second spatial light modulation module, a detector and a computer; the continuous light generating light source module is used for generating continuous light and sending the continuous light to the modulation signal module; the modulation signal module is used for modulating the received continuous optical signals; the compressed pulse module is used for receiving the modulated continuous optical signal and acquiring a pulse signal thereof; the nonlinear dispersion shift optical fiber module is used for generating a partial coherent supercontinuum based on the received pulse signal; the coarse wavelength division multiplexing module is used for generating wide-spectrum laser carrying high-speed information based on the partial coherent supercontinuum; the optical time division multiplexing module is used for performing time division multiplexing on the broad spectrum laser carrying high-speed information; the first spatial light modulation module is used for generating an orbital angular momentum beam based on the wide-spectrum laser after time division multiplexing under the control of a computer; the second spatial light modulation module is used for demodulating the orbital angular momentum beam under the control of a computer; the detector is used for detecting the demodulated orbital angular momentum beam, generating a detection result and sending the detection result to the computer for storage.
Optionally, an amplifier module is connected to the back of the compressed pulse module, and is used for amplifying the pulse signal and sending the amplified pulse signal to a nonlinear dispersion displacement optical fiber.
Optionally, the coarse wavelength division multiplexing module is further used as a filter pair to obtain a broad spectrum laser based on the partial coherence supercontinuum; generating broad spectrum laser carrying high-speed information based on the broad spectrum laser.
Optionally, the coarse wavelength division multiplexing module further includes a second modulation signal module, configured to modulate the broad spectrum laser to generate a broad spectrum laser carrying high-speed information.
Optionally, the optical time division multiplexing module equally receives the broad spectrum laser signal carrying high-speed information through the built-in optical coupler 4, wherein three optical delay lines are respectively connected with different single-mode optical fibers, the fourth optical delay line compensates the power attenuation caused by the optical delay lines, and all signals are coupled together through another built-in optical coupler.
Optionally, the first spatial light modulator module includes: a first spatial light modulator, a second spatial light modulator, and a first polarization splitting prism; the two halves of the light beam passing through the optical time division multiplexing module respectively modulate the phase image to the first spatial light modulator and the second spatial light modulator through a computer to generate an orbital angular momentum light beam; and carrying out polarization multiplexing on the orbital angular momentum beam by a first polarization splitting prism, and then transmitting the orbital angular momentum beam into a medium and weak turbulence environment.
Optionally, the second spatial light modulator module includes: a third spatial light modulator, a fourth spatial light modulator, and a second polarization splitting prism; after the orbital angular momentum beam passes through a medium-weak turbulence environment, performing depolarization multiplexing on the orbital angular momentum beam by a second polarization splitting prism; the phase image of the orbital angular momentum beam of the opposite mode is modulated into a third spatial light modulator and a fourth spatial light modulator by a computer to demodulate the orbital angular momentum beam.
Optionally, a modulator module is further connected behind the second spatial light modulation module, and is suitable for performing optical time division demultiplexing on the demodulated orbital angular momentum beam.
Optionally, the modulator module includes a first modulator, a second modulator and a coupler; the device is suitable for coupling and transmitting the time-resolved and multiplexed orbital angular momentum light beams to a detector.
On the other hand, the invention also provides a method for optimizing the transmission of the turbulent channel of the high-speed laser communication, which comprises the following steps: generating continuous light based on the generated continuous light source module and transmitting the continuous light to the modulation signal module; the modulation signal module modulates the received continuous optical signals; the compressed pulse module receives the modulated continuous optical signal and acquires a pulse signal thereof; the nonlinear dispersion shift optical fiber module generates a partially coherent supercontinuum based on the pulse signal; the coarse wavelength division multiplexing module generates wide-spectrum laser carrying high-speed information based on the partial coherent supercontinuum; the optical time division multiplexing module performs time division multiplexing on the broad spectrum laser carrying high-speed information; the first spatial light modulation module generates an orbital angular momentum beam based on the broad spectrum laser after time division multiplexing under the control of a computer; the second spatial light modulation module demodulates the orbital angular momentum beam under the control of a computer; the detector is used for detecting the demodulated orbital angular momentum beam, generating a detection result and sending the detection result to the computer for storage.
In yet another aspect, the present invention further provides a computer readable storage medium having one or more instructions stored therein, where the computer instructions are configured to cause the computer to perform the above-described method for optimizing turbulent channel transmission for high-speed laser communication.
In yet another aspect, the present invention provides an electronic device, including: a memory and a processor; at least one program instruction is stored in the memory; the processor is configured to implement the above-described method for optimizing turbulent channel transmission for high-speed laser communication by loading and executing the at least one program instruction.
The beneficial effects of the invention are as follows: the invention relates to a high-speed laser communication turbulence channel transmission optimization system, which comprises: generating a continuous light source module, a first modulation signal module, a compression pulse module, a nonlinear dispersion displacement optical fiber module, a coarse wavelength division multiplexing module, an optical time division multiplexing module, a first spatial light modulation module, a second spatial light modulation module, a detector and a computer; the continuous light generating light source module is used for generating continuous light and sending the continuous light to the modulation signal module; the modulation signal module is used for modulating the received continuous optical signals; the compressed pulse module is used for receiving the modulated continuous optical signal and acquiring a pulse signal thereof; the nonlinear dispersion shift optical fiber module is used for generating a partial coherent supercontinuum based on the received pulse signal; the coarse wavelength division multiplexing module is used for generating wide-spectrum laser carrying high-speed information based on the partial coherent supercontinuum; the optical time division multiplexing module is used for performing time division multiplexing on the broad spectrum laser carrying high-speed information; the first spatial light modulation module is used for generating an orbital angular momentum beam based on the wide-spectrum laser after time division multiplexing under the control of a computer; the second spatial light modulation module is used for demodulating the orbital angular momentum beam under the control of a computer; the detector is used for detecting the demodulated orbital angular momentum beam, generating a detection result and sending the detection result to the computer for storage. The method adopts a mode of organically combining partial coherent modulation and light beams carrying orbital angular momentum to further improve the performance of the whole high-speed laser communication link, optimize the space laser transmission and realize the stable operation of the laser communication link under a turbulent flow channel.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a block diagram of a system for optimizing turbulent channel transmission in high-speed laser communication according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method for optimizing turbulent channel transmission in high-speed laser communication according to an embodiment of the present invention.
Fig. 3 is a partial block diagram of an electronic device provided by an embodiment of the invention.
The reference numerals are as follows:
generating a continuous light source module-1;
a first modulated signal module-2;
a compressed pulse module-3;
nonlinear dispersion shifted fiber module-4;
a coarse wavelength division multiplexing module-5;
an optical time division multiplexing module-6;
a first spatial light modulation module-7;
a second spatial light modulation module-8;
a detector-9;
computer-10;
a modulator module-11;
a first spatial light modulator-701;
a second spatial light modulator-702;
a first polarization splitting prism-703;
a first fiber collimator-704;
a first coupler-705;
a third spatial light modulator-801;
a fourth spatial light modulator-802;
a second polarization splitting prism 803;
a light collimator-804;
a first modulator-1101;
a second modulator-1102;
and a second coupler 1103.
Detailed Description
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to facilitate the subsequent understanding, terms of art that may appear in the following embodiments are explained herein:
orbital angular momentum: (Orbital angular momentum, OAM) recent studies have shown that a light beam has two kinds of angular momentums, one is an angular momentum due to polarization characteristics of the light beam and the other is an orbital angular momentum due to a spiral phase structure, and when the light beam has an angular dependent phase distribution (twist phase or spiral phase), such a light beam has an angular momentum related to the angular phase distribution, which is called orbital angular momentum.
Time division multiplexing: (Time Division Multiplexing, TDM) time division multiplexing is suitable for the transmission of digital signals. Since the bit rate of the channel exceeds the data rate of each signal, the channel can be used for multiple signals in a time-division, alternating manner. Each time slice is occupied by a multiplexed signal, and a plurality of digital signals can be transmitted and arrived as required within a specified time, so that the transmission of a plurality of digital signals on one physical channel is realized.
Spatial light modulator: (Spatlal Light Modulator, SLM) is a device that modulates the spatial distribution of light waves. Spatial light modulators are composed of a plurality of individual cells that are spatially arranged in a one-dimensional or two-dimensional array, each cell being independently controllable by an optical or electrical signal and changing its optical properties in response to the signal, thereby modulating the light wave illuminated thereon.
The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
Example 1
Referring to fig. 1, a system for optimizing turbulent channel transmission in high-speed laser communication according to an embodiment of the present invention includes: a continuous light source module 1, a first modulation signal module 2, a compression pulse module 3, a dispersion shift optical fiber module 4, a coarse wavelength division multiplexing module 5, an optical time division multiplexing module 6, a first spatial light modulation module 7, a second spatial light modulation module 8, a detector 9 and a computer 10 are generated.
For the purpose of facilitating the subsequent understanding, the general inventive concept of the present invention is set forth herein:
generating narrow linewidth continuous light at the front end, loading and amplifying signals, pumping compressed pulses, introducing dispersion displacement optical fibers to generate super-continuous spectrums, obtaining wide-spectrum light through coarse wavelength division multiplexing, improving communication speed through optical time division multiplexing, generating OAM light beams after 2-division light, performing polarization multiplexing, entering a medium-weak turbulence environment, performing polarization multiplexing, demodulating the OAM light beams, and transmitting data to a computer through a detector after beam combination.
Specific examples are as follows:
as an example, the continuous light generating light source module 1 is configured to generate continuous light and transmit the same to the modulation signal module 2.
As an example, the modulation signal module 2 is configured to modulate a received continuous optical signal.
As an example, the compressed pulse module 3 is configured to receive the modulated continuous optical signal and acquire a pulse signal thereof.
As an example, the nonlinear dispersion shifted fiber module 4 is configured to generate a partially coherent supercontinuum based on the received pulse signal.
Optionally, an amplifier module is connected to the back of the compressed pulse module 3, and is configured to amplify the pulse signal and send the amplified pulse signal to a nonlinear dispersion shift optical fiber, where the amplifier module is configured with an amplifier. The continuous light source is a narrow linewidth light source, a modulation signal is required to be generated through an Arbitrary Waveform Generator (AWG) and modulated by a Mach-Zehnder modulator (MZM), continuous light is generated by the continuous light source module 1 and enters a modulation signal module 2 to load signals, a wavelength division multiplexer connected with the compressed pulse module 3 through a 1455nm Laser Diode (LD) is used for obtaining pulse signals, the pulse signals are amplified by an amplifier (EDFA) and then pass through a nonlinear dispersion displacement optical fiber module 4, and a partial coherent supercontinuum is generated by the non-dispersion displacement optical fiber module 4.
As an example, the coarse wavelength division multiplexing module 5 is configured to generate a broad spectrum laser carrying high-speed information based on a partially coherent supercontinuum.
Optionally, the coarse wavelength division multiplexing module 5 is further configured to obtain, as a filter pair, a broad spectrum laser based on a partially coherent supercontinuum; generating broad spectrum laser carrying high-speed information based on the broad spectrum laser. The coarse wavelength division multiplexing module 5 further comprises a second modulation signal module, which is used for modulating the broad spectrum laser to generate broad spectrum laser carrying high-speed information.
As an example, the optical time division multiplexing module 6 is configured to time division multiplex the broad spectrum laser light carrying high-speed information.
Optionally, the optical time division multiplexing module 6 equally receives the broad spectrum laser signal carrying high-speed information through the built-in optical coupler 4, wherein three optical delay lines are respectively connected with different single-mode optical fibers, the fourth attenuator compensates the power attenuation caused by the optical delay lines, and all signals are coupled together through another built-in optical coupler. Specifically, the optical time division multiplexing module 6 is used for splitting optical signals by using the 1X4 optical coupler 4, wherein three Optical Delay Lines (ODLs) are respectively connected with different single mode optical fibers (SMFs), the fourth attenuator compensates power attenuation caused by the ODLs, all signals are coupled together by using another optical coupler, so that time division multiplexing of broad spectrum laser carrying high-speed information is completed, and the propagation rate of the optical signals can be further improved by time division multiplexing of broad spectrum laser carrying high-speed information.
As an example, the first spatial light modulation module 7 is configured to generate an orbital angular momentum beam based on the broad spectrum laser light subjected to time division multiplexing under the control of the computer 10.
Optionally, the first spatial light modulator module 7 includes: a first spatial light modulator 701, a second spatial light modulator 702, and a first polarization splitting prism 703; the two halves of the light beam passing through the optical time division multiplexing module 6 modulate the phase image to the first spatial light modulator 701 and the second spatial light modulator 702 respectively through a computer to generate an orbital angular momentum light beam, hereinafter referred to as an OAM light beam, and the OAM light beam is polarization multiplexed by the first polarization splitting prism 703 and then is transmitted into a medium and weak turbulence environment. Specifically, the first spatial light modulator module 7 further includes two first optical fiber collimators 704 for transmitting the optical signals output from the optical time division multiplexing module 6 to the spatial light, that is, transmitting the light output from the optical time division multiplexing module 6 to the first spatial light modulator 701 and the second spatial light modulator 702, respectively. After the light beam passing through the optical time division multiplexing module 6 passes through the first coupler 705, the two halves modulate the phase image into the first spatial light modulator 701 and the second spatial light modulator 702 respectively through the computer 10 to generate an OAM light beam, and then the OAM light beam is subjected to polarization multiplexing through the polarization beam splitter prism 703, so that the speed of the light signal is further improved, and the OAM light beam is transmitted into a medium-weak turbulence environment.
As an example, the second spatial light modulation module 8 is configured to demodulate the orbital angular momentum beam under the control of the computer 10.
Optionally, the second spatial light modulator module 8 includes: a third spatial light modulator 801, a fourth spatial light modulator 802, and a second polarization splitting prism 803; after the orbital angular momentum beam passes through the medium-weak turbulence environment, the orbital angular momentum beam is subjected to polarization demultiplexing by a second polarization splitting prism 803; the OAM beam phase images of the opposite modes are modulated into the third spatial light modulator 801 and the fourth spatial light modulator 802 through the computer 10 to demodulate the orbital angular momentum beam. Specifically, the second spatial light modulator module 8 further includes two second light collimators 804, which are configured to transmit the optical signals output by the third spatial light modulator 801 and the fourth spatial light modulator 802 to a mach-zehnder modulator (MZM), respectively.
Optionally, a modulator module 11 is further connected to the second spatial light modulation module 8, and is adapted to perform optical time division demultiplexing on the demodulated orbital angular momentum beam. The modulator module 11 includes a first modulator 1101, a second modulator 1102 and a second coupler 1103, and is adapted to couple and send the time-demultiplexed orbital angular momentum beam to the detector 9. Specifically, after the orbital angular momentum beam passes through the medium and weak turbulence environment, the second polarization splitting prism 803 performs polarization demultiplexing, and then the OAM phase image of the opposite mode is modulated into the third spatial light modulator 801 and the fourth spatial light modulator 802 through the computer 10 to demodulate the OAM beam, and then the demodulated OAM beam is transmitted into the MZM modulator to perform optical time division multiplexing.
As an example, the detector 9 is configured to detect the demodulated orbital angular momentum beam, generate a detection result, and send the detection result to the computer 10 for storage.
Optionally, the demodulated light beam is combined by a coupler and enters a detector to be detected, a detection result is generated, and finally the result is transmitted into the computer 10 to be stored.
On the premise of ensuring multi-dimensional multiplexing high-speed optical communication, the embodiment organically combines the OAM beam and the partial coherent modulation to generate the partial coherent OAM beam with a certain inhibiting effect on atmospheric turbulence effect, so that the sensitivity of optical signal transmission is remarkably improved, the error rate is reduced, and meanwhile, the whole optical communication link is optimized, so that the stability of the laser communication link in turbulent flow channel transmission is improved.
Example 2
Referring to fig. 2, the present embodiment provides a method for optimizing turbulent channel transmission of high-speed laser communication, which includes:
s210: the continuous light is generated based on the generated continuous light source module and transmitted to the modulation signal module.
S220: the modulation signal module modulates the received continuous optical signal.
S230: the modulated continuous optical signal is received based on the compressed pulse module, and a pulse signal of the modulated continuous optical signal is obtained.
S240: a nonlinear dispersion-shifted fiber based module generates a partially coherent supercontinuum based on the pulse signal.
S250: and generating broad-spectrum laser carrying high-speed information based on the partial coherent supercontinuum based on the coarse wavelength division multiplexing module.
S260: and carrying out time division multiplexing on the broad spectrum laser carrying the high-speed information based on an optical time division multiplexing module.
S270: the first spatial light modulation module is used for generating an orbital angular momentum beam based on the broad spectrum laser after time division multiplexing under the control of a computer.
S280: the orbital angular momentum beam is demodulated by control of the computer based on the second spatial light modulation module.
S290: and detecting the demodulated orbital angular momentum beam based on the detector, generating a detection result, and sending the detection result to a computer for storage.
Example 3
The embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a high-speed laser communication turbulence channel transmission optimization method, and the high-speed laser communication turbulence channel transmission optimization program realizes the step of optimizing the high-speed laser communication turbulence channel transmission when being executed by a processor. Because the storage medium adopts all the technical schemes of all the embodiments, the storage medium has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.
Example 4
Referring to fig. 3, an embodiment of the present invention further provides an electronic device, including: a memory and a processor; at least one program instruction is stored in the memory; the processor implements the high-speed laser communication turbulent channel transmission optimization method provided in embodiment 2 by loading and executing the at least one program instruction.
The memory 302 and the processor 301 are connected by a bus, which may include any number of interconnected buses and bridges, which connect together the various circuits of the one or more processors 301 and the memory 302. The bus may also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or may be a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 301 is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor 301.
The processor 301 is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 302 may be used to store data used by processor 301 in performing operations.
The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (10)
1. A turbulent channel transmission optimization system for high speed laser communication, the system comprising: generating a continuous light source module, a first modulation signal module, a compression pulse module, a nonlinear dispersion displacement optical fiber module, a coarse wavelength division multiplexing module, an optical time division multiplexing module, a first spatial light modulation module, a second spatial light modulation module, a detector and a computer;
the continuous light generating light source module is used for generating continuous light and sending the continuous light to the modulation signal module;
the modulation signal module is used for modulating the received continuous optical signals;
the compressed pulse module is used for receiving the modulated continuous optical signal and acquiring a pulse signal thereof;
the nonlinear dispersion displacement fiber module is used for generating a coherent supercontinuum based on the received pulse signal;
the coarse wavelength division multiplexing module is used for generating wide-spectrum laser carrying high-speed information based on the partial coherent supercontinuum;
the optical time division multiplexing module is used for performing time division multiplexing on the broad spectrum laser carrying high-speed information;
the first spatial light modulation module is used for generating an orbital angular momentum beam based on the wide-spectrum laser after time division multiplexing under the control of a computer;
the second spatial light modulation module is used for demodulating the orbital angular momentum beam under the control of a computer;
the detector is used for detecting the demodulated orbital angular momentum beam, generating a detection result and sending the detection result to the computer for storage.
2. The turbulent channel transmission optimizing system for high speed laser communication as claimed in claim 1, wherein an amplifier module is connected after the compressed pulse module for amplifying the pulse signal and transmitting to a nonlinear dispersion shift fiber.
3. The turbulent-channel transmission optimization system for high-speed laser communication as claimed in claim 1, wherein the coarse wavelength division multiplexing module is further used as a filter pair to obtain a broad-spectrum laser based on a partially coherent supercontinuum;
generating broad spectrum laser carrying high-speed information based on the broad spectrum laser.
4. The turbulent-flow channel transmission optimizing system for high-speed laser communication as claimed in claim 3, wherein the coarse wavelength division multiplexing module further comprises a second modulation signal module for modulating the broad-spectrum laser light to generate a broad-spectrum laser light carrying high-speed information.
5. The turbulent channel transmission optimizing system for high speed laser communication as claimed in claim 3, wherein the optical time division multiplexing module equally divides the received broad spectrum laser signal carrying high speed information through a built-in optical coupler 4, wherein three optical delay lines are respectively connected with different single mode optical fibers, and the fourth uses an attenuator to compensate the power attenuation caused by the optical delay lines, and then couples all signals together through another built-in optical coupler.
6. The high-speed laser communication turbulent-channel transmission optimization system of claim 1, wherein the first spatial light modulator module comprises: a first spatial light modulator, a second spatial light modulator, and a first polarization splitting prism;
the two halves of the light beam passing through the optical time division multiplexing module respectively modulate the phase image to the first spatial light modulator and the second spatial light modulator through a computer to generate an orbital angular momentum light beam;
and carrying out polarization multiplexing on the orbital angular momentum beam by a first polarization splitting prism, and then transmitting the orbital angular momentum beam into a medium and weak turbulence environment.
7. The high-speed laser communication turbulent-channel transmission optimization system of claim 1, wherein the second spatial light modulator module comprises: a third spatial light modulator, a fourth spatial light modulator, and a second polarization splitting prism;
after the orbital angular momentum beam passes through a medium-weak turbulence environment, performing depolarization multiplexing on the orbital angular momentum beam by a second polarization splitting prism;
the phase image of the orbital angular momentum beam of the opposite mode is modulated into a third spatial light modulator and a fourth spatial light modulator by a computer to demodulate the orbital angular momentum beam.
8. The turbulent channel transmission optimization system for high speed laser communication as claimed in claim 7, wherein a modulator module is further connected to the second spatial light modulation module, adapted to optically time-division multiplex the demodulated orbital angular momentum beam.
9. The high-speed laser communication turbulent-channel transmission optimization system as claimed in claim 7, wherein the modulator module comprises a first modulator, a second modulator and a coupler;
the device is suitable for coupling and transmitting the time-resolved and multiplexed orbital angular momentum light beams to a detector.
10. A method for optimizing turbulent channel transmission for high-speed laser communication, the method comprising:
generating continuous light based on the generated continuous light source module and transmitting the continuous light to the modulation signal module;
the modulation signal module modulates the received continuous optical signals;
receiving the modulated continuous optical signal based on the compressed pulse module and acquiring a pulse signal of the modulated continuous optical signal;
generating a partially coherent supercontinuum based on the pulse signal based on a nonlinear dispersion shifted fiber module;
generating broad spectrum laser carrying high-speed information based on a partial coherence supercontinuum based on a coarse wavelength division multiplexing module;
carrying out time division multiplexing on the broad spectrum laser carrying high-speed information based on an optical time division multiplexing module;
generating an orbital angular momentum beam based on the broad spectrum laser after time division multiplexing by the control of a computer based on the first spatial light modulation module;
demodulating the orbital angular momentum beam by control of a computer based on the second spatial light modulation module;
the detector is used for detecting the demodulated orbital angular momentum beam, generating a detection result and sending the detection result to a computer for storage.
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| CN117787021A (en) * | 2024-02-28 | 2024-03-29 | 中国人民解放军海军工程大学 | Laser far field energy density estimation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117787021A (en) * | 2024-02-28 | 2024-03-29 | 中国人民解放军海军工程大学 | Laser far field energy density estimation method |
| CN117787021B (en) * | 2024-02-28 | 2024-05-07 | 中国人民解放军海军工程大学 | Laser far field energy density estimation method |
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