CN112737693B - Fundamental order radial polarization laser multiplexing equipment for large-capacity space communication - Google Patents
Fundamental order radial polarization laser multiplexing equipment for large-capacity space communication Download PDFInfo
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- 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
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- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
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- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
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Abstract
The invention discloses fundamental-order radial polarization laser multiplexing equipment for high-capacity space communication, which comprises a signal encoder, a signal modulation module, a carrier signal transmitting module, a signal receiving module, a signal demodulation module and a signal decoder. The signal encoder converts information to be transmitted into an electric signal and transmits the electric signal to the signal modulation module, the carrier signal emission module emits radial polarized laser with middle infrared wavelength as a carrier signal, the signal modulation module transmits linear polarized laser with different polarization angles according to a control signal and transmits the linear polarized laser to the carrier signal, the signal receiving end receives the modulated carrier signal and transmits the modulated carrier signal to the signal demodulator, and the signal demodulator demodulates the signal, converts the signal into the electric signal and transmits the electric signal to the signal decoder to complete space communication. The invention uses radial polarization vector laser as carrier wave to carry out polarization multiplexing, overcomes the crosstalk in polarization beam coupling and transmission based on scalar beam carrier wave, and greatly expands the channel capacity at the same time.
Description
Technical Field
The invention belongs to the technical field of atmospheric laser communication, and particularly relates to fundamental-order radial polarization laser multiplexing equipment for high-capacity space communication.
Background
Atmospheric laser communication is a communication method for transmitting information by laser light through the atmosphere. It comprises two parts of sending and receiving, and the basic principle is that the carrier optical signal is used as transmission channel to complete point-to-point or point-to-multipoint information transmission by using the air as transmission channel. With the development and improvement of the technology, the atmospheric laser communication technology has become a popular technology of the current information technology.
The society has entered the "information age" at present, and the development of high and new science and technology marked by communication technology and computer technology has brought the change of day and night to people's life, and the information transmission between people is becoming more and more intimate, and the mode is also becoming diversified day by day simultaneously. However, with the increasing amount of communication traffic, the "radio windows" are becoming more crowded, and satellite communication using conventional microwave communication technology has not been able to meet the needs of future military and commercial services.
Compared with the traditional communication mode, the laser communication has the outstanding advantages of strong confidentiality and strong anti-interference capability. Compared with optical fiber communication, the atmospheric laser communication does not need optical fiber laying and maintenance; compared with microwave communication, the method does not need examination and approval of frequency use licenses, is not interfered by radio, and cannot meet the increasing communication requirements due to insufficient microwave frequency band resources, limited communication capacity, poor transmission directivity and the like in the conventional microwave communication technology.
In the existing laser polarization multiplexing equipment, two independent and mutually orthogonal polarization states of transmission wavelengths are used as independent channels to respectively transmit two paths of signals in the multiplexing mode, so that the information transmission capability of an optical fiber is doubled without increasing extra bandwidth resources. In the traditional polarization multiplexing equipment, two lasers with orthogonal polarization directions are adopted for carrying out co-channel transmission, polarization crosstalk is avoided, the channel capacity can only be expanded for a limited time, and only two paths of signals can be contained.
The method researches the space laser communication, provides a practical and effective space laser communication mode, has great value in the fields of national defense and commerce, and is beneficial to the steady development of the boosting laser technology.
Disclosure of Invention
In order to solve the above problems, the invention provides a fundamental order radial polarization laser multiplexing device for high-capacity space communication, which uses fundamental order radial polarization laser as a carrier signal, uses linear polarization lasers in different polarization directions as information carriers, performs intensity modulation on the linear polarization lasers in different polarization directions to load information, couples the linear polarization lasers with the information loaded in different polarization directions to the radial polarization laser, and realizes multi-dimensional information parallel transmission of a single channel.
In order to realize the purpose of the invention, the invention provides a fundamental order radial polarization laser multiplexing device for large-capacity space communication, and the device related to the multiplexing technology comprises a signal encoder, a signal modulation module, a carrier signal transmitting module, a signal receiving module, a signal demodulation module and a signal decoder;
the signal encoder converts information to be transmitted into an electric signal and transmits the electric signal to the signal modulation module, the carrier signal emission module emits radial polarized laser with middle infrared wavelength as a carrier signal, the signal modulation module sends linear polarized laser with different polarization angles according to a control signal and sends the linear polarized laser to the carrier signal, the signal receiving end receives the modulated carrier signal and sends the modulated carrier signal to the signal demodulator, and the signal demodulator demodulates the signal, converts the signal into the electric signal and sends the electric signal to the signal decoder to complete space communication;
the signal modulation module comprises a first modulatable laser, a second modulatable laser, a third modulatable laser, a fourth modulatable laser, a fifth modulatable laser, a sixth modulatable laser, a first polarizing film, a second polarizing film, a third polarizing film, a fourth polarizing film, a fifth polarizing film, a sixth polarizing film, a first total reflection mirror, a second total reflection mirror, a third total reflection mirror, a fourth total reflection mirror, a fifth total reflection mirror, a sixth total reflection mirror, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror and a sixth reflecting mirror;
the signal receiving module comprises a narrow band-pass filter, a first spectrometer, a second spectrometer, a third spectrometer, a fourth spectrometer and a fifth spectrometer;
the signal demodulation module comprises a seventh polaroid, an eighth polaroid, a ninth polaroid, a tenth polaroid, an eleventh polaroid, a twelfth polaroid, a first detector, a second detector, a third detector, a fourth detector, a fifth detector and a sixth detector.
The carrier signal transmitting module is a radial polarized light generating device, the radial polarized light generating device comprises a single-mode fiber laser, a one-way lens, a thulium-doped disordered gain medium, a single-side gold-plated reflective W-shaped axicon and an output coupling mirror, and the thulium-doped disordered gain medium is a Tm: CYA or Tm: CGA crystal.
The laser output by the carrier signal transmitting module is radial polarized laser which is mid-infrared laser, the wavelength is 1-14 microns, the maximum output power is 5 watts, the beam quality factor is larger than 2 and smaller than 2.3, and the light spot is an annular light spot.
The first modulatable laser, the second modulatable laser, the third modulatable laser, the fourth modulatable laser, the fifth modulatable laser and the sixth modulatable laser are high-performance current directly-modulated lasers, the output laser wavelength is consistent with the carrier signal wavelength, the laser phase is consistent with the carrier signal, the maximum output power is 1W, radio frequency signal control is supported, and the control rate is 10Gbps at most.
The first polarizer, the second polarizer, the third polarizer, the fourth polarizer, the fifth polarizer and the sixth polarizer are arranged in an array and are respectively arranged in the light emitting directions of the sixth tunable laser, the fifth tunable laser, the fourth tunable laser, the third tunable laser, the second tunable laser and the first tunable laser; the first total reflection mirror is positioned at the polarized light output end of the first polaroid, the second total reflection mirror is arranged at the polarized light output end of the second polaroid, the light ray input end of the third total reflection mirror is arranged at the polarized light output end of the third polaroid, the fourth total reflection mirror is arranged at the polarized light output end of the fourth polaroid, the fifth total reflection mirror is arranged at the polarized light output end of the fifth polaroid, and the sixth total reflection mirror is arranged at the polarized light output end of the sixth polaroid;
the first reflector, the second reflector, the third reflector, the fourth reflector, fifth reflector and sixth reflector set up in the light-emitting direction of carrier source, and first reflector is located the reflected light output at first full reflection mirror, the second reflector is located the reflected light output of second full reflection mirror, the third reflector is located the reflected light output of third full reflection mirror, the fourth reflector is located the reflected light output of fourth full reflection mirror, the fifth reflector is located the reflected light output of fifth full reflection mirror, the sixth reflector is located the reflected light output of sixth full reflection mirror.
The first polarizer, the second polarizer, the third polarizer, the fourth polarizer, the fifth polarizer, the sixth polarizer, the seventh polarizer, the eighth polarizer, the ninth polarizer, the tenth polarizer, the eleventh polarizer and the twelfth polarizer are all linear polarizers with a diameter of 12.5 mm, and amplitude components in corresponding polarization directions are reserved according to rotation directions.
The first reflector, the second reflector, the third reflector, the fourth reflector, the fifth reflector and the sixth reflector are plated with antireflection films on one side of a carrier signal, and are plated with an emission film on one side of a modulation signal.
The narrow band-pass filter is independent of polarization, and the working wavelength is consistent with the emission wavelength.
The first spectrometer, the fourth spectrometer and the fifth spectrometer are non-polarization beam splitters, and the beam splitting ratio is 50:50, the length, the width and the height are 5 mm; the second spectrometer and the third spectrometer are non-polarization beam splitters, and the beam splitting ratio is 70: 30, the length, width and height are 5 mm.
A working method of fundamental order radial polarization laser multiplexing equipment for large-capacity space communication comprises the following steps:
(1) the signal encoder converts the information to be transmitted into corresponding electric signals and transmits the electric signals to the signal modulation module;
(2) the carrier signal transmitting module generates radial polarization laser as a carrier signal;
(3) according to the electric signal generated by the signal encoder, the first modulatable laser, the second modulatable laser, the third modulatable laser, the fourth modulatable laser, the fifth modulatable laser and the sixth modulatable laser control the output of laser after receiving corresponding control instructions, when the modulatable laser is in an on state, the output laser is polarized by corresponding to a first polarizing film, a second polarizing film, a third polarizing film, a fourth polarizing film, a fifth polarizing film and a sixth polarizing film respectively, and the laser in a polarization state is transmitted to a corresponding first reflecting mirror, a corresponding second reflecting mirror, a corresponding third reflecting mirror, a corresponding fourth reflecting mirror, a corresponding fifth reflecting mirror and a corresponding sixth reflecting mirror and is coupled into a carrier signal; the modulatable laser in the off state does not emit laser, namely, the laser which is not subjected to polarization selection is coupled into a carrier signal;
(4) the modulated carrier signal is sent to a narrow band-pass filter, the narrow band-pass filter filters optical noise, the filtered signal light is sent to a first light splitter, the first light splitter sends the signal light to a second light splitter and a third light splitter respectively in equal proportion without changing the polarization state, the third light splitter divides the input laser into two beams in 70 to 30 proportion, the light corresponding to 70 proportion is sent to a fourth light splitter, the fourth light splitter divides the input laser into two beams in equal proportion, the second light splitter divides the input laser into two beams in 70 to 30 proportion, the light corresponding to 70 proportion is sent to a fifth light splitter, and the fifth light splitter splits the incident laser in equal proportion;
(5) after the second beam splitting is performed, one path of split laser passes through a seventh polaroid, after the laser taking radial polarization laser as a carrier signal passes through the seventh polaroid, only the polarization direction is reserved as an amplitude component which is the same as the vertical direction, and the laser intensity of the corresponding component is measured by a first detector; the fifth spectrometer emits laser, wherein one path of laser is incident to an eighth polaroid, only an amplitude component which is deflected by 30 degrees in the vertical direction is reserved through the eighth polaroid, the intensity of the corresponding component laser is measured by a second detector, the other path of laser is incident to a ninth polaroid, only an amplitude component which is deflected by 60 degrees in the vertical direction is reserved, and the intensity of the corresponding component laser is measured by a third detector; splitting the incident laser by a third light splitter, wherein one laser beam is incident to a tenth polarizing film, only the amplitude component deflected by 90 degrees in the vertical direction is reserved, and the laser intensity of the corresponding component is measured by a fourth detector; the fourth spectrometer splits the incident laser, wherein one path of the incident laser is incident to an eleventh polaroid, only an amplitude component deflected by 120 degrees in the vertical direction is reserved through the eleventh polaroid, the laser intensity of a corresponding component is measured by a fifth detector, the other path of the incident laser is incident to a twelfth polaroid, only an amplitude component deflected by 150 degrees in the vertical direction is reserved, and the laser intensity of the corresponding component is measured by a sixth detector;
(6) the first detector, the second detector, the third detector, the fourth detector, the fifth detector and the sixth detector send the measured laser intensity information of the corresponding component to the signal decoder, and the signal decoder judges the information represented by the corresponding amplitude component according to whether the intensity of each amplitude component is greater than a certain value or not to finish decoding;
(7) after the signal is decoded, the signal is compiled into an original signal according to binary information, and space laser communication is completed;
the radial polarized light is a polarized light of which the electric vector vibration direction is always radial on the cross section of a light beam, and the mode of the polarized light is the solution of the wave equation under a cylindrical coordinate system. Radially polarized light beams are an important type of axially symmetric polarized light beams. For the axially symmetric polarized light, the outstanding characteristic is that the included angle between the vector direction of the electric field and the radial direction at any point on the cross section of the light beam is kept unchanged. Typical examples are radially polarized beams and circumferentially polarized beams, whose electric field vector direction is always parallel or perpendicular to the radial direction, respectively, at any point on the beam cross section.
The radial polarized light has an annular light spot mode distribution and belongs to an annular light beam mode. The ring beam mode is one of laser beam transmission modes. Unlike a common fundamental mode gaussian beam, the intensity distribution of the annular beam mode has an on-axis zero and the maximum intensity occurs in one revolution around the optical axis. For a radially polarized beam, the spatial distribution of its polarization is completely radial. Since the electric field vectors at the two ends with respect to the optical axis are exactly opposite in direction (i.e., have a phase difference of π), the light intensity distribution of its annular beam mode has an on-axis null.
Laser communication is a communication method for transmitting information using laser light. The space laser communication uses laser as a carrier, the frequency of the laser is very high and 3-4 orders of magnitude higher than that of microwave, the space laser communication has very large communication capacity, the communication speed of more than 10Gbps can be easily realized, the communication speed of more than Tbps can be obtained by adopting a multiplexing means, and the real-time transmission of mass data can be easily realized. In addition, the space laser communication also has the advantages of strong anti-interference capability, strong anti-interception capability, good safety and confidentiality, small volume, light weight, low power consumption and the like, and the communication quality is higher.
The atmospheric window refers to some wave bands which can penetrate the atmosphere in celestial radiation. Only celestial radiation within certain wavelength ranges can reach the ground due to absorption and reflection of radiation by various particles in the earth's atmosphere. The window is divided into an optical window, an infrared window and a radio window according to different ranges. The middle infrared band comprises a plurality of atmospheric windows, 1.4-1.9 μm, 60-95% of transmittance, 2.0-2.5 μm, about 80% of transmittance, 3.5-5.0 μm, 60-70% of transmittance, 8.0-14.0 μm of transmittance and about 80% of transmittance.
The polarization multiplexing equipment utilizes the polarization dimension of light, and simultaneously transmits two paths of independent data information through two mutually orthogonal polarization states of the light in the same wavelength channel to achieve the purposes of doubling the total capacity of a system and the utilization rate of a spectrum. In optical fiber communication, two independent and mutually orthogonal polarization states of transmission wavelengths are used as independent channels to respectively transmit two paths of signals, so that the information transmission capacity of the optical fiber is doubled without increasing additional bandwidth resources.
The traditional polarization multiplexing equipment adopts two independent and mutually orthogonal polarization states to respectively transmit two paths of signals, and the capacity expansion of a channel is restricted while the channel is expanded. Because of the unique property of polarization, if transmission is performed with non-orthogonal polarization states, information is damaged due to the mutual influence between the polarization states.
The radial polarization laser is used as a carrier signal, the signal is loaded on the linear polarization lasers with different polarizations through intensity modulation, the linear polarization lasers loaded with the signal are coupled into the radial polarization laser, in the radial polarization laser, the lasers with different polarization directions can not generate crosstalk, the respective polarization states are still independent, and the information is ensured to be lossless.
In the signal modulation module, the input end of the modulatable laser is controlled by the signal encoder in real time, the signal encoder controls the on-off of a power supply of the modulatable laser according to a control signal, the power supply is turned on, laser is emitted, certain power can be generated on corresponding amplitude components, the power supply indicates 1, the power supply is turned off, no laser is emitted, no power is generated on corresponding amplitude components, and the power supply indicates 0, so that the loading of signals is realized, the modulatable lasers corresponding to different polarization directions respectively carry out information loading, and the parallel transmission of multi-dimensional information is realized.
In the signal demodulation module, firstly, the modulated carrier signal is split, the polaroid is used for filtering light in other polarization directions, the light power in the corresponding polarization direction in a single polarization direction is measured, the comparison is carried out according to the light power value in the initial state, the light power value is higher than a certain value and is defined as 1, and the light power value is smaller than the certain value and is defined as 0. The radial polarized laser light is demodulated using a polarizing plate according to its characteristics, and the amplitude component in the direction corresponding to the polarizing plate is not affected.
Compared with the prior art, the invention has the following beneficial effects:
1. the application range is wide, when the fundamental-order radial polarization laser multiplexing equipment for high-capacity space communication is used, the fundamental-order radial polarization laser multiplexing equipment is not limited by specific wavelength, can be suitable for space laser communication with various wavelengths, and can effectively improve the channel capacity; the method has no applicable condition limitation, and can be used for laser communication between satellites, laser communication between grounds and laser communication between satellites and grounds.
2. The channel capacity is expanded, radial polarization laser is used as a carrier signal, laser multiplexing is carried out based on the radial polarization laser, the problem of crosstalk between lasers in different polarization directions is avoided, the channel capacity of atmospheric laser communication is greatly expanded, information can be carried in each polarization direction for optical communication, a plurality of paths of information can be obtained when coupling is carried out in each polarization direction, and the channel capacity is greatly expanded.
3. And multi-dimensional information parallel transmission, namely performing intensity modulation on the linear polarization lasers in different polarization directions to load information by taking the radial polarization lasers as carrier signals and the linear polarization lasers in different polarization directions as information carriers, and coupling the linear polarization lasers loaded with the information in different polarization directions to the radial polarization lasers to realize the multi-dimensional information parallel transmission of a single channel.
4. The method comprises the steps of enabling information to be lossless, using radial polarization laser as a carrier signal, loading signals on linear polarization lasers with different polarizations through intensity modulation, coupling the linear polarization lasers loaded with the signals into the radial polarization laser, enabling the lasers with different polarization directions not to generate crosstalk in the radial polarization laser, enabling the polarization states of the lasers to be independent, and guaranteeing information lossless.
Drawings
FIG. 1 is a schematic diagram of a fundamental order radial polarization laser multiplexing device for high capacity spatial communication according to an embodiment;
FIG. 2 is a schematic diagram of the coupling of vertically polarized linearly polarized laser light with radially polarized laser light for one embodiment;
FIG. 3 is a schematic diagram of an embodiment of decoding a radially polarized laser via a polarizer;
FIG. 4 is a schematic diagram of an exemplary apparatus for generating radially polarized laser light;
FIG. 5 is a schematic illustration of a spatial distribution of radially polarized laser light according to one embodiment.
In the figure: 1-signal encoder, 2-carrier source, 31-first modulatable laser, 32-second modulatable laser, 33-third modulatable laser, 34-fourth modulatable laser, 35-fifth modulatable laser, 36-sixth modulatable laser, 41-first polarizer, 42-second polarizer, 43-third polarizer, 44-fourth polarizer, 45-fifth polarizer, 46-sixth polarizer, 411-seventh polarizer, 421-eighth polarizer, 431-ninth polarizer, 441-tenth polarizer, 451-eleventh polarizer, 461-twelfth polarizer, 51-first total reflector, 52-second total reflector, 53-third total reflector, 54-fourth total reflector, 55-fifth total reflection mirror, 56-sixth total reflection mirror, 61-first mirror, 62-second mirror, 63-third mirror, 64-fourth mirror, 65-fifth mirror, 66-sixth mirror, 71-first spectrometer, 72-second spectrometer, 73-third spectrometer, 74-fourth spectrometer, 75-fifth spectrometer, 81-first detector, 82-second detector, 83-third detector, 84-fourth detector, 85-fifth detector, 86-sixth detector, 9-signal decoder, 10-narrow band-pass filter, 101-1700 nm wavelength single mode fiber laser, 102-one-way lens, 103-thulium-doped disordered gain medium, 104-reflective W-axis pyramid, 105-an output coupling mirror.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the present application and do not limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the relevant embodiments, nor are separate alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example one
The fundamental-order radial polarization laser multiplexing device for large-capacity space communication shown in fig. 1 comprises a signal encoder 1, a signal modulation module, a carrier signal transmitting module, a signal receiving module, a signal demodulation module and a signal decoder 9; the signal encoder 1 converts information to be transmitted into corresponding electric signals and transmits the electric signals to the signal modulation module; the carrier signal transmitting module generates radial polarized laser with the wavelength of 1970nm as a carrier signal; the signal modulation module generates a corresponding signal according to the electric signal sent by the signal encoder 1, the corresponding signal is polarized through a polarizing film to generate a corresponding modulated laser, the modulated laser is coupled into a carrier signal, the signal receiving module receives the corresponding laser and sends the laser to the corresponding signal demodulation module, the signal demodulation module sends the demodulated electric signal to the signal decoder 9, and the signal decoder 9 decodes the signal to complete atmosphere communication.
The signal modulation module comprises a first modulatable laser 31, a second modulatable laser 32, a third modulatable laser 33, a fourth modulatable laser 34, a fifth modulatable laser 35, a sixth modulatable laser 36, a first polarizer 41, a second polarizer 42, a third polarizer 43, a fourth polarizer 44, a fifth polarizer 45, a sixth polarizer 46, a first total reflection mirror 51, a second total reflection mirror 52, a third total reflection mirror 53, a fourth total reflection mirror 54, a fifth total reflection mirror 55, a sixth total reflection mirror 56, a first reflector 61, a second reflector 62, a third reflector 63, a fourth reflector 64, a fifth reflector 65 and a sixth reflector 66;
the first polarizer 41, the second polarizer 42, the third polarizer 43, the fourth polarizer 44, the fifth polarizer 45, and the sixth polarizer 46 are arranged in an array and are respectively disposed in the light-emitting directions of the sixth tunable laser 36, the fifth tunable laser 35, the fourth tunable laser 34, the third tunable laser 33, the second tunable laser 32, and the first tunable laser 31; a first total reflection mirror 51 is arranged at the polarized light output end of the first polarizer 41, a second total reflection mirror 52 is arranged at the polarized light output end of the second polarizer 42, a light ray input end of a third total reflection mirror 53 is arranged at the polarized light output end of the third polarizer 43, a fourth total reflection mirror 54 is arranged at the polarized light output end of the fourth polarizer 44, a fifth total reflection mirror 55 is arranged at the polarized light output end of the fifth polarizer 45, and a sixth total reflection mirror 56 is arranged at the polarized light output end of the sixth polarizer 46;
the first reflector 61, the second reflector 62, the third reflector 63, the fourth reflector 64, the fifth reflector 65 and the sixth reflector 66 are arranged in the light-emitting direction of the carrier source 2, the first reflector 61 is located at the reflected light output end of the first total reflecting mirror 51, the second reflector 62 is located at the reflected light output end of the second total reflecting mirror 52, the third reflector 63 is located at the reflected light output end of the third total reflecting mirror 53, the fourth reflector 64 is located at the reflected light output end of the fourth total reflecting mirror 54, the fifth reflector 65 is located at the reflected light output end of the fifth total reflecting mirror 55, and the sixth reflector 66 is located at the reflected light output end of the sixth total reflecting mirror 56.
The signal receiving module comprises a narrow band-pass filter 10, a first spectrometer 71, a second spectrometer 72, a third spectrometer 73, a fourth spectrometer 74 and a fifth spectrometer 75;
the signal demodulation module includes a seventh polarizer 411, an eighth polarizer 421, a ninth polarizer 431, a tenth polarizer 441, an eleventh polarizer 451, a twelfth polarizer 461, a first detector 81, a second detector 82, a third detector 83, a fourth detector 84, a fifth detector 85, and a sixth detector 86;
in the embodiment, the signal encoder 1 is a notebook computer, and a CPU is an AMD Ryzen 74800H and a 16G running memory;
the carrier source 2 has the wavelength of 1970nm, radial polarization laser and the maximum output power of 5 w;
the tunable laser 31 has the wavelength of 1970nm, the NEL (NTT) high-performance current direct-tuned laser has the speed of 10Gbps, the output power of PMF polarization-maintaining tail fiber is more than 50.0mW, and the SMA radio frequency female head is sealed in a butterfly way, is internally refrigerated and supports metropolitan area and long-distance application;
the second tunable laser 32 has a wavelength of 1970nm, a NEL (NTT) high-performance current direct-tuned laser, a 10Gbps rate, a PMF polarization-maintaining tail fiber output power of more than 50.0mW and an SMA radio frequency female head, is packaged in a butterfly shape, is internally refrigerated, and supports metropolitan area and long-distance application;
the third tunable laser 33 has a wavelength of 1970nm, a NEL (NTT) high-performance current direct-tuned laser, a 10Gbps rate, a PMF polarization-maintaining tail fiber output power of more than 50.0mW and an SMA radio frequency female head, is packaged in a butterfly shape, is internally refrigerated, and supports metropolitan area and long-distance application;
a fourth modulated laser 34 with a wavelength of 1970nm, an NEL (NTT) high-performance current direct-modulated laser with a rate of 10Gbps, an output power of PMF polarization-maintaining tail fiber of more than 50.0mW, an SMA radio frequency female head, a butterfly package, a refrigeration-in-package part and a support for metropolitan and long-distance application;
the fifth tunable laser 35 has a wavelength of 1970nm, a NEL (NTT) high-performance current direct-tuned laser, a 10Gbps rate, a PMF polarization-maintaining tail fiber output power of more than 50.0mW, and an SMA radio frequency female head;
a sixth modulatable laser 36 with a wavelength of 1970nm, a NEL (NTT) high-performance current direct-modulated laser, a 10Gbps rate, a PMF polarization-maintaining tail fiber output power of more than 50.0mW, an SMA radio frequency female head, a butterfly package, a refrigeration inside and a support for metropolitan area and long-distance application;
a first polaroid 41, a linear polaroid with the diameter of 12.5 mm, the working wavelength of 1500-;
the second polaroid 42 and the linear polaroid have the diameter of 12.5 mm, the working wavelength of 1500-;
the third polaroid 43, a linear polaroid, with the diameter of 12.5 mm, the working wavelength of 1500-;
a fourth polarizing film 44, a linear polarizing film, with a diameter of 12.5 mm, a working wavelength of 1500-;
a fifth polarizing film 45, a linear polarizing film, with a diameter of 12.5 mm, a working wavelength of 1500-;
a sixth polarizing film 46, a linear polarizing film, with a diameter of 12.5 mm, a working wavelength of 1500-;
a seventh polarizer 411, a linear polarizer, with a diameter of 12.5 mm, a working wavelength of 1500-;
an eighth polarizer 421, a linear polarizer with a diameter of 12.5 mm, a working wavelength of 1500-;
a ninth polaroid 431 with the diameter of 12.5 mm and the working wavelength of 1500-;
a tenth polarizing film 441, a linear polarizing film with a diameter of 12.5 mm, a working wavelength of 1500-;
an eleventh polaroid 451, a linear polaroid, with a diameter of 12.5 mm, a working wavelength of 1500-;
a twelfth polarizer 461, a linear polarizer with a diameter of 12.5 mm, a working wavelength of 1500-;
a first total reflection mirror 51, gold mirror, single-sided gold plating;
a second total reflection mirror 52, gold mirror, single-sided gold plated;
a third full-reflecting mirror 53, a gold mirror, and one-sided gold plating;
a fourth full-reflection mirror 54, a gold mirror, and one-sided gold plating;
a fifth total reflection mirror 55, a gold mirror, and single-side gold plating;
a sixth total reflection mirror 56, a gold mirror, single-sided gold plating;
one surface of the first reflector 61 is plated with an antireflection film with an effective wavelength of 2 microns, and the other surface is plated with a reflective film with an effective wavelength of 2 microns;
a second reflecting mirror 62, one surface of which is coated with an antireflection film and the effective wavelength of which is 2 microns, and the other surface of which is coated with a reflecting film and the effective wavelength of which is 2 microns;
a third reflector 63, one side of which is coated with an antireflection film and has an effective wavelength of 2 microns, and the other side of which is coated with a reflective film and has an effective wavelength of 2 microns;
a fourth reflector 64, one surface of which is plated with an antireflection film and has an effective wavelength of 2 μm, and the other surface of which is plated with a reflective film and has an effective wavelength of 2 μm;
a fifth reflector 65, one side of which is coated with an antireflection film and has an effective wavelength of 2 μm, and the other side of which is coated with a reflective film and has an effective wavelength of 2 μm;
a sixth reflector 66 having one surface coated with an antireflection film having an effective wavelength of 2 μm and the other surface coated with a reflective film having an effective wavelength of 2 μm;
the first spectrometer 71, 50:50 non-polarizing beam splitter cube, 1800-;
a second spectrometer 72, 30:70 non-polarizing beam splitter cube, 1800 + 2000nm, size height 5 mm;
a third spectrometer 73, 30:70 non-polarizing beam splitter cube, 1800 + 2000nm, size height 5 mm;
the fourth spectrometer 74, 50:50 non-polarizing beam splitter cube, 1800-;
a fifth spectrometer 75, 50:50 non-polarizing beam splitter cube 1800 and 2000nm, and the size is 5 mm;
the first detector 81, the indium gallium arsenic detector, 900-;
the second detector 82 is an indium-gallium-arsenic detector with the wavelength of 900-;
a third detector 83, an indium gallium arsenic detector, 900-;
a fourth detector 84, an indium gallium arsenic detector, 900-;
a fifth detector 85, an indium gallium arsenic detector, 900-;
a sixth detector 86, an indium gallium arsenic detector, 900-;
the signal decoder 9 is a notebook computer, and the CPU is an AMD Ryzen 74800H, 16G running memory;
a narrow band-pass filter 10 and a free space filter, wherein the diameter of the narrow band-pass filter is 3.5mm, and the working wavelength is 1900nm-2000nm;
the fundamental-order radial polarization laser multiplexing device for large-capacity space communication shown in fig. 1 comprises a signal encoder 1, a signal modulation module, a carrier signal transmitting module, a signal receiving module, a signal demodulation module and a signal decoder 9; the signal encoder 1 converts information to be transmitted into corresponding electric signals and transmits the electric signals to the signal modulation module; the carrier signal transmitting module generates radial polarized laser with the wavelength of 1970nm as a carrier signal; the signal modulation module generates a corresponding signal according to the electric signal sent by the signal encoder 1, the corresponding signal is polarized through a polarizing film to generate a corresponding modulated laser, the modulated laser is coupled into a carrier signal, the signal receiving module receives the corresponding laser and sends the laser to the corresponding signal demodulation module, the signal demodulation module sends the demodulated electric signal to the signal decoder 9, and the signal decoder 9 decodes the signal to complete atmosphere communication.
The signal modulation module described in this embodiment includes a first modulatable laser 31, a second modulatable laser 32, a third modulatable laser 33, a fourth modulatable laser 34, a fifth modulatable laser 35, a sixth modulatable laser 36, a first polarizer 41, a second polarizer 42, a third polarizer 43, a fourth polarizer 44, a fifth polarizer 45, a sixth polarizer 46, a first total reflection mirror 51, a second total reflection mirror 52, a third total reflection mirror 53, a fourth total reflection mirror 54, a fifth total reflection mirror 55, a sixth total reflection mirror 56, a first reflecting mirror 61, a second reflecting mirror 62, a third reflecting mirror 63, a fourth reflecting mirror 64, a fifth reflecting mirror 65, and a sixth reflecting mirror 66; according to an electric signal generated by the signal encoder, when the first modulatable light source receives an opening control instruction, the first modulatable light source emits laser with a wavelength of 1970nm, the laser with the wavelength of 3 microns passes through the first polarizing film 41, only linearly polarized light with the polarization direction coinciding with the vertical direction is reserved, the linearly polarized light is reflected to the first reflecting mirror 61 through the first reflecting mirror 51, and a carrier signal passes through the reflecting mirror 61 on the side coated with the antireflection film and is coupled with the linearly polarized light reflected by the reflecting mirror 61.
As shown in fig. 2, linearly polarized light with a vertical polarization direction is coupled with radially polarized laser light, and the light amplitude component of the radially polarized laser light in the vertical direction increases, that is, the intensity increases; the amplitude components of the other polarization directions are unchanged.
The first modulatable laser 31, the second modulatable laser 32, the third modulatable laser 33, the fourth modulatable laser 34, the fifth modulatable laser 35, and the sixth modulatable laser 36 perform similar operations after receiving corresponding control instructions, when the modulatable laser is in an on state, the output laser is polarized by a first polarizer 41, a second polarizer 42, a third polarizer 43, a fourth polarizer 44, a fifth polarizer 45 and a sixth polarizer 46 respectively, and the laser in a selected polarization state is transmitted to a corresponding first reflector 61, a second reflector 52, a third reflector 53, a fourth reflector 54, a fifth reflector 55 and a sixth reflector 56 by a corresponding first reflector 51, a second reflector 62, a third reflector 63, a fourth reflector 64, a fifth reflector 65 and a sixth reflector 66 and is coupled into a carrier signal; the modulatable laser in the off state does not emit laser, namely the laser without polarization is coupled into a carrier signal, and the modulatable laser can be switched on and off at the maximum frequency of 10G/s according to a control signal;
the signal receiving module described in this embodiment includes a narrow band-pass filter 10, a first spectrometer 71, a second spectrometer 72, a third spectrometer 73, a fourth spectrometer 74, a fifth spectrometer 75, a carrier signal is sent to the narrow band-pass filter 10, the narrow band-pass filter 10 filters out optical noise, and sends the filtered signal light to the first spectrometer 71, the first spectrometer 71 sends the signal light to the second spectrometer 72 and the third spectrometer 73 respectively in equal proportion without changing the polarization state, the third spectrometer 73 divides the input laser into two beams in proportion of 70 to 30, the light corresponding to 70 parts of the input laser beam is sent to a fourth spectrometer 74, the fourth spectrometer 74 divides the input laser beam into two equal parts of light and emits them, respectively, the second spectrometer 72 divides the input laser beam into two beams in a ratio of 70 to 30, light corresponding to 70 parts is sent to the fifth spectrometer 75, and the fifth spectrometer 75 splits the incident laser light in equal proportion;
the signal demodulation module described in this embodiment includes a seventh polarizer 411, an eighth polarizer 421, a ninth polarizer 431, a tenth polarizer 441, an eleventh polarizer 451, a twelfth polarizer 461, a first detector 81, a second detector 82, a third detector 83, a fourth detector 84, a fifth detector 85, and a sixth detector 86; after one of the beams of laser light split by the second spectrometer 72 passes through the seventh polarizer 411, and the laser light with the radial polarization laser light as a carrier signal passes through the seventh polarizer 411, only the polarization direction is kept as an amplitude component which is the same as the vertical direction, as shown in fig. 3, and the intensity of the laser light of the corresponding component is measured by the first detector 81.
The fifth spectrometer 75 emits laser light, one of the laser light enters the eighth polarizing plate 421, only an amplitude component deflected by 30 degrees from the vertical direction is retained through the eighth polarizing plate 421, the intensity of the corresponding component laser light is measured by the second detector 82, the other laser light enters the ninth polarizing plate 431, only an amplitude component deflected by 60 degrees from the vertical direction is retained, and the intensity of the corresponding component laser light is measured by the third detector 83. The third spectrometer splits the incident laser beam, wherein one laser beam is incident on the tenth polarizer 441, only the amplitude component deflected by 90 degrees from the vertical direction is retained, and the intensity of the corresponding component laser beam is measured by the fourth detector 84. The fourth spectrometer 74 splits the incident laser light, wherein one path of the incident laser light enters the eleventh polarizer 451, only the amplitude component deflected by 120 degrees from the vertical direction is reserved through the eleventh polarizer 451, the intensity of the corresponding component laser light is measured by the fifth detector 85, the other path of the incident laser light enters the twelfth polarizer 461, only the amplitude component deflected by 150 degrees from the vertical direction is reserved, and the intensity of the corresponding component laser light is measured by the sixth detector 83.
The first detector 81, the second detector 82, the third detector 83, the fourth detector 84, the fifth detector 85, and the sixth detector 86 transmit the measured laser intensity information of the corresponding component to the signal decoder, and the signal decoder determines the information indicated by the corresponding amplitude component according to whether the intensity of each amplitude component is greater than a certain value, and completes the decoding.
Example two
Fig. 4 shows a fundamental-order radial polarization laser generation device, which comprises a 1700nm wavelength single-mode fiber laser 101, a one-way lens 102, a thulium-doped disordered gain medium 103, a reflective W-shaped axicon 104 and an output coupling mirror 105.
A single mode fiber laser 101 with the wavelength of 1700nm and the wavelength of 1700nm, wherein the power of the single mode fiber laser is adjustable from 0W to 12W;
one side of the one-way lens 102 is plated with an antireflection film, the effective wavelength is 1680-1720 nm, and the other side is plated with a reflecting film, the effective wavelength is 2 mu m wave band;
a thulium-doped disordered gain medium 103, wherein Tm is a CYA crystal, and the length, width and height are 6mm 3 mm;
the reflecting W-shaped axicon 104 is made of glass and processed by a diamond turning process, the processing precision is 0.5mm, and gold is plated on the inner side;
an output coupling mirror 105 with an output efficiency of 5%;
the 1700nm wavelength single-mode fiber laser 101 generates 10W 1700nm laser, the 1700nm laser generates energy level transition through the thulium-doped disordered gain medium 103, photons after the energy level transition resonate in a resonant cavity formed by the one-way lens 102, the thulium-doped disordered gain medium 103, the reflective W-shaped axial pyramid 104 and the output coupling mirror 105 to generate laser with a wavelength of 1970nm, the laser with the wavelength of 1970nm forms radial polarized laser through secondary reflection in the reflective W-shaped axial pyramid 104, the radial polarized laser reflects 5% of the radial polarized laser output at the output coupling mirror 105 through the thulium-doped disordered gain medium 103 and the one-way lens 102, and 95% of the radial polarized laser returns along a light path at the coupling mirror 105 to continue resonance.
The spot shape of the output laser light is shown in a diagram in fig. 5, the gray shaded area shows the spot distribution, the black arrow shows the polarization direction of the light at the position, and b diagram in fig. 5 shows the cross-sectional intensity distribution of the light.
EXAMPLE III
Based on the structure of the first embodiment, the fundamental-order radial polarization laser multiplexing method for large-capacity spatial communication is as follows:
(1) the signal encoder 1 converts information to be transmitted into corresponding electric signals and transmits the electric signals to the signal modulation module;
(2) the carrier signal transmitting module 2 generates radial polarization laser as a carrier signal;
(3) according to the electrical signal generated by the signal encoder 1, the first modulatable laser 31, the second modulatable laser 32, the third modulatable laser 33, the fourth modulatable laser 34, the fifth modulatable laser 35 and the sixth modulatable laser 36 control the output of laser light after receiving corresponding control instructions, when the modulatable lasers are in an on state, the output laser light is polarized by corresponding to the first polarizer 41, the second polarizer 42, the third polarizer 43, the fourth polarizer 44, the fifth polarizer 45 and the sixth polarizer 46 respectively, the laser light in a selected polarization state is transmitted to corresponding to the first reflector 61, the second reflector 52, the third reflector 53, the fourth reflector 54, the fifth reflector 55 and the sixth reflector 56 by corresponding to the first reflector 62, the third reflector 63 and the fourth reflector 64, fifth mirror 65, sixth mirror 66, coupled into the carrier signal; the modulatable laser in the off state does not emit laser, namely, the laser which is not subjected to polarization selection is coupled into a carrier signal;
(4) the modulated carrier signal is sent to a narrow band-pass filter 10, the narrow band-pass filter 10 filters optical noise, the filtered signal light is sent to a first spectrometer 71, the first spectrometer 71 sends the signal light to a second spectrometer 72 and a third spectrometer 73 respectively under the condition of equal proportion and no change of polarization state, the third spectrometer 73 divides the input laser into two beams according to the proportion of 70 to 30, the light corresponding to 70 is sent to a fourth spectrometer 74, the fourth spectrometer 74 divides the input laser into two beams according to equal proportion and then is respectively sent out, the second spectrometer 72 divides the input laser into two beams according to the proportion of 70 to 30, the light corresponding to 70 is sent to a fifth spectrometer 75, and the fifth spectrometer 75 divides the incident laser into two beams according to equal proportion;
(5) after the second spectrometer 72 splits the beam, one path of the split laser passes through the seventh polarizer 411, and after the laser taking the radial polarization laser as a carrier signal passes through the seventh polarizer 411, only the polarization direction is kept as an amplitude component which is the same as the vertical direction, and the laser intensity of the corresponding component is measured by the first detector 81; the fifth spectrometer 75 emits laser light, one of the laser light enters the eighth polarizing plate 421, only an amplitude component which is deflected by 30 degrees from the vertical direction is reserved through the eighth polarizing plate 421, the intensity of the corresponding component laser light is measured by the second detector 82, the other laser light enters the ninth polarizing plate 431, only an amplitude component which is deflected by 60 degrees from the vertical direction is reserved, and the intensity of the corresponding component laser light is measured by the third detector 83; the third spectrometer 73 splits the incident laser beam, wherein one beam of laser beam is incident to the tenth polarizer 441, only the amplitude component deflected by 90 degrees from the vertical direction is retained, and the intensity of the corresponding component laser beam is measured by the fourth detector 84; the fourth spectrometer 74 splits the incident laser light, wherein one path of the incident laser light enters the eleventh polarizer 451, only the amplitude component deflected by 120 degrees in the vertical direction is reserved through the eleventh polarizer 451, the laser intensity of the corresponding component is measured by the fifth detector 85, the other path of the incident laser light enters the twelfth polarizer 461, only the amplitude component deflected by 150 degrees in the vertical direction is reserved, and the laser intensity of the corresponding component is measured by the sixth detector 83;
(6) the first detector 81, the second detector 82, the third detector 83, the fourth detector 84, the fifth detector 85 and the sixth detector 86 send the measured laser intensity information of the corresponding component to the signal decoder, and the signal decoder judges the information represented by the corresponding amplitude component according to whether the intensity of each amplitude component is greater than a certain value, so as to complete decoding;
(7) after the signal is decoded, the signal is compiled into an original signal according to binary information, and space laser communication is completed.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A basic-order radial polarization laser multiplexing device for large-capacity space communication is characterized in that the device related to the multiplexing technology comprises a signal encoder (1), a signal modulation module, a carrier signal transmitting module (2), a signal receiving module, a signal demodulation module and a signal decoder (9);
the signal encoder converts information to be transmitted into an electric signal and transmits the electric signal to the signal modulation module, the carrier signal emission module emits radial polarized laser with middle infrared wavelength as a carrier signal, the signal modulation module sends linear polarized laser with different polarization angles according to a control signal and sends the linear polarized laser to the carrier signal, the signal receiving end receives the modulated carrier signal and sends the modulated carrier signal to the signal demodulator, and the signal demodulator demodulates the signal, converts the signal into the electric signal and sends the electric signal to the signal decoder to complete space communication;
the signal modulation module comprises a first modulatable laser (31), a second modulatable laser (32), a third modulatable laser (33), a fourth modulatable laser (34), a fifth modulatable laser (35), a sixth modulatable laser (36), a first polarizing film (41), a second polarizing film (42), a third polarizing film (43), a fourth polarizing film (44), a fifth polarizing film (45), a sixth polarizing film (46), a first total reflection mirror (51), a second total reflection mirror (52), a third total reflection mirror (53), a fourth total reflection mirror (54), a fifth total reflection mirror (55), a sixth total reflection mirror (56), a first reflecting mirror (61), a second reflecting mirror (62), a third reflecting mirror (63), a fourth reflecting mirror (64), a fifth reflecting mirror (65) and a sixth reflecting mirror (66); the first polarizer (41), the second polarizer (42), the third polarizer (43), the fourth polarizer (44), the fifth polarizer (45), and the sixth polarizer (46) are arranged in an array and are respectively arranged in the light emitting directions of the sixth tunable laser (36), the fifth tunable laser (35), the fourth tunable laser (34), the third tunable laser (33), the second tunable laser (32), and the first tunable laser (31); the first total reflection mirror (51) is arranged at the polarized light output end of the first polarizer (41), the second total reflection mirror (52) is arranged at the polarized light output end of the second polarizer (42), the light ray input end of the third total reflection mirror (53) is arranged at the polarized light output end of the third polarizer (43), the fourth total reflection mirror (54) is arranged at the polarized light output end of the fourth polarizer (44), the fifth total reflection mirror (55) is arranged at the polarized light output end of the fifth polarizer (45), and the sixth total reflection mirror (56) is arranged at the polarized light output end of the sixth polarizer (46);
the signal receiving module comprises a narrow band-pass filter (10), a first spectrometer (71), a second spectrometer (72), a third spectrometer (73), a fourth spectrometer (74) and a fifth spectrometer (75);
the signal demodulation module comprises a seventh polaroid (411), an eighth polaroid (421), a ninth polaroid (431), a tenth polaroid (441), an eleventh polaroid (451), a twelfth polaroid (461), a first detector (81), a second detector (82), a third detector (83), a fourth detector (84), a fifth detector (85) and a sixth detector (86);
wherein, the first polaroid (41), the polarization direction coincides with vertical direction; a second polarizing plate (42) having an included angle of 30 degrees between the polarizing direction and the vertical direction; a third polarizing plate (43) having an included angle of 60 degrees between the polarizing direction and the vertical direction; a fourth polarizing plate (44) having an included angle of 90 degrees between the polarizing direction and the vertical direction; a fifth polarizing film (45), wherein the polarizing direction and the vertical direction form an included angle of 120 degrees; a sixth polarizing plate (46) having an included angle of 150 degrees between the polarizing direction and the vertical direction; a seventh polarizing plate (411) whose polarizing direction coincides with the vertical direction;
an eighth polarizer (421) having an angle of 30 degrees between the polarization direction and the vertical direction; a ninth polarizer (431), wherein the polarizing direction and the vertical direction form an included angle of 60 degrees; a tenth polarizing plate (441), wherein the polarizing direction and the vertical direction form an included angle of 90 degrees; an eleventh polarizing plate (451) having an angle of 120 degrees between the polarizing direction and the vertical direction;
a twelfth polarizer (461), a linear polarizer with a diameter of 12.5 mm and a working wavelength of 1500-;
the specific method for multiplexing the fundamental-order radial polarization laser comprises the following steps:
(1) the signal encoder (1) converts information to be sent into corresponding electric signals and sends the electric signals to the signal modulation module;
(2) the carrier signal transmitting module (2) generates radial polarization laser as a carrier signal;
(3) according to an electric signal generated by the signal encoder (1), the first modulatable laser (31), the second modulatable laser (32), the third modulatable laser (33), the fourth modulatable laser (34), the fifth modulatable laser (35), the sixth modulatable laser (36) controls the output of laser after receiving a corresponding control instruction, when the modulatable lasers are in an open state, the output laser is polarized by a first polarizer (41), a second polarizer (42), a third polarizer (43), a fourth polarizer (44), a fifth polarizer (45) and a sixth polarizer (46) respectively, and the polarized laser is transmitted to a corresponding first reflector (61) by a corresponding first total reflection mirror (51), a second total reflection mirror (52), a third total reflection mirror (53), a fourth total reflection mirror (54), a fifth total reflection mirror (55) and a sixth total reflection mirror (56), a second mirror (62), a third mirror (63), a fourth mirror (64), a fifth mirror (65), a sixth mirror (66) coupled into the carrier signal; the modulatable laser in the off state does not emit laser, namely, the laser which is not subjected to polarization selection is coupled into a carrier signal;
(4) the modulated carrier signal is sent to a narrow band-pass filter (10), the narrow band-pass filter (10) filters optical noise, the filtered signal light is sent to a first spectrometer (71), the first spectrometer (71) sends the signal light to a second spectrometer (72) and a third spectrometer (73) respectively under the condition that the signal light is in equal proportion and the polarization state is not changed, the third spectrometer (73) divides the input laser into two beams according to the proportion of 70: 30, the light corresponding to 70 proportion is sent to a fourth spectrometer (74), the fourth spectrometer (74) divides the input laser into two beams according to equal proportion and respectively emits the two beams, the second spectrometer (72) divides the input laser into two beams according to the proportion of 70: 30, the light corresponding to 70 proportion is sent to a fifth spectrometer (75), and the fifth spectrometer (75) divides the incident laser into equal proportion and emits the two beams;
(5) after the second spectrometer (72) is split, one path of split laser passes through a seventh polarizing film (411), the laser taking radial polarized laser as a carrier signal passes through the seventh polarizing film (411), only the polarization direction is reserved as an amplitude component which is the same as the vertical direction, and the laser intensity of a corresponding component is measured by a first detector (81); the fifth spectrometer (75) emits laser, wherein one path of laser enters an eighth polaroid (421), only an amplitude component deflected by 30 degrees in the vertical direction is reserved through the eighth polaroid (421), the laser intensity of a corresponding component is measured by a second detector (82), the other path of laser enters a ninth polaroid (431), only an amplitude component deflected by 60 degrees in the vertical direction is reserved, and the laser intensity of the corresponding component is measured by a third detector (83); the third spectrometer (73) splits the incident laser, wherein one laser beam is incident to the tenth polarizer (441), only the amplitude component which is deflected by 90 degrees from the vertical direction is reserved, and the intensity of the corresponding component laser beam is measured by the fourth detector (84); the fourth spectrometer (74) splits the incident laser light, wherein one path of the incident laser light enters an eleventh polaroid (451), only an amplitude component deflected by 120 degrees in the vertical direction is reserved through the eleventh polaroid (451), the laser intensity of a corresponding component is measured by a fifth detector (85), the other path of the incident laser light enters a twelfth polaroid (461), only an amplitude component deflected by 150 degrees in the vertical direction is reserved, and the laser intensity of the corresponding component is measured by a sixth detector (86);
(6) the first detector (81), the second detector (82), the third detector (83), the fourth detector (84), the fifth detector (85) and the sixth detector (86) send the measured laser intensity information of the corresponding components to the signal decoder (9), and the signal decoder (9) judges the information represented by the corresponding amplitude components according to whether the intensity of each amplitude component is greater than a certain value or not, so as to finish decoding;
(7) after the signal is decoded, the signal is compiled into an original signal according to binary information, and space laser communication is completed.
2. The fundamental-order radial polarization laser multiplexing device for high-capacity spatial communication according to claim 1, wherein the carrier signal emitting module is a radial polarization light generating device, the radial polarization light generating device comprises a single-mode fiber laser, a one-way lens, a thulium-doped disordered gain medium, a single-side gold-plated reflective W-shaped axicon and an output coupling mirror, and the thulium-doped disordered gain medium is a Tm: CYA or Tm: CGA crystal.
3. The fundamental-order radial polarization laser multiplexing equipment for large-capacity space communication according to claim 2, wherein the laser output by the carrier signal transmitting module is fundamental-order radial polarization laser which is mid-infrared laser, the wavelength is 1 micron to 14 microns, the maximum output power is 5 watts, the beam quality factor is greater than 2 and less than 2.3, and the light spot is an annular light spot.
4. The fundamental radial polarization laser multiplexing device for high capacity spatial communication according to claim 1, wherein the first modulatable laser, the second modulatable laser, the third modulatable laser, the fourth modulatable laser, the fifth modulatable laser, and the sixth modulatable laser are high performance current directly modulated lasers, the output laser wavelength is consistent with the wavelength of the carrier signal, the laser phase is consistent with the carrier signal, the maximum output power is 1W, the radio frequency signal control is supported, and the control rate is 10Gbps at most.
5. The fundamental order radial polarization laser multiplexing device for high-capacity spatial communication according to claim 1, wherein the first polarizer, the second polarizer, the third polarizer, the fourth polarizer, the fifth polarizer, the sixth polarizer, the seventh polarizer, the eighth polarizer, the ninth polarizer, the tenth polarizer, the eleventh polarizer and the twelfth polarizer are linear polarizers with a diameter of 12.5 mm, and amplitude components in corresponding polarization directions are retained according to rotation directions.
6. The fundamental radial polarization laser multiplexing device for high capacity spatial communication of claim 1, wherein the first mirror, the second mirror, the third mirror, the fourth mirror, the fifth mirror and the sixth mirror are coated with an anti-reflection film on the side of the incoming carrier signal and an emission film on the side of the incoming modulation signal.
7. The fundamental radial polarization laser multiplexing device for high capacity spatial communication of claim 1, wherein the narrow band-pass filter is polarization independent and has an operating wavelength coincident with an emission wavelength.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6477189B1 (en) * | 1999-07-15 | 2002-11-05 | Kabushiki Kaisha Topcon | Laser oscillation frequency stabilizer |
| CN103236629A (en) * | 2013-04-24 | 2013-08-07 | 广东汉唐量子光电科技有限公司 | Polarization-stable optical fiber laser cascade amplifier |
| CN207019624U (en) * | 2017-05-26 | 2018-02-16 | 浙江大学 | A kind of dual wavelength superhet interferes real-time displacement measuring system |
| CN108574533A (en) * | 2018-03-09 | 2018-09-25 | 长春理工大学 | A kind of Shared aperture laser communication optical transmitter and receiver based on optical phased array |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002084342A1 (en) * | 2001-04-13 | 2002-10-24 | Corning Incorporated | Optical system having extremely low polarization dependent loss and polarization mode dispersion |
| CN102427386B (en) * | 2011-09-19 | 2015-05-27 | 武汉邮电科学研究院 | Polarization shift keying demodulation method and system |
| CN103281149B (en) * | 2013-05-31 | 2016-01-13 | 中国科学院长春光学精密机械与物理研究所 | Circular polarization laser carrier multi-channel communication system |
| JP2016142552A (en) * | 2015-01-30 | 2016-08-08 | Dmg森精機株式会社 | Displacement detection device |
| EP3106828B1 (en) * | 2015-06-16 | 2023-06-07 | Academisch Medisch Centrum | Common-path integrated low coherence interferometry system and method therefor |
-
2020
- 2020-12-25 CN CN202011561181.7A patent/CN112737693B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6477189B1 (en) * | 1999-07-15 | 2002-11-05 | Kabushiki Kaisha Topcon | Laser oscillation frequency stabilizer |
| CN103236629A (en) * | 2013-04-24 | 2013-08-07 | 广东汉唐量子光电科技有限公司 | Polarization-stable optical fiber laser cascade amplifier |
| CN207019624U (en) * | 2017-05-26 | 2018-02-16 | 浙江大学 | A kind of dual wavelength superhet interferes real-time displacement measuring system |
| CN108574533A (en) * | 2018-03-09 | 2018-09-25 | 长春理工大学 | A kind of Shared aperture laser communication optical transmitter and receiver based on optical phased array |
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