CN112910560B - Laser communication method and communication system combining OPA and optical phased array - Google Patents
Laser communication method and communication system combining OPA and optical phased array Download PDFInfo
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- CN112910560B CN112910560B CN202110031655.5A CN202110031655A CN112910560B CN 112910560 B CN112910560 B CN 112910560B CN 202110031655 A CN202110031655 A CN 202110031655A CN 112910560 B CN112910560 B CN 112910560B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
Abstract
The invention discloses a laser communication method and a communication system combining OPA and an optical phased array, wherein the system comprises: the system comprises a signal transmitting end and a signal receiving end, wherein a free space transmission channel is connected between the signal transmitting end and the signal receiving end; the first optical phased array and the second optical phased array are respectively arranged at two ends of the free space transmission channel. The invention enables the wavelength of the laser to be amplified when the laser enters the communication channel by respectively arranging the OPAs at the laser transmitting end and the laser receiving end, and simultaneously adopts the optical phased array constructed by the optical phased array to divide the transmitted laser beam into two beams of light to scan and capture the two beams of light simultaneously in the communication channel, thereby enhancing the diffraction capability of the light wave in the transmission process, simultaneously increasing the transmission distance and the scanning efficiency, and shortening the capturing time on the basis of not sacrificing the transmitting power of the laser.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of laser communication, in particular to a laser communication method and a communication system combining an OPA and an optical phased array.
[ background of the invention ]
Laser communication is a wireless communication mode which uses laser as a carrier to realize information transmission, and data, images, sound and the like in the communication process are transmitted mainly by using a line-of-sight transmission technology of electro-optic and opto-electro conversion. The laser communication system mainly comprises a laser transmitting module, a signal receiving module and a free space channel between the laser transmitting module and the signal receiving module, in the traditional laser communication, only one communication wavelength is used in the transmission process of an optical signal between a transmitting end and a receiving end, and the common working wavelength has weak channel attenuation resistance, so that how to improve the transmission efficiency of the working wavelength in the communication channel and improve the channel attenuation resistance and the transmission distance become one of the problems to be solved in the field of laser communication.
[ summary of the invention ]
The invention aims to provide a laser communication method and a communication system combining an OPA and an optical phased array, wherein the OPA is respectively arranged at a laser transmitting end and a laser receiving end, so that the wavelength is amplified when laser enters a communication channel from the signal transmitting end, and then the short-wave laser is recovered when the laser is transmitted to the signal receiving end from the channel, meanwhile, the optical phased array constructed by the optical phased array is adopted in the communication channel to split a beam of light into two beams of light for scanning and capturing, the diffraction capability of the light wave in the transmission process is enhanced, the transmission distance and the scanning efficiency are increased, and the capturing time is shortened on the basis of not sacrificing the transmitting power of a laser.
In order to achieve the above object, a first aspect of the present invention provides a laser communication method combining an OPA and an optical phased array, including the following steps:
after the laser beam is emitted by the laser of the signal emitting end, modulating the light wave of the laser beam by the photoelectric modulator, and loading the information to be transmitted onto a laser carrier;
the modulated laser beam is subjected to optical wave conversion by using OPA, and the short-wave laser emitted by the laser is converted into long-wave laser;
compressing the divergence angle of the emitted laser beam through an optical beam expander to ensure that the transmission distance of the emitted laser beam is not less than the distance from the signal emitting end to the signal receiving end;
the emitted laser beam is divided into two split beams by an optical phased array to be scanned and captured simultaneously;
and the signal receiving end recovers the long-wave laser into the short-wave laser after receiving the long-wave laser, respectively obtains signal light communication information through the signal light receiving module, and obtains signal light through the beacon light receiving module.
Preferably, the first and second liquid crystal materials are,
in the process that the emission laser beam is divided into two split beams through the optical phased array to be scanned and captured simultaneously, when at least one split beam irradiates a detector of a signal receiving end, aiming of the signal emitting end and the signal receiving end is achieved, and meanwhile the signal receiving end returns an emission laser beam to the signal emitting end.
Preferably, the first and second liquid crystal materials are,
and after the signal light receiving module receives the signal light, the signal light demodulation receiving circuit reads the communication information in the signal light.
Preferably, the first and second liquid crystal materials are,
after receiving the beacon light, the beacon light receiving module reads the light beam pointing information of the beacon light through the beacon light processing circuit and feeds the information back to the optical phased array.
In a second aspect, the present invention provides a laser communication system combining an OPA and an optical phased array, including: the system comprises a signal transmitting end and a signal receiving end, wherein a free space transmission channel is connected between the signal transmitting end and the signal receiving end;
the signal transmitting end is sequentially provided with a laser, a photoelectric modulator, a transmitting end OPA, an optical beam expander and a first optical phased array along the light source transmitting direction;
the signal receiving end is sequentially provided with a second optical phased array, an optical beam reducer, a receiving end OPA, a signal light receiving module and a beacon light receiving module along the laser incidence direction;
the first optical phased array and the second optical phased array are respectively arranged at two ends of the free space transmission channel.
Preferably, the first and second liquid crystal materials are,
the transmitting end OPA is used for realizing light wave conversion, converting short-wave laser emitted by the laser into long-wave laser and then entering the optical beam expander;
and the receiving end OPA is used for recovering the long-wave laser transmitted by the optical beam reducer to the original short-wave laser and then transmitting the short-wave laser to the signal light receiving module and the beacon light receiving module.
Preferably, the first and second liquid crystal materials are,
the signal light receiving module and the beacon light receiving module are simultaneously connected with the receiving end OPA,
the signal light receiving module includes: the signal light detector is used for receiving the signal light recovered to the short-wave laser through the receiving end OPA, and the signal demodulation receiving circuit is used for reading communication information in the signal light;
the beacon light receiving module includes: the beacon light detector is used for receiving beacon light recovered to the short-wave laser through the receiving end OPA; and the beacon light processing circuit is used for reading the beam pointing information of the beacon light and feeding back the information to the first optical phased array and the second optical phased array in sequence.
Preferably, the first and second liquid crystal materials are,
the first optical phased array and the second optical phased array both adopt the optical phased array to enable a laser beam emitted by the laser to be divided into two split beams, wherein the first split beam is transmitted along the incident direction of emitted laser, the included angle between the transmission direction of the second split beam and the transmission direction of the first split beam is smaller than 90 degrees, and the second split beam rotates around the optical axis of the optical phased array.
It is preferable that
And in the two split beams, the first split beam propagates waves along the incident direction of the emitted laser, the split beam covers a central area with the highest occurrence probability density of a receiving terminal, an included angle between the propagation direction of the second split beam and the propagation direction of the first split beam is less than 90 degrees, the second split beam rotates around an optical axis, and annular scanning is performed on an uncertain area around the central area.
Preferably, the first and second liquid crystal materials are,
the optical phased array includes calcite crystals.
The invention has the advantages that:
the invention respectively arranges the OPAs at the laser transmitting end and the laser receiving end, on the basis of ensuring the confidentiality and the high efficiency of the short-wave laser in the transmitted information, the wavelength is amplified when the laser enters a communication channel, the deviation caused by the interference of various particles in the atmosphere in the process of transmitting the long-distance beacon light or the signal light is prevented, the long wave is recovered to the short-wave laser at the signal receiving end for modulation, the wavelength of the laser is increased from the light source end, and the beam is received at the receiving end, so that the better anti-interference performance is obtained.
The invention adopts the optical phased array constructed by the optical phased array to split a beam of light into two beams of light to scan and capture simultaneously in the communication channel, thereby improving the scanning efficiency and shortening the capturing time on the basis of not sacrificing the transmitting power of the laser.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions related to the embodiments are briefly described below with reference to the accompanying drawings, and it is apparent that the drawings described in the present specification are only some possible embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings identical or similar to the technical solutions of the present invention based on the following drawings without any inventive work.
FIG. 1 is a block diagram of a signal transmitting end of a laser communication system combining an OPA and an optical phased array according to the present invention;
FIG. 2 is a block diagram of a signal receiving end of a laser communication system combining an OPA and an optical phased array according to the present invention;
FIG. 3 is a schematic diagram of split beam scanning in a laser communication method combining OPA and optical phased array according to the present invention.
[ detailed description ] embodiments
The technical solutions described in the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments, and it is obvious that the embodiments described in this specification are only a part of possible technical solutions of the present invention, and other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention should be considered as falling within the protection scope of the present invention.
Technical solutions between the embodiments of the present invention described in the present specification may be combined with each other, but it is necessary for those skilled in the art to realize the technical solutions.
Opa (optical Parametric amplification) optical Parametric amplification is an operation of increasing light intensity of a specific frequency by using a nonlinear optical effect, and a device equipped with this mechanism is called an optical Parametric amplifier. The invention utilizes OPA to carry out wavelength conversion on the laser light wave, thereby not only ensuring the confidentiality and the high efficiency of the transmission information of the short-wave laser in the laser communication, but also ensuring the farther transmission distance of the communication wave in a free space transmission channel through the anti-attenuation capacity of the channel of the communication wavelength through the wavelength conversion.
Optical axis of crystal: birefringence does not occur when light propagates within the crystal in a particular direction, referred to as the optical axis of the crystal.
The laser communication method and the communication system combining the OPA and the optical phased array can be applied to the establishment of an aerospace integrated network, and the laser communication is used as a key composition technology and needs to ensure the requirement of multidirectional environmental communication. In the part for establishing an information path by utilizing optical phased array capture, the requirements of high-efficiency capture between quick-moving units and ground over-distance capture of similar satellites are met. The method can also be applied to the field of marine communication, because the marine environment is in a changing state at any time, the requirements on the anti-interference performance of an information channel and the stability of information link are higher, the longer the wavelength is in a communication channel, the stronger the diffraction capability is, and the longer the transmission distance is, however, in laser communication, in order to ensure the confidentiality and the high efficiency of information transmission, the shorter the wavelength of emitted laser is, and the deviation is easily caused by the interference of various particles in the atmosphere in the process of transmitting long-distance beacon light or signal light. The technical scheme of the invention is based on the high-efficiency tracking technology integrating the birefringence principle and the anti-interference technology (OPA) amplifying the laser wavelength, establishes a whole set of phased array tracking optimization scheme most suitable for application scenes, increases the wavelength of the laser from a light source end, and performs beam-closing reply on the optical wavelength at a signal receiving end, thereby ensuring that the laser has better anti-interference performance in the transmission of an information channel and increasing the transmission distance of the information.
Referring to the schematic block diagrams of the laser communication system of the present invention combining the OPA and the optical phased array shown in fig. 1-3, the laser communication method of the present invention combining the OPA and the optical phased array is realized by the system, which comprises the following steps:
after the laser beam is emitted by the laser of the signal emitting end, modulating the light wave of the laser beam by the photoelectric modulator, and loading the information to be transmitted onto a laser carrier;
the modulated laser beam carries out light wave conversion by using an emitting end OPA, short-wave laser emitted by a laser is converted into long-wave laser, and specifically, the laser is converted into 3-5 microns of wavelength from 1.55 microns and then is transmitted in a free space transmission channel;
compressing the divergence angle of the emitted laser beam through an optical beam expander to ensure that the transmission distance of the emitted laser beam is not less than the distance from the signal emitting end to the signal receiving end;
the emitted laser beam is divided into two split beams by an optical phased array to be scanned and captured simultaneously;
and the signal receiving end recovers the long-wave laser into the short-wave laser after receiving the long-wave laser, respectively obtains signal light communication information through the signal light receiving module, and obtains signal light through the beacon light receiving module. Because the sensitivity of the long wave device cannot meet the high sensitivity of communication, a receiving end OPA is arranged at a signal receiving end to convert the long wave into 1.55um short wave laser and then modulate a photoelectric signal.
In a free space transmission channel of laser communication, the longer the wavelength is, the stronger the diffraction capability is, and the longer the transmission distance can be, so that the invention transfers the working wavelength of the laser emitted by a laser to the long wave direction through an emitting end OPA at a signal emitting end, and enhances the channel attenuation resistance of the communication wave in the free space transmission channel, thereby increasing the transmission distance.
In a preferred embodiment, the optical phased array of the present invention employs an optical phased array to generate two refracted lights by a birefringence phenomenon of a birefringent crystal in the optical phased array after a laser beam emitted by a laser passes through the optical phased array, so that in a process of scanning and capturing a beam of emitted laser divided into two split beams simultaneously, when at least one of the split beams irradiates a detector of a signal receiving end, aiming of the signal emitting end and the signal receiving end is achieved, and the signal receiving end returns an emitted laser beam to the signal emitting end.
And after the signal light receiving module receives the signal light, the signal light demodulation receiving circuit reads the communication information in the signal light. After receiving the beacon light, the beacon light receiving module reads the light beam pointing information of the beacon light through the beacon light processing circuit and feeds the information back to the optical phased array.
On the other hand, the technical scheme of the invention includes a laser communication system combining the OPA and the optical phased array, and is used for realizing the laser communication method combining the OPA and the optical phased array, and the laser communication system includes a signal transmitting end (as shown in fig. 1, a schematic block diagram) and a signal receiving end (as shown in fig. 2, a schematic block diagram), and a free space transmission channel is connected between the signal transmitting end and the signal receiving end.
As shown in fig. 1, the signal transmitting end is sequentially arranged with a laser 1, an optoelectronic modulator 2, an transmitting end OPA3, an optical beam expander 4 and a first optical phased array 5 along the light source transmitting direction. Wherein the laser 1 is used for emitting laser light; the photoelectric modulator 2 is used for modulating light waves and loading information to be transmitted onto a laser carrier; the transmitting end OPA3 is used for realizing light wave conversion, converting short-wave laser emitted by the laser into long-wave laser and then entering the optical beam expander; the optical beam expander 4 is used for compressing the beam divergence angle of the emitted laser beam; the first optical phased array 5 is used for realizing the rapid deflection of the laser beam at the signal transmitting end, and the transmitted laser beam is split into two beams to be scanned and captured simultaneously.
As shown in fig. 2, the signal receiving end is sequentially arranged with a second optical phased array 6, an optical beam reducer 7, a receiving end OPA8, a signal light receiving module and a beacon light receiving module along the laser incidence direction; the first optical phased array 5 and the second optical phased array 6 are respectively arranged at two ends of the free space transmission channel. And the receiving end OPA is used for recovering the long-wave laser transmitted by the optical beam reducer to the original short-wave laser and then transmitting the short-wave laser to the signal light receiving module and the beacon light receiving module. The signal light receiving module and the beacon light receiving module are connected to the receiving terminal OPA8 at the same time. The signal light receiving module includes: the signal light detector 9 and the signal demodulation receiving circuit 10, the signal light detector 9 is used for receiving the signal light recovered to the short-wave laser through the receiving end OPA 8; the signal demodulation receiving circuit 10 is configured to read communication information in the signal light. The beacon light receiving module comprises a beacon light detector 11 and a beacon light processing circuit 12, wherein the beacon light detector 11 is used for receiving beacon light recovered to short-wave laser light through the receiving end OPA 8; and a beacon light processing circuit 12 for reading beam pointing information of the beacon light and feeding back the information to the first optical phased array 5 and the second optical phased array 6 in sequence.
Referring to fig. 3, in the scanning and capturing process, the first optical phased array 5 and the second optical phased array 6 both use an optical phased array including a birefringent crystal to cause a laser beam emitted by the laser 1 to generate two refracted light beams through a birefringence phenomenon of the birefringent crystal, so that the emitted laser beam is divided into two split beams, wherein the first split beam propagates along an incident direction of the emitted laser, an included angle between a propagation direction of the second split beam and a propagation direction of the first split beam is smaller than 90 °, and the second split beam rotates around an optical axis of the optical phased array. In a preferred embodiment, the birefringent crystal is made of calcite crystal, after information to be transmitted is loaded by laser light emitted by the laser 1 at the signal emitting end, the divergence angle of the light beam is compressed by the first optical phased array 5, so that the light beam enters the calcite in the first optical phased array 5 more intensively to generate double refraction, and two refracted light rays are generated, wherein one refracted light ray obeys a general refraction law for a normal light ray (o light), the refracted light ray is in an incident plane, and the other refracted light ray does not obey the general refraction law for an extraordinary light ray (e light), and is not in the incident plane. When the incident line of the emitted laser beam entering the first optical phased array 5 is taken as an axis to rotate calcite, the ordinary ray (o light) cannot rotate along with the incident line, the propagation speed of the ordinary ray (o light) in each direction in the crystal is the same, and the extraordinary ray (e light) rotates around the ordinary ray (o light), and the propagation speed of the extraordinary ray (e light) in the crystal changes along with the direction. By adjusting the incident direction of the emission laser beam into the first optical phased array 5, the first split beam obtained by decomposing the emission laser beam passing through the calcite can be made to be the ordinary ray (o light), the second split beam is the extraordinary ray (e light), and the second split beam is spirally propagated around the first split beam as the ordinary ray (o light) by rotating the calcite around the incident line as the axis. In practical application, the second split light beam can be rotated around the optical axis of the optical phased array by applying electrodes in the optical phased array and applying different voltages to the optical phased array through the electrodes. Specifically, when scanning and capturing are carried out, the first split light beam of the two split light beams propagates waves along the incident direction of the emitted laser, the split light beam covers a central area with the highest probability density of the occurrence of a receiving terminal, an included angle between the propagation direction of the second split light beam and the propagation direction of the first split light beam is smaller than 90 degrees, the second split light beam rotates around an optical axis, and annular scanning is carried out on an uncertain area around the central area. By the scanning mode, because the included angle between the propagation direction of the second split light beam and the propagation direction of the first split light beam is kept consistent, the annular scanning of the second split light beam can ensure that the scanning efficiency is higher and the capture time is shorter on the premise of not sacrificing the action distance of a communication link.
The laser ensures the confidentiality and high efficiency of information transmitted by the laser due to the characteristic of short wavelength, but is easily interfered by various particles in the atmosphere to cause deviation in the process of transmitting the remote beacon light or the signal light. The technical scheme of the invention increases the wavelength of the laser from the light source end, thereby obtaining better anti-interference performance, realizing beam-closing at the receiving end and ensuring the confidentiality and high efficiency of the short-wave laser in communication.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of laser communication combining an OPA with an optical phased array, comprising the steps of:
after the laser beam is emitted by the laser of the signal emitting end, modulating the light wave of the laser beam by the photoelectric modulator, and loading the information to be transmitted onto a laser carrier;
the modulated laser beam is subjected to light wave conversion by using an emitting end OPA, short-wave laser emitted by a laser is converted into long-wave laser, and the long-wave laser enters an optical beam expander;
compressing a beam divergence angle of the emitted laser beam through an optical beam expander, so that the transmission distance of the emitted laser beam is not less than the distance from the signal emitting end to the signal receiving end and then the emitted laser beam enters an optical phased array;
the emission laser beam is divided into two split beams through the optical phased array to be scanned and captured simultaneously;
after receiving the long-wave laser, the signal receiving end recovers the long-wave laser into short-wave laser by using the receiving end OPA, signal light communication information is obtained through the signal light receiving module, and beacon light is obtained through the beacon light receiving module.
2. The OPA and optical phased array combined laser communication method as claimed in claim 1, wherein during the process of scanning and capturing the emission laser beam divided into two split beams by the optical phased array, when at least one split beam irradiates a detector of a signal receiving end, the signal emitting end and the signal receiving end are aimed, and the signal receiving end returns an emission laser beam to the signal emitting end.
3. The method of claim 1, wherein the signal light receiving module receives the signal light and reads the communication information in the signal light through a signal light demodulation and reception circuit.
4. The laser communication method of claim 3, wherein the beacon light receiving module receives the beacon light, reads the beam pointing information of the beacon light through the beacon light processing circuit, and feeds the information back to the optical phased array.
5. The laser communication system combining the OPA and the optical phased array is characterized by comprising a signal transmitting end and a signal receiving end, wherein a free space transmission channel is connected between the signal transmitting end and the signal receiving end;
the signal transmitting end is sequentially provided with a laser, a photoelectric modulator, a transmitting end OPA, an optical beam expander and a first optical phased array along the light source transmitting direction; the first optical phased array is used for realizing the rapid deflection of a laser beam at a signal transmitting end, and splitting the transmitted laser beam into two beams for scanning and capturing simultaneously;
the signal receiving end is sequentially provided with a second optical phased array, an optical beam reducer, a receiving end OPA, a signal light receiving module and a beacon light receiving module along the laser incidence direction;
the first optical phased array and the second optical phased array are respectively arranged at two ends of the free space transmission channel.
6. A laser communication system with OPA combined with optical phased array as claimed in claim 5,
the transmitting end OPA is used for realizing light wave conversion, converting short-wave laser emitted by the laser into long-wave laser and then entering the optical beam expander;
and the receiving end OPA is used for recovering the long-wave laser transmitted by the optical beam reducer to the original short-wave laser and then transmitting the short-wave laser to the signal light receiving module and the beacon light receiving module.
7. The OPA and optical phased array combined laser communication system as claimed in claim 6, wherein said signal light receiving module and said beacon light receiving module are connected to said receiving end OPA simultaneously,
the signal light receiving module includes: the signal light detector is used for receiving the signal light recovered to the short-wave laser through the receiving end OPA, and the signal demodulation receiving circuit is used for reading communication information in the signal light;
the beacon light receiving module includes: the beacon light detector is used for receiving beacon light recovered to the short-wave laser through the receiving end OPA; and the beacon light processing circuit is used for reading the beam pointing information of the beacon light and feeding back the information to the first optical phased array and the second optical phased array in sequence.
8. A laser communication system with an OPA combined with an optical phased array according to any of claims 5 to 7, characterized in that the first optical phased array and the second optical phased array each employ the optical phased array to split the laser beam emitted by the laser into two split beams, wherein the first split beam propagates along the incident direction of the emitted laser light, the second split beam propagates at an angle smaller than 90 ° to the propagation direction of the first split beam, and the second split beam rotates around the optical axis of the optical phased array.
9. The OPA and optical phased array combined laser communication system of claim 8, wherein the first split beam of the two split beams propagates along the incident direction of the emission laser, the split beam covers a central region where the probability density of occurrence of the receiving terminal is highest, the propagation direction of the second split beam forms an angle smaller than 90 ° with the propagation direction of the first split beam, and the second split beam rotates around the optical axis to perform a circular scan on the uncertainty region around the central region.
10. A laser communication system with OPA in combination with optical phased array as claimed in claim 8 wherein the optical phased array comprises calcite crystals.
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