CN113965266B - Time-frequency transmission and communication integrated system and method based on femtosecond optical comb - Google Patents
Time-frequency transmission and communication integrated system and method based on femtosecond optical comb Download PDFInfo
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- CN113965266B CN113965266B CN202111133658.6A CN202111133658A CN113965266B CN 113965266 B CN113965266 B CN 113965266B CN 202111133658 A CN202111133658 A CN 202111133658A CN 113965266 B CN113965266 B CN 113965266B
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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
- H04B10/508—Pulse generation, e.g. generation of solitons
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
The application relates to the technical field of inter-satellite time-frequency communication transmission, and provides a time-frequency transmission and communication integrated system and method based on a femtosecond optical comb. The system comprises: a first transmission or reception system configured to transmit or receive signal light and exchange the signal light with the laser module and the optical comb module, wherein the signal light includes laser signal light and first optical comb pulse light; a laser module configured to generate or process the laser signal light and exchange the laser signal light with the transmitting or receiving system, wherein the laser signal light is configured to carry communication information; and a first optical comb module configured to generate or process the first optical comb pulse light and exchange the first optical comb pulse light with the first transmitting or receiving system, wherein the first optical comb pulse light is configured to carry time-frequency information.
Description
Technical Field
The present application relates generally to the field of inter-satellite time-frequency communication transfer technology. In particular, the application relates to a time-frequency transmission and communication integrated system and method based on a femtosecond optical comb.
Background
With the rapid development of optical communication technology, a femtosecond optical frequency comb (femtosecond optical comb) has received a great deal of attention in possible applications in various fields. In 2013, NIST (national institute of standards and technology) adopts a linear optical sampling technology based on a femtosecond optical frequency comb (femtosecond optical comb) to realize the 1fs time comparison precision of 2km distance and 10 -18 Stability @1000 s. In 2015, NIST improved the experimental scheme, and a time synchronization experiment was performed at a distance of 4km, with a time synchronization accuracy of 4fs@1min,50fs@40h. By 2016, NIST increased the experimental distance to 12km and the stability to 10 -19 @10000s。
The principle of realizing time-frequency transmission in space through the femtosecond optical comb is to lock the clock information of two places to the comb tooth frequency of the local femtosecond optical comb and transmit the clock information to the other party through a link similar to laser communication. Because of the small difference of the repetition frequencies of the optical comb pulses of the two local femtosecond optical combs, the method can be considered as 'sampling' and interference of the received remote optical comb pulses by the local optical comb pulses, so that ultra-high-precision time measurement precision can be obtained, and clock differences of two places can be obtained by comparing the laws of interference signals of the local femtosecond optical combs and the received femtosecond optical combs. Therefore, the accuracy of space time-frequency transmission can be effectively improved through the femtosecond optical comb, however, the time-frequency transmission based on the femtosecond optical comb in the prior art is still in a test stage, and the study of the integration of laser communication and optical comb time-frequency transmission is still in blank.
Disclosure of Invention
To at least partially solve the above-mentioned problems in the prior art, the present application proposes a time-frequency transmission and communication integrated system based on a femtosecond optical comb, comprising:
a first transmission or reception system configured to transmit or receive signal light and exchange the signal light with the laser module and the optical comb module, wherein the signal light includes laser signal light and first optical comb pulse light;
a laser module configured to generate or process the laser signal light and exchange the laser signal light with the transmitting or receiving system, wherein the laser signal light is configured to carry communication information; and
a first optical comb module configured to generate or process the first optical comb pulse light and exchange the first optical comb pulse light with the first transmitting or receiving system, wherein the first optical comb pulse light is configured to carry time-frequency information.
In one embodiment of the application, it is provided that the time-frequency transfer and communication integrated system based on a femtosecond optical comb further comprises a beacon light module, and the signal light further comprises a beacon light configured to generate or process the beacon light and exchange the beacon light with the transmitting or receiving system.
In one embodiment of the application, it is provided that the first transmitting or receiving system comprises:
an optical antenna configured to transmit or receive beacon light, laser signal light, and first optical comb pulse light;
a transceiver separator configured to combine or separate a transmission light path or a reception light path of the beacon light, the laser signal light, and the optical comb pulse light;
a turntable on which the optical antenna is arranged, wherein adjustment within a coarse tracking accuracy range of the visual axis direction of the optical antenna is performed by rotation of the turntable; and
a fast mirror configured to make an adjustment within a fine tracking accuracy range of the boresight pointing of the optical antenna, wherein the fine tracking accuracy range is less than the coarse tracking accuracy range.
The application also provides a method for time-frequency transmission and communication by using the time-frequency transmission and communication integrated system based on the femtosecond optical comb, wherein the time-frequency transmission and communication are carried out by a first system and a second system, and the method comprises the following steps:
receiving, by a first transmitting or receiving system of a first said system, beacon light emitted by a second said system;
acquiring, by a beacon light module of a first said system, an alignment error of a visual axis pointing between optical antennas of the first and second said systems from said beacon light, and correcting said visual axis pointing by a two-dimensional servo turret and/or a fast mirror of the first said system to establish an inter-satellite link between the first and second said systems;
receiving laser signal light emitted by a second system and first optical comb pulse light by a first emitting or receiving system of the first system;
generating and emitting laser signal light by a laser module of a first said system and processing the laser signal light emitted by a second said system for communication between the first and second said systems; and
the optical comb pulse light is generated and emitted by an optical comb module of a first said system and the first optical comb pulse light emitted by a second said system is processed for time-frequency transfer between the first and second said systems.
In one embodiment of the application, another time-frequency transmission and communication integrated system based on the femtosecond optical comb is also provided, which comprises:
a second transmitting or receiving system configured to transmit or receive a second optical comb pulse light; and
a second optical comb module configured to generate or process second optical comb pulse light and exchange the second optical comb pulse light with the second transmitting or receiving system, wherein the second optical comb pulse light is configured to carry time-frequency information or to carry communication information by modulating amplitude.
In one embodiment of the application, it is provided that the second optical comb module comprises:
a first coupler configured to split and transmit the second comb pulse light to a balance detector and a photodetector;
a first balance detector configured to detect and process time-frequency information of the second optical comb pulse light; and
and a first photodetector configured to detect the amplitude of the second optical comb pulse light, and determine whether the second optical comb pulse light carries communication information according to the amplitude, discard time-frequency information if the communication information is carried, and process the communication information.
In one embodiment of the present application, a method for performing time-frequency transmission and communication by using the time-frequency transmission and communication integrated system based on the femtosecond optical comb is further provided, wherein the third system and the fourth system perform time-frequency transmission and communication, and the method comprises the following steps:
generating second optical comb pulse light carrying time-frequency information or communication information in a time-sharing way by a second optical comb module of the third system;
transmitting, by a third of said systems, said second comb pulse light to a fourth of said systems;
splitting and transmitting the second comb pulse light by a first coupler of a fourth said system to a first balance detector and a first photodetector of the fourth said system;
detecting and processing time-frequency information of the second optical comb pulse light by a first balance detector of the fourth system; and
detecting the amplitude of the second optical comb pulse light by the first photoelectric detector of the fourth system, determining whether the second optical comb pulse light carries communication information or not according to the amplitude, discarding time-frequency information if the second optical comb pulse light carries the communication information, and processing the communication information.
In one embodiment of the present application, another time-frequency transmission and communication integrated system based on a femtosecond optical comb is further provided, which is characterized by comprising:
a third transmitting or receiving system configured to transmit or receive a third optical comb pulse light; and
a third optical comb module configured to generate or process third optical comb pulse light and exchange the third optical comb pulse light with the third transmitting or receiving system, wherein the third optical comb pulse light is configured to carry time-frequency information and carry communication information by modulating amplitude.
In one embodiment of the application, it is provided that the third optical comb module comprises:
a second coupler configured to split and transmit the third comb pulse light to a balance detector and a photodetector;
a second balance detector configured to detect and process time-frequency information of the third optical comb pulse light; and
a second photodetector configured to detect and process communication information of the third optical comb pulse light.
In one embodiment of the present application, a method for performing time-frequency transmission and communication by using the time-frequency transmission and communication integrated system based on the femtosecond optical comb is further provided, wherein the fifth system and the sixth system perform time-frequency transmission and communication, and the method comprises the following steps:
generating third optical comb pulse light by a third optical comb module of the fifth system;
transmitting, by a fifth said system, said third comb pulse light to a sixth said system;
splitting and transmitting the third comb pulse light by a second coupler of a sixth said system to a second balanced detector and a second photodetector of the sixth said system;
detecting and processing time-frequency information of the third optical comb pulse light by a second balance detector of the sixth system; and
and detecting and processing the communication information of the third optical comb pulse light by a second photoelectric detector of the sixth system.
The present application is based on the following insight of the inventors: optical comb time frequency delivery as a free space optical delivery has many commonalities with free space laser communication, for example, it also requires optical transmitters and receivers, and it also requires the acquisition, tracking and alignment of the target terminals to be accomplished, establishing a stable laser link. In view of the above, the application provides an integrated scheme of laser communication and optical comb time-frequency transmission, which comprises laser communication and optical comb structure multiplexing integration, laser communication and optical comb time-division multiplexing integration and laser communication and optical comb amplitude modulation integration.
The application has at least the following beneficial effects: through the technical scheme of creative integrated design of laser communication and optical comb time-frequency transmission, the on-board load can be effectively reduced, and on-board resource expenditure in the satellite communication and time-frequency transmission process can be effectively reduced.
Drawings
To further clarify the advantages and features present in various embodiments of the present application, a more particular description of various embodiments of the present application will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the application and are therefore not to be considered limiting of its scope. In the drawings, for clarity, the same or corresponding parts will be designated by the same or similar reference numerals.
Fig. 1 and 2 respectively show schematic diagrams of a time-frequency transmission and communication integrated system based on a femtosecond optical comb in one embodiment of the application.
Fig. 3 is a schematic diagram of optical comb pulse light for time-division transmitting time-frequency information and communication information according to an embodiment of the present application.
Fig. 4 is a schematic diagram of optical comb pulse light for simultaneously transmitting time-frequency information and communication information in one embodiment of the present application.
Detailed Description
It should be noted that the components in the figures may be shown exaggerated for illustrative purposes and are not necessarily to scale. In the drawings, identical or functionally identical components are provided with the same reference numerals.
In the present application, unless specifically indicated otherwise, "disposed on …", "disposed over …" and "disposed over …" do not preclude the presence of an intermediate therebetween. Furthermore, "disposed on or above" … merely indicates the relative positional relationship between the two components, but may also be converted to "disposed under or below" …, and vice versa, under certain circumstances, such as after reversing the product direction.
In the present application, the embodiments are merely intended to illustrate the scheme of the present application, and should not be construed as limiting.
In the present application, the adjectives "a" and "an" do not exclude a scenario of a plurality of elements, unless specifically indicated.
It should also be noted herein that in embodiments of the present application, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that the components or assemblies may be added as needed for a particular scenario under the teachings of the present application. In addition, features of different embodiments of the application may be combined with each other, unless otherwise specified. For example, a feature of the second embodiment may be substituted for a corresponding feature of the first embodiment, or may have the same or similar function, and the resulting embodiment may fall within the scope of disclosure or description of the application.
It should also be noted herein that, within the scope of the present application, the terms "identical", "equal" and the like do not mean that the two values are absolutely equal, but rather allow for some reasonable error, that is, the terms also encompass "substantially identical", "substantially equal". By analogy, in the present application, the term "perpendicular", "parallel" and the like in the table direction also covers the meaning of "substantially perpendicular", "substantially parallel".
The numbers of the steps of the respective methods of the present application are not limited to the order of execution of the steps of the methods. The method steps may be performed in a different order unless otherwise indicated.
The application is further elucidated below in connection with the embodiments with reference to the drawings.
Scheme I, laser communication and optical comb structure integrated scheme
Fig. 1 shows a schematic diagram of a time-frequency transmission and communication integrated system based on a femtosecond optical comb in one embodiment of the application, which can include a transmitting or receiving system, a laser module, an optical comb module, and a beacon optical module. The optical comb module is added on the basis of the traditional laser communication system, and the optical comb time-frequency transmission of the optical comb module and the laser communication of the laser module share a transmitting or receiving light path, so that the integration is realized on the system structure.
The transmitting or receiving system can transmit or receive beacon light, laser signal light and optical comb pulse light. The transmitting or receiving system may include an optical antenna, a transceiver splitter, a two-dimensional servo turret, a fast tilting mirror, an advance sighting telescope, and a beacon light detector.
The optical antenna may transmit or receive beacon light, laser communication signal light, and time-frequency transmission optical comb pulse light. The three kinds of light are set at different wavelengths, and the light paths are separated by using dichroic mirrors.
The transceiver splitter can be used for combining the emitting light path of the beacon light, the laser communication signal light and the time-frequency transmission optical comb pulse light and separating the receiving light paths of the beacon light and the laser communication signal light.
The optical antenna can be arranged on the two-dimensional servo turntable, and the adjustment in the coarse tracking precision range of the visual axis direction of the optical antenna can be realized through the control of the two-dimensional servo turntable, wherein the coarse tracking precision range can be less than 50 mu rad.
The fast tilting mirror and the early sighting telescope may be fast reflectors that enable fast adjustment of the visual axis pointing of the optical antenna within a fine tracking accuracy range, which is smaller than the coarse tracking accuracy range, e.g. may be smaller than 5 mu rad. However, it will be appreciated by those skilled in the art that the coarse or fine tracking accuracy ranges described above are merely examples, and that those skilled in the art may select appropriate values based on the actual system.
The beacon light module may generate or process beacon light and exchange the beacon light with the transmitting or receiving system. Herein, the term "exchange" means that the beacon light module transmits the beacon light generated by it to the transmitting or receiving system or the transmitting or receiving system transmits the beacon light received by it from other terminals to the beacon light module.
The beacon light module may include a beacon light generator and a beacon light detector. The beacon light generator may generate beacon light and transmit the beacon light to the transmitting or receiving system, and then transmit the beacon light to other terminals through the transmitting or receiving system. The beacon light detector can detect the beacon light emitted by other terminals received by the emitting or receiving system to obtain the alignment error of the visual axis of the optical antenna, and the visual axis direction of the optical antenna is corrected by rotating the two-dimensional servo turntable, the quick tilting mirror and the advanced sighting telescope, so that the two terminals between the satellites are aligned accurately, and a stable laser link is established.
A laser module may generate or process the laser signal light and exchange the laser signal light with the transmitting or receiving system, wherein the laser signal light is configured to carry communication information. The laser module may include a laser communication master module, an electro-optic modulator, a communication detector, and a demodulator, wherein the communication process may include the steps of: after the stable laser link is established, the laser communication master control module modulates data to be transmitted onto laser signal light by using an electro-optical modulator, amplifies the optical power and finally emits the amplified optical power, and meanwhile, the laser module can receive the laser signal light emitted by the target terminal, converts the optical signal into an electric signal by using a communication detector, and demodulates and decodes the data by using a demodulator to realize communication.
An optical comb module may generate or process the optical comb pulse light and exchange the optical comb pulse light with the transmitting or receiving system, wherein the optical comb pulse light is configured to carry time-frequency information. The optical comb module can transmit the optical comb signals locked on the local terminal time frequency standard through the transmitting or receiving system, receives the optical comb pulse light transmitted from the far end, compares the optical comb pulse light with the local optical comb signals, and calculates the local time difference. The clock difference data of two places are obtained by comparing with the far-end time difference transmitted by laser communication.
In one embodiment of the present application, a method for time-frequency transfer and communication using the system shown in fig. 1 is also presented, wherein the time-frequency transfer and communication is performed by a first said system and a second said system, the method may comprise the steps of:
receiving, by a first transmitting or receiving system of a first said system, beacon light emitted by a second said system;
acquiring, by a beacon light module of a first said system, an alignment error of a visual axis pointing between optical antennas of the first and second said systems from said beacon light, and correcting said visual axis pointing by a two-dimensional servo turret and/or a fast mirror of the first said system to establish an inter-satellite link between the first and second said systems;
receiving laser signal light emitted by a second system and first optical comb pulse light by a first emitting or receiving system of the first system;
generating and emitting laser signal light by a laser module of a first said system and processing the laser signal light emitted by a second said system for communication between the first and second said systems; and
the optical comb pulse light is generated and emitted by an optical comb module of a first said system and the first optical comb pulse light emitted by a second said system is processed for time-frequency transfer between the first and second said systems.
Scheme II, laser communication and optical comb structure time division multiplexing integrated scheme
Fig. 2 shows a schematic diagram of a time-frequency transmission and communication integrated system based on a femtosecond optical comb in another embodiment of the application, the system shown in fig. 2 is based on the system shown in fig. 1, a laser module is removed, and the emission of a time-frequency signal and a communication signal is completed simultaneously by adopting the femtosecond optical comb to realize the greater utilization of resources. And time-sharing communication is adopted, and communication signals are transmitted in a time-sharing manner on the basis of guaranteeing time-frequency correction requirements, wherein the communication information can be modulated on the amplitude of the optical comb pulse light.
As shown in fig. 2, there are optical combs a and B at positions a and B, respectively, with repetition frequencies spaced apart by about several kilohertz. The optical comb a is locked to a local clock, with which optical comb pulse light is emitted, wherein time-division emission of time-frequency signals and communication signals which are amplitude-modulated via an acousto-optic or amplitude modulator. A schematic diagram of the transmitted signal may be as shown in fig. 3. After the signal light A is transmitted through the free space, part of the signal light is mixed with the local light through a first 50/50 coupler at the position B so as to enter a balance detector, and further time-frequency information can be analyzed by using a linear optical sampling method; and the other part of the signal light is split by the coupler to enter the photoelectric detector, the amplitude of the detected light pulse is processed, and the detected electric pulse is used for judging whether the signal light is an amplitude modulation signal. If the received optical comb pulse light starts to touch the low threshold value of the electric pulse from the header signal, the transmitted modulated pulse is indicated at the moment, namely the communication signal is transmitted at the moment, then the electric pulse is further subjected to demodulation processing, and the time-frequency information is discarded at the same time; if the light pulse is an unmodulated signal, the time-frequency signal is transmitted at the moment, and the communication information can be discarded.
In one embodiment of the present application, a method for time-sharing time-frequency transmission and communication by using the system shown in fig. 2 is also provided, wherein the third system and the fourth system perform time-frequency transmission and communication, and the method may include the following steps:
generating second optical comb pulse light carrying time-frequency information or communication information in a time-sharing way by a second optical comb module of the third system;
transmitting, by a third of said systems, said second comb pulse light to a fourth of said systems;
splitting and transmitting the second comb pulse light to a balance detector and a photodetector of a fourth system by a coupler of the fourth system;
detecting and processing time-frequency information of the second optical comb pulse light by a balance detector of the fourth system; and
detecting the amplitude of the second optical comb pulse light by a balance detector of the fourth system, determining whether the second optical comb pulse light carries communication information or not according to the amplitude, discarding time-frequency information if the second optical comb pulse light carries the communication information, and processing the communication information.
Scheme III, laser communication and optical comb amplitude modulation integrated scheme
In the scheme II, a time-sharing transmission scheme is adopted, and time-frequency information and communication information are respectively loaded on femtosecond optical comb pulses in different time periods, so that a receiving end only extracts one type of information at the same time and discards the other type of information, and a certain degree of resource waste still can be caused. In order to further improve the communication efficiency, in one embodiment of the present application, two types of signals are simultaneously loaded on the femtosecond optical comb pulse, and the receiving end may use a limiting filter to obtain the communication and time-frequency information, where a schematic diagram of the optical comb pulse is shown in fig. 4.
In the scheme, the optical comb pulse transmits time-frequency information and simultaneously modulates optical communication information to the amplitude of the pulse. During amplitude modulation, the modulation means for retaining the phase information of the original pulse is adopted as much as possible. The hardware structure of the receiving end is the same as that of the scheme II, and is divided into two parts according to time-frequency information analysis and communication information analysis, and the time-frequency information and the communication information are respectively and simultaneously received.
It is considered that the analysis of the time-frequency information by the linear optical sampling is inevitably affected when amplitude modulation is performed. I.e. linear optical sampling, is limited by the presence of a threshold triggered by the acquisition card, at the lower limit of optical power. And when the optical power is reduced, the calculated phase becomes dispersed, so that the linearity is deteriorated, and the clock difference value is obtained after the linear fitting is affected. Therefore, on the premise that the transmitting end keeps the modulation of the phase information as much as possible, the receiving end can post-process the phase information. And obtaining amplitude modulation conditions by utilizing demodulated optical communication information through the influence relation between the amplitude and the phase calculated in advance, and inverting and compensating the phase changed due to modulation so as to compensate errors brought by the phase.
In one embodiment of the present application, there is also provided a method for simultaneously time-frequency transfer and communication using the system shown in fig. 2, wherein the time-frequency transfer and communication is performed by the fifth and sixth systems, the method comprising the steps of:
generating third optical comb pulse light by a third optical comb module of the fifth system;
transmitting, by a fifth said system, said third comb pulse light to a sixth said system;
splitting and transmitting the third comb pulse light by a second coupler of a sixth said system to a second balanced detector and a second photodetector of the sixth said system;
detecting and processing time-frequency information of the third optical comb pulse light by a second balance detector of the sixth system; and
and detecting and processing the communication information of the third optical comb pulse light by a second photoelectric detector of the sixth system.
While various embodiments of the present application have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications, and variations can be made therein without departing from the spirit and scope of the application. Thus, the breadth and scope of the present application as disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (6)
1. A time-frequency transfer and communication integrated system based on a femtosecond optical comb, comprising:
a first transmission or reception system configured to transmit or receive signal light through an inter-satellite link and exchange the signal light with the laser module and the first optical comb module, wherein the signal light includes laser signal light and first optical comb pulse light;
a laser module configured to generate or process the laser signal light and exchange the laser signal light with the first transmitting or receiving system, wherein the laser signal light is configured to carry communication information;
a first optical comb module configured to generate or process the first optical comb pulse light and exchange the first optical comb pulse light with the first transmitting or receiving system, wherein the first optical comb pulse light is configured to carry time-frequency information; and
a beacon light module, wherein the signal light further comprises a beacon light, the beacon light module configured to generate or process a beacon light and exchange the beacon light with the first transmitting or receiving system;
wherein the first transmitting or receiving system comprises:
an optical antenna configured to transmit or receive beacon light, laser signal light, and first optical comb pulse light;
a transceiver splitter configured to combine or split a transmission optical path or a reception optical path of the beacon light, the laser signal light, and the first optical comb pulse light;
a turntable on which the optical antenna is arranged, wherein adjustment within a coarse tracking accuracy range of the visual axis direction of the optical antenna is performed by rotation of the turntable; and
a fast mirror configured to make an adjustment within a fine tracking accuracy range of the boresight pointing of the optical antenna, wherein the fine tracking accuracy range is less than the coarse tracking accuracy range.
2. A method of time-frequency transfer and communication using the integrated femtosecond optical comb-based time-frequency transfer and communication system of claim 1, wherein the time-frequency transfer and communication is performed by a first said system and a second said system, the method comprising the steps of:
receiving, by a first transmitting or receiving system of a first said system, beacon light emitted by a second said system;
acquiring, by a beacon light module of a first said system, an alignment error of a visual axis pointing between optical antennas of the first and second said systems from said beacon light, and correcting said visual axis pointing by a two-dimensional servo turret and/or a fast mirror of the first said system to establish an inter-satellite link between the first and second said systems;
receiving laser signal light emitted by a second system and first optical comb pulse light by a first emitting or receiving system of the first system;
generating and emitting laser signal light by a laser module of a first said system and processing the laser signal light emitted by a second said system for communication between the first and second said systems; and
the first optical comb pulse light is generated and emitted by a first optical comb module of a first said system and the first optical comb pulse light emitted by a second said system is processed for time-frequency transfer between the first and second said systems.
3. A time-frequency transfer and communication integrated system based on a femtosecond optical comb, comprising:
a second transmitting or receiving system configured to transmit or receive second optical comb pulse light over the inter-satellite link; and
a second optical comb module configured to generate or process second optical comb pulse light and exchange the second optical comb pulse light with the second transmitting or receiving system, wherein the second optical comb pulse light is configured to carry time-frequency information or to carry communication information by modulating amplitude;
wherein the second optical comb module comprises:
a first coupler configured to split and transmit the second comb pulse light to a first balance detector and a first photodetector;
a first balance detector configured to detect and process time-frequency information of the second optical comb pulse light; and
and a first photodetector configured to detect the amplitude of the second optical comb pulse light, and determine whether the second optical comb pulse light carries communication information according to the amplitude, discard time-frequency information if the communication information is carried, and process the communication information.
4. A method of time-frequency transfer and communication using the integrated femtosecond optical comb-based time-frequency transfer and communication system of claim 3, wherein the time-frequency transfer and communication is performed by a third said system and a fourth said system, the method comprising the steps of:
generating second optical comb pulse light carrying time-frequency information or communication information in a time-sharing way by a second optical comb module of the third system;
transmitting, by a third of said systems, said second comb pulse light to a fourth of said systems;
splitting and transmitting the second comb pulse light by a first coupler of a fourth said system to a first balance detector and a first photodetector of the fourth said system;
detecting and processing time-frequency information of the second optical comb pulse light by a first balance detector of the fourth system; and
detecting the amplitude of the second optical comb pulse light by the first photoelectric detector of the fourth system, determining whether the second optical comb pulse light carries communication information or not according to the amplitude, discarding time-frequency information if the second optical comb pulse light carries the communication information, and processing the communication information.
5. A time-frequency transfer and communication integrated system based on a femtosecond optical comb, comprising:
a third transmitting or receiving system configured to transmit or receive third optical comb pulse light over the inter-satellite link; and
a third optical comb module configured to generate or process third optical comb pulse light and exchange the third optical comb pulse light with the third transmitting or receiving system, wherein the third optical comb pulse light is configured to carry time-frequency information and carry communication information by modulating amplitude;
wherein the third optical comb module comprises:
a second coupler configured to split and transmit the third comb pulse light to a second balanced detector and a second photodetector;
a second balance detector configured to detect and process time-frequency information of the third optical comb pulse light; and
a second photodetector configured to detect and process communication information of the third optical comb pulse light.
6. A method of time-frequency transfer and communication using the integrated femtosecond optical comb-based time-frequency transfer and communication system of claim 5, wherein the time-frequency transfer and communication is performed by the fifth and sixth systems, the method comprising the steps of:
generating third optical comb pulse light by a third optical comb module of the fifth system;
transmitting, by a fifth said system, said third comb pulse light to a sixth said system;
splitting and transmitting the third comb pulse light by a second coupler of a sixth said system to a second balanced detector and a second photodetector of the sixth said system;
detecting and processing time-frequency information of the third optical comb pulse light by a second balance detector of the sixth system; and
and detecting and processing the communication information of the third optical comb pulse light by a second photoelectric detector of the sixth system.
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