CN113890618B - Receiving and transmitting integrated device and method based on photon time compression and stretching - Google Patents
Receiving and transmitting integrated device and method based on photon time compression and stretching Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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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
- H04B10/40—Transceivers
- H04B10/43—Transceivers using a single component as both light source and receiver, e.g. using a photoemitter as a photoreceiver
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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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
Abstract
The invention discloses a receiving and transmitting integrated device and method based on photon time compression and stretching. The invention relates to a receiving and transmitting integrated device, which is characterized in that a mode-locked laser, a first section of dispersion optical fiber, a first phase modulator, a dispersion compensation optical fiber and a first photoelectric detector are sequentially connected through optical fibers, a modulated electric signal is subjected to phase modulation through the first phase modulator, and the first photoelectric detector transmits an output electric signal to a second filter after filtering through a first filter; the mode-locked laser, the second section of dispersion optical fiber, the second phase modulator, the third section of single-mode dispersion optical fiber and the second photoelectric detector are sequentially connected through optical fibers, signals are transmitted to the second phase modulator through the second filter, and output signals of the second photoelectric detector are output through the radio frequency cable. The invention has simple structure, easy integration, faster sending and processing speed than the electrical method, and lower transmission loss.
Description
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly relates to a method for compressing and stretching radio-frequency electric signals by adopting a photonics method, wherein the radio-frequency electric signals are transmitted and received through an antenna or transmitted by a coaxial cable, so that the loss of signal energy in the transmission process is greatly reduced.
Background
The high-frequency signal is a signal with higher frequency as the name implies, and has the characteristics of small distortion rate, stronger recoverability and strong anti-interference capability. For low frequency signals, the properties of the signals are easily affected by the obstruction of the ground and air objects. Therefore, the high-frequency signal is more suitable for wire radiation and reception, and has higher radiation efficiency and reception efficiency. Thus, smaller signal power can be adopted, the signal can be propagated for a longer distance, and higher receiving sensitivity can be obtained.
In the field of communications, it is desirable that the loss of a signal during transmission be as small as possible, so if a signal to be transmitted is first amplified in frequency and then transmitted, and the frequency of the signal is restored at the receiving end, low-loss transmission of the signal can be achieved.
The rf transceiver system has different components according to its application purpose and usage environment. However, in view of the operating principle of a general rf transceiver system, the rf transmitter, the rf receiver, and the antenna are basic components of the system. The radio frequency transmitter is constructed and operated by converting a low-frequency baseband signal into a corresponding high-frequency signal through means of modulation, power amplification, up-conversion, filtering, etc., and transmitting the processed signal through an antenna. The radio frequency receiver is constructed and operated by selecting a useful signal required by a basic frequency band from a plurality of signals received by an antenna, amplifying the useful signal, and converting the signal into a signal meeting the required basic frequency band through two times of down-conversion.
With the development of scientific technology, electronic devices have inherent electronic bottlenecks, and are difficult to adapt to the development process of large bandwidth, high speed and low loss in the future. By combining a photonics method, a new solution direction is provided for the method, the method has the advantages of low loss, easiness in tuning, electromagnetic interference resistance and the like, more and more attention is paid to spectral analysis by using an optical method, and extensive research is carried out.
As early as the 20 th century, Coppinger, F., A.S. Bhushan, and B.Jalali. "Photonic time stretch and its application to analog-to-digital conversion," IEEE Transactions on microwave the same and technical 47.7(1999): 1309. 1314. Photon Time Stretching (PTS) was first proposed by the Jalali group at the university of California los Angeles division and is a well-known Photonic technology that relaxes the requirements on the sampling rate of electronic ADCs by first slowing the incoming high speed signal. Many subsequent researches on photon time stretching are focused on a signal receiving end, the photon time stretching method is similar to the principle of a radio frequency receiver, and in brief, a PTS system adopts a multi-wavelength light source as a signal source, and light with different wavelengths transmitted in an optical fiber generates relative delay. After passing through a circle of single mode fiber, the ultrashort optical pulse emitted from the signal source becomes a broadened chirp pulse, and is modulated by the electro-optical modulator. The modulated pulses are then passed through a second dispersive medium, resulting in further broadening of the chirped pulses. By extracting the envelope of the output pulses, the original analog signal can be obtained.
On the other hand, this method can also be used on a signal transmission system. The modulated low-frequency signal is used for amplifying the frequency by a certain multiple to generate a high-frequency signal carrying information, and the high-frequency signal is used for propagation in a complex propagation environment.
Disclosure of Invention
Based on the phenomenon, the invention provides a receiving and transmitting integrated device and method based on photon time compression and stretching.
The invention realizes the compression and the stretching of the electric signals by utilizing the different propagation speeds of the optical carriers with different wavelengths in the dispersion medium, thereby realizing the high-efficiency transmission of the signals.
The invention adopts the following technical scheme:
the receiving and transmitting integrated device based on photon time compression and stretching comprises a mode-locked laser (1), a first section of dispersion optical fiber (2), a first phase modulator (3), a dispersion compensation optical fiber (5), a first photoelectric detector (6), a first filter (7), a second section of dispersion optical fiber (9), a second phase modulator (10), a second filter (12), a third section of single-mode dispersion optical fiber (13) and a second photoelectric detector (14); the mode-locked laser comprises a mode-locked laser (1), a first section of dispersion optical fiber (2), a first phase modulator (3), a dispersion compensation optical fiber (5) and a first photoelectric detector (6), wherein the first phase modulator (3), the dispersion compensation optical fiber and the first photoelectric detector (6) are sequentially connected through optical fibers, a modulation electric signal (4) is subjected to phase modulation through the first phase modulator (3), and the first photoelectric detector (6) sends an output electric signal to a second filter (12) after being filtered through a first filter (7); the mode-locked laser (1), the second section of dispersion optical fiber (9), the second phase modulator (10), the third section of single-mode dispersion optical fiber (13) and the second photoelectric detector (14) are sequentially connected through optical fibers, signals are transmitted to the second phase modulator (10) through the second filter (12), and output signals of the second photoelectric detector (14) are output through a radio frequency cable.
The invention relates to a receiving and transmitting integrated device based on photon time compression and photon time stretching. The signal sending module comprises a mode-locked laser (1), a first section of dispersion optical fiber (2), a first phase modulator (3), a dispersion compensation optical fiber (5), a first photoelectric detector (6) and a first filter (7), and the signal receiving module comprises a mode-locked laser (1), a second section of dispersion optical fiber (9), a second phase modulator (10), a second filter (12), a third section of single-mode dispersion optical fiber (13) and a second photoelectric detector (14). The signal input port is positioned at the radio frequency input port of the first phase modulator (3), and is transmitted through the signal transmitting system, the signal receiving system receives an external signal, and the external signal is output from the output port of the second photoelectric detector (14) through the signal receiving system.
Preferably, the optical signal generated by the mode-locked laser (1) has a small time width of about 90 femtoseconds and corresponds to an optical signal with a frequency spectrum bandwidth of 10THz, so as to ensure that the subsequent processing can be accurately performed.
An electrical signal (4) to be compressed is input to the phase modulator (3). An electric signal to be stretched after being received from the outside by a receiving antenna (11) and processed by a second filter (12) is input to a phase modulator (10).
Preferably, the dispersion coefficients of the two sections of the first section of the dispersion optical fiber (2) and the dispersion compensation optical fiber (5) are opposite, the dispersion coefficients of the second section of the dispersion optical fiber (9) and the third section of the dispersion optical fiber (13) are the same, and the lengths of the four sections of the dispersion optical fiber satisfy a certain relationship.
Preferably, in a time compression system consisting of a mode-locked laser (1), a first section of dispersion fiber (2), a first phase modulator (3), a dispersion compensation fiber (5), a first photodetector (6) and a first filter (7), the lengths of the first section of dispersion fiber (2) and the dispersion compensation fiber (5) are determined by a fixed coefficient M; assuming that the unit length is DeltaL, the length of the first section of dispersive optical fiber (2) is M DeltaL, and the length of the dispersion compensation optical fiber (5) is (M-1) DeltaL.
Preferably, the fixed coefficient M is a compression and stretching coefficient, namely, the frequency of the input modulation electric signal (4) is M times of the original frequency when passing through a compression system, and if the signal received by the receiving antenna (11) is the electric signal generated by the compression system, the frequency is restored to the original signal, namely, the modulation electric signal (4) when passing through a time stretching system.
Preferably, in a time stretching system composed of the mode-locked laser (1), the second section of dispersion fiber (9), the second phase modulator (10), the second filter (12), the third section of single-mode dispersion fiber (13) and the second photodetector (14), the dispersion coefficients of the second section of dispersion fiber (9) and the third section of dispersion fiber (13) are the same, assuming the same unit length Δ L, the length of the second section of dispersion fiber (9) is Δ L, and the length of the third section of dispersion fiber (13) is (M-1) Δ L.
Preferably, the electrical signal generated by the photodetector (6) is transmitted and received by a wireless antenna, that is, the first photodetector (6) filters the output electrical signal by a first filter (7) and then transmits the filtered output electrical signal by a transmitting antenna (8); the electrical signal is received by a receiving antenna (11) and fed via a second filter (12) into a second phase modulator (10).
Preferably, the electrical signals transmitted by the antenna can also be transmitted directly by means of a coaxial cable, in particular by connecting the output of the first filter (7) to the input of the second filter (12).
The invention also discloses a photon time compression and stretching receiving and transmitting method based on the device, which comprises the following steps:
step one, a mode-locked laser (1) generates a single ultrashort pulse signal, and the single ultrashort pulse signal passes through a first section of single-mode dispersion optical fiber (2), so that the pulse signal is broadened on a time domain, namely, the frequency time mapping is carried out on the pulse signal. Meanwhile, the mode-locked laser (1) generates a single ultrashort pulse signal, and the single ultrashort pulse signal passes through a second section of single-mode dispersion fiber (9), so that the pulse signal is broadened on a time domain, namely, the frequency time mapping is carried out on the pulse signal;
and step two, the signal passes through a phase modulator (3) and is subjected to phase modulation by applying a modulation electric signal (4) to be transmitted.
And step three, compressing the modulated signal in a certain proportion on a time domain through a dispersion compensation fiber (5), and inputting the signal to an input port of a first photoelectric detector (6).
And step four, the output signal of the first photoelectric detector (6) is filtered by the first filter (7) and then is sent to the second filter (12).
And step five, modulating the pulse signal stretched in the step one by a second phase modulator (10) through a signal filtered by a second filter (12), wherein the signal transmitted by the transmitting antenna (8) is directly received and then the next operation is carried out.
And step six, stretching the modulated signal in the same proportion on a time domain through a third section of single-mode dispersion optical fiber (13), inputting the stretched signal to an input port of a first photoelectric detector (14), and finally outputting the stretched signal as an electric signal with the same frequency component as the modulated signal (4).
A single ultrashort pulse signal is generated through a mode-locked laser, is widened after passing through a first section of dispersion medium, namely frequency-time mapping occurs, then phase modulation is carried out in a phase modulator by using a modulation signal, then the modulated signal passes through a second section of dispersion medium, compression or stretching of the signal is achieved, and the signal is converted into an electric signal with corresponding frequency through a photoelectric detector. According to the requirements of transmission and reception, filters are respectively added before the transmitting antenna and after the receiving antenna to filter out signals except the target signal.
The invention has the beneficial effects that:
the receiving and transmitting integrated device based on photon time compression and photon time stretching has a simple structure and is beneficial to integrated use in the future; the optical fiber is used as a signal processing medium, so that external electromagnetic interference is avoided to a certain extent; the transmitting end can generate a high frequency signal to resist the loss in wireless transmission.
Drawings
Fig. 1 is a device connection diagram, which is a main schematic diagram of a transmitting-receiving integrated device based on photon time compression and photon time stretching according to an embodiment of the present invention.
In fig. 1:
1. the device comprises a mode-locked laser, 2, a first section of single-mode dispersion optical fiber, 3, a first phase modulator, 4, a modulation electric signal, 5, a dispersion compensation optical fiber, 6, a photoelectric detector, 7, a first filter, 8, a sending antenna, 9, a second section of single-mode dispersion optical fiber, 10, a second phase modulator, 11, a receiving antenna, 12, a second filter, 13, a third section of single-mode dispersion optical fiber, 14 and a second photoelectric detector.
Wherein, the solid line is the optical fiber connecting wire, and the dotted line is the circuit connecting wire.
Fig. 2 is a diagram of experimental test results of a transmission system and a time compression system, specifically, a time domain waveform and a frequency spectrum at an output end of a first photodetector after an input signal of the system is a radio frequency signal of 6GHz, and after the system is compressed by 3 times, it can be seen from the diagram that the frequency of the obtained radio frequency signal is about 18GHz, which meets the theoretical requirement of photon time compression.
Fig. 3 is a diagram of experimental test results of a receiving system and a time stretching system, specifically, a time domain waveform and a frequency spectrum at an output end of a second photodetector after an input signal of the system is a radio frequency signal of 18GHz, and after the system is stretched by 3 times, it can be seen from the diagram that the frequency of the obtained radio frequency signal is about 6GHz, which meets the theoretical requirement of photon time stretching.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the accompanying drawings of the specification:
as shown in fig. 1, the transceiver integrated device based on photon time compression and photon time stretching in this embodiment includes a mode-locked laser 1, a first single-mode dispersion fiber 2, a first phase modulator 3, a dispersion compensation fiber 5, a photodetector 6, a first filter 7, a transmitting antenna 8, a second single-mode dispersion fiber 9, a second phase modulator 10, a receiving antenna 11, a second filter 12, a third single-mode dispersion fiber 13, and a second photodetector 14.
The modulated electric signal 4 is input into a radio frequency input port of the first phase modulator 3; the mode-locked laser 1, the first section of dispersion optical fiber 2, the first phase modulator 3, the dispersion compensation optical fiber 5 and the first photoelectric detector 6 are sequentially connected through optical fibers, the first photoelectric detector 6, the filter 7 and the transmitting antenna 8 are sequentially connected through a coaxial cable, and output electric signals are filtered through the first filter 7 and then transmitted through the transmitting antenna 8.
The mode-locked laser 1, the second section of dispersion optical fiber 9, the second phase modulator 10, the third section of single-mode dispersion optical fiber 13 and the second photoelectric detector 14 are sequentially connected through optical fibers, and the receiving antenna 11, the second filter 12 and the second phase modulator 10 are sequentially connected through a coaxial cable; an external signal is received by the receiving antenna 11 and is transmitted to the second phase modulator 10 via the second filter 12, and an output signal of the second photodetector 14 is output through a radio frequency cable.
The optical signal generated by the mode-locked laser 1 is an optical signal with a small time width of about 90 femtoseconds and a corresponding frequency spectrum bandwidth of 10THz, so as to ensure that the subsequent processing can be accurately carried out, and the transmitting end and the receiving end can share the same laser source.
The dispersion coefficients of the two sections of the first section of the dispersion optical fiber 2 and the dispersion compensation optical fiber 5 are opposite, the dispersion coefficients of the second section of the dispersion optical fiber 9 and the third section of the dispersion optical fiber 13 are the same, and the lengths of the four sections of the dispersion optical fiber satisfy a certain relation. Assuming that the unit length is Δ L and the fixed coefficient is M, the corresponding lengths of the four optical fibers are M Δ L, (M-1) Δ L, (M-1) Δ L.
The implementation steps of the receiving and transmitting integrated device based on photon time compression and photon time stretching are as follows:
step one, a mode-locked laser 1 generates a single ultrashort pulse signal, and the single ultrashort pulse signal passes through a first section of single-mode dispersion optical fiber 2, so that the pulse signal is broadened in a time domain, namely, the pulse signal is subjected to frequency-time mapping. The steps are performed simultaneously, the mode-locked laser 1 generates a single ultrashort pulse signal, and the pulse signal is widened on a time domain through the second section of single-mode dispersion fiber 9, namely, the frequency time mapping is performed on the pulse signal.
And step two, the signal passes through a phase modulator 3 and is subjected to phase modulation by applying a modulation signal 4 to be transmitted.
And step three, compressing the modulated signal in a certain proportion on a time domain through a dispersion compensation fiber 5, and inputting the signal to an input port of a first photoelectric detector 6.
And fourthly, filtering the output signal of the first photoelectric detector 6 by a first filter 7, and transmitting the signal to the outside by a transmitting antenna 8.
Step five, the stretched signal is modulated by the second phase modulator 10 to an external signal which is received by the receiving antenna 11 and filtered by the second filter 12.
And step six, stretching the modulated signal in the same proportion on a time domain through a third section of single-mode dispersion optical fiber 13, so that the frequency of the modulated signal is restored to the frequency of the original signal, the modulated signal is input into an input port of a first photoelectric detector 14, and finally the modulated signal is output as an electric signal with the same frequency component as the modulated signal 4.
The specific working principle related by the invention is as follows:
for convenience of calculation, it is assumed that the pulse signal generated by the mode-locked laser is g (t), and the expression is g (t) ═ exp (-t) 2 /τ 2 ) Wherein τ is the half-width of the time domain when the amplitude of the pulse signal is 1/e of the maximum amplitude, and the pulse duration is extremely short, and the pulse signal which is broadened by the dispersive medium can be obtained through the first section of single-mode dispersive optical fiber and has the length of M Δ L, wherein M is a fixed coefficient, and Δ L is a self-defined unit length.
Then the signal cos (ω) RF t) accessing the phase modulator for phase modulation, passing through a dispersion compensation fiber with second-order dispersion coefficient opposite to that of the first section of single-mode dispersion fiber and fiber length of (M-1) delta L, and further obtaining an output signal y through a photoelectric detector 1 (t) the expression is:
y 1 (t)＝env 1 (t)·A 1 (t)·cos(Mω RF t)
wherein, env 1 (t) is an envelope function of the signal determined by the pulse signal g (t) generated by the mode-locked laser, A 1 (t) is the amplitude function after compression, and it can be seen from the above expression that the frequency of the target signal is raised to M times. Obtained byThe high frequency signal is filtered by a filter and then transmitted through a transmitting antenna.
The other receiving chain can generate pulse signals by the same mode-locked laser, and the expression is g (t) exp (-t) 2 /τ 2 ) And the pulse signal which is widened by the dispersion medium can be obtained through the second section of single-mode dispersion optical fiber with the length of delta L.
Then compressing the high frequency signal cos (M omega) RF t) accessing the fiber to a phase modulator for phase modulation, passing through a third section of dispersion fiber with the same second-order dispersion coefficient as the second section of dispersion fiber and the fiber length of (M-1) delta L, and further obtaining an output signal y through a photoelectric detector 2 (t) the expression is:
y 2 (t)＝env 2 (t)·A 2 (t)·cos(ω RF t)
wherein env 2 (t) is also an envelope function of the signal, determined by the pulse signal g (t) generated by the mode-locked laser, A 2 And (t) is an amplitude function after stretching, and the frequency of the received signal is reduced to 1/M of the original frequency as can be seen from the expression, so that the frequency of the received signal is equivalent to that of the signal transmitted before, and the purpose of transmitting and receiving the signal is achieved.
The invention discloses a receiving and transmitting integrated device and method based on photon time compression and photon time stretching, and relates to the field of microwave photonics. Structurally, the invention can be roughly divided into two parts, wherein the first part consists of a mode-locked laser, a first section of single-mode dispersion optical fiber, a first phase modulator, a section of dispersion compensation optical fiber, a first photoelectric detector, a first filter and a sending antenna and is used as a high-frequency signal generating module; the second part consists of a mode-locked laser, a second section of single-mode dispersion optical fiber, a second phase modulator, a receiving antenna, a third section of single-mode dispersion optical fiber and a second photoelectric detector and serves as an external signal receiving module. The two parts can share the same mode-locked laser as a multi-wavelength light source. The invention has simple structure, easy integration, faster sending and processing speed than the electricity method, lower transmission loss and wide application prospect in the fields of radar systems, wireless communication, software radio and the like.
In the above embodiment, the wireless antenna may be replaced by a coaxial cable, that is, the output end of the first filter and the input end of the second filter are connected by the coaxial cable to perform signal transceiving.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The receiving and transmitting integrated device based on photon time compression and stretching is characterized by comprising a mode-locked laser (1), a first section of dispersion optical fiber (2), a first phase modulator (3), a dispersion compensation optical fiber (5), a first photoelectric detector (6), a first filter (7), a second section of dispersion optical fiber (9), a second phase modulator (10), a second filter (12), a third section of single-mode dispersion optical fiber (13) and a second photoelectric detector (14); the mode-locked laser (1), the first section of dispersion optical fiber (2), the first phase modulator (3), the dispersion compensation optical fiber (5) and the first photoelectric detector (6) are sequentially connected through optical fibers, the modulation electric signal (4) is subjected to phase modulation through the first phase modulator (3), and the first photoelectric detector (6) sends an output electric signal to the second filter (12) after filtering through the first filter (7); the mode-locked laser (1), the second section of dispersion optical fiber (9), the second phase modulator (10), the third section of single-mode dispersion optical fiber (13) and the second photoelectric detector (14) are sequentially connected through optical fibers; the signal is fed via a second filter (12) into a second phase modulator (10), and the output signal of a second photodetector (14) is output via a radio frequency cable.
2. The integrated transceiver based on photon time compression and stretching as claimed in claim 1, wherein the time width of the optical signal generated by the mode-locked laser (1) is 90 femtoseconds, corresponding to the optical signal with the total frequency spectrum bandwidth of 10 THz.
3. The integrated transceiver based on photon time compression and stretching as claimed in claim 1, wherein the dispersion coefficients of the two sections of the dispersion fiber (2) and the dispersion compensation fiber (5) are opposite.
4. The integrated photonic time compression and stretching-based transceiver device according to claim 3, wherein the lengths of the first segment of dispersive optical fiber (2) and the dispersion compensating optical fiber (5) are determined by a fixed coefficient M; assuming that the unit length is DeltaL, the length of the first section of dispersive optical fiber (2) is M DeltaL, and the length of the dispersion compensation optical fiber (5) is (M-1) DeltaL.
5. Transmit-receive integrated device based on photon time compression and stretching according to claim 4, characterized in that the fixed coefficient M is the compression and stretching coefficient, i.e. the input modulated electrical signal (4) passes through the compression system with frequency M times the original frequency.
6. The integrated transceiver based on photon time compression and stretching as claimed in claim 1, wherein the second dispersion fiber (9) and the third dispersion fiber (13) have the same dispersion coefficient, assuming a unit length Δ L, the length of the second dispersion fiber (9) is Δ L, and the length of the third dispersion fiber (13) is (M-1) Δ L.
7. The integrated transceiver based on photon time compression and stretching as claimed in claim 1, characterized in that the electrical signal generated by the photodetector (6) is transmitted and received by a wireless antenna, i.e. the first photodetector (6) filters the output electrical signal by the first filter (7) and then transmits the filtered output electrical signal by the transmitting antenna (8); the electrical signal is received by a receiving antenna (11) and fed via a second filter (12) into a second phase modulator (10).
8. The integrated transceiver based on photon time compression and stretching as claimed in claim 1, wherein the output end of the first filter (7) is connected with the input end of the second filter (12) through a coaxial cable for signal transceiving.
9. A method for transmitting and receiving photon time compression and stretching based on the integrated transmitting and receiving device of any one of claims 1 to 8, characterized by comprising the following steps:
step one, a mode-locked laser (1) generates a single ultrashort pulse signal, and the single ultrashort pulse signal passes through a first section of single-mode dispersion optical fiber (2), so that the pulse signal is broadened on a time domain, namely, the pulse signal is subjected to frequency-time mapping; meanwhile, the mode-locked laser (1) generates a single ultrashort pulse signal, and the single ultrashort pulse signal passes through a second section of single-mode dispersion fiber (9), so that the pulse signal is broadened on a time domain, namely, the frequency time mapping is carried out on the pulse signal;
secondly, the signal passes through a phase modulator (3) and is subjected to phase modulation by applying a modulation electric signal (4) to be transmitted;
thirdly, the modulated signal is compressed in a certain proportion on a time domain through a dispersion compensation fiber (5) and is input to an input port of a first photoelectric detector (6);
fourthly, the output signal of the first photoelectric detector (6) is filtered by the first filter (7) and then is sent to the second filter (12);
fifthly, modulating the pulse signal stretched in the first step by a second phase modulator (10) to the signal filtered by a second filter (12);
and step six, stretching the modulated signal in the same proportion on a time domain through a third section of single-mode dispersion optical fiber (13), inputting the stretched signal to an input port of a first photoelectric detector (14), and finally outputting the stretched signal as an electric signal with the same frequency component as the modulated electric signal (4) in the step two.
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