CN116073907B - Broadband radio frequency signal copying device and method based on coherent microwave photons - Google Patents
Broadband radio frequency signal copying device and method based on coherent microwave photons Download PDFInfo
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- CN116073907B CN116073907B CN202310201864.9A CN202310201864A CN116073907B CN 116073907 B CN116073907 B CN 116073907B CN 202310201864 A CN202310201864 A CN 202310201864A CN 116073907 B CN116073907 B CN 116073907B
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
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- 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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- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
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- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
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Abstract
The invention discloses a broadband radio frequency signal copying device and a method based on coherent microwave photons, wherein the device comprises a radio frequency input end and a radio frequency output end, and the device also comprises an electro-optical conversion unit, a signal copying unit, a gain adjusting unit and a photoelectric conversion unit. The invention has the technical advantages of realizing high fidelity, low noise, low delay and large bandwidth radio frequency signal duplication, and can realize the adjustment of the delay time interval and the amplitude of the duplicated signal.
Description
Technical Field
The invention belongs to the technical field of microwave photons, and particularly relates to a broadband radio frequency signal copying device and method based on coherent microwave photons.
Background
The current traditional implementation mode of copying the radio frequency signals is mainly realized by using a digital acquisition and storage mode. The method comprises the steps of firstly carrying out high-speed acquisition and conversion on an input radio frequency signal into a digital signal by using a high-speed analog-to-digital conversion (ADC), storing quantized data by using a storage device, and then restoring the digital signal into the radio frequency signal by using a high-speed digital-to-analog conversion (DAC) to send the radio frequency signal, so that the input radio frequency signal is duplicated for multiple times.
However, the mode of implementing wideband radio frequency signal duplication by adopting the digital method is limited by the quantization bit number, acquisition rate, processing bandwidth, storage rate and other factors of the ADC and the DAC, and low-delay and high-fidelity duplication of radio frequency signals cannot be implemented. Meanwhile, for the duplication of ultra-wideband radio frequency signals, extremely large software and hardware resources are required to be consumed, and the technical problem of synchronization of a plurality of processing cores also exists.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a broadband radio frequency signal copying device and method based on coherent microwave photons, which realize the copying of broadband radio frequency signals with high fidelity, low noise, low delay and large bandwidth, thereby breaking through the bottleneck of processing by the traditional digital method and realizing the adjustment of delay time and amplitude of copying signals.
The aim of the invention is achieved by the following technical scheme:
a broadband radio frequency signal replication device based on coherent microwave photons, comprising a radio frequency input and a radio frequency output, the device further comprising:
the photoelectric conversion unit comprises a double-parallel modulator, a laser and a first optical splitter, wherein the laser is connected with the first optical splitter, and one output end and the radio frequency input end of the first optical splitter are respectively connected with the double-parallel modulator;
the signal copying unit comprises a light combiner, a tunable light delay device, a second optical branching device and a first optical amplifier, wherein the light combiner is respectively connected with the double-parallel modulator of the electro-optical conversion unit and the second optical branching device, and the first optical amplifier is respectively connected with one output end of the light combiner and one output end of the second optical branching device;
the gain adjusting unit comprises a second optical amplifier and an adjustable optical attenuator, and the second optical amplifier is respectively connected with the adjustable optical attenuator and one path of output end of the first optical splitter;
the photoelectric conversion unit comprises an optical mixer and a balance detector, the optical mixer is respectively connected with one output end of the balance detector and one output end of the second optical splitter, and the balance detector is connected with the radio frequency output end.
Further, the bias control mode of the dual parallel modulator is a carrier rejection single sideband mode.
Further, the radio frequency input end is connected with the double parallel modulator through an input microwave channel, and the input microwave channel comprises a microwave amplifier, a detector and an adjustable microwave filter.
Further, the radio frequency output end is connected with the balance detector through an output microwave channel, and the output microwave channel comprises a microwave amplifier, a detector and an adjustable microwave filter.
Further, the first optical amplifier and the second optical amplifier comprise erbium-doped fiber amplifiers.
Further, the balance detector comprises a semiconductor detector.
On the other hand, the invention also provides a broadband radio frequency signal replication method based on coherent microwave photons, the method is realized by adopting any device, and the method comprises the following steps:
the electro-optical conversion unit responds to the received radio frequency input signal and the optical signal, converts the radio frequency input signal into an optical carrier radio frequency signal by utilizing the broadband characteristic of microwave photons, and converts the optical signal into a radio frequency optical carrier signal and a local oscillator optical signal;
the optical carrier radio frequency signals are subjected to delay adjustment and feedback amplification by using a signal copying unit according to requirements to form copied optical carrier radio frequency signals, and the local oscillator optical signals are subjected to amplitude adjustment by using a gain adjustment unit according to requirements;
and synthesizing the adjusted local oscillator optical signal and the duplicated optical carrier radio frequency signal by utilizing a photoelectric conversion unit, and converting the synthesized local oscillator optical signal and the duplicated optical carrier radio frequency signal into a radio frequency output signal.
Further, the method also includes detecting the input radio frequency signal and selecting a frequency for the frequency of the input radio frequency signal.
Further, the method also includes detecting the output radio frequency signal and selecting a frequency for the frequency of the output radio frequency signal.
The invention has the beneficial effects that:
the invention directly converts the radio frequency signal into the optical carrier radio frequency signal by utilizing the broadband characteristic of the microwave photon, realizes the adjustable delay and the duplication of the optical carrier radio frequency signal by combining the adjustable delay device, and converts the optical carrier radio frequency signal into the radio frequency signal by utilizing the detector. Compared with the traditional scheme adopting a digital processing mode, the invention has the characteristics of low delay, low noise, high output power, high fidelity and large radio frequency bandwidth, and can realize the adjustment of delay time and amplitude of the replica signal.
Drawings
FIG. 1 is a schematic circuit diagram of a broadband radio frequency signal copying device based on coherent microwave photons according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a broadband radio frequency signal replication method based on coherent microwave photons according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the signal duplication result according to an embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The traditional method adopts a digital method to realize the copying of the broadband radio frequency signals, is limited by the quantization bit numbers of the ADC and the DAC, the acquisition rate, the processing bandwidth, the storage rate and other factors, and cannot realize the copying of the radio frequency signals with low delay and high fidelity. Meanwhile, for the duplication of ultra-wideband radio frequency signals, extremely large software and hardware resources are required to be consumed, and the technical problem of synchronization of a plurality of processing cores also exists.
In order to solve the above technical problems, the following embodiments of the broadband radio frequency signal replication device and method based on coherent microwave photons of the present invention are presented.
Example 1
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a broadband radio frequency signal replication device based on coherent microwave photons according to the present embodiment, where the device includes an electro-optical conversion unit, a signal replication unit, a gain adjustment unit, and an optical-electrical conversion unit.
Wherein, the electric-optical conversion part is connected with the input ends of the signal copying part and the gain adjusting part through optical fibers; the output ends of the signal copying part and the gain adjusting part are respectively connected with the photoelectric conversion part through optical fibers.
The electric-optical conversion part comprises a laser, a double parallel modulator and a first optical splitter, and aims to realize that an input radio frequency signal is converted into an optical carrier radio frequency signal after being subjected to microwave amplification, frequency selection, detection and other processing, and the converted optical signal is respectively sent to the signal copying part and the gain adjusting part.
The signal copying part comprises an optical multiplexer, an adjustable optical delay device, a first optical amplifier and a second optical splitter, and aims to carry out adjustable delay and feedback adjustable amplification on the optical carrier radio frequency signals so as to form a series of copied optical carrier radio frequency signals with adjustable amplitude and time.
The gain adjusting part comprises a second optical amplifier and an adjustable optical attenuator, and aims to adjust the intensity of the local oscillation optical signal.
The optical-electric conversion part comprises an optical mixer, a balance optical detector and an output microwave channel, and is used for synthesizing the local oscillation optical signal and the radio frequency carrier optical signal, converting the local oscillation optical signal and the radio frequency carrier optical signal into radio frequency signals by the balance detector, and amplifying, selecting and detecting the copied radio frequency signals.
The input radio frequency signal is input through an input microwave channel, the input microwave channel is connected with a radio frequency port of a double-parallel modulator, the laser is connected with an input port of a first optical splitter, one output port of the first optical splitter is connected with an optical input port of a double-parallel modulator, the other output port of the first optical splitter is connected with an optical input port of a second optical amplifier, the optical output port of the double-parallel modulator is connected with an input port of a light combiner, the output port of the light combiner is connected with an input port of a light adjustable delay device, the output port of the light adjustable delay device is connected with an input port of the second optical splitter, one output port of the second optical splitter is connected with an input port of the first optical amplifier, the output port of the first optical amplifier is connected with another input port of the light adjustable attenuator, the output port of the light adjustable attenuator is connected with one input port of the light mixer, the output port of the light mixer is connected with an optical input port of a balance detector, and the radio frequency output port of the balance detector is connected with a microwave output channel.
As an implementation manner, the bias control manner of the dual parallel modulator of this embodiment is: and a carrier suppression single sideband mode is adopted.
As an implementation manner, the input microwave channel of the embodiment internally comprises a microwave amplifier, a detector, an adjustable microwave filter and the like, and has the functions of detecting an input radio frequency signal and performing frequency selection processing on the frequency of the input radio frequency signal so as to realize the effect of reducing link noise.
As an implementation manner, the output microwave channel of the embodiment internally comprises a microwave amplifier, a detector, an adjustable microwave filter and the like, and has the functions of finishing the detection of an output radio frequency signal and performing frequency selection processing on the frequency of the output radio frequency so as to realize the effect of reducing link noise.
As an implementation manner, the first optical amplifier and the second optical amplifier of this embodiment are preferably Erbium Doped Fiber Amplifiers (EDFAs) for providing gain compensation to the feedback optical path, so as to implement an amplitude adjustment effect on the replica radio frequency signal.
As an implementation manner, the optical multiplexer of this embodiment is used to realize the effect of outputting the input two paths of optical signals after combining, and the combined-wave optical distribution ratio may be 1:1, 1:2, 1:4, and so on.
As an implementation manner, in this embodiment, the first optical splitter and the second optical splitter are configured to achieve an effect of splitting an input optical signal into two paths and outputting the two paths, where a splitting ratio may be 1:1, 1:2, 1:4, and so on.
Example 2
The embodiment realizes signal replication by the broadband radio frequency signal replication device based on coherent microwave photons provided by the previous embodiment.
Referring to fig. 2, as shown in fig. 2, a flow chart of a broadband radio frequency signal replication method based on coherent microwave photons provided in this embodiment is shown, and the method specifically includes the following steps:
step one: and responding to the received radio frequency input signal and the received optical signal, converting the radio frequency input signal into an optical carrier radio frequency signal by utilizing the broadband characteristic of microwave photons, and converting the optical signal into a radio frequency optical carrier signal and a local oscillator optical signal.
Specifically, the input radio frequency signal is processed by the input microwave channel and then is injected into the double parallel modulator so as to be converted into the optical carrier radio frequency signal. The optical signals output by the laser are injected into the optical input end of the first optical power divider and are respectively converted into radio frequency optical carrier signals of the microwave photon link by the double parallel modulators; the other output end of the first optical splitter provides a local oscillation optical signal of the microwave photon link and sends the local oscillation optical signal to the second optical amplifier.
Step two: and carrying out delay adjustment and feedback amplification on the optical carrier radio frequency signals according to the requirements to form duplicated optical carrier radio frequency signals, and carrying out amplitude adjustment on the local oscillator optical signals according to the requirements.
Specifically, the optical carrier radio frequency signal is replicated through the optical multiplexer, the adjustable optical delay device, the second optical branching device and the first optical amplifier, and the control function of the time interval and the amplitude of the optical carrier radio frequency signal is realized. The local oscillation optical signal realizes the amplitude control function of the local oscillation optical signal through the second optical amplifier and the adjustable optical attenuator.
In the reproduction process of the optical carrier radio frequency signal, the optical carrier radio frequency signal is input through one input port of the optical multiplexer, the output signal is output through an output port of the optical multiplexer, then the delay time adjustment of the optical carrier radio frequency signal is finished through the adjustable optical attenuator, then the optical carrier radio frequency signal is input through an input port of the second optical splitter, is output through an output port of the second optical splitter, which is connected with an input port of the first optical amplifier, and is amplified and adjusted by the optical amplifier, and finally, the signal input is realized through another input port of the optical multiplexer, so that the delay and gain control of the optical carrier signal are realized. And the gain adjusting part is used for realizing gain adjustment of the local oscillation light. The amplitude of the final duplicated radio frequency signal is determined by the square root of the product of the local oscillator light intensity and the optical carrier signal intensity, and the delay time interval of the duplicated radio frequency signal is determined by the time interval of the optical carrier signal.
Step three: and synthesizing the adjusted local oscillator optical signal and the duplicated optical carrier radio frequency signal, and converting the synthesized local oscillator optical signal and the duplicated optical carrier radio frequency signal into a radio frequency output signal.
Specifically, the local oscillator optical signal and the copy optical carrier radio frequency signal are converted into radio frequency signals through an optical mixer and a balance photoelectric detector, and then are processed by an output microwave channel and output.
Referring to fig. 3, a schematic diagram of the signal replication result of the embodiment is shown in fig. 3. As can be seen from the figure, the broadband radio frequency signal replication method based on coherent microwave photons provided in this embodiment achieves effective replication of the input radio frequency signal, the replication results respectively correspond to the replication signal 1, the replication signal 2, the replication signal 3, the replication signal 2 and the replication signal N, and based on this patent, effective control of the amplitude and the delay of each replication signal is achieved, and the control effects respectively correspond to the delay t1 and the amplitude a1 of the replication signal 1, the delay t2 and the amplitude a2 of the replication signal 2, the delay t3 and the amplitude a3 of the replication signal 3, and the delay t4 and the amplitude a4 of the replication signal 4.
The embodiment directly converts the radio frequency signal into the optical carrier radio frequency signal by utilizing the broadband characteristic of the microwave photon, realizes the adjustable delay and the duplication of the optical carrier radio frequency signal by combining the adjustable delay device, and converts the optical carrier radio frequency signal into the radio frequency signal by utilizing the detector. Compared with the traditional scheme adopting a digital processing mode, the invention has the characteristics of low delay, low noise, high output power, high fidelity and large radio frequency bandwidth, and can realize the adjustment of delay time and amplitude of the replica signal.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A broadband radio frequency signal replication device based on coherent microwave photons, comprising a radio frequency input and a radio frequency output, the device further comprising:
the photoelectric conversion unit comprises a double-parallel modulator, a laser and a first optical splitter, wherein the laser is connected with the first optical splitter, and one output end and the radio frequency input end of the first optical splitter are respectively connected with the double-parallel modulator;
the signal copying unit comprises a light combiner, a light adjustable delay device, a second optical divider and a first optical amplifier, wherein the light combiner is respectively connected with the double-parallel modulator of the electro-optical conversion unit and the input port of the light adjustable delay device, the output port of the light adjustable delay device is connected with the input port of the second optical divider, and the first optical amplifier is respectively connected with one output end of the light combiner and one output end of the second optical divider;
the gain adjusting unit comprises a second optical amplifier and an adjustable optical attenuator, and the second optical amplifier is respectively connected with the adjustable optical attenuator and one path of output end of the first optical splitter;
the photoelectric conversion unit comprises an optical mixer and a balance detector, the output port of the adjustable optical attenuator is connected with one input port of the optical mixer, the output port of the second optical divider is connected with the other input port of the optical mixer, the output port of the optical mixer is connected with the optical input port of the balance detector, and the balance detector is connected with the radio frequency output end.
2. The broadband radio frequency signal copying apparatus according to claim 1, wherein said bias control mode of said double parallel modulator is a carrier suppressed single sideband mode.
3. The coherent microwave photon based broadband radio frequency signal copying apparatus according to claim 1, wherein said radio frequency input is connected to said dual parallel modulator through an input microwave channel comprising a microwave amplifier, a detector and an adjustable microwave filter.
4. The broadband radio frequency signal replication device based on coherent microwave photons according to claim 1, wherein said radio frequency output is connected to said balance detector by an output microwave channel comprising a microwave amplifier, a detector and an adjustable microwave filter.
5. The coherent microwave photon based broadband radio frequency signal copying apparatus according to claim 1, wherein said first optical amplifier and said second optical amplifier comprise erbium doped fiber amplifiers.
6. The broadband radio frequency signal replication device based on coherent microwave photons as defined in claim 1, wherein said balanced detector comprises a semiconductor detector.
7. A method of broadband radio frequency signal replication based on coherent microwave photons, the method being implemented with the apparatus of any one of claims 1-6, the method comprising:
the electro-optical conversion unit responds to the received radio frequency input signal and the optical signal, converts the radio frequency input signal into an optical carrier radio frequency signal by utilizing the broadband characteristic of microwave photons, and converts the optical signal into a radio frequency optical carrier signal and a local oscillator optical signal;
the optical carrier radio frequency signals are subjected to delay adjustment and feedback amplification by using a signal copying unit according to requirements to form copied optical carrier radio frequency signals, and the local oscillator optical signals are subjected to amplitude adjustment by using a gain adjustment unit according to requirements;
and synthesizing the adjusted local oscillator optical signal and the duplicated optical carrier radio frequency signal by utilizing a photoelectric conversion unit, and converting the synthesized local oscillator optical signal and the duplicated optical carrier radio frequency signal into a radio frequency output signal.
8. The method of claim 7, further comprising detecting an input rf signal and selecting a frequency for the frequency of the input rf signal.
9. The method of claim 7, further comprising detecting the output rf signal and selecting a frequency for the frequency of the output rf signal.
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