CN113347054A - Terahertz single-port space network reflection coefficient measuring device and method - Google Patents
Terahertz single-port space network reflection coefficient measuring device and method Download PDFInfo
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- CN113347054A CN113347054A CN202110458722.1A CN202110458722A CN113347054A CN 113347054 A CN113347054 A CN 113347054A CN 202110458722 A CN202110458722 A CN 202110458722A CN 113347054 A CN113347054 A CN 113347054A
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Abstract
The embodiment of the invention discloses a terahertz single-port space network reflection coefficient measuring device and method, which can generate terahertz signals with the frequency range of more than 3THz, so that the measuring frequency exceeds 3THz, and the measuring frequency range is expanded; related modules and devices do not need to be replaced in the full-frequency measurement working process, so that the measurement efficiency and accuracy are improved; meanwhile, the measuring device provided by the invention eliminates the system errors introduced by each component by arranging the receiving reference link and the receiving measuring link and utilizing the calibration piece, thereby further improving the measuring accuracy.
Description
Technical Field
The invention relates to the technical field of radio measurement, in particular to a terahertz single-port space network reflection coefficient measuring device and method.
Background
The scattering parameter is a very important parameter in the field of radio measurement, and is a parameter representing the ratio between signal components passing through various paths, wherein the reflection coefficient represents the ratio of the input signal of a network port to the reflected signal of the port. Generally, a network reflection coefficient is directly measured by using a network analyzer, the basic principle of the operation of the network analyzer is that a vector signal sweep source inside the network analyzer generates a signal of a test frequency band, when a test signal passes through a network to be tested, part of the signal is reflected, the other part of the signal is transmitted or absorbed, a signal separation device inside the network analyzer separates incident waves and reflected waves of the network to be tested, a receiver inside the network analyzer receives the signal and extracts amplitude and phase information in the signal, and finally the reflection coefficient of the network to be tested is obtained through ratio operation.
In order to meet the test requirement of a single-port space network, a network analyzer converts a conventional coaxial or waveguide transmission form signal into space transmission by an external antenna method, and the measuring device has two problems in the use process: firstly, the measurement frequency range is insufficient, the current network analyzer is constructed based on a pure solid-state electronics technology, the measurement frequency range can reach 120GHz at most, the analysis frequency after the network analyzer is externally connected with a frequency expansion module can reach 1.1THz at most, the network analyzer is close to the limit of using the solid-state electronics technology, and the frequency range is further expanded with great difficulty; secondly, the operation is complicated, continuous broadband measurement cannot be realized, the frequency extension module, the waveguide and the antenna used by the network analyzer are limited in frequency range, modules and devices with different specifications must be used for measurement of different frequency bands, broadband measurement covering the whole frequency range is realized, the measurement system must be disassembled and assembled for many times, the terahertz frequency band waveguide and the antenna are highly difficult to install, and the boundary frequency position measurement error of each frequency band is extremely large, so that the requirement of continuous broadband measurement cannot be met.
Disclosure of Invention
The invention aims to provide a terahertz single-port space network reflection coefficient measuring device and method, the measuring frequency exceeds 3THz by the device and method provided by the invention, and the measuring frequency range is expanded; related modules and devices do not need to be replaced in the full-frequency measurement working process, so that the measurement efficiency and accuracy are improved; meanwhile, the measuring device provided by the invention eliminates the system errors introduced by each component by arranging the receiving reference link and the receiving measuring link and utilizing the calibration piece, thereby further improving the measuring accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
one aspect of the present invention provides a terahertz single-port spatial network reflection coefficient measuring apparatus, including:
the device comprises a narrow-linewidth laser, a tunable laser, first to fifth 1 multiplied by 2 optical couplers, an optical phase controller, a reference signal generator, a photon mixing transmitting antenna, a photon mixing receiving reference antenna, a photon mixing receiving measuring antenna, an isolator, a first terahertz space beam splitter, a second terahertz space beam splitter, a first phase-locked amplifier, a second phase-locked amplifier, a data acquisition module and a measuring reference surface;
wherein the content of the first and second substances,
the narrow-linewidth laser is used for generating a laser signal with fixed frequency and outputting the laser signal with the fixed frequency to the first 1 x 2 optical coupler;
the tunable laser is used for generating a laser signal with adjustable frequency and outputting the laser signal with adjustable frequency to the second 1 x 2 optical coupler;
the first 1 x 2 optical coupler is used for dividing the laser signal output by the narrow linewidth laser into two paths of a first laser signal and a second laser signal;
the second 1 x 2 optical coupler is used for dividing the laser signal output by the tunable laser into a third laser signal and a fourth laser signal;
the third 1 × 2 optical coupler is used for receiving the first laser signal and the third laser signal, combining the first laser signal and the third laser signal and synthesizing a detection light signal;
the optical phase controller is used for receiving the fourth laser signal and realizing phase modulation on the fourth laser signal;
the fourth 1 × 2 optical coupler is used for receiving the second laser signal and the phase-modulated fourth laser signal, combining the second laser signal and the phase-modulated fourth laser signal, and synthesizing an excitation light signal;
the fifth 1 × 2 optical coupler is configured to receive the probe optical signal, divide the probe optical signal into two paths, i.e., a first probe optical signal and a second probe optical signal, and output the two paths to the photon mixing reception reference antenna and the photon mixing reception measurement antenna respectively;
the reference signal generator is used for outputting a modulation electric signal of the optical phase controller to the optical phase controller and providing a reference signal for the first phase-locked amplifier and the second phase-locked amplifier;
the photon mixing transmitting antenna is used for receiving the excitation light signal, converting the excitation light signal into a terahertz signal, converting the terahertz signal into a space radiation terahertz signal and outputting the space radiation terahertz signal to the first terahertz space beam splitter;
the first terahertz space beam splitter is used for splitting the space radiation terahertz signal into a first space radiation terahertz signal and a second space radiation terahertz signal, and respectively sending the first space radiation terahertz signal and the second space radiation terahertz signal to the photon mixing receiving reference antenna and the isolator;
the isolator is used for realizing the unidirectional signal transmission between the first terahertz space beam splitter and the second terahertz space beam splitter;
the second terahertz spatial beam splitter is used for receiving a second spatial radiation terahertz signal transmitted by the isolator, transmitting the second spatial radiation terahertz signal to a measurement reference surface provided with a measured single-port spatial network, and then transmitting the second spatial radiation terahertz signal reflected by the measured single-port spatial network to the photon mixing receiving measurement antenna;
the photon frequency mixing receiving reference antenna is used for enabling the first detection light signal and the first space radiation terahertz signal to act, and enabling the first space radiation terahertz signal to be converted into an intermediate frequency in a down-conversion mode to obtain a first intermediate frequency signal;
the photon frequency mixing receiving and measuring antenna is used for enabling the second detection light signal and the reflected second space radiation terahertz signal to act, so that the reflected second space radiation terahertz signal is subjected to down-conversion to an intermediate frequency, and a second intermediate frequency signal is obtained;
the first phase-locked amplifier is used for receiving the first intermediate-frequency signal and obtaining the amplitude and the phase of the reference terahertz signal through phase-locked amplification;
the second lock-in amplifier is used for receiving the second intermediate frequency signal and obtaining the amplitude and the phase of the terahertz signal to be measured through lock-in amplification;
the data acquisition module is used for acquiring amplitude and phase information obtained by the first phase-locked amplifier and the second phase-locked amplifier and completing calibration or calculation of the device according to the information to obtain a reflection coefficient of the measured single-port space network.
In a specific embodiment, the device further comprises a calibration piece, and the calibration piece can be used for calibrating the device when being arranged at a measurement reference plane where the measured single-port space network is located.
In a specific embodiment, the output end of the narrow linewidth laser is connected with the combining end of the first 1 × 2 optical coupler through an optical fiber;
the output end of the tunable laser is connected with the combining end of the second 1 x 2 optical coupler through an optical fiber;
the first shunt end of the first 1 × 2 optical coupler is connected with the first shunt end of the third 1 × 2 optical coupler through an optical fiber;
the second shunt end of the first 1 x 2 optical coupler is connected with the first shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the first shunt end of the second 1 x 2 optical coupler is connected with the second shunt end of the third 1 x 2 optical coupler through an optical fiber;
the second shunt end of the second 1 × 2 optical coupler is connected with the optical input end of the optical phase controller through an optical fiber;
the output end of the light phase controller is connected with the second shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the combining end of the fourth 1 x 2 optical coupler is connected with the optical input end of the photon mixing transmitting antenna through an optical fiber;
the combining end of the third 1 × 2 optical coupler is connected with the combining end of the fifth 1 × 2 optical coupler through an optical fiber;
the first shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving reference antenna through an optical fiber;
the second shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving and measuring antenna through an optical fiber;
the electrical output end of the photon mixing receiving reference antenna is connected with the signal input end of the first phase-locked amplifier through a radio frequency coaxial cable;
the signal output end of the first phase-locked amplifier is connected with the first input channel of the data acquisition module through a radio frequency coaxial cable;
the electrical output end of the photon frequency mixing receiving and measuring antenna is connected with the signal input end of the second lock-in amplifier through a radio frequency coaxial cable;
the signal output end of the second lock-in amplifier is connected with the second input channel of the data acquisition module through a radio frequency coaxial cable;
the signal output end of the reference signal generator is connected with the electrical input end of the optical phase controller through a radio frequency coaxial cable;
and the synchronous signal output end of the reference signal generator is respectively connected with the reference signal input end of the first phase-locked amplifier and the reference signal input end of the second phase-locked amplifier through a radio frequency coaxial cable.
In another aspect, the present invention provides a method for measuring a reflection coefficient of a terahertz single-port spatial network according to the above apparatus, where the method includes the following steps:
s101: narrow linewidth laser generates central wavelength lambda0The tunable laser generates a laser signal having a center wavelength λTThe laser signal of (1);
s102: laser signals generated by the narrow-linewidth laser are divided into first laser signals and second laser signals after passing through a first 1 x 2 optical coupler; laser signals generated by the tunable laser are divided into a third laser signal and a fourth laser signal after passing through a second 1 x 2 optical coupler; the fourth laser signal passes through the optical phase controller and then is combined with the second laser signal in a fourth 1 x 2 optical coupler to form an excitation optical signal, and the excitation optical signal enters a photon mixing transmitting antenna; the first laser signal and the third laser signal are synthesized into a probe light signal in a third 1 x 2 optical coupler and enter a fifth 1 x 2 optical coupler;
s103: the exciting light signal is mixed on the photon mixing transmitting antenna to generate the frequency of
The photon mixing transmitting antenna converts the terahertz signal into a space radiation terahertz signal and outputs the space radiation terahertz signal to the first terahertz space beam splitter; the fifth 1 x 2 optical coupler divides the detection light signal into a first detection light signal and a second detection light signal and respectively outputs the first detection light signal and the second detection light signal to the photon frequency mixing receiving reference antenna and the photon frequency mixing receiving measuring antenna;
s104: the first terahertz spatial beam splitter divides a received spatial radiation terahertz signal into a first spatial radiation terahertz signal and a second spatial radiation terahertz signal, the first spatial radiation terahertz signal enters a photon mixing receiving reference antenna to act with the first detection light signal, so that the first spatial radiation terahertz signal is down-converted to an intermediate frequency to obtain a first intermediate frequency signal, the photon mixing receiving reference antenna outputs the first intermediate frequency signal to a first phase-locked amplifier, the first phase-locked amplifier obtains the first intermediate frequency signal, then the amplitude and the phase of the reference terahertz signal are obtained through phase-locked amplification, and the amplitude and the phase of the reference terahertz signal are sent to a data acquisition module;
s105: the second space radiation terahertz signal reaches a measurement reference surface provided with a calibration piece after passing through an isolator and a second terahertz space beam splitter, the second space radiation terahertz signal is reflected by the measurement reference surface provided with the calibration piece and then enters a photon mixing receiving and measuring antenna through the second terahertz space beam splitter, the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is acted with the second detection light signal on the photon mixing receiving and measuring antenna, so that the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is down-converted to an intermediate frequency to obtain a calibration intermediate frequency signal, then the photon mixing receiving and measuring antenna outputs the calibration intermediate frequency signal to a second lock-in amplifier, and the second lock-in amplifier obtains the calibration intermediate frequency signal and then obtains the amplitude and the phase of the calibration terahertz signal through lock-in amplification, sending the amplitude and the phase of the calibration terahertz signal to a data acquisition module;
s106: the data acquisition module finishes the calibration of the terahertz single-port space network reflection coefficient measuring device according to the acquired amplitude and phase of the reference terahertz signal and the amplitude and phase information of the calibration terahertz signal;
s107: removing the calibration piece from the measurement reference surface, arranging the measured single-port space network on the measurement reference surface, enabling the second space radiation terahertz signal to pass through an isolator and a second terahertz space beam splitter and then reach the measurement reference surface provided with the measured single-port space network, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to enter a photon mixing receiving and measuring antenna through a second terahertz space beam splitter after being reflected, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to act with a second detection optical signal on the photon mixing receiving and measuring antenna, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to be down-converted to an intermediate frequency to obtain a second intermediate frequency signal, and then enabling the photon mixing receiving and measuring antenna to output the second intermediate frequency signal to a second phase-locked amplifier, the second lock-in amplifier obtains the second intermediate frequency signal, then obtains the amplitude and the phase of the measuring terahertz signal through lock-in amplification, and sends the amplitude and the phase of the measuring terahertz signal to the data acquisition module;
s108: the data acquisition module calculates the frequency of the measured single-port space network according to the amplitude and the phase of the acquired reference terahertz signal and the amplitude and phase information of the measured terahertz signal
The reflection coefficient of (d);
where c is the speed of light.
In a specific embodiment, the method further comprises:
varying the center wavelength λ of a laser signal generated by the tunable laserT；
And repeating the steps S102-S108 to obtain the reflection coefficients of the tested single-port space network at different frequencies.
The invention has the following beneficial effects:
the terahertz signal with the frequency range of more than 3THz can be generated by the terahertz single-port space network reflection coefficient measuring device and the method, so that the measuring frequency exceeds 3THz, and the measuring frequency range is expanded; related modules and devices do not need to be replaced in the full-frequency measurement working process, so that the measurement efficiency and accuracy are improved; meanwhile, the measuring device provided by the invention eliminates the system errors introduced by each component by arranging the receiving reference link and the receiving measuring link and utilizing the calibration piece, thereby further improving the measuring accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a schematic structural diagram of a terahertz single-port spatial network reflection coefficient measurement apparatus according to an embodiment of the present invention.
Fig. 2 shows a flowchart of a terahertz single-port spatial network reflection coefficient measurement method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. The present invention will be described in detail with reference to specific examples, but the present invention is not limited to these examples. Variations and modifications may be made by those skilled in the art without departing from the principles of the invention and should be considered within the scope of the invention.
In one aspect, this embodiment provides a terahertz single-port spatial network reflection coefficient measuring device, as shown in fig. 1, the device includes:
the device comprises a narrow-linewidth laser, a tunable laser, first to fifth 1 multiplied by 2 optical couplers, an optical phase controller, a reference signal generator, a photon mixing transmitting antenna, a photon mixing receiving reference antenna, a photon mixing receiving measuring antenna, an isolator, a first terahertz space beam splitter, a second terahertz space beam splitter, a first phase-locked amplifier, a second phase-locked amplifier, a data acquisition module, a measuring reference surface and a calibration piece;
the output end of the narrow-linewidth laser is connected with the combining end of the first 1 x 2 optical coupler through an optical fiber;
the output end of the tunable laser is connected with the combining end of the second 1 x 2 optical coupler through an optical fiber;
the first shunt end of the first 1 × 2 optical coupler is connected with the first shunt end of the third 1 × 2 optical coupler through an optical fiber;
the second shunt end of the first 1 x 2 optical coupler is connected with the first shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the first shunt end of the second 1 x 2 optical coupler is connected with the second shunt end of the third 1 x 2 optical coupler through an optical fiber;
the second shunt end of the second 1 × 2 optical coupler is connected with the optical input end of the optical phase controller through an optical fiber;
the output end of the light phase controller is connected with the second shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the combining end of the fourth 1 x 2 optical coupler is connected with the optical input end of the photon mixing transmitting antenna through an optical fiber;
the combining end of the third 1 × 2 optical coupler is connected with the combining end of the fifth 1 × 2 optical coupler through an optical fiber;
the first shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving reference antenna through an optical fiber;
the second shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving and measuring antenna through an optical fiber;
the electrical output end of the photon mixing receiving reference antenna is connected with the signal input end of the first phase-locked amplifier through a radio frequency coaxial cable;
the signal output end of the first phase-locked amplifier is connected with the first input channel of the data acquisition module through a radio frequency coaxial cable;
the electrical output end of the photon frequency mixing receiving and measuring antenna is connected with the signal input end of the second lock-in amplifier through a radio frequency coaxial cable;
the signal output end of the second lock-in amplifier is connected with the second input channel of the data acquisition module through a radio frequency coaxial cable;
the signal output end of the reference signal generator is connected with the electrical input end of the optical phase controller through a radio frequency coaxial cable;
and the synchronous signal output end of the reference signal generator is respectively connected with the reference signal input end of the first phase-locked amplifier and the reference signal input end of the second phase-locked amplifier through a radio frequency coaxial cable.
The first terahertz spatial beam splitter, the isolator and the second terahertz spatial beam splitter receive and transmit signals through air-interface radiation;
wherein the content of the first and second substances,
the narrow-linewidth laser is used for generating a laser signal with fixed frequency and outputting the laser signal with the fixed frequency to the first 1 x 2 optical coupler;
the tunable laser is used for generating a laser signal with adjustable frequency and outputting the laser signal with adjustable frequency to the second 1 x 2 optical coupler; the frequency-adjustable laser signal is mixed with a fixed-frequency laser signal generated by the narrow-linewidth laser, so that generation and measurement of terahertz signals with different frequencies can be realized;
the first 1 x 2 optical coupler is used for dividing the laser signal output by the narrow linewidth laser into two paths of a first laser signal and a second laser signal;
the second 1 x 2 optical coupler is used for dividing the laser signal output by the tunable laser into a third laser signal and a fourth laser signal;
the third 1 × 2 optical coupler is used for receiving the first laser signal and the third laser signal, combining the first laser signal and the third laser signal and synthesizing a detection light signal;
the light phase controller is used for receiving the fourth laser signal and realizing phase modulation on the fourth laser signal so as to realize phase modulation on the output terahertz signal;
the fourth 1 × 2 optical coupler is used for receiving the second laser signal and the phase-modulated fourth laser signal, combining the second laser signal and the phase-modulated fourth laser signal, and synthesizing an excitation light signal;
the fifth 1 × 2 optical coupler is configured to receive the probe optical signal, divide the probe optical signal into two paths, i.e., a first probe optical signal and a second probe optical signal, and output the two paths to the photon mixing reception reference antenna and the photon mixing reception measurement antenna respectively;
the reference signal generator is used for outputting a modulation electric signal of the optical phase controller to the optical phase controller, providing a reference signal for the first phase-locked amplifier and the second phase-locked amplifier, and realizing the phase-locked amplification measurement of a weak signal;
the photon mixing transmitting antenna is used for receiving the excitation light signal, converting the excitation light signal into a terahertz signal, converting the terahertz signal into a space radiation terahertz signal, and outputting the space radiation terahertz signal to the first terahertz space beam splitter through air interface radiation;
the first terahertz space beam splitter is used for splitting the space radiation terahertz signal into a first space radiation terahertz signal and a second space radiation terahertz signal, and respectively sending the first space radiation terahertz signal and the second space radiation terahertz signal to the photon mixing receiving reference antenna and the isolator; wherein the first space radiates a terahertz signal as a reference terahertz signal;
the isolator is used for realizing the unidirectional signal transmission between the first terahertz space beam splitter and the second terahertz space beam splitter;
the second terahertz spatial beam splitter is used for receiving a second spatial radiation terahertz signal transmitted by the isolator, transmitting the second spatial radiation terahertz signal to a measurement reference surface provided with a measured single-port spatial network, and then transmitting the second spatial radiation terahertz signal reflected by the measured single-port spatial network to the photon mixing receiving measurement antenna; the second space radiation terahertz signal reflected by the measured single-port space network is used as a measurement terahertz signal;
the photon frequency mixing receiving reference antenna is used for enabling the first detection light signal and the first space radiation terahertz signal to act, and enabling the first space radiation terahertz signal to be converted into an intermediate frequency in a down-conversion mode to obtain a first intermediate frequency signal;
the photon frequency mixing receiving and measuring antenna is used for enabling the second detection light signal and the reflected second space radiation terahertz signal to act, so that the reflected second space radiation terahertz signal is subjected to down-conversion to an intermediate frequency, and a second intermediate frequency signal is obtained;
the first phase-locked amplifier is used for receiving the first intermediate-frequency signal and obtaining the amplitude and the phase of the reference terahertz signal through phase-locked amplification;
the second lock-in amplifier is used for receiving the second intermediate frequency signal and obtaining the amplitude and the phase of the terahertz signal to be measured through lock-in amplification;
the data acquisition module is used for acquiring amplitude and phase information obtained by the first phase-locked amplifier and the second phase-locked amplifier and completing calibration or calculation of the device according to the information to obtain a reflection coefficient of the tested single-port space network;
when the calibration piece is arranged on the measurement reference surface where the measured single-port space network is located, the calibration piece can be used for calibrating the terahertz single-port space network reflection coefficient measurement device, and accurate measurement of the reflection coefficient is achieved.
Another aspect of the present embodiment provides a method for measuring a reflection coefficient of a terahertz single-port spatial network by using the above apparatus, as shown in fig. 2, the method includes the following steps:
s101: narrow linewidth laser generates central wavelength lambda0The tunable laser generates a laser signal having a center wavelength λTThe laser signal of (1);
s102: laser signals generated by the narrow-linewidth laser are divided into first laser signals and second laser signals after passing through a first 1 x 2 optical coupler; laser signals generated by the tunable laser are divided into a third laser signal and a fourth laser signal after passing through a second 1 x 2 optical coupler; the fourth laser signal passes through the optical phase controller and then is combined with the second laser signal in a fourth 1 x 2 optical coupler to form an excitation optical signal, and the excitation optical signal enters a photon mixing transmitting antenna; the first laser signal and the third laser signal are synthesized into a probe light signal in a third 1 x 2 optical coupler and enter a fifth 1 x 2 optical coupler;
s103: the exciting light signal is mixed on the photon mixing transmitting antenna to generate the frequency of
The photon mixing transmitting antenna converts the terahertz signal into a space radiation terahertz signal and outputs the space radiation terahertz signal to the first terahertz space beam splitter; the fifth 1 x 2 optical coupler divides the detection light signal into a first detection light signal and a second detection light signal and respectively outputs the first detection light signal and the second detection light signal to the photon frequency mixing receiving reference antenna and the photon frequency mixing receiving measuring antenna;
s104: the first terahertz spatial beam splitter divides a received spatial radiation terahertz signal into a first spatial radiation terahertz signal and a second spatial radiation terahertz signal, the first spatial radiation terahertz signal enters a photon mixing receiving reference antenna to act with the first detection light signal, so that the first spatial radiation terahertz signal is down-converted to an intermediate frequency to obtain a first intermediate frequency signal, the photon mixing receiving reference antenna outputs the first intermediate frequency signal to a first phase-locked amplifier, the first phase-locked amplifier obtains the first intermediate frequency signal, then the amplitude and the phase of the reference terahertz signal are obtained through phase-locked amplification, and the amplitude and the phase of the reference terahertz signal are sent to a data acquisition module;
s105: the second space radiation terahertz signal reaches a measurement reference surface provided with a calibration piece after passing through an isolator and a second terahertz space beam splitter, the second space radiation terahertz signal is reflected by the measurement reference surface provided with the calibration piece and then enters a photon mixing receiving and measuring antenna through the second terahertz space beam splitter, the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is acted with the second detection light signal on the photon mixing receiving and measuring antenna, so that the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is down-converted to an intermediate frequency to obtain a calibration intermediate frequency signal, then the photon mixing receiving and measuring antenna outputs the calibration intermediate frequency signal to a second lock-in amplifier, and the second lock-in amplifier obtains the calibration intermediate frequency signal and then obtains the amplitude and the phase of the calibration terahertz signal through lock-in amplification, sending the amplitude and the phase of the calibration terahertz signal to a data acquisition module;
s106: the data acquisition module finishes the calibration of the terahertz single-port space network reflection coefficient measuring device according to the acquired amplitude and phase of the reference terahertz signal and the amplitude and phase information of the calibration terahertz signal, and eliminates the influence of system errors;
s107: removing the calibration piece from the measurement reference surface, arranging the measured single-port space network on the measurement reference surface, enabling the second space radiation terahertz signal to pass through an isolator and a second terahertz space beam splitter and then reach the measurement reference surface provided with the measured single-port space network, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to enter a photon mixing receiving and measuring antenna through a second terahertz space beam splitter after being reflected, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to act with a second detection optical signal on the photon mixing receiving and measuring antenna, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to be down-converted to an intermediate frequency to obtain a second intermediate frequency signal, and then enabling the photon mixing receiving and measuring antenna to output the second intermediate frequency signal to a second phase-locked amplifier, the second lock-in amplifier obtains the second intermediate frequency signal, then obtains the amplitude and the phase of the measuring terahertz signal through lock-in amplification, and sends the amplitude and the phase of the measuring terahertz signal to the data acquisition module;
s108: the data acquisition module calculates to obtain the measured terahertz signal according to the amplitude and the phase of the acquired reference terahertz signal and the amplitude and phase information of the measured terahertz signalSingle port spatial network in frequency
The reflection coefficient of (d);
where c is the speed of light.
The method further comprises the following steps:
varying the center wavelength λ of a laser signal generated by the tunable laserT；
And repeating the steps S102-S108 to obtain the reflection coefficients of the tested single-port space network at different frequencies.
The terahertz signal with the frequency range of more than 3THz can be generated by the terahertz single-port space network reflection coefficient measuring device and the method provided by the embodiment, so that the measuring frequency exceeds 3THz and is far higher than the frequency of the terahertz signal generated by a traditional network analyzer by adopting a pure solid-state electronics technology, and the measuring frequency range is expanded; compared with the traditional measuring device, the measuring device provided by the embodiment does not need to frequently replace related modules such as a frequency expansion module and devices like the traditional measuring device in the full-frequency measuring working process, so that the measuring efficiency is improved; meanwhile, the measuring device provided by the embodiment eliminates the system errors introduced by each component by arranging the receiving reference link and the receiving measuring link and utilizing the calibration piece, so that the measuring accuracy is further improved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (5)
1. A terahertz single-port space network reflection coefficient measuring device is characterized by comprising:
the device comprises a narrow-linewidth laser, a tunable laser, first to fifth 1 multiplied by 2 optical couplers, an optical phase controller, a reference signal generator, a photon mixing transmitting antenna, a photon mixing receiving reference antenna, a photon mixing receiving measuring antenna, an isolator, a first terahertz space beam splitter, a second terahertz space beam splitter, a first phase-locked amplifier, a second phase-locked amplifier, a data acquisition module and a measuring reference surface;
wherein the content of the first and second substances,
the narrow-linewidth laser is used for generating a laser signal with fixed frequency and outputting the laser signal with the fixed frequency to the first 1 x 2 optical coupler;
the tunable laser is used for generating a laser signal with adjustable frequency and outputting the laser signal with adjustable frequency to the second 1 x 2 optical coupler;
the first 1 x 2 optical coupler is used for dividing the laser signal output by the narrow linewidth laser into two paths of a first laser signal and a second laser signal;
the second 1 x 2 optical coupler is used for dividing the laser signal output by the tunable laser into a third laser signal and a fourth laser signal;
the third 1 × 2 optical coupler is used for receiving the first laser signal and the third laser signal, combining the first laser signal and the third laser signal and synthesizing a detection light signal;
the optical phase controller is used for receiving the fourth laser signal and realizing phase modulation on the fourth laser signal;
the fourth 1 × 2 optical coupler is used for receiving the second laser signal and the phase-modulated fourth laser signal, combining the second laser signal and the phase-modulated fourth laser signal, and synthesizing an excitation light signal;
the fifth 1 × 2 optical coupler is configured to receive the probe optical signal, divide the probe optical signal into two paths, i.e., a first probe optical signal and a second probe optical signal, and output the two paths to the photon mixing reception reference antenna and the photon mixing reception measurement antenna respectively;
the reference signal generator is used for outputting a modulation electric signal of the optical phase controller to the optical phase controller and providing a reference signal for the first phase-locked amplifier and the second phase-locked amplifier;
the photon mixing transmitting antenna is used for receiving the excitation light signal, converting the excitation light signal into a terahertz signal, converting the terahertz signal into a space radiation terahertz signal and outputting the space radiation terahertz signal to the first terahertz space beam splitter;
the first terahertz space beam splitter is used for splitting the space radiation terahertz signal into a first space radiation terahertz signal and a second space radiation terahertz signal, and respectively sending the first space radiation terahertz signal and the second space radiation terahertz signal to the photon mixing receiving reference antenna and the isolator;
the isolator is used for realizing the unidirectional signal transmission between the first terahertz space beam splitter and the second terahertz space beam splitter;
the second terahertz spatial beam splitter is used for receiving a second spatial radiation terahertz signal transmitted by the isolator, transmitting the second spatial radiation terahertz signal to a measurement reference surface provided with a measured single-port spatial network, and then transmitting the second spatial radiation terahertz signal reflected by the measured single-port spatial network to the photon mixing receiving measurement antenna;
the photon frequency mixing receiving reference antenna is used for enabling the first detection light signal and the first space radiation terahertz signal to act, and enabling the first space radiation terahertz signal to be converted into an intermediate frequency in a down-conversion mode to obtain a first intermediate frequency signal;
the photon frequency mixing receiving and measuring antenna is used for enabling the second detection light signal and the reflected second space radiation terahertz signal to act, so that the reflected second space radiation terahertz signal is subjected to down-conversion to an intermediate frequency, and a second intermediate frequency signal is obtained;
the first phase-locked amplifier is used for receiving the first intermediate-frequency signal and obtaining the amplitude and the phase of the reference terahertz signal through phase-locked amplification;
the second lock-in amplifier is used for receiving the second intermediate frequency signal and obtaining the amplitude and the phase of the terahertz signal to be measured through lock-in amplification;
the data acquisition module is used for acquiring amplitude and phase information obtained by the first phase-locked amplifier and the second phase-locked amplifier and completing calibration or calculation of the device according to the information to obtain a reflection coefficient of the measured single-port space network.
2. The device according to claim 1, further comprising a calibration member, wherein the calibration member is arranged at a measurement reference plane where the measured single-port space network is located, and can be used for calibrating the device.
3. The apparatus of claim 1, wherein the output end of the narrow linewidth laser is connected to the combining end of the first 1 x 2 optical coupler by an optical fiber;
the output end of the tunable laser is connected with the combining end of the second 1 x 2 optical coupler through an optical fiber;
the first shunt end of the first 1 × 2 optical coupler is connected with the first shunt end of the third 1 × 2 optical coupler through an optical fiber;
the second shunt end of the first 1 x 2 optical coupler is connected with the first shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the first shunt end of the second 1 x 2 optical coupler is connected with the second shunt end of the third 1 x 2 optical coupler through an optical fiber;
the second shunt end of the second 1 × 2 optical coupler is connected with the optical input end of the optical phase controller through an optical fiber;
the output end of the light phase controller is connected with the second shunt end of the fourth 1 x 2 optical coupler through an optical fiber;
the combining end of the fourth 1 x 2 optical coupler is connected with the optical input end of the photon mixing transmitting antenna through an optical fiber;
the combining end of the third 1 × 2 optical coupler is connected with the combining end of the fifth 1 × 2 optical coupler through an optical fiber;
the first shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving reference antenna through an optical fiber;
the second shunt end of the fifth 1 x 2 optical coupler is connected with the optical input end of the photon mixing receiving and measuring antenna through an optical fiber;
the electrical output end of the photon mixing receiving reference antenna is connected with the signal input end of the first phase-locked amplifier through a radio frequency coaxial cable;
the signal output end of the first phase-locked amplifier is connected with the first input channel of the data acquisition module through a radio frequency coaxial cable;
the electrical output end of the photon frequency mixing receiving and measuring antenna is connected with the signal input end of the second lock-in amplifier through a radio frequency coaxial cable;
the signal output end of the second lock-in amplifier is connected with the second input channel of the data acquisition module through a radio frequency coaxial cable;
the signal output end of the reference signal generator is connected with the electrical input end of the optical phase controller through a radio frequency coaxial cable;
and the synchronous signal output end of the reference signal generator is respectively connected with the reference signal input end of the first phase-locked amplifier and the reference signal input end of the second phase-locked amplifier through a radio frequency coaxial cable.
4. A terahertz single-port spatial network reflection coefficient measurement method of the apparatus according to any one of claims 1 to 3, characterized in that the method comprises the following steps:
s101: narrow linewidth laser generates central wavelength lambda0The tunable laser generates a laser signal having a center wavelength λTThe laser signal of (1);
s102: laser signals generated by the narrow-linewidth laser are divided into first laser signals and second laser signals after passing through a first 1 x 2 optical coupler; laser signals generated by the tunable laser are divided into a third laser signal and a fourth laser signal after passing through a second 1 x 2 optical coupler; the fourth laser signal passes through the optical phase controller and then is combined with the second laser signal in a fourth 1 x 2 optical coupler to form an excitation optical signal, and the excitation optical signal enters a photon mixing transmitting antenna; the first laser signal and the third laser signal are synthesized into a probe light signal in a third 1 x 2 optical coupler and enter a fifth 1 x 2 optical coupler;
s103: the exciting light signal is mixed on the photon mixing transmitting antenna to generate the frequency of
The photon mixing transmitting antenna converts the terahertz signal into a space radiation terahertz signal and outputs the space radiation terahertz signal to the first terahertz space beam splitter; the fifth 1 x 2 optical coupler divides the detection light signal into a first detection light signal and a second detection light signal and respectively outputs the first detection light signal and the second detection light signal to the photon frequency mixing receiving reference antenna and the photon frequency mixing receiving measuring antenna;
s104: the first terahertz spatial beam splitter divides a received spatial radiation terahertz signal into a first spatial radiation terahertz signal and a second spatial radiation terahertz signal, the first spatial radiation terahertz signal enters a photon mixing receiving reference antenna to act with the first detection light signal, so that the first spatial radiation terahertz signal is down-converted to an intermediate frequency to obtain a first intermediate frequency signal, the photon mixing receiving reference antenna outputs the first intermediate frequency signal to a first phase-locked amplifier, the first phase-locked amplifier obtains the first intermediate frequency signal, then the amplitude and the phase of the reference terahertz signal are obtained through phase-locked amplification, and the amplitude and the phase of the reference terahertz signal are sent to a data acquisition module;
s105: the second space radiation terahertz signal reaches a measurement reference surface provided with a calibration piece after passing through an isolator and a second terahertz space beam splitter, the second space radiation terahertz signal is reflected by the measurement reference surface provided with the calibration piece and then enters a photon mixing receiving and measuring antenna through the second terahertz space beam splitter, the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is acted with the second detection light signal on the photon mixing receiving and measuring antenna, so that the second space radiation terahertz signal reflected by the measurement reference surface provided with the calibration piece is down-converted to an intermediate frequency to obtain a calibration intermediate frequency signal, then the photon mixing receiving and measuring antenna outputs the calibration intermediate frequency signal to a second lock-in amplifier, and the second lock-in amplifier obtains the calibration intermediate frequency signal and then obtains the amplitude and the phase of the calibration terahertz signal through lock-in amplification, sending the amplitude and the phase of the calibration terahertz signal to a data acquisition module;
s106: the data acquisition module finishes the calibration of the terahertz single-port space network reflection coefficient measuring device according to the acquired amplitude and phase of the reference terahertz signal and the amplitude and phase information of the calibration terahertz signal;
s107: removing the calibration piece from the measurement reference surface, arranging the measured single-port space network on the measurement reference surface, enabling the second space radiation terahertz signal to pass through an isolator and a second terahertz space beam splitter and then reach the measurement reference surface provided with the measured single-port space network, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to enter a photon mixing receiving and measuring antenna through a second terahertz space beam splitter after being reflected, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to act with a second detection optical signal on the photon mixing receiving and measuring antenna, enabling the second space radiation terahertz signal reflected by the measurement reference surface provided with the measured single-port space network to be down-converted to an intermediate frequency to obtain a second intermediate frequency signal, and then enabling the photon mixing receiving and measuring antenna to output the second intermediate frequency signal to a second phase-locked amplifier, the second lock-in amplifier obtains the second intermediate frequency signal, then obtains the amplitude and the phase of the measuring terahertz signal through lock-in amplification, and sends the amplitude and the phase of the measuring terahertz signal to the data acquisition module;
s108: the data acquisition module calculates the frequency of the measured single-port space network according to the amplitude and the phase of the acquired reference terahertz signal and the amplitude and phase information of the measured terahertz signal
The reflection coefficient of (d);
where c is the speed of light.
5. The method of claim 4, further comprising:
varying the center wavelength λ of a laser signal generated by the tunable laserT；
And repeating the steps S102-S108 to obtain the reflection coefficients of the tested single-port space network at different frequencies.
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