CN110912607B - Multi-channel radio frequency optical transmission signal amplitude and phase measuring device and measuring and verifying method - Google Patents
Multi-channel radio frequency optical transmission signal amplitude and phase measuring device and measuring and verifying method Download PDFInfo
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Abstract
The invention discloses a multipath radio frequency optical transmission signal amplitude and phase measuring device which is characterized by comprising an optical selection module, an optical emission module connected with the optical selection module, a measuring module and a group of optical receiving modules with consistent specifications, wherein the optical emission module and the measuring module are electrically connected with a frequency spectrograph and a vector network analyzer during measurement verification and calibration. The device has the advantages of low cost, convenient networking, flexible use and high measurement speed. The invention also discloses a measuring and verifying method of the multipath radio frequency optical transmission signal amplitude and phase measuring device, which has the advantages of simple operation, high measuring precision, improved working efficiency and accuracy verification and calibration.
Description
Technical Field
The invention relates to an optical communication technology, in particular to a multipath radio frequency optical transmission signal amplitude and phase measuring device and a measuring and verifying method.
Technical Field
Currently, many detection radars are required to be built in mountains, grasslands or rare areas with relatively good electromagnetic environments, and the transmission of radar signals basically uses optical cable transmission, and the consistency of the amplitude and the phase of the signals transmitted to signal terminals is ensured. In order to ensure consistency, the optical cable is ensured to be as long as possible, but signals transmitted to each terminal can be distorted due to thermal expansion and contraction of the optical fiber, wind disturbance and the like along with the change of the external environment. If a plurality of optical paths and a plurality of radar networks work cooperatively, signal distortion can greatly reduce the performance of the radar networks, which requires real-time monitoring of signals transmitted to the terminals.
In order to ensure the communication quality of short-wave communication, the high-altitude ionosphere needs to be detected, and several or even tens of short-wave antennas need to be used for simultaneously signaling to the high-altitude ionosphere and then reflected back for analysis. The signals transmitted by these antennas must be in phase with the same amplitude and the distance between the antennas varies from a few hundred meters to a few kilometers apart. At this time, it is necessary to monitor and adjust the phase difference of the signal amplitudes of the antenna terminals.
In some radar applications, the transmitting end and the receiving end are provided with a plurality of antennas, and the distance between the antennas is different from hundreds of meters to kilometers. The signals sent by the transmitting antennas also have the requirement of amplitude-phase consistency; the receiving end usually uses small signals with the same amplitude and phase to correct in order to ensure the consistency of each receiving channel, and the transmission medium between the signals is usually an optical cable.
It is therefore necessary to design a system that can be embedded to measure the amplitude consistency of the far-end signal in real time.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a multi-channel radio frequency optical transmission signal amplitude and phase measuring device and a measuring and verifying method. The device has the advantages of low cost, convenient networking, flexible use and high measurement speed. The method is simple to operate, high in measurement accuracy, capable of improving working efficiency and capable of achieving accuracy verification and calibration.
The technical scheme for realizing the aim of the invention is as follows:
The utility model provides a multichannel radio frequency optical transmission signal amplitude and phase measuring device, includes light selection module and the light emitting module, the measuring module of being connected with light selection module and the light receiving module group that a set of specification is unanimous, when carrying out system self measurement verification and calibration, light emitting module and measuring module all are electric connection spectrum appearance and vector network analyzer, and the spectrum appearance is used for measuring range, and vector network analyzer is used for measuring the phase place.
The optical selection module realizes distribution and selection of optical paths, the type of an interface of the optical selection module is DLC-A-01, the optical selection module comprises se:Sub>A 1:N optical branching device, se:Sub>A group of wavelength division multiplexer groups with the same specification, se:Sub>A pull cone type 1:2 optical branching device and an N:1 type MEMS optical switch which are sequentially connected, wherein the wavelength division multiplexer groups are provided with the wavelength division multiplexer 1 to the wavelength division multiplexer N, N is se:Sub>A natural integer, the 1:N optical branching device is connected with the optical emission module, optical signals sent by the optical emission module are divided into N paths of optical outputs, after the 1:N optical branching device receives the optical signals sent by the optical emission module, the N paths of optical signals are divided into N paths of emission ports of the wavelength division multiplexer groups, the N paths of optical signals transmitted by the N paths of optical receiving module are connected with 1310nm receiving ports of the wavelength division multiplexer groups, the first path of the wavelength division multiplexer 1 is output to the pull cone type 1:2 optical branching device, one path of the output of the pull cone type 1:2 optical branching device is used as se:Sub>A reference signal connection measurement module, the other paths of output of the pull cone type 1:2 optical branching device are correspondingly connected with the N paths of MEMS optical switch, and the other paths of output ports of the N optical switch are connected with the N-type 1:1 optical switch, and the N-type optical switch is used as se:Sub>A measurement module, and the N-type optical switch is connected with the other optical switch, and the N-type optical switch is connected with the optical switch.
The wavelength division multiplexer has a transmission wavelength of 1550nm and a reception wavelength of 1310nm.
The wavelength of the N-type 1 MEMS optical switch is 1310nm.
The optical power module is characterized in that an electrical input interface of the optical power module is of an SMA-KFK-1 type, an output optical interface of the optical power module is of an FC-A-03 type, an optical power unit consisting of se:Sub>A high-power laser is arranged, radio frequency electric signals can be converted into optical signals to be output, the wavelength of the output optical signals is 1550nm, the optical power is 10dBm, and the output optical signals are connected with se:Sub>A 1:N optical splitter in the optical selection module.
The optical receiving module group is provided with optical receiving modules 1 to N, wherein N is se:Sub>A natural integer, the electric output interface model of each optical receiving module is SMA-KFK-1, the electric output interface model of each optical receiving module is FC-A-03, the optical receiving module group is provided with se:Sub>A wavelength division multiplexing unit with the wavelength of 1550nm and se:Sub>A first optical receiving unit and an optical transmitting unit, the wavelength division multiplexing unit receives 1550nm optical signals and inputs the optical signals to the first optical receiving unit, the first optical receiving unit changes the optical signals into electric signals and inputs the electric signals to the optical transmitting unit, the optical transmitting unit is connected to se:Sub>A 1310nm transmitting end of wavelength division multiplexing through an optical fiber and returns to the wavelength division multiplexer in the optical selecting module.
The measuring module is characterized in that the type of an electric output interface of the measuring module is SMA-KFK-1, the type of an optical interface of the measuring module is FC-A-03, the measuring module realizes amplitude and phase measurement of signals, the measuring module comprises an amplitude and phase measuring unit, se:Sub>A second optical receiving unit, se:Sub>A third optical receiving unit and se:Sub>A reporting unit, wherein the second optical receiving unit, the third optical receiving unit and the third optical receiving unit are connected with the amplitude and phase measuring unit, se:Sub>A 1-minute 2 power divider is arranged in the third optical receiving unit, the two optical receiving units are responsible for converting received two paths of optical signals into electric signals, the second optical receiving unit is connected with se:Sub>A 1:2 optical divider in an optical selection module, se:Sub>A reference optical signal output by the 1:2 optical divider is connected with the second optical receiving unit, the input end of the third optical receiving unit is connected with an N:1 MEMS optical switch in the optical selection module, the output end outputs two paths of electric signals with the same amplitude and phase, one path of electric signals are input into the amplitude and phase measuring unit, the other path of electric signals are connected with se:Sub>A vector network analyzer for measurement calibration, and the amplitude and phase measuring unit outputs one path of signals to the reporting unit for measurement datse:Sub>A reporting.
The measurement of amplitude and phase measurement accuracy is completed by an amplitude and phase measurement unit, the amplitude and phase measurement unit comprises an AD8302 chip and a DSP chip of a model TMS320F2808, the AD8302 is responsible for the detection of the amplitude and phase, the DSP is responsible for the data A/D conversion, control, processing and service transmission, an amplitude and phase detection circuit is mainly realized by the AD8302 chip, and a 12-bit A/D converter is integrated by a DSP processor, and the principle is as follows:
the amplitude-phase detection circuit outputs the measurement result in the form of analog voltage, the output voltage range is 0-1.8V, and the accuracy of the phase measurement output voltage is 10 mV/degree (°); the accuracy of the amplitude measurement output analog voltage is 30mV/dB, the analog voltage output by the previous stage is sampled through 12bitA/D integrated in the DSP, and the measurement accuracy is obtained as follows:
phase accuracy:
amplitude accuracy:
in the actual use process, the phase measurement precision is less than or equal to 0.5 degrees and the amplitude measurement precision is less than or equal to 0.1dB compared with a standard instrument due to the influence of noise and sampling errors.
The measuring module is used for respectively testing the amplitude difference and the phase difference of signals between the channels, and the measurement accuracy and the measurement precision of the measuring module can be obtained by comparing the obtained results with the measurement results of the instrument.
The measuring and verifying method using the multi-channel radio frequency optical transmission signal amplitude-phase measuring device comprises the following steps:
1) Defining test parameters: the test point M0 signal is An optical receiving signal output by a second optical receiving unit, a return optical signal from An optical receiving module 1 in An optical receiving module group is taken as a signal of a measurement reference, the amplitude is marked as A0, the phase is marked as P0, the amplitude and the phase of the optical signal returned by the optical receiving module 1 are invariable all the time, the test point M1 signal and the test point M2 signal are the same-amplitude and same-phase signals formed by the same-channel signal power division of a third optical receiving unit, the signals from the optical receiving module 1 to the optical receiving module N in the optical receiving module group are returned, the signals are output after being switched and selected by An N1 type MEMS optical switch, the test point M3 signal is a radio frequency signal sent by a signal source or a vector network analyzer, the phase is marked as P, the amplitude of the return signals S1 to Sn of the optical receiving module is marked as A1 to An, and the phase is marked as P1 to Pn;
2) The M2 signal is connected into a spectrometer, signals returned by the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from An N1 type MEMS optical switch, the amplitude of the signal returned by the light receiving module N-1 to M2 is set to be An -1, the amplitude of the signal returned by the light receiving module N to M2 is set to be An, the amplitude difference of the two paths of signals measured by the spectrometer is recorded as delta AYQ, delta AYQ =an -1 -An, because the two signals of M2 and M1 are in the same phase, the amplitude of the signal returned by the light receiving module N-1 to M1 is also An -1, the amplitude of the signal returned by the light receiving module N to M2 is also An, the amplitude value returned by the light receiving module 1 to M0 is assumed to be A0, the amplitude difference between the two paths of signals of the M1 signal and the M0 test signal can be measured by using An amplitude-phase measuring module, and the difference between the two paths of signals is recorded as delta A1 for the first time, namely delta A1=An -1 -0; the difference between the second measurement An and A0 is denoted as Δa2, i.e., Δa2=an-A0, and if the difference between the two measurements is Δafx, Δafx=Δa1- Δa2= (An -1-A0)-(An-A0)＝An-1 -An, thus Δ AYQ =Δafx is obtained, which indicates that the measurement result of the amplitude by the amplitude-phase measurement module is consistent with the measurement result of the spectrometer;
3) The M3 signal and the M2 signal are connected into a vector network analyzer, signals returned from the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from an N:1 type MEMS optical switch, the phase of the signal at the M3 position is marked as P, the phase of the signal returned from the light receiving module N-1 to the M2 position is set as Pn -1, the phase of the signal returned from the light receiving module N to the M2 position is set as Pn, and a spectrometer is used for measuring the difference value between Pn -1 and P for the first time and marking as DeltaP 1, namely DeltaP1=Pn -1 -P; the difference between the nth path and P is measured for the second time and is recorded as Δp2, Δp2=pn—p; let the difference between the two measurements be Δ PYQ, then Δ PYQ =Δp1- Δp2= (Pn -1-P)-(Pn-P)＝Pn-1 -Pn, the same applies to the measurement of the phase difference between the M1 signal and the M0 signal by the amplitude phase measurement module, let the phase value of the light receiving module 1 transmitted back to M0 be A0, since the two signals M2 and M1 are in phase with each other, the phase of the signal transmitted back to M1 by the light receiving module N-1 is also Pn -1, the phase of the signal transmitted back to M1 by the light receiving module N is also Pn, the first measurement between Pn -1 and P0 is denoted Δp1, i.e. Δp1=pn -1 -P0, the second measurement between Pn and P0 is denoted Δp2, i.e. Δp2=pnp 0, and the difference between the two measurements is denoted Δpfx, then Δpfx=Δp1- Δp2= (Pn -1-P0)-(Pn-P0)＝Pn-1 -PYQ =pfx) the measured result of the amplitude phase of the light receiving module is identical to that of the frequency spectrum measured by the amplitude phase measurement module.
In the technical scheme, the number of measuring paths can be infinitely added only by changing the paths of the pull cone type 1:2 optical splitter and the N:1 MEMS optical switch in the optical selection module, the automatic measurement between multiple paths of data can be realized by controlling the selection of the optical switch by using the control circuit, and two different signals can be transmitted and received by the optical signal by using a wavelength division multiplexing method, and the two signal paths are identical and are not interfered by external environments, so that the measurement precision and stability are improved.
The technical scheme has the following advantages:
1. the controllable measurement data of the measurement path number is stable: the multi-channel signal can be automatically tested, and can be expanded to infinite multi-channel according to the requirement, so that the multi-channel signal is not interfered by external environment;
2. The amplitude frequency measurement range is wide, and the precision is high;
3. the accuracy of the amplitude and phase measurement result can be calibrated, the measurement accuracy can be verified, and the measurement accuracy can be uploaded to a computer terminal, and the computer terminal can be displayed and controlled.
The device has the advantages of low cost, convenient networking, flexible use and high measurement speed. The method is simple to operate, high in measurement accuracy and capable of improving working efficiency.
Drawings
FIG. 1 is a schematic and structural view of an embodiment;
FIG. 2 is a schematic diagram of an implementation principle of amplitude and phase measurement in an embodiment;
Fig. 3 is a schematic diagram of the method in the embodiment.
Detailed Description
The present invention will now be further illustrated, but not limited, by the following figures and examples.
Examples:
referring to fig. 1, a multi-path radio frequency optical transmission signal amplitude and phase measuring device comprises an optical selection module, an optical emission module connected with the optical selection module, a measuring module and a group of optical receiving modules with consistent specifications, wherein when the system is measured, verified and calibrated, the optical emission module and the measuring module are electrically connected with a frequency spectrograph and a vector network analyzer, the frequency spectrograph is used for measuring amplitude, and the vector network analyzer is used for measuring phase.
The optical selection module realizes distribution and selection of optical paths, the interface model of the optical selection module is DLC-A-01, the optical selection module comprises se:Sub>A 1:N optical branching device, se:Sub>A group of wavelength division multiplexer groups, se:Sub>A pull cone type 1:2 optical branching device and an N:1 type MEMS optical switch which are sequentially connected, in the embodiment, the 1:N optical branching device model is PLC-1-N, wherein the wavelength division multiplexer groups are provided with the wavelength division multiplexer 1 to the wavelength division multiplexer N, N is se:Sub>A natural integer, the 1:N optical branching device is connected with the optical transmission module, optical signals sent by the optical transmission module are divided into N paths of optical outputs, the 1:N optical branching device is connected to 1550 transmitting ports of the wavelength division multiplexer groups after receiving the optical signals sent by the optical transmission module, the optical signals returned by the N paths of the optical reception module are connected to 1310 receiving ports of the wavelength division multiplexer groups, the first path of the optical branching device is output to the pull cone type 1:2 optical branching device and is divided into two paths of optical outputs, one path of the optical outputs is used as se:Sub>A reference signal connection measurement module, the other path of the optical signals are connected with the N path of the N:1 optical branching device corresponding to the output ends of the wavelength division multiplexer groups, and the N path of the optical branching device is connected with the optical switch 1:1 type optical switch, and the optical switch is used as se:Sub>A measurement interface of the optical measurement module, and the optical switch is connected with the optical switch 1.
The wavelength division multiplexer has a transmission wavelength of 1550nm and a reception wavelength of 1310nm.
The wavelength of the N-type 1 MEMS optical switch is 1310nm.
The optical power generation module is characterized in that an electrical input interface model is SMA-KFK-1, an output optical interface model is FC-A-03, an optical power unit consisting of se:Sub>A high-power laser is arranged, in the example, the laser model is DFB-1550-BF, radio-frequency electric signals can be converted into optical signals to be output, the wavelength of the output optical waves is 1550nm, the optical power is 10dBm, and the output optical signals are connected with se:Sub>A 1:N optical splitter in the optical selection module.
The optical receiving module group is provided with optical receiving modules 1 to N, wherein N is se:Sub>A natural integer, the electric output interface model of each optical receiving module is SMA-KFK-1, the electric output interface model of each optical receiving module is FC-A-03, the optical receiving module group is provided with se:Sub>A wavelength division multiplexing unit with the receiving wavelength of 1550nm, se:Sub>A first optical receiving unit and an optical transmitting unit, the first optical receiving unit and the optical transmitting unit are connected with the wavelength division multiplexing unit, the wavelength division multiplexing unit receives 1550nm optical signals and inputs the optical signals to the first optical receiving unit, the first optical receiving unit converts the optical signals into electric signals and inputs the electric signals to the optical transmitting unit, the optical transmitting unit is connected to se:Sub>A 1310nm transmitting end of wavelength division multiplexing through optical fibers and transmits the electric signals back to se:Sub>A wavelength division multiplexer in the optical selecting module, in the example, the PD3000 type optical detector of the first optical receiving unit is se:Sub>A DFB-1310-BF laser, the output wavelength is 1310nm, and the optical power is 5dBm.
The measuring module is characterized in that the type of an electric output interface of the measuring module is SMA-KFK-1, the type of an optical interface of the measuring module is FC-A-03, the measuring module realizes amplitude and phase measurement of signals, the measuring module comprises an amplitude and phase measuring unit, se:Sub>A second optical receiving unit, se:Sub>A third optical receiving unit and se:Sub>A reporting unit, wherein the second optical receiving unit, the third optical receiving unit and the third optical receiving unit are connected with the amplitude and phase measuring unit, se:Sub>A 1-minute 2 power divider is arranged in the third optical receiving unit, the two optical receiving units are responsible for converting received two paths of optical signals into electric signals, the second optical receiving unit is connected with se:Sub>A 1:2 optical divider in an optical selection module, se:Sub>A reference optical signal output by the 1:2 optical divider is connected with the second optical receiving unit, the input end of the third optical receiving unit is connected with an N:1 MEMS optical switch in the optical selection module, the output end outputs two paths of electric signals with the same amplitude and phase, one path of electric signals is input to the amplitude and phase measuring unit, the other path of electric signals are output by the network-minute spectrometer to the measuring unit for measurement calibration, and one path of signals are output to the reporting unit for measurement datse:Sub>A reporting.
In this example, the second optical receiving unit and the third optical receiving unit are PD3000 optical detectors, the reporting unit is composed of a W5500 chip, and is responsible for transmitting the measurement result processed by the DSP to the upper computer in ethernet form, and after the DSP measurement is finished, the measurement data result is transmitted to the functional unit of the upper computer through the ethernet chip, and the upper computer can use the TCP/IP protocol or the UDP protocol to implement uploading through the 10M/100M adaptive network port, and can also implement control over the measurement system through the network port.
The amplitude and phase measurement accuracy is determined by an amplitude and phase measurement unit in a measurement module, the amplitude and phase measurement unit mainly comprises an AD8302 chip and a DSP chip with the model TMS320F2808, the AD8302 is responsible for amplitude and phase detection, the DSP is responsible for data A/D conversion, control, processing and service transmission, a 12-bit A/D converter is integrated in a DSP processor, the main frequency of the chip reaches 200MHz, an SPI communication interface is provided, the analog voltage output by 12-bit A/D sampling measurement is used, the amplitude measurement accuracy theoretically reaches 0.076dB, the phase measurement accuracy theoretically reaches 0.228 degrees, and the principle is shown in fig. 2:
the amplitude-phase detection circuit outputs the measurement result in the form of analog voltage, the output voltage range is 0-1.8V, and the resolution of the phase measurement output voltage is 10 mV/degree (°); the accuracy of the amplitude measurement output analog voltage is 30mV/dB, the analog voltage output by the previous stage is sampled through 12bitA/D integrated in the DSP, and the measurement accuracy is obtained as follows:
phase accuracy:
amplitude accuracy:
in the actual use process, the phase measurement precision is less than or equal to 0.5 degrees and the amplitude measurement precision is less than or equal to 0.1dB compared with a standard instrument due to the influence of noise and sampling errors.
The measuring module is used for respectively testing the amplitude difference and the phase difference of signals between the channels, and the measurement accuracy and the measurement precision of the measuring module can be obtained by comparing the obtained results with the measurement results of the instrument.
Referring to fig. 3, the measuring and verifying method using the above-mentioned multi-channel rf optical transmission signal amplitude-phase measuring device includes the following steps:
1) Defining test parameters: the test point M0 signal is An optical receiving signal output by a second optical receiving unit, a return optical signal from An optical receiving module 1 in An optical receiving module group is taken as a signal of a measurement reference, the amplitude is marked as A0, the phase is marked as P0, the amplitude and the phase of the optical signal returned by the optical receiving module 1 are invariable all the time, the amplitude and the phase of the optical signal are invariable, the test point M1 signal and the test point M2 signal are the same-amplitude and same-phase signals formed by the same-channel signal power division of a third optical receiving unit, the signals from the optical receiving module 1 to the optical receiving module N in the optical receiving module group are returned, the signals are output after being switched and selected by An N-type 1 MEMS optical switch, the test point M3 signal is a radio frequency signal sent by a signal source or a network, the phase is marked as P, the amplitude of the return signals S1-Sn of the optical receiving module is marked as A1-An, and the phase is marked as P1-Pn;
2) The M2 signal is connected into a spectrometer, signals returned by the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from An N1 type MEMS optical switch, the amplitude of the signals returned by the light receiving module N-1 to M2 is set to be An -1, the amplitude of the signals returned by the light receiving module N to M2 is set to be An, the amplitude difference of the two signals measured by the spectrometer is recorded as delta AYQ, delta AYQ =an -1 -An, because the two signals of M2 and M1 are in the same phase, the amplitude of the signals returned by the light receiving module N-1 to M1 is also An -1, the amplitude of the signals returned by the light receiving module N to M2 is also An, the amplitude value returned by the light receiving module 1 to M0 is assumed to be A0, the amplitude difference between the two signals of the M1 signal and the M0 test signal can be measured by using An amplitude-phase measuring module, the difference between the first measured An -1 and A0 is delta A1, namely delta A1=4-A0; the difference between the second measurement An and A0 is denoted as Δa2, i.e., Δa2=an-A0, and if the difference between the two measurements is Δafx, Δafx=Δa1- Δa2= (An -1-A0)-(An-A0)＝An-1 -An, thus Δ AYQ =Δafx is obtained, which indicates that the measurement result of the amplitude by the amplitude-phase measurement module is consistent with the measurement result of the spectrometer;
3) The M3 signal and the M2 signal are connected into a vector network analyzer, signals returned from the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from an N:1 type MEMS optical switch, the phase of the signal at the M3 position is marked as P, the phase of the signal returned from the light receiving module N-1 to the M2 position is set as Pn -1, the phase of the signal returned from the light receiving module N to the M2 position is set as Pn, and a spectrometer is used for measuring the difference value between Pn -1 and P for the first time and marking as DeltaP 1, namely DeltaP1=Pn -1 -P; the difference between the nth path and P is measured for the second time and is recorded as Δp2, Δp2=pn—p; let the difference between the two measurements be Δ PYQ, then Δ PYQ =Δp1- Δp2= (Pn -1-P)-(Pn-P)＝Pn-1 -Pn, the same applies to the measurement of the phase difference between the M1 signal and the M0 signal by the amplitude phase measurement module, let the phase value of the light receiving module 1 transmitted back to M0 be A0, since the two signals M2 and M1 are in phase with each other, the phase of the signal transmitted back to M1 by the light receiving module N-1 is also Pn -1, the phase of the signal transmitted back to M1 by the light receiving module N is also Pn, the first measurement between Pn -1 and P0 is denoted Δp1, i.e. Δp1=pn -1 -P0, the second measurement between Pn and P0 is denoted Δp2, i.e. Δp2=pnp 0, and the difference between the two measurements is denoted Δpfx, then Δpfx=Δp1- Δp2= (Pn -1-P0)-(Pn-P0)＝Pn-1 -PYQ =pfx) the measured result of the amplitude phase of the light receiving module is identical to that of the frequency spectrum measured by the amplitude phase measurement module.
In the example, the number of measuring paths can be infinitely added only by changing the paths of the pull-cone type 1:2 optical splitter and the N:1 MEMS optical switch in the optical selection module, the automatic measurement between multiple paths of data can be realized by controlling the selection of the optical switch by using a control circuit, and two different signals can be transmitted and received by the optical signal by using a wavelength division multiplexing method, and the two signal paths are the same and are not interfered by external environments, so that the measurement precision and stability are improved.
By adopting the technical scheme, the measuring frequency range is 0-2.7 GHz, the measuring amplitude range is-60 dBm-0 dBm, which is determined by the input range requirement of the AD8302 amplitude phase measuring chip; the phase measurement precision is less than or equal to 0.5 DEG, the amplitude measurement precision is less than or equal to 0.1dB, which is determined by the resolution of the output voltage of the AD8302 and the bit number of the A/D sampling, the theoretically obtained phase measurement precision is 0.228 DEG, the amplitude measurement precision is 0.076dB, the phase precision is less than or equal to 0.5 DEG, and the amplitude precision is less than or equal to 0.1dB in practical application.
Claims (5)
1. The multipath radio frequency optical transmission signal amplitude and phase measuring device is characterized by comprising an optical selection module, an optical emission module connected with the optical selection module, a measuring module and a group of optical receiving module groups with consistent specifications, wherein the optical emission module and the measuring module are electrically connected with a frequency spectrograph and a vector network analyzer during measurement verification and calibration:
The optical selection module comprises a 1:N optical branching device, wherein the 1:N optical branching device is sequentially connected, the optical selection module comprises a wavelength division multiplexer group, a pull cone type 1:2 optical branching device and an N:1 type MEMS optical switch, the wavelength division multiplexer group is provided with the wavelength division multiplexer 1 to the wavelength division multiplexer N, N is a natural integer, the 1:N optical branching device is connected with the optical transmission module, optical signals sent by the optical transmission module are divided into N paths of optical outputs, after the 1:N optical branching device receives the optical signals sent by the optical transmission module, the N paths of optical signals are divided into N paths of optical outputs and are connected to 1550nm transmitting ports of the wavelength division multiplexer group, the optical signals returned by the N paths of optical receiving module are connected to 1310nm receiving ports of the wavelength division multiplexer group, the wavelength division multiplexer 1 is output to the pull cone type 1:2 optical branching device and is divided into two paths of optical outputs, one path of the output of the pull cone type 1:2 optical branching device is used as a reference signal to be connected with the measuring module, the other paths of output of the pull cone type 1:2 optical branching device are correspondingly connected with the output ends of the rest of the optical branching device, the output ends of the optical signals are correspondingly connected with the N-type 1:1 optical branching device optical signal output port, the N-type MEMS optical switch is connected with the N-type 1 optical switch, and the N-type optical switch is used as a measuring port of the measuring module is connected with the N-type 1 optical switch, and the measuring port is connected with the N-type optical switch, and the measuring port is connected with the measuring port 1;
The optical receiving module group is provided with optical receiving modules 1 to N, wherein N is se:Sub>A natural integer, the electric output interface model of each optical receiving module is SMA-KFK-1, the electric output interface model of each optical receiving module is FC-A-03, the optical receiving module group is provided with se:Sub>A wavelength division multiplexing unit with the wavelength of 1550nm and se:Sub>A first optical receiving unit and an optical transmitting unit which are connected with the wavelength division multiplexing unit, the wavelength division multiplexing unit receives 1550nm optical signals and inputs the optical signals to the first optical receiving unit, the first optical receiving unit changes the optical signals into electric signals and inputs the electric signals to the optical transmitting unit, the optical transmitting unit is connected to se:Sub>A 1310nm transmitting end of the wavelength division multiplexing unit through optical fibers and transmits the electric signals back to the wavelength division multiplexer in the optical selecting module;
The measuring module is characterized in that the type of an electric output interface of the measuring module is SMA-KFK-1, the type of an optical interface of the measuring module is FC-A-03, the measuring module comprises an amplitude and phase measuring unit, se:Sub>A second optical receiving unit, se:Sub>A third optical receiving unit and se:Sub>A reporting unit, wherein the second optical receiving unit, the third optical receiving unit and the amplitude and phase measuring unit are connected, se:Sub>A 1-to-2 electric power divider is arranged in the third optical receiving unit, the two optical receiving units are responsible for converting two received optical signals into electric signals, the second optical receiving unit is connected with se:Sub>A 1:2 optical splitter in the optical selecting module, se:Sub>A reference optical signal output by the 1:2 optical splitter is connected to the second optical receiving unit, the third optical receiving unit is connected with an N:1 MEMS optical switch in the optical selecting module, the third optical receiving unit outputs two electric signals with the same amplitude and phase, one path of the electric signals are input to the amplitude and phase measuring unit, the other path of electric signals are output to se:Sub>A vector network analyzer or se:Sub>A frequency spectrograph for measurement calibration, and the amplitude and phase measuring unit outputs one path of signals to the reporting unit for reporting measured datse:Sub>A.
2. The apparatus of claim 1, wherein the wavelength division multiplexer has a wavelength of 1550nm for transmission and 1310nm for reception.
3. The multi-channel rf optical transmission signal amplitude-phase measuring apparatus of claim 1, wherein the n:1 MEMS optical switch wavelength is 1310nm.
4. The multi-channel radio frequency optical transmission signal amplitude and phase measuring device according to claim 1, wherein the electric input interface of the optical power generation module is of an SMA-KFK-1 type, the output optical interface of the optical power generation module is of an FC-A-03 type, an optical power generation unit consisting of se:Sub>A high-power laser is arranged, radio frequency electric signals can be converted into optical signals to be output, the output optical wavelength is 1550nm, the optical power is 10dBm, and the output optical signals are connected with se:Sub>A 1:N optical splitter in the optical selection module.
5. A measurement and verification method for a multi-channel radio frequency optical transmission signal amplitude and phase measurement device according to any one of claims 1 to 4, comprising the steps of:
1) Defining test parameters: the test point M0 signal is An optical receiving signal output by a second optical receiving unit, a return optical signal from An optical receiving module 1 in An optical receiving module group is taken as a signal of a measurement reference, the amplitude is marked as A0, the phase is marked as P0, the amplitude and the phase of the optical signal returned by the optical receiving module 1 are kept unchanged, namely, the amplitude and the phase of the optical signal returned by the optical receiving module 1 are constant, the test point M1 signal and the test point M2 signal are the same-amplitude and same-phase signals formed by dividing the same signal power of a third optical receiving unit, the signals from the optical receiving module 1 to the optical receiving module N in the optical receiving module group are returned, the signals are output after being switched and selected by An N-type 1 MEMS optical switch, the test point M3 signal is a radio frequency signal sent by a signal source or a vector network analyzer, the phase is marked as P, and the amplitudes of the return signals S1-Sn of the optical receiving module are marked as A1-An, and the phase is marked as P1-Pn;
2) The M2 signal is connected into a spectrometer, signals returned by the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from An N1 type MEMS optical switch, the amplitude of the signals returned by the light receiving module N-1 to M2 is set to be An -1, the amplitude of the signals returned by the light receiving module N to M2 is set to be An, the amplitude difference of the two paths of signals measured by the spectrometer is recorded as delta AYQ, then delta AYQ =an -1 -An, the amplitude of the signals returned by the light receiving module N-1 to M1, which are in the same phase, is the amplitude of the signals returned by the light receiving module N-1 to M1 is also An -1, the amplitude of the signals returned by the light receiving module N to M2 is also An, the amplitude value returned by the light receiving module 1 to M0 is assumed to be A0, the amplitude difference between the two paths of signals of the M1 signal and the M0 can be measured by using An amplitude phase measuring module, the difference between the first measured An -1 and A0 is recorded as delta A1, namely delta A1 = 4-A0; the difference between the second measurement An and A0 is denoted as Δa2, i.e., Δa2=an-A0, and if the difference between the two measurements is Δafx, Δafx=Δa1- Δa2= (An -1-A0)-(An-A0)＝An-1 -An, thus Δ AYQ =Δafx is obtained, which indicates that the measurement result of the amplitude by the amplitude-phase measurement module is consistent with the measurement result of the spectrometer;
3) The M3 signal and the M2 signal are connected into a vector network analyzer, signals returned from the light receiving modules 1 to N in the light receiving module group are sequentially switched and output from an N:1 type MEMS optical switch, the phase of the signal at the M3 position is marked as P, the phase of the signal returned from the light receiving module N-1 to the M2 position is set as Pn -1, the phase of the signal returned from the light receiving module N to the M2 position is set as Pn, and a spectrometer is used for measuring the difference value between Pn -1 and P for the first time and marking as DeltaP 1, namely DeltaP1=Pn -1 -P; the difference between the nth path and P is measured for the second time and is recorded as Δp2, Δp2=pn—p; let the difference between the two measurements be Δ PYQ, then Δ PYQ =Δp1- Δp2= (Pn -1-P)-(Pn-P)＝Pn-1 -Pn, the same applies to the measurement of the phase difference between the M1 signal and the M0 signal by the amplitude phase measurement module, let the phase value of the light receiving module 1 transmitted back to M0 be A0, since the two signals M2 and M1 are in phase with each other, the phase of the signal transmitted back to M1 by the light receiving module N-1 is also Pn -1, the phase of the signal transmitted back to M1 by the light receiving module N is also Pn, the first measurement between Pn -1 and P0 is denoted Δp1, i.e. Δp1=pn -1 -P0, the second measurement between Pn and P0 is denoted Δp2, i.e. Δp2=pnp 0, and the difference between the two measurements is denoted Δpfx, then Δpfx=Δp1- Δp2= (Pn -1-P0)-(Pn-P0)＝Pn-1 -PYQ =pfx) the measured result of the amplitude phase of the light receiving module is identical to that of the frequency spectrum measured by the amplitude phase measurement module.
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