CN212572555U - Light intensity modulation radio frequency signal amplitude measuring circuit - Google Patents
Light intensity modulation radio frequency signal amplitude measuring circuit Download PDFInfo
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- CN212572555U CN212572555U CN202021491247.5U CN202021491247U CN212572555U CN 212572555 U CN212572555 U CN 212572555U CN 202021491247 U CN202021491247 U CN 202021491247U CN 212572555 U CN212572555 U CN 212572555U
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Abstract
The utility model discloses a light intensity modulation radio frequency signal amplitude measurement circuit, the output of stable light source is connected 1: common end of n optical splitters, 1: the n light splitting ends of the n light splitters are respectively connected with the transmission ends of the n wavelength division multiplexers; the reflection ends of the n wavelength division multiplexers are respectively connected with n paths of tested radio frequency return signals; the common ends of the n wavelength division multiplexers are respectively connected with n: 1n inputs of an optical switch; n: the output end of the 1 optical switch is connected with the common end of the (n + 1) th wavelength division multiplexer; the transmission end of the (n + 1) th wavelength division multiplexer is connected with the insertion loss measuring end of the control calculation module through the input end of the optical power measuring module; the reflection end of the (n + 1) th wavelength division multiplexer is connected with the amplitude measurement end of the control calculation module through the output ends of the radio frequency light receiving module and the radio frequency amplitude measurement module. The utility model has the characteristics of measurement accuracy is high, measuring speed is fast, easily realize, and is with low costs, the facilitate promotion is used.
Description
Technical Field
The utility model relates to an optical fiber communication technical field, concretely relates to luminous intensity modulation radio frequency signal amplitude measurement circuit.
Background
With the development of modern optical fiber communication technology, the optical fiber communication technology has been increasingly applied to the field of radio frequency signal optical fiber transmission. Although most of the existing radio frequency signal optical fiber transmission systems have no requirements on technical indexes of amplitude consistency, in certain specific application occasions, such as a multipath radio frequency signal optical fiber transmission system applied to the fields of phase measurement, phased array radar and the like, the requirements on the indexes of the amplitude consistency of multipath radio frequency signals are strict because the multipath radio frequency signal optical fiber transmission system often relates to national security or large-scale detection items. The working performance index of the system can be ensured only if the amplitude consistency index of the multi-channel radio frequency signals is controlled within a specified range.
In engineering application, due to the influence of factors such as temperature change and the like, the amplitude of the radio-frequency signal transmitted by the optical fiber can drift, so that the amplitude consistency index of the radio-frequency signal at the same moment can be objectively reflected only by quickly measuring. If the measurement time is long, because the Tn time for measuring the n-channel radio frequency signal is delayed by a long time compared with the T1 time for measuring the 1 st-channel radio frequency signal, the amplitude value of the n-channel radio frequency signal measured at the Tn time is greatly changed relative to the amplitude value of the n-channel radio frequency signal measured at the T1 time, and therefore the amplitude consistency index of the radio frequency signals of all channels at the same time cannot be truly reflected, which is not allowed for the application occasion with high requirement on the amplitude consistency of the radio frequency signals.
In order to complete the amplitude measurement of all the N-channel rf signals to be measured, the currently adopted method is to transmit the rf signals of each transmitting station back to the same location (e.g., a central station). Although the amplitude value measurement of all the N-channel radio frequency signals to be measured is completed at the same time, the obtained system amplitude consistency index is more accurate, but in view of the high price of the current vector network analyzer and the generally small number of access ports (1-4), it is difficult to complete the amplitude value measurement of all the N-channel radio frequency signals to be measured at one time. Therefore, the optical path selection switching needs to be performed manually, and the amplitude measurement of all the N-channel radio frequency signals is completed in a batch measurement mode. Namely: firstly, n-channel radio frequency optical signals (n is less than or equal to the number of access ports of the vector network analyzer) are accessed into n-channel optical receiving equipment for photoelectric conversion, and the converted radio frequency electrical signals are sent to the vector network analyzer for amplitude measurement. Then, the other n-channel radio frequency optical signals are accessed into the optical receiving equipment for photoelectric conversion, and the converted radio frequency electrical signals are sent to a vector network analyzer for amplitude measurement. And repeating the steps until the amplitude measurement of all the N-channel radio frequency signals to be measured is completed. However, in the measurement process, the rf optical signal needs to be connected to the optical receiving device through the optical fiber adapter by using a short optical fiber (optical fiber jumper), the Insertion Loss (IL) of the optical fiber adapter is usually about 0.2 to 0.5dB, and the insertion loss of the optical fiber adapter changes every time the optical fiber adapter is connected, so the amplitude of the rf optical signal output by the optical receiving device also changes correspondingly, and the change value is 2 × ILdB. This will inevitably cause errors in the amplitude values measured by the vector network analyzer, and further affect the measurement accuracy of the system amplitude consistency index.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the amplitude consistency measurement method of the existing multichannel radio frequency signal optical fiber transmission system has low speed and low measurement accuracy, and provides a light intensity modulation radio frequency signal amplitude measurement circuit.
In order to solve the above problems, the utility model discloses a realize through following technical scheme:
a light intensity modulation radio frequency signal amplitude measuring circuit is characterized by comprising a stable light source, 1: n optical splitter, n +1 wavelength division multiplexers, n: 1, an optical switch, a radio frequency light receiving module, a radio frequency amplitude measuring module, an optical power measuring module and a control calculating module;
the output end of the stable light source is connected with 1: common end of n optical splitters, 1: the n light splitting ends of the n light splitters are respectively connected with the transmission ends of the n wavelength division multiplexers; the reflection ends of the n wavelength division multiplexers are respectively connected with n paths of tested radio frequency return signals; the common ends of the n wavelength division multiplexers are respectively connected with n: 1n inputs of an optical switch; n: the output end of the 1 optical switch is connected with the common end of the (n + 1) th wavelength division multiplexer;
the transmission end of the (n + 1) th wavelength division multiplexer is connected with the input end of the optical power measurement module, and the output end of the optical power measurement module is connected with the insertion loss measurement end of the control calculation module;
the reflection end of the (n + 1) th wavelength division multiplexer is connected with the input end of the radio frequency light receiving module, the output end of the radio frequency light receiving module is connected with the input end of the radio frequency amplitude measuring module, and the output end of the radio frequency amplitude measuring module is connected with the amplitude measuring end of the control calculation module; the control end of the control calculation module is respectively connected with n: 1, control ends of an optical switch, a radio frequency amplitude measurement module and an optical power measurement module;
the n is the number of the RF return signal paths.
As an improvement, the optical intensity modulation radio frequency signal amplitude measuring circuit further comprises a variable optical attenuator; the input end of the variable optical attenuator is connected with the reflection end of the (n + 1) th wavelength division multiplexer, and the output end of the variable optical attenuator is connected with the input end of the radio frequency light receiving module; and the control end of the variable optical attenuator is connected with the control end of the control calculation module.
In the above scheme, the communication end of the control calculation module is further connected with an external computer.
In the scheme, the value range of n is 1-36.
Compared with the prior art, the utility model has the characteristics of as follows:
1. the problem of large amplitude measurement error caused by poor repeatability of optical switch switching loss in a measurement link is solved, the measurement precision can reach 0.1dB, and an amplitude consistency measurement device and method are provided for application system engineering with high amplitude consistency requirements;
2. the problem of measuring the cycle time of the amplitude consistency of multiple paths of signals is solved, and the measuring time of a 16-path channel is not more than 5 minutes;
3. the measuring circuit adopts the existing components, is easy to realize and has low cost;
4. the measuring method is simple and easy to implement, and is convenient to popularize and apply.
Drawings
Fig. 1 is a schematic block diagram of an optical intensity modulation rf signal amplitude measurement circuit.
Fig. 2 is a flowchart of a method for measuring the amplitude of an optical intensity modulated radio frequency signal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
An optical intensity modulation radio frequency signal amplitude measuring circuit is mainly composed of a stable light source, 1: 16 optical splitters, 17 wavelength division multiplexers, 16: 1 optical switch, radio frequency light receiving module, radio frequency amplitude measuring module, optical power measuring module and control calculating module.
The output end of the stable light source is connected with 1: common terminal of 16 optical splitter, 1: the 16 light splitting ends of the 16 light splitters are respectively connected with the transmission ends of the 16 wavelength division multiplexers, namely 1: 16, the first light splitting end of the optical splitter is connected with the transmission end of the first wavelength division multiplexer, 1: the second light splitting end of the 16 optical branching device is connected with the transmission end of the second wavelength division multiplexer, and so on, 1: and the sixteenth light splitting end of the 16 optical splitter is connected with the transmission end of the sixteenth wavelength division multiplexer. The reflection ends of the 16 wavelength division multiplexers are respectively connected with the 16 measured radio frequency return signals, that is, the reflection end of the first wavelength division multiplexer is connected with the first measured radio frequency return signal, the reflection end of the second wavelength division multiplexer is connected with the second measured radio frequency return signal, and so on, and the reflection end of the sixteenth wavelength division multiplexer is connected with the sixteenth measured radio frequency return signal. The common ends of the 16 wavelength division multiplexers are respectively connected with 16: 1 16 input terminals of the optical switch, namely, a common terminal of the first wavelength division multiplexer is connected with 16: 1, a first input end of the optical switch, and a common end of the second wavelength division multiplexer are connected with 16: 1 second input of the optical switch, and so on, and the common terminal of the sixteenth wavelength division multiplexer is connected to 16: 1 sixteenth input terminal of the optical switch. 16: and the output end of the 1 optical switch is connected with the common end of the seventeenth wavelength division multiplexer. And the transmission end of the seventeenth wavelength division multiplexer is connected with the input end of the optical power measuring module, and the output end of the optical power measuring module is connected with the insertion loss measuring end of the control calculating module. The reflection end of the seventeenth wavelength division multiplexer is connected with the input end of the radio frequency light receiving module, the output end of the radio frequency light receiving module is connected with the input end of the radio frequency amplitude measuring module, and the output end of the radio frequency amplitude measuring module is connected with the amplitude measuring end of the control calculation module. The control ends of the control calculation modules are respectively connected with 16: 1 control end of optical switch, radio frequency amplitude measuring module and optical power measuring module. And the communication end of the control calculation module is connected with an external computer.
In order to enlarge the application of the circuit, in the preferred embodiment of the present invention, a tunable optical attenuator is additionally connected in series between the reflection end of the seventeenth wavelength division multiplexer and the input end of the rf optical receiving module to adjust the insertion loss value, so as to enlarge the power range of the measured rf return signal. The input end of the variable optical attenuator is connected with the reflection end of the seventeenth wavelength division multiplexer, and the output end of the variable optical attenuator is connected with the input end of the radio frequency light receiving module; and the control end of the variable optical attenuator is connected with the control end of the control calculation module.
In this embodiment, the output power of the stable light source is +9 to +11dBm, the optical power stability is 0.01dB/h, and the optical wavelength is a single mode 1610nm ± 1nm or differs from the optical wavelength of the rf return signal by more than 10 nm. The following steps of 1: the 16 optical splitters are single-mode optical splitters, the consistency of the 16 output optical power is better than 0.2dB, and the insertion loss is not more than 15 dB. The 17 wavelength division multiplexers are all single-mode wavelength division multiplexers, the insertion loss from the transmission end to the public end and from the reflection end to the public end is not more than 1dB, and the consistency is better than 0.2 dB. The 16: the 1 optical switch is a single-mode MEMS optical switch, the insertion loss of the 1 optical switch is not more than 1.5dB, the repeatability is excellent by 1dB, the crosstalk is better than 50dB, and the switching time is better than 50 ms. The variable optical attenuator is a single-mode electric control or manual optical attenuator, the insertion loss is not more than 1.5dB, the maximum attenuation is 20dB, and the optical power measurement range is-3- +10 dBm. The optical power receiving range of the radio frequency optical receiving module is-15-0 dBm, the working frequency is 5 MHz-2.5 GHz, the output impedance is 50 omega, the output amplitude is-10 dBm @0 +/-1 dBm, the optical power is input, and the temperature stability is 0.2dB after the amplitude is 48 h. The radio frequency amplitude measurement module has the input impedance of 50 omega, the working frequency of 5 MHz-2.5 GHz, the amplitude of-50-0 dBm, the amplitude measurement precision of 0.1dB, the amplitude temperature stability of 48h of 0.05dB and the AD sampling digit of 12 bits. The optical power receiving range of the optical power measuring module is-20-0 dBm, the AD sampling bit number is 12 bits, the measuring precision is 0.1dB, and the 48h amplitude temperature stability is 0.05 dB.
The control calculation module controls 16 through a serial port: 1 optical switch, selecting 1 channel output, 16: 1 optical switch channel switching code is shown in the following table:
| D0 | D1 | D2 | D3 | connecting channel |
| 0 | 0 | 0 | 0 | 1 |
| 1 | 0 | 0 | 0 | 2 |
| 0 | 1 | 0 | 0 | 3 |
| 1 | 1 | 0 | 0 | 4 |
| 0 | 0 | 1 | 0 | 5 |
| 1 | 0 | 1 | 0 | 6 |
| 0 | 1 | 1 | 0 | 7 |
| 1 | 1 | 1 | 0 | 8 |
| 0 | 0 | 0 | 1 | 9 |
| 1 | 0 | 0 | 1 | 10 |
| 0 | 1 | 0 | 1 | 11 |
| 1 | 1 | 0 | 1 | 12 |
| 0 | 0 | 1 | 1 | 13 |
| 1 | 0 | 1 | 1 | 14 |
| 0 | 1 | 1 | 1 | 15 |
| 1 | 1 | 1 | 1 | 16 |
The rf backhaul signal passes through 16: 1 when the optical switch is switched and input to a measuring circuit for measurement, because the switching loss repeatability of the optical switch is poor, the insertion loss during each switching is different, the insertion loss during each switching of the optical switch is measured by using a stable light source as a reference signal, and then the insertion loss of the optical switch is subtracted from the measured value of the radio frequency return signal, so that the amplitude value of the radio frequency return signal can be obtained. The same method measures 16 paths of radio frequency return signals, calculates the amplitude difference of the signals, obtains the amplitude consistency index, and the measurement precision can reach 0.2 dB. When amplitude consistency measurement is carried out, 1 path of radio frequency return signal with the optical power closest to the average value is selected to be input into the adjustable optical attenuator, the attenuation amount of the adjustable optical attenuator is adjusted, the output optical power after adjustment is within minus 8dBm +/-1 dB, and then amplitude values of all channels are measured (in the system design, in order to ensure system indexes, the optical power transmitted back to the central station by the radio frequency return signal of the front end station is basically consistent in magnitude).
As shown in fig. 2, the method for measuring the amplitude of the light intensity modulated radio frequency signal implemented by the system specifically includes the following steps:
in the system application, the optical power of the 16-path radio frequency return signal of the front-end station is adjusted within the range of-5 dBm to +10 dBm. During amplitude measurement, the first path of radio frequency return signal optical fiber is connected with the reflection end of the first wavelength division multiplexer, the second path of radio frequency return signal optical fiber is connected with the reflection end of the second wavelength division multiplexer, and so on, and the sixteenth path of radio frequency return signal optical fiber is connected with the reflection end of the sixteenth wavelength division multiplexer. The communication end of the control calculation module is connected with a network interface of the computer. The stable light source sends a stable light source signal to 1: common terminal of 16 optical splitter, 1: the 16 optical splitters equally split the stable light source signal into 16 optical signals which are respectively sent to the transmission ends of the 16 wavelength division multiplexers. The 16 wavelength division multiplexers respectively multiplex the light source signals and the radio frequency return signals and respectively transmit the multiplexed signals to 16: 1 input of an optical switch.
The control end of the control calculation module sends out a measurement command, and the measurement command is input into the 16: 1 optical switch control terminal, 16: the 1 optical switch selects channels according to a command, outputs optical signals (which are multiplexed optical signals and comprise radio frequency return signals and stable light source signals) of a selected channel i (i ═ 1-16) to a common terminal of a seventeenth wavelength division multiplexer, and the seventeenth wavelength division multiplexer demultiplexes the input optical signals. The transmission end of the seventeenth wavelength division multiplexer outputs a stable light source signal, and the reflection end outputs a radio frequency return signal.
And the stable light source signal output by the transmission end of the seventeenth wavelength division multiplexer is input to the optical power measurement module. The optical power measurement module restores the stable light source signal into an electric signal through optical/electrical conversion, the electric signal is sampled through an A/D (analog/digital) with 12bit of conversion digit, and the obtained AD data is output to the control calculation module through an output port for processing. The AD data is a steady light source signal passing through 1: 16 optical splitters, ith wavelength division multiplexer (i 1 ~ 16), 16: and (3) taking the optical power value transmitted by the optical switch 1 and the seventeenth wavelength division multiplexer as a calculation channel insertion loss reference value Vbi.
And the radio frequency return signal output by the reflection end output by the seventeenth wavelength division multiplexer is input to the adjustable optical attenuator. The adjustable optical attenuator attenuates the radio frequency return signal and then sends the radio frequency return signal to the radio frequency light receiving module. The radio frequency light receiving module performs photoelectric conversion on the attenuated radio frequency return signal to recover an electric signal,the radio frequency signal is amplified and then output to the radio frequency amplitude measuring module. The radio frequency amplitude measurement module detects the radio frequency signal, then samples through the A/D with 12bit of conversion number of bits, and the obtained radio frequency AD data is output to the control calculation module for processing through an output port. The radio frequency AD data is a radio frequency return signal passing through an i-th wavelength division multiplexer (i is 1-16), 16: 1 optical switch, seventeenth wavelength division multiplexer, variable optical attenuator and radio frequency return signal radio frequency amplitude measured value V after transmission of radio frequency optical receiving moduleai。
In view of the RF return signal RF measurement value VaiThe control calculation module needs to control the channel insertion loss reference value V output by the optical power measurement module at present according to the value of the RF amplitude which is not the real RF amplitude value of the RF return signalbiAnd the current radio frequency amplitude measured value V output by the radio frequency amplitude measuring moduleaiCalculating the true value V of the ith path of RF return signaliNamely:
Vi(dB)＝Vai(dB)-2*Vbi (dB)
controlling a measurement command sent by a control end of the calculation module to 16: 1, selecting channels by the control end of the optical switch, selecting channels i from 1,2 and up to 16 in sequence, and simultaneously testing the radio frequency amplitude measurement value (V) of 16 radio frequency return signalsa1、Va2、…、Va16) And corresponding channel insertion loss reference value (V)b1、Vb2、…、Vb16) Finally, the control calculation module calculates the real value (V) of each path of radio frequency return signal1、V2、…、V16)。
The real values of every 2 paths of radio frequency return signals of the control calculation module are compared, so that the consistency of the amplitude of the light intensity modulation radio frequency signal is calculated, namely when the error value of the real value of the jth path of radio frequency return signal and the real value of the kth path of radio frequency return signal is in a preset threshold value, the two paths of radio frequency return signals meet the consistency requirement, otherwise, the consistency requirement is not met; wherein
ΔVj-k(dB)＝Vj(dB)-Vk (dB)；
Wherein, is Δ Vj-kIs the true of the jth RF return signalError value, V, between real value and real value of k-th RF return signaljIs the true value, V, of the jth RF return signalkThe true value of the kth radio frequency return signal is obtained; j, k is 1,2, …, n, j ≠ k, and n is the number of channels of the rf backhaul signal.
In this embodiment, according to the requirement, when the error values between the real values of the 2 nd to 16 th rf backhaul signals and the real value of the 1 st rf backhaul signal are both within the preset threshold, the requirement for consistency is satisfied, otherwise, the requirement for consistency is not satisfied. Wherein:
ΔVj-1(dB)＝Vj(dB)-V1 (dB)；
wherein, is Δ Vj-1Is the amplitude error value, V, of the ith measured RF return signal and the 1 st measured RF return signaljIs the true value, V, of the ith RF return signal1The actual value of the 1 st rf backhaul signal, j equals 2,3, …, n, n is the number of the rf backhaul signals.
Controlling the calculation module to send the real value (V) of the 16-channel radio frequency return signal1、V2、…、V16) And reporting the final amplitude consistency result to an external computer.
It should be noted that, although the above-mentioned embodiments of the present invention are illustrative, the present invention is not limited thereto, and therefore, the present invention is not limited to the above-mentioned embodiments. Other embodiments, which can be made by those skilled in the art in light of the teachings of the present invention, are considered to be within the scope of the present invention without departing from the principles thereof.
Claims (4)
1. A light intensity modulation radio frequency signal amplitude measuring circuit is characterized by comprising a stable light source, 1: n optical splitter, n +1 wavelength division multiplexers, n: 1, an optical switch, a radio frequency light receiving module, a radio frequency amplitude measuring module, an optical power measuring module and a control calculating module;
the output end of the stable light source is connected with 1: common end of n optical splitters, 1: the n light splitting ends of the n light splitters are respectively connected with the transmission ends of the n wavelength division multiplexers; the reflection ends of the n wavelength division multiplexers are respectively connected with n paths of tested radio frequency return signals; the common ends of the n wavelength division multiplexers are respectively connected with n: 1n inputs of an optical switch; n: the output end of the 1 optical switch is connected with the common end of the (n + 1) th wavelength division multiplexer;
the transmission end of the (n + 1) th wavelength division multiplexer is connected with the input end of the optical power measurement module, and the output end of the optical power measurement module is connected with the insertion loss measurement end of the control calculation module;
the reflection end of the (n + 1) th wavelength division multiplexer is connected with the input end of the radio frequency light receiving module, the output end of the radio frequency light receiving module is connected with the input end of the radio frequency amplitude measuring module, and the output end of the radio frequency amplitude measuring module is connected with the amplitude measuring end of the control calculation module; the control end of the control calculation module is respectively connected with n: 1, control ends of an optical switch, a radio frequency amplitude measurement module and an optical power measurement module;
the n is the number of the RF return signal paths.
2. The optical intensity modulated radio frequency signal amplitude measurement circuit of claim 1, further comprising a variable optical attenuator; the input end of the variable optical attenuator is connected with the reflection end of the (n + 1) th wavelength division multiplexer, and the output end of the variable optical attenuator is connected with the input end of the radio frequency light receiving module; and the control end of the variable optical attenuator is connected with the control end of the control calculation module.
3. The optical intensity modulation radio frequency signal amplitude measurement circuit according to claim 1 or 2, wherein the communication terminal of the control calculation module is further connected with an external computer.
4. The optical intensity modulation radio frequency signal amplitude measurement circuit of claim 1, wherein a value of n ranges from 1 to 36.
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| CN111884717A (en) * | 2020-07-24 | 2020-11-03 | 中国电子科技集团公司第三十四研究所 | Light intensity modulation radio frequency signal amplitude measuring circuit and measuring method |
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| CN111884717A (en) * | 2020-07-24 | 2020-11-03 | 中国电子科技集团公司第三十四研究所 | Light intensity modulation radio frequency signal amplitude measuring circuit and measuring method |
| CN111884717B (en) * | 2020-07-24 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Light intensity modulation radio frequency signal amplitude measuring circuit and measuring method |
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