CN212086198U - Self-adaptive high-precision optical fiber delay system - Google Patents
Self-adaptive high-precision optical fiber delay system Download PDFInfo
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- CN212086198U CN212086198U CN201922285590.8U CN201922285590U CN212086198U CN 212086198 U CN212086198 U CN 212086198U CN 201922285590 U CN201922285590 U CN 201922285590U CN 212086198 U CN212086198 U CN 212086198U
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Abstract
The utility model relates to a self-adaptive high-precision optical fiber delay system, which comprises an optical modulation circuit, a delay circuit and a delay circuit, wherein the optical modulation circuit is used for converting a radio frequency signal to be transmitted and a reference signal into an optical signal and combining the optical signal into an optical signal; the optical demodulation circuit is used for decomposing the modulated optical signal into two optical signals and converting the two optical signals into a radio frequency signal and a reference signal; the optical fiber delay circuit is used for realizing selection and switching of different delay optical fibers by controlling the optical switch, realizing tunability of delay time, and realizing accurate control of delay errors by detecting the delay time in real time and feeding back and controlling the optical fiber fine tuning unit. The utility model realizes the selection and switching of different delay optical fibers by controlling the optical switch, thereby realizing the tunability of delay time; the delay time is detected in real time, and the optical fiber fine adjustment unit is fed back and controlled, so that the delay time is accurately controlled, the optical fiber delay with large range, small volume, tunability and high precision is realized, and the use number of optical fibers and optical switches is reduced.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber delay, concretely relates to self-adaptation high accuracy optic fibre time delay system.
Background
The optical fiber delay assembly utilizes optical fibers as a delay medium, has the advantages of wide frequency band, long delay time, low loss, light weight, no electromagnetic interference and the like, can be applied to a radar target simulation system, can also be applied to a beam forming and controlling system of a phased array radar, is used as a phase shifter for beam control, and is used for improving the anti-interference capacity and resolution of the phased array radar and the imaging capacity of a multi-target radar. In addition, the optical fiber time delay assembly is widely applied to the field of electronic countermeasure, is used for electronic deception interference, and improves the protection and survival capability of the fighting unit of the own party. The traditional optical fiber delay assembly has the defects that the delay tuning range and the delay precision cannot be simultaneously met, and although the optical fiber delay system based on the optical switch solves the defect of small delay tuning range, the technical problems of large quantity and large volume of the optical switch and the delay optical fiber still exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a self-adaptation high accuracy optic fibre time delay system realizes the accurate control of delay time to optic fibre time delay on a large scale, tunable, high accuracy has been realized.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an adaptive high-precision optical fiber delay system comprising:
the optical modulation circuit is used for converting the radio frequency signal to be transmitted and the reference signal into an optical signal and combining the optical signal into a path of optical signal; the optical demodulation circuit is used for decomposing the modulated optical signal into two optical signals and converting the two optical signals into a radio frequency signal and a reference signal; the optical fiber delay circuit is used for realizing selection and switching of different delay optical fibers by controlling the optical switch, realizing tunability of delay time, and realizing accurate control of delay errors by detecting the delay time in real time and feeding back and controlling the optical fiber fine tuning unit.
As a further improvement of the above technical solution:
the optical fiber delay circuit comprises an optical fiber stepping adjustable delay module, an MCU processing module, an electric control optical fiber expansion piece, an optical switch control module and a fine adjustment control module;
the input end of the optical fiber stepping adjustable delay module is connected with the output end of the optical modulation circuit, the output end of the optical fiber stepping adjustable delay module is connected with the optical input end of the electric control optical fiber expansion piece, the output end of the electric control optical fiber expansion piece is connected with the input end of the optical demodulation circuit, the output end of the fine adjustment control module is connected with the control end of the electric control optical fiber expansion piece, the input end of the fine adjustment control module is connected with the output end of the MCU processing module, the input end of the optical switch control module is connected with the output end of the MCU processing module, and the output end of the optical switch control module is connected.
The optical demodulation circuit comprises a first photoelectric conversion module, a second photoelectric conversion module, a reference signal generation module and a wavelength division multiplexer; the output ends of the first photoelectric conversion module and the second photoelectric conversion module are connected with the input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is the output end of the light adjusting circuit, the input end of the first photoelectric conversion module is connected with a radio frequency input signal, and the input end of the second photoelectric conversion module is electrically connected with the output end of the reference signal generating module.
The light demodulation circuit comprises a wavelength division demultiplexer, a third photoelectric conversion module, a fourth photoelectric conversion module and a radio frequency amplifier, wherein the input end of the wavelength division demultiplexer is the input end of the light demodulation circuit, one output end of the light demodulation circuit is connected with the input end of the third photoelectric conversion module, the other output end of the light demodulation circuit is connected with the input end of the fourth photoelectric conversion module, and the output end of the third photoelectric conversion module is connected with the radio frequency output end through the radio frequency amplifier.
The optical fiber delay circuit further comprises a delay comparison module, two input ends of the delay comparison module are respectively connected with the output ends of the second photoelectric conversion module and the reference signal generation module, and the output end of the delay comparison module is connected with the input end of the MCU processing module.
The optical fiber stepping adjustable time delay module is formed by connecting a plurality of optical switches in series.
According to the technical scheme, the introduction of the pilot signal of the utility model generates a delay error signal, and the selection and switching of different delay optical fibers are realized by controlling the optical switch, so that the tuning of the delay time is realized; the delay time is detected in real time, and the optical fiber fine adjustment unit is fed back and controlled, so that the delay time is accurately controlled, the optical fiber delay with large range, small volume, tunability and high precision is realized, and the use number of optical fibers and optical switches is reduced.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is the optical fiber stepping adjustable time delay topology structure of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the adaptive high-precision optical fiber delay system of this embodiment includes:
the optical modulation circuit is used for converting the radio frequency signal to be transmitted and the reference signal into an optical signal and combining the optical signal into a path of optical signal; the optical demodulation circuit is used for decomposing the modulated optical signal into two optical signals and converting the two optical signals into a radio frequency signal and a reference signal; the optical fiber delay circuit is used for realizing selection and switching of different delay optical fibers by controlling the optical switch, realizing tunability of delay time, and realizing accurate control of delay errors by detecting the delay time in real time and feeding back and controlling the optical fiber fine tuning unit.
In this embodiment, the optical fiber delay circuit is composed of an optical fiber stepping adjustable delay module 6, an MCU processing module 15, an electronic control optical fiber expansion device 7, an optical switch control module 17, a fine tuning control module 18, a delay comparison module 13, a delay instruction input module 14, and a delay display module 16; the input end of the optical fiber stepping adjustable delay module 6 is connected with the output end of the optical modulation circuit, the output end of the optical fiber stepping adjustable delay module 6 is connected with the optical input end of the electric control optical fiber expansion piece 7, the output end of the electric control optical fiber expansion piece 7 is connected with the input end of the optical modulation circuit, the output end of the fine tuning control module 18 is connected with the control end of the electric control optical fiber expansion piece 7, the input end of the fine tuning control module 18 is connected with the output end of the MCU processing module 15, the input end of the optical switch control module 17 is connected with the output end of the MCU processing module 15, the output end of the optical switch control module 17 is connected with the input end of the optical fiber stepping adjustable delay module 6, two input ends of the delay comparison module 13 are respectively connected with the output ends of the second photoelectric conversion module 4 and the reference signal generation module 3, and, the output end of the delay instruction input module 14 is connected with the input end of the MCU processing module 15, and the input end of the delay display module 16 is connected with the output end of the MCU processing module 15.
The optical modulation circuit consists of a first photoelectric conversion module 2, a second photoelectric conversion module 4, a reference signal generation module 3 and a wavelength division multiplexer 5; the output ends of the first photoelectric conversion module 2 and the second photoelectric conversion module 4 are respectively connected with two input ends of a wavelength division multiplexer 5, the output end of the wavelength division multiplexer 5 is the output end of a light adjusting circuit and is connected with the input end of an optical fiber stepping adjustable time delay module 6, the input end of the first photoelectric conversion module 2 is connected with a radio frequency input signal 1, and the input end of the second photoelectric conversion module 4 is connected with the output end of a reference signal generating module 3.
The radio frequency signal to be transmitted is converted into one path of optical signal through the first electro-optical conversion module 2, the pilot frequency reference signal generated by the reference signal generation module 3 is converted into the other path of optical signal through the first electro-optical conversion module 4, the two paths of optical signals have different wavelengths, and the two paths of optical signals are compounded into one path of optical signal through the wavelength division multiplexer 5 and then sent to the optical fiber stepping adjustable delay module 6.
The optical demodulation circuit is composed of a wavelength division demultiplexer 8, a third photoelectric conversion module 9, a fourth photoelectric conversion module 12 and a radio frequency amplifier 10, the input end of the wavelength division demultiplexer 8 is the input end of the optical demodulation circuit and is connected with the output end of the electric control optical fiber expansion piece 7, one output end of the wavelength division demultiplexer 8 is connected with the input end of the third photoelectric conversion module 9, the other output end of the wavelength division demultiplexer is connected with the input end of the fourth photoelectric conversion module 12, and the output end of the third photoelectric conversion module 9 is connected with a radio frequency output end 11 through the radio frequency amplifier 10.
The output optical signal of the wavelength division multiplexer 5 realizes large-scale stepping delay through the optical fiber stepping adjustable delay module 6, the delayed signal realizes precise delay adjustment of a certain delay amount through the electric control optical fiber expansion piece 7, the output of the wavelength division multiplexer 8 is decomposed into a pilot frequency reference dimming signal and a radio frequency dimming signal, wherein the radio frequency dimming signal is converted into an electric signal through the third photoelectric conversion module 9 and then is output after being amplified through the radio frequency amplifier 10; the pilot frequency reference dimming signal is converted into a pilot frequency reference electric signal by the fourth photoelectric conversion module 12 and is sent to the delay comparison module 13, the delay comparison module 13 performs delay comparison on the undelayed reference signal and the output signal of the fourth photoelectric conversion module 12 to generate a delay error signal, the delay error signal is sent to the MCU processing module 15, the MCU processing module 15 receives the delay instruction of the delay instruction input module 14 on one hand, determines the required actual delay amount according to the delay error signal on the other hand, and controls the optical fiber stepping adjustable delay module through the optical switch control module 17 to realize different delay selections.
As shown in fig. 2, the optical fiber step adjustable delay module 6 is composed of a series of delay optical fibers with different steps, so as to realize wide-range tunable optical fiber delay. The MCU processing module 15 can also control the fine tuning control module 18 according to the delay error signal, and the fine tuning control module 18 further controls the electrically controlled fiber optic retractable line to realize the precise adjustment of the delay time, thereby realizing the high-precision delay control.
The utility model discloses the step-by-step adjustable time delay topological structure schematic diagram of optic fibre, as shown in fig. 2, what the step-by-step adjustable time delay topological structure of optic fibre mainly solved is delay time tau 1 ~ tau n, the technological problem of step-by-step tau, and the time delay optic fibre length that corresponds is L1 ~ Ln, step-by-step L, and the main technological measure of taking is that the optic fibre through the different length of optical switch control realizes step-by-step L, the switching of L1 ~ Ln time delay optic fibre selects. The difficulty is that the quantity of optical switches and delay fibers is used as little as possible in a limited volume, and a delay fiber combination topological structure needs to be constructed. The utility model discloses the step-by-step adjustable time delay topological structure of optic fibre (young optic fibre time delay topological structure) has creatively been provided to delay time 5ns ~ 2500ns, the step-by-step 5ns of time delay are for example, and the time delay optic fibre length that corresponds is 1m ~ 500m, and is step-by-step 1m, as shown in FIG. 2. Use the utility model provides a step-by-step adjustable time delay topological structure of optic fibre, only need 1m, 2m, 5m, 10m, 20m, 50m, 100m, 200m totally 11 sections optic fibre just can make up into 1m ~ 500m, step-by-step arbitrary optic fibre combination for 1m, such optic fibre topological structure only needs 12 photoswitch and 11 sections time delay optic fibre just can realize 1m ~ 500m, step-by-step arbitrary selection for 1m optic fibre, switch, compare traditional optic fibre time delay topological structure, the use quantity of photoswitch and optic fibre has significantly reduced, the volume and the weight of product have not only been reduced, and greatly improved the reliability of product, and the cost of product has been reduced.
In fig. 2, 1m, 2m, and 5m optical fibers realize arbitrary selection of optical fiber paths with 1m to 10m step values by optical switches k1, k2, k3, and k4, and similarly, 10m, 20m, and 50m optical fibers realize arbitrary selection of optical fiber paths with 10 to 100m step values by optical switches k5, k6, k7, and k 8; thus, the combination of 10m, 20m and 50m optical fibers and 1m, 2m and 5m optical fibers can realize the selection of any optical fiber with the step value of 1m to 110 m; similarly, the optical fibers of 100m, 200m and 200m realize the arbitrary selection of the optical fiber path with the step value of 100m to 500m through the optical switches k9, k10, k11 and k 12; and then the optical fiber can be combined with optical fibers of 1m, 2m, 5m, 10m, 20m and 50m to realize the selection of any optical fiber with the step value of 1 m-610 m being 1 m. For example, the optical switch k1 gates 1m, the optical switches k5 and k9 gate 10m and 100m, and the other optical switches are directly connected, so that 111m optical fiber selection can be realized, and similarly, any optical fiber with the step value of 1m to 610m can be selected.
In table 1, 0 and 1 indicate the optical on/off state, 0 indicates the through optical switch, and 1 indicates that the corresponding length of optical fiber is connected. By controlling the on and off of 12 optical switches k 1-k 12, the selection of any optical fiber with the step value of 1 m-610 m being 1m can be realized, and compared with the traditional design method, the method has the obvious advantages of less optical switches, less optical fiber rings, small volume, low cost, high reliability and the like.
TABLE 1
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. An adaptive high-precision optical fiber delay system, comprising:
the optical modulation circuit is used for converting the radio frequency signal to be transmitted and the reference signal into an optical signal and combining the optical signal into a path of optical signal;
the optical demodulation circuit is used for decomposing the modulated optical signal into two optical signals and converting the two optical signals into a radio frequency signal and a reference signal;
the optical fiber delay circuit is used for realizing selection and switching of different delay optical fibers by controlling the optical switch, realizing tunability of delay time, and realizing accurate control of delay errors by detecting the delay time in real time and feeding back and controlling the optical fiber fine tuning unit.
2. The adaptive high-precision optical fiber delay system according to claim 1, wherein: the optical fiber delay circuit comprises an optical fiber stepping adjustable delay module, an MCU processing module, an electric control optical fiber expansion piece, an optical switch control module and a fine adjustment control module;
the input end of the optical fiber stepping adjustable delay module is connected with the output end of the optical modulation circuit, the output end of the optical fiber stepping adjustable delay module is connected with the optical input end of the electric control optical fiber expansion piece, the output end of the electric control optical fiber expansion piece is connected with the input end of the optical demodulation circuit, the output end of the fine adjustment control module is connected with the control end of the electric control optical fiber expansion piece, the input end of the fine adjustment control module is connected with the output end of the MCU processing module, the input end of the optical switch control module is connected with the output end of the MCU processing module, and the output end of the optical switch control module is connected.
3. The adaptive high-precision optical fiber delay system according to claim 1, wherein: the optical modulation circuit comprises a first photoelectric conversion module, a second photoelectric conversion module, a reference signal generation module and a wavelength division multiplexer; the output ends of the first photoelectric conversion module and the second photoelectric conversion module are connected with the input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is the output end of the light adjusting circuit, the input end of the first photoelectric conversion module is connected with a radio frequency input signal, and the input end of the second photoelectric conversion module is electrically connected with the output end of the reference signal generating module.
4. The adaptive high-precision optical fiber delay system according to claim 2, wherein: the light demodulation circuit comprises a wavelength division demultiplexer, a third photoelectric conversion module, a fourth photoelectric conversion module and a radio frequency amplifier, wherein the input end of the wavelength division demultiplexer is the input end of the light demodulation circuit, one output end of the light demodulation circuit is connected with the input end of the third photoelectric conversion module, the other output end of the light demodulation circuit is connected with the input end of the fourth photoelectric conversion module, and the output end of the third photoelectric conversion module is connected with the radio frequency output end through the radio frequency amplifier.
5. The adaptive high-precision optical fiber delay system according to claim 4, wherein: the optical fiber delay circuit further comprises a delay comparison module, two input ends of the delay comparison module are respectively connected with the output ends of the second photoelectric conversion module and the reference signal generation module, and the output end of the delay comparison module is connected with the input end of the MCU processing module.
6. The adaptive high-precision optical fiber delay system according to claim 2, wherein: the optical fiber stepping adjustable time delay module is formed by connecting a plurality of optical switches in series.
7. The adaptive high-precision optical fiber delay system according to claim 2, wherein: the optical fiber delay circuit further comprises a delay instruction input module and a delay display module which are connected with the MCU processing module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868252A (en) * | 2019-12-18 | 2020-03-06 | 中国电子科技集团公司第四十三研究所 | Self-adaptive high-precision optical fiber delay system |
| CN113376753A (en) * | 2021-06-18 | 2021-09-10 | 中国电子科技集团公司第三十四研究所 | Multi-order cascade optical signal delay amount adjustable delay device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868252A (en) * | 2019-12-18 | 2020-03-06 | 中国电子科技集团公司第四十三研究所 | Self-adaptive high-precision optical fiber delay system |
| CN113376753A (en) * | 2021-06-18 | 2021-09-10 | 中国电子科技集团公司第三十四研究所 | Multi-order cascade optical signal delay amount adjustable delay device |
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