CN217818787U - Portable optical fiber sensing network device capable of realizing wireless access - Google Patents
Portable optical fiber sensing network device capable of realizing wireless access Download PDFInfo
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- CN217818787U CN217818787U CN202221549002.2U CN202221549002U CN217818787U CN 217818787 U CN217818787 U CN 217818787U CN 202221549002 U CN202221549002 U CN 202221549002U CN 217818787 U CN217818787 U CN 217818787U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The utility model relates to a but portable wireless access's optic fibre sensing network device, it includes: a plurality of time division multiplexing branches with a plurality of output channels; a plurality of on-line Mach-Zehnder interferometer sensors connected to each time division multiplexing arm; a portable demodulation unit. The utility model discloses a to the networked operation of optic fibre at line type mach zehnder interferometer sensor, make its demodulation resolution ratio and demodulation speed all be higher than prior art because of adopting microwave photon filtering technique simultaneously. And the utility model provides a multiple sensing signal access mode makes the applied scene of system can expand. Furthermore the utility model discloses combine time division multiplex technique, not only expand sensor capacity, can also diagnose sensor network's fault point.
Description
Technical Field
The utility model relates to an optical fiber sensing technical field especially relates to a but portable wireless access's optical fiber sensing network device.
Background
In view of the advantages of small size, light weight, electromagnetic interference resistance, environmental corrosion resistance, etc., optical fiber sensors are increasingly used in devices. However, due to the limitation of hardware of the spectrum analyzer, the optical domain demodulation signals obtained by such systems have relatively low resolution and the demodulation speed does not meet the corresponding requirements, so that the systems are difficult to popularize and apply in some high-resolution demand scenarios.
Meanwhile, in the optical fiber sensor device, the signal transmission and demodulation processes are various and difficult to automatically regulate and control, and the automatic operation of the system is greatly influenced by manpower in most application scenes. In the existing scheme, the mode of the optical signal entering the demodulation unit is limited to the mode of wired access, which not only generates excessive limitations and influences the portability of the whole device.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a portable wireless accessible optical fiber sensor network device, which solves the technical problems of the prior art, such as weak ability to resist environmental disturbance, poor demodulation resolution and demodulation speed, limited demodulation access mode, and incapability of supporting networked operation.
(II) technical scheme
In order to achieve the above object, the utility model discloses a main technical scheme include:
in a first aspect, an embodiment of the present invention provides a portable wireless accessible optical fiber sensor network device, including:
a plurality of time division multiplexing branches with a plurality of output channels;
a plurality of on-line Mach-Zehnder interferometer sensors connected to each time-division multiplexing arm;
and a portable demodulation unit which accesses the summary signal of the output signals of all the on-line Mach-Zehnder interferometer sensors in a wireless or wired mode and demodulates the summary signal.
Optionally, the method further comprises: the broadband light source and the input optical fiber coupler are arranged at the front end of each time division multiplexing branch;
the input optical fiber coupler is used for dividing the broadband light source into a plurality of branches and transmitting the branches to each time division multiplexing branch.
Alternatively, the first and second liquid crystal display panels may be,
each time division multiplexing branch comprises: the optical amplifier, the channel selection electric control optical switch and the plurality of output channels are connected in sequence;
the optical amplifier is used for amplifying an incoming optical signal;
and the electric control optical switch is used for selecting a corresponding output channel according to a control instruction of the network on-line control end.
Optionally, the on-line mach-zehnder interferometer sensor comprises: a plurality of sensor subunits operating in a parallel multiplexing mode and an output optical fiber coupler connecting output ends of all the sensor subunits.
Optionally, there is provided between the on-line mach-zehnder interferometer sensor and the portable demodulation unit: the optical fiber coupler for gathering, the access selection electric control switch, the wired transmission path and the wireless transmission path are sequentially connected;
the optical fiber couplers for collection are connected with the output ends of all the optical fiber couplers for output;
the access selection electric control switch is used for selecting one of a wireless transmission path and a wired transmission path as an access mode of the portable demodulation unit according to a control instruction of the network online control end;
the wired transmission path is as follows: a path formed by a first output port of the access selection electric control switch, a transmission optical fiber and an optical fiber collimator which are connected in sequence;
the wireless transmission path includes: and selecting a path from the second output port of the electrically controlled switch to the portable demodulation unit by the access.
Optionally, the optical fiber sensor network device further includes: and the network online control end is connected with the portable demodulation unit.
Optionally, the portable demodulation unit comprises: the system comprises an optical fiber coupler for access, an electro-optic intensity modulator, an optical fiber dispersion unit, a photoelectric detector and a vector network analyzer which are sequentially connected;
the first port and the second port of the access optical fiber coupler are respectively used for receiving the optical signal transmitted by the wired transmission path and the optical signal transmitted by the wireless transmission path;
the electro-optical intensity modulator is used for modulating an output optical signal of the optical fiber coupler for access and transmitting the output optical signal to the optical fiber dispersion unit;
the optical fiber dispersion unit is used for mapping and converting the modulated optical signal from wavelength to time and transmitting the modulated optical signal to the photoelectric detector;
the photoelectric detector is used for converting the mapped signals into electric signals and inputting the electric signals into the vector network analyzer;
and the vector network analyzer is used for measuring and obtaining frequency response information according to the electric signal and sending the frequency response information to the network online control end.
Optionally, the portable demodulation unit further comprises: a light focusing and collimating unit arranged at the front end of the optical fiber coupler for access;
the light focusing and collimating unit is used for focusing and collimating the received optical signal sent by the optical fiber collimator of the wired transmission path and sending the optical signal to the first port of the access optical fiber coupler.
Optionally, the vector network analyzer is further connected to an electro-optical intensity modulator, and outputs a frequency-sweep microwave signal to the electro-optical intensity modulator to control a modulation parameter of the electro-optical intensity modulator.
Optionally, the network online control end includes: the time sequence generation controller and the computer are respectively connected with the time sequence generation controller and the vector network analyzer;
and the computer is used for controlling the time sequence generation controller to send out corresponding time sequence data according to the received frequency response signal obtained by the vector network analyzer so as to realize the selection of the output channel of each time division multiplexing branch and the control of the wireless or wired mode of the summary signal entering the portable demodulation unit.
(III) advantageous effects
The utility model realizes the network operation of the optical fiber on-line Mach Zehnder interferometer sensor; the optical fiber on-line Mach-Zehnder interferometer sensor has the advantages of compact structure and better environmental disturbance resistance compared with a traditional MZI interferometer constructed by two independent optical paths.
The utility model discloses a microwave photon filtering technique demodulates optic fibre mach zehnder interferometer sensor at the line type, can realize being higher than the demodulation resolution ratio and the demodulation speed of current spectral analyser measuring method.
And simultaneously, the utility model provides a system supports two kinds of sensor signal access modes of space optical coupling wireless access, the wired access of optic fibre for the applied scene of system can be extended: the traditional sensing system is connected in a wired mode, but in some application scenarios where cables are difficult to connect or wiring is difficult, the traditional sensing demodulation mode is limited. Therefore, the system has wider application scenes compared with the traditional sensing system. Furthermore, the utility model discloses utilize time division multiplexing technique, not only expanded on the biggest sensor capacity.
Drawings
Fig. 1 is a schematic diagram illustrating a portable wirelessly accessible optical fiber sensor network device according to an embodiment of the present invention.
[ instruction of reference ]
1: a broadband power supply; 2: an input optical fiber coupler; 3: a first optical amplifier; 4: a second optical amplifier; 5: a first channel selection electrically controlled optical switch; 501-50M: a first output channel number; 6: the second channel selects the electric control photoswitch; 601-60M: a second output channel number; 7: a timing generation controller: 8: a first in-line mach-zehnder interferometer sensor; 9: a second in-line mach-zehnder interferometer sensor; 10: a first output optical fiber coupler; 11: a second output optical fiber coupler; 12: a fiber coupler for collection; 1201: a first fiber optic path; 1202: a second fiber optic path; 1203: an output optical path; 13: connecting a selection electric control switch; 1301: a transmission optical fiber; 1302: an output optical fiber; 14: a fiber collimator; 15: a portable demodulation unit; 150101: a light focusing unit; 150102: an optical fiber collimating unit; 1502: an optical fiber coupler for access; 150201: a wired access port; 150202: a wireless access port; 1503: an electro-optical intensity modulator; 1504: an optical fiber dispersion unit; 1505: a photodetector; 1506: a vector network analyzer; 1507: and (4) a computer.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a portable wireless accessible optical fiber sensor network device, including: a plurality of time division multiplexing branches with a plurality of output channels; a plurality of on-line Mach-Zehnder interferometer sensors connected to each time division multiplexing arm; and a portable demodulation unit for accessing and demodulating the summary signal of the output signals of all the on-line Mach-Zehnder interferometer sensors in a wireless or wired mode.
Based on above-mentioned system, the utility model discloses a specially to the networked operation of optic fibre on-line type mach zehnder interferometer sensor, optic fibre on-line type mach zehnder interferometer sensor that proposes have compact structure, compare in the ability of the better anti environmental disturbance of traditional MZI interferometer of being built by two independent light paths.
In view of the fact that the minimum resolution of the traditional spectrometer demodulation scheme is severely limited by the wavelength resolution of the spectrometer demodulator, the resolution of the common commercial OSA is 0.01-0.02 nm, and when two optical signals are 0.001nm, the existing spectrometer cannot be distinguished and cannot measure the signals; however, if the wavelength difference of 0.001nm is correspondingly converted into the frequency difference of 125MHz, the frequency difference can be easily distinguished in the electrical domain, so that the microwave signal is loaded on the optical signal, and is converted onto the microwave signal through the change of the optical signal, and finally the microwave signal is recovered, and the changed frequency difference is obtained, thereby greatly improving the resolution. The essence of this high resolution is to take advantage of the large frequency difference between the optical signal frequency and the microwave signal frequency (optical signals are in the order of hundreds of THz, microwave signals 300MHz to 300 GHz), so any small wavelength variation in the optical domain translates into large or significant frequency variations or fluctuations in the electrical domain. In addition, the demodulation speed of the spectrometer is very slow, the 100nm wavelength scanning range needs second-order time, and the microwave domain scanning time is ms-order. Therefore, the utility model discloses a microwave photon filtering technique demodulates optic fibre at line type mach zehnder interferometer sensor, can realize the demodulation resolution ratio and the demodulation speed that are higher than current spectral analysis appearance measuring method.
And simultaneously, the utility model provides a system supports two kinds of sensing signal access modes of space optical coupling wireless access, the wired access of optic fibre for the application scene of system can be extended: the traditional sensing system is connected in a wired mode, but in some application scenarios where cables are difficult to connect or wiring is difficult, the traditional sensing demodulation mode is limited. Therefore, the system has a wider application range compared with the traditional sensing system. Furthermore, the utility model discloses utilize time division multiplexing technique, expanded on the biggest sensor capacity.
For a better understanding of the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Further, the light sensor network system further includes: a broadband light source 1 and an input optical fiber coupler 2 which are arranged at the front end of each time division multiplexing branch; the input optical fiber coupler 2 is used for dividing the broadband light source into a plurality of branches and transmitting the branches to each time division multiplexing branch.
Further, each time division multiplexing tributary comprises: the optical amplifier, the channel selection electric control optical switch and the plurality of output channels are connected in sequence; the optical amplifier is used for amplifying an incoming optical signal; the electric control optical switch is used for selecting the corresponding output channel according to the control instruction of the network on-line control end.
Next, the on-line mach-zehnder interferometer sensor includes: a plurality of sensor subunits operating in a parallel multiplexing mode and an output optical fiber coupler connecting output ends of all the sensor subunits.
Then, between the line-type mach-zehnder interferometer sensor and the portable demodulation unit, there are further provided: a summary optical fiber coupler 12, an access selection electric control switch 13, a wired transmission path and a wireless transmission path which are connected in sequence; the collecting optical fiber coupler 12 is connected to the output ends of all the output optical fiber couplers; the access selection electric control switch 13 is used for selecting one of a wireless transmission path and a wired transmission path as an access mode of the portable demodulation unit according to a control instruction of the network online control end; the wired transmission path is: a path formed by a first output port of the access selection electric control switch 13, a transmission optical fiber and an optical fiber collimator which are connected in sequence; the wireless transmission path includes: the path from the second output port of the electrically controlled switch 13 to the portable demodulation unit is selected by the access.
And, the portable demodulation unit 15 includes: an access optical fiber coupler 1502, an electro-optical intensity modulator 1503, an optical fiber dispersion unit 1504, a photodetector 1505, and a vector network analyzer 1506, which are connected in this order; the first port and the second port of the optical fiber coupler 1502 for access are respectively used for receiving an optical signal transmitted by a wired transmission path and an optical signal transmitted by a wireless transmission path; the electro-optical intensity modulator 1503 is used for modulating the output optical signal of the optical fiber coupler 1502 for access and transmitting the output optical signal to the optical fiber dispersion unit 1504; the fiber dispersion unit 1504 is used for mapping and converting the modulated optical signal from wavelength to time, and transmitting the modulated optical signal to the photodetector 1505; the photodetector 1505 is used for converting the mapped signal into an electrical signal, and inputting the electrical signal to the vector network analyzer 1506; the vector network analyzer 1506 is configured to obtain frequency response information according to the electrical signal measurement, and send the frequency response information to the network online control end. Preferably, the vector network analyzer 1506 is further connected to the electro-optical intensity modulator 1503 and outputs a swept-frequency microwave signal to the electro-optical intensity modulator 1503 to control the modulation parameters of the electro-optical intensity modulator.
Further, the portable demodulation unit 15 further includes: a light focusing collimation unit arranged at the front end of the access optical fiber coupler; the light focusing and collimating unit is used for focusing and collimating the received optical signal sent by the optical fiber collimator of the wired transmission path and sending the optical signal to the first port of the optical fiber coupler for access. Specifically, the light focusing collimating unit includes: a light focusing unit 150101; a fiber collimation unit 150102.
Wherein, the network online control end includes: a timing generation controller 7 and a computer 1507 connected to the timing generation controller 7 and the vector network analyzer 1506, respectively; the computer 1507 is used for controlling the timing sequence generation controller 7 to send out corresponding timing sequence data according to the received frequency response signal obtained by the vector network analyzer 1506, so as to realize the selection of the output channel of each time division multiplexing branch and the control of the wireless or wired mode of the summarized signal entering the portable demodulation unit 15.
To sum up, the utility model discloses a but portable wireless access's optical fiber sensing network device, as shown in fig. 1 (the solid line represents light signal, the dotted line represents the signal of telecommunication in fig. 1), its concrete flow of realizing is: the broadband light source 1 sends out broadband light signals, the broadband light signals are input into an input optical fiber coupler 2, the input optical fiber coupler 2 divides the input light into N paths, 201 paths of light enter a first optical amplifier 3 (marked by A-1), and 20N paths of light enter a second optical amplifier 4 (marked by A-N); the light output by the first optical amplifier 3 enters a first channel selection electric control optical switch 5 (label OS-1), the first channel selection electric control optical switch 5 receives a control command of a time sequence generation controller 7 to select a corresponding output channel (the serial numbers of the output channels are respectively 501-50M), an optical signal output by the first channel selection electric control optical switch 5 enters a first online Mach-Zehnder interferometer sensor, the optical signal comprises M sensor subunits, and the corresponding serial numbers are respectively S-1-S-M; the optical signals output from the respective sensing subunits of the first in-line mach-zehnder interferometer sensor 8 are merged at the first output fiber coupler 10; the optical signal output by the second optical amplifier 4 enters a second channel selection electronic control optical switch 6 (label OS-N), the second channel selection electronic control optical switch 6 is controlled by the timing sequence generation controller 7 to select a corresponding output channel (the serial numbers of the output channels are 601 to 60M respectively), the optical signal output by the second channel selection electronic control optical switch 6 enters a second optical fiber on-line type mach-zehnder interferometer sensor 9, which also comprises M sensor subunits, and the corresponding serial numbers are S-1 to S-M respectively; the optical signals output from the respective sensor subunits of the second optical fiber on-line mach-zehnder interferometer sensor 9 are merged at the second output optical fiber coupler 11; then, the optical signals in the optical path of the sensing module finally pass through the first optical fiber optical path 1201 and the second optical fiber optical path 1202 respectively to be merged at the optical fiber coupler 12 for aggregation, and the merged optical signals are input to the access selection electronic control optical switch 13 through the output optical path 1203; the access selection electronic control optical switch 13 receives an instruction from the timing generation controller 7, and can select that an optical signal enters the portable demodulation unit 15 in a spatial light coupling wireless access mode, that is, the optical signal is input to the optical fiber collimator 14 through the transmission optical fiber 1301, the optical fiber collimator 14 sends the optical signal to the light focusing and collimating module 1501 in a wireless connection mode, wherein the spatial optical signal firstly passes through the light focusing unit 150101 and then passes through the optical fiber collimating unit 150102; the optical signal output by the electrically controlled optical switch 13 may also enter the portable demodulation unit by way of optical fiber wire connection, i.e. the optical signal is connected to another input port 150202 of the optical fiber coupler 1502 through the output optical fiber 1302; furthermore, an output optical signal from the access optical fiber coupler 1502 is firstly modulated by the electro-optical intensity modulator 1503, the modulated optical signal is subjected to wavelength-to-time mapping conversion by the optical fiber dispersion unit 1504, then the optical signal is converted into an electrical signal at the photoelectric detector 1505, the generated electrical signal is input into the vector network analyzer 1506, and the vector network analyzer 1506 outputs a sweep frequency microwave signal to the electro-optical intensity modulator 1503; therefore, the microwave photon filtering part in the system: the device comprises a broadband light source 1, an optical fiber coupler (2/10/11/12 and the like), optical amplifiers (A-1-A-N), electric control optical switches (OS-1-OS-N and 13), an optical fiber on-line Mach-Zehnder interferometer sensor module (8/9 and the like), an optical fiber collimator 14, a light focusing and collimating module 1501, an electro-optical intensity modulator 1503, a dimming fiber dispersion unit 1504 and a photoelectric detector 1505; the vector network analyzer 1506 here measures the frequency response of the microwave photonic filter system, and the measurement results are transmitted to the computer 1507 via the communication cable, while the computer terminal 1507 may send control commands to the vector network analyzer 1506 and the timing generation controller 7.
Because the system/apparatus described in the above embodiments of the present invention is the system/apparatus adopted for implementing the method of the above embodiments of the present invention, based on the method described in the above embodiments of the present invention, those skilled in the art can understand the specific structure and deformation of the system/apparatus, and therefore the description is omitted here. All systems/devices adopted by the method of the above embodiments of the present invention belong to the intended protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that, in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention should also be covered thereby.
Claims (10)
1. A portable, wirelessly accessible fiber optic sensor network device, comprising:
a plurality of time division multiplexing branches with a plurality of output channels;
a plurality of on-line Mach-Zehnder interferometer sensors connected to each time-division multiplexing arm;
and a portable demodulation unit for accessing and demodulating the summary signal of the output signals of all the on-line Mach-Zehnder interferometer sensors in a wireless or wired mode.
2. The portable wirelessly accessible fiber optic sensor network device of claim 1, further comprising: the broadband light source and the input optical fiber coupler are arranged at the front end of each time division multiplexing branch;
the input optical fiber coupler is used for dividing the broadband light source into a plurality of branches and transmitting the branches to each time division multiplexing branch.
3. A portable wireless-accessible fiber optic sensor network device according to claim 1, wherein each of said time division multiplexing branches comprises: the optical amplifier, the channel selection electric control optical switch and the plurality of output channels are connected in sequence;
the optical amplifier is used for amplifying an incoming optical signal;
and the electric control optical switch is used for switching on a corresponding output channel according to a control instruction of the network online control end.
4. The portable wirelessly accessible fiber optic sensor network device of claim 1, wherein the inline mach-zehnder interferometer sensor comprises: a plurality of sensor subunits operating in a parallel multiplexing mode and an output optical fiber coupler connecting output ends of all the sensor subunits.
5. The portable wirelessly accessible fiber optic sensor network device of claim 1, wherein disposed between the inline mach-zehnder interferometer sensor and the portable demodulation unit is: the optical fiber coupler for gathering, the access selection electric control switch, the wired transmission path and the wireless transmission path are sequentially connected;
the optical fiber coupler for collection is connected with the output ends of all the optical fiber couplers for output;
the access selection electric control switch is used for selecting one of a wireless transmission path and a wired transmission path as an access mode of the portable demodulation unit according to a control instruction of the network online control end;
the wired transmission path is as follows: a path formed by a first output port of the access selection electric control switch, a transmission optical fiber and an optical fiber collimator which are connected in sequence;
the wireless transmission path includes: and selecting a path from the second output port of the electrically controlled switch to the portable demodulation unit by the access.
6. The portable wirelessly accessible fiber optic sensor network device of claim 5, further comprising: and the network online control end is connected with the portable demodulation unit.
7. The portable wirelessly accessible fiber optic sensor network device of claim 6, wherein the portable demodulation unit comprises: the system comprises an optical fiber coupler for access, an electro-optic intensity modulator, an optical fiber dispersion unit, a photoelectric detector and a vector network analyzer which are sequentially connected;
the first port and the second port of the access optical fiber coupler are respectively used for receiving the optical signal transmitted by the wired transmission path and the optical signal transmitted by the wireless transmission path;
the electro-optical intensity modulator is used for modulating an output optical signal of the optical fiber coupler for access and transmitting the output optical signal to the optical fiber dispersion unit;
the optical fiber dispersion unit is used for mapping and converting the modulated optical signal from wavelength to time and transmitting the modulated optical signal to the photoelectric detector;
the photoelectric detector is used for converting the mapped signals into electric signals and inputting the electric signals into the vector network analyzer;
and the vector network analyzer is used for obtaining frequency response information according to the electric signal measurement and sending the frequency response information to the network online control end.
8. The portable wirelessly accessible fiber optic sensor network device of claim 7, wherein the portable demodulation unit further comprises: a light focusing collimation unit arranged at the front end of the access optical fiber coupler;
and the light focusing and collimating unit is used for focusing and collimating the received optical signal sent by the optical fiber collimator of the wired transmission path and sending the optical signal to the first port of the optical fiber coupler for access.
9. The portable wireless-accessible optical fiber sensor network device according to claim 7, wherein the vector network analyzer is further connected to an electro-optical intensity modulator, and outputs a swept-frequency microwave signal to the electro-optical intensity modulator to control the modulation parameters of the electro-optical intensity modulator.
10. The portable wirelessly accessible fiber optic sensor network device of claim 7, wherein the network presence control end comprises: the time sequence generation controller and the computer are respectively connected with the time sequence generation controller and the vector network analyzer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117073730A (en) * | 2023-10-17 | 2023-11-17 | 之江实验室 | Optical fiber sensing system and optical fiber sensing method based on microwave photons |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117073730A (en) * | 2023-10-17 | 2023-11-17 | 之江实验室 | Optical fiber sensing system and optical fiber sensing method based on microwave photons |
| CN117073730B (en) * | 2023-10-17 | 2024-01-26 | 之江实验室 | Optical fiber sensing system and optical fiber sensing method based on microwave photons |
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