CN110702263B - Temperature measuring device and method for large-core-diameter multimode optical fiber - Google Patents
Temperature measuring device and method for large-core-diameter multimode optical fiber Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 169
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- 238000009529 body temperature measurement Methods 0.000 claims description 16
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The embodiment of the invention discloses a temperature measuring device and a temperature measuring method for a large-core-diameter multimode optical fiber, which are characterized in that the device comprises: a swept source for providing linear swept light having a center wavelength of 1550nm to the device; the first optical fiber coupler is used for dividing the linear sweep frequency light into a first sweep frequency light signal and a second sweep frequency light signal; the auxiliary interference module is used for receiving the first sweep frequency optical signal to generate a clock signal; the main interference module receives the second sweep frequency optical signal to generate a beat frequency interference signal; the data acquisition module receives the clock signal and the beat interference signal and outputs the signals to the data processing module; and the data processing module is used for generating temperature data of the large-core multi-mode optical fiber based on the signals received by the data acquisition module. Therefore, the temperature of the large-core-diameter multimode optical fiber is simply and quickly measured, the measurement efficiency is greatly improved, and the measurement cost is reduced.
Description
Technical Field
The embodiment of the invention relates to the field of optical fiber sensing, in particular to a temperature measuring method and device for a large-core-diameter multimode optical fiber for measuring the temperature of a large-core-diameter special multimode energy optical fiber.
Background
Along with the continuous progress of energy photoelectron technology, various novel high-power lasers and laser processing equipment are continuously emerging, and the mode that laser equipment outputs laser by adopting optical fibers has replaced the traditional output mode, especially the energy transmission optical fibers and the external members thereof are also increasingly demanded. The energy optical fiber has excellent characteristics, so that the energy optical fiber has good application in the high-power light energy transmission field, such as laser transmission, laser coupling, laser welding, laser cutting, laser medical field and the like.
In the laser transmission field, the special multimode energy-transmitting optical fiber with large core diameter can be used as an output optical fiber of a laser, long-distance energy transmission can be realized, and meanwhile, whether the high-power energy signal can raise the internal temperature of the optical fiber or not needs to be considered when the high-power energy signal is transmitted, so that the structural characteristics of the optical fiber are affected, for example, the optical fiber coating layer can absorb the transmitted energy, or the transmitted high-power signal can cause local overhigh temperature at the bending part of the optical fiber, the structural failure of the optical fiber is caused, and the like. Therefore, the detection of the temperature of the large-core-diameter energy-transfer optical fiber is particularly important, and early warning of structural damage can be realized by detecting the temperature index reflecting the structural health state.
However, the inventor finds that in the process of implementing the present invention, some existing optical fiber temperature measurement technologies are all constructed based on single-mode optical fibers, and how to efficiently perform temperature measurement for large-core multimode optical fibers is a problem to be solved.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a temperature measurement method and device for a large-core-diameter multimode optical fiber, which solve the temperature measurement problem of a large-core-diameter characteristic multimode energy optical fiber.
In a first aspect, an embodiment of the present invention provides a temperature measurement device for a large-core multimode optical fiber, including:
a swept source operable to provide linear swept light having a center wavelength of 1550nm for the device;
the first optical fiber coupler can be used for dividing the linear sweep frequency light into a first sweep frequency light signal and a second sweep frequency light signal;
the auxiliary interference module can receive the first sweep frequency optical signal to generate a clock signal;
the main interference module can receive the second sweep frequency optical signal to generate a beat frequency interference signal;
the data acquisition module can receive the clock signal and the beat interference signal and output the signals to the data processing module;
and the data processing module can generate temperature data of the large-core multi-mode optical fiber based on the signals received by the data acquisition module.
Optionally, the main interferometer may include:
the system comprises a second optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a third optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein:
the second optical fiber coupler divides the second sweep frequency optical signal into two paths, wherein one path of the second sweep frequency optical signal obtains a reference arm signal through the polarization controller and enters the third optical fiber coupler; the other path obtains a signal arm signal through a first port of the large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are mutually orthogonal, and outputs the first optical signal and the second optical signal to the photoelectric detector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module.
Optionally, the pattern matcher may include:
a first stage pattern matcher and a second stage pattern matcher connected in series with each other; wherein:
the input end of the first-stage mode matcher is connected with 105 mu m/125 mu m special multimode optical fibers, and the output end of the first-stage mode matcher is connected with 62.5 mu m/125 mu m multimode optical fibers;
and the input end of the second-stage pattern matcher is connected with the 62.5 mu m/125 mu m multimode optical fiber, and the output end of the second-stage pattern matcher is connected with a 10 mu m/125 mu m single mode optical fiber.
Alternatively, the optical fiber to be measured may include a large core multimode energy-transfer optical fiber.
Alternatively, the auxiliary interference module may comprise a Mach-Zehnder interferometer.
According to the temperature measuring device for the large-core-diameter multimode optical fiber, provided by the invention, the OFDR technology is utilized, so that the temperature measurement can be effectively carried out on the large-core-diameter special multimode energy-transmitting optical fiber, and the measurement cost is greatly reduced while the application of the OFDR technology is expanded.
In a second aspect, an embodiment of the present invention further provides a method for measuring temperature of a large-core multimode optical fiber, where the method may include:
providing linear sweep light with a center wavelength of 1550nm for the device by utilizing a sweep light source;
dividing the linear swept light into a first swept light signal and a second swept light signal with a first fiber coupler;
receiving the first sweep frequency optical signal by using an auxiliary interference module to generate a clock signal;
receiving the second sweep frequency optical signal by utilizing a main interference module to generate a beat frequency interference signal;
and receiving the clock signal and the beat interference signal by using a data acquisition module to generate temperature data of the large-core multi-mode optical fiber.
Optionally, the main interferometer may include:
the system comprises a second optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a third optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein:
the second optical fiber coupler divides the second sweep frequency optical signal into two paths, wherein one path of the second sweep frequency optical signal obtains a reference arm signal through the polarization controller and enters the third optical fiber coupler; the other path obtains a signal arm signal through a first port of the large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are mutually orthogonal, and outputs the first optical signal and the second optical signal to the photoelectric detector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module.
Optionally, the pattern matcher may include:
a first stage pattern matcher and a second stage pattern matcher connected in series with each other; wherein:
the input end of the first-stage mode matcher is connected with 105 mu m/125 mu m special multimode optical fibers, and the output end of the first-stage mode matcher is connected with 62.5 mu m/125 mu m multimode optical fibers;
and the input end of the second-stage pattern matcher is connected with the 62.5 mu m/125 mu m multimode optical fiber, and the output end of the second-stage pattern matcher is connected with a 10 mu m/125 mu m single mode optical fiber.
Alternatively, the optical fiber to be measured may include a large core multimode energy-transfer optical fiber.
Alternatively, the auxiliary interference module may comprise a Mach-Zehnder interferometer.
According to the temperature measurement method of the large-core-diameter multimode optical fiber, which is provided by the invention, the OFDR technology is utilized, so that the temperature measurement of the large-core-diameter special multimode energy-transmitting optical fiber can be effectively performed, and the measurement cost is greatly reduced while the application of the OFDR technology is expanded. Meanwhile, the problem of overlarge insertion loss when the large-core-diameter multimode optical fiber transmits optical signals to the small-core-diameter single-mode optical fiber is solved when the large-core-diameter multimode optical fiber performs temperature sensing.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a temperature measuring device for providing a large-core multimode optical fiber according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a temperature measuring device for a large-core multimode optical fiber according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a preferred multimode device portion of a temperature measurement device for a large core multimode optical fiber according to an embodiment of the invention.
Reference numerals:
1-scanning a light source; 2-an auxiliary interference module; 3-main interference module; a 4-DAQ data acquisition module; a 5-data processing module; a 6-Mach-Zehnder interferometer; 7-a first fiber coupler; 8-a second fiber coupler; 9-a polarization controller; 10-a third fiber coupler; 11-clock signal; a 12-pattern matcher; 13-a large core multimode circulator; 14-optical fiber to be measured: large core diameter multimode energy-transmitting optical fiber; 15-a polarizing beam splitter; 16-a photodetector;
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention aims to build a temperature measuring device based on a large-core-diameter special multimode energy-transmitting optical fiber, and is characterized in that key devices in a single-mode OFDR system are changed, the problem of overlarge insertion loss when optical signals are transmitted from the large-core-diameter multimode optical fiber to a small-core-diameter single-mode optical fiber when the large-core-diameter multimode optical fiber is subjected to temperature sensing is solved, and therefore the application scene of the OFDR system is expanded.
Fig. 1 shows a schematic structural diagram of a temperature measuring device of a large-core multimode optical fiber, and as shown in fig. 1, the whole system consists of four parts, namely a sweep frequency light source, an auxiliary interference module, a main interference module and a data acquisition module, wherein the auxiliary interferometer and the main interferometer can be Mach-Zehnder interferometers. The system comprises a data acquisition module, a main interferometer, a sweep frequency light source, a data processing module (e.g. PC) and a data processing module, wherein the sweep frequency light source provides linear sweep frequency light with the center wavelength of 1550nm for the system, the sweep frequency light is divided into two paths, one path enters the auxiliary interferometer to generate an external clock signal used by the data acquisition module, the other path enters the main interferometer to generate a beat frequency interference signal to be finally acquired by the data acquisition module, and finally the beat frequency interference signal is input into the data processing module (e.g. PC) to obtain temperature data through calculation.
FIG. 2 shows a more specific schematic structural diagram of a temperature measuring device of the large-core multimode optical fiber, the temperature measuring device comprising:
a swept source for providing linear swept light having a center wavelength of 1550nm to the device;
the first optical fiber coupler c1 is used for dividing the linear sweep frequency light into a first sweep frequency light signal and a second sweep frequency light signal; the two paths of sweep frequency optical signals respectively enter an auxiliary interference module (branch) and a main interference module (branch);
the auxiliary interference module is used for receiving the first sweep frequency optical signal to generate a clock signal; the first swept optical signal may be interfered by a mach-zehnder interferometer as an auxiliary interferometer to generate a clock signal;
the main interference module receives the second sweep frequency optical signal to generate a beat frequency interference signal;
when the second sweep frequency optical signal enters the main interference module, the first sweep frequency optical signal can be interfered by using the Mach-Zehnder interferometer as the main interferometer and then is input to the second optical fiber coupler c2; or directly inputting the second sweep frequency optical signal to the second optical fiber coupler c2;
the second optical fiber coupler c2 divides the second sweep frequency optical signal into two paths, wherein one path obtains a reference arm signal through a polarization controller and enters the third optical fiber coupler c3; the other path obtains a signal arm signal through a first port of a large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler c3; because of the optical frequency domain reflection OFDR effect, the rayleigh backscattering signal in the signal arm and the optical signal in the reference arm introduce time delay due to the optical path difference, so that the frequencies of the optical signals carried by the two paths of signals are different, and frequency mixing is performed in the third optical fiber coupler c 3.
After the mixed signal enters the polarization beam splitter, the mixed signal is divided into two paths of light S light and P light which are mutually orthogonal (so as to eliminate the influence caused by polarization fading effect), beat frequency interference occurs on the photosensitive surface of the photoelectric detector, and meanwhile, the photoelectric detector converts the interference light signal into an electric signal and inputs the electric signal into the data acquisition card to finish signal acquisition.
The DAQ data acquisition module can be, for example, a DAQ data acquisition card, receives the clock signal and the beat interference signal and outputs the signals to the data processing module;
the data processing module can be equipment with computing capability, such as a personal computer or a server, and the temperature data of the large-core multimode optical fiber can be obtained through calculation through a reservation algorithm based on the signal data received by the data acquisition module.
The temperature measuring device needs to perform 2 wavelength scans when performing temperature sensing. The reference data is once obtained, and the measurement data is again obtained when the temperature changes. The original data obtained by each scanning is the distribution of scattered light and reflected light on the whole sensing optical fiber length in the scanning wavelength range, so that the scattered light and the reflected light are converted into the distribution of scattered light and reflected light intensity along the optical fiber length through Fourier transformation, then the cross-correlation operation is carried out on the reference data and the measured data to obtain the change information of the Rayleigh scattering spectrum frequency shift, and the temperature change information on the whole section of the energy-transmitting optical fiber to be detected can be obtained because the frequency spectrum movement is caused by the external temperature change. By the method, the temperature data of the large-core multimode optical fiber can be effectively calculated.
The temperature measurement device for the large-core multi-mode optical fiber can efficiently and quickly realize temperature measurement of the large-core multi-mode optical fiber, has low system complexity, low cost and high efficiency, and simultaneously solves the problem of overlarge insertion loss when transmitting optical signals from the large-core multi-mode optical fiber to the small-core single-mode optical fiber when the large-core multi-mode optical fiber senses the temperature.
Preferably, fig. 3 shows a schematic structural diagram of a multimode device part of a temperature measuring device of a large-core multimode optical fiber, and we improve a mode matcher and use the mode matcher with two stages connected in series to perform mode conversion.
Referring to fig. 3, based on a large-core multimode energy-transfer optical fiber, we make an improvement on a single-mode OFDR system, wherein swept-frequency light enters a port of a large-core multimode circulator 1 from a single-mode optical fiber (when an optical signal is transmitted from a small-core single-mode optical fiber to a large-core multimode optical fiber, the insertion loss is extremely small and negligible), the swept-frequency light enters the large-core multimode energy-transfer optical fiber of an optical fiber to be tested through a port of the circulator 2, and meanwhile, the 2 port receives a rayleigh scattering signal returned by the optical fiber to be tested and outputs the rayleigh scattering signal through a port of the circulator 3. The Rayleigh scattering signal output at this time is transmitted in 105 μm/125 μm special multimode fiber, and can be connected into the single-mode coupler only by conversion through the mode matcher. Since the core diameter difference is too large when the 105 μm/125 μm special multimode optical fiber and the 10 μm/125 μm single mode optical fiber are directly matched, the insertion loss is too large, and therefore, a two-stage mode matcher is adopted: the first-stage mode matcher is 105 mu m/125 mu m special multimode fiber and changes 62.5 mu m/125 mu m, the second-stage mode matcher is 62.5 mu m/125 mu m and changes 10 mu m/125 mu m, and after the second-stage mode matcher passes through the two-stage mode matcher, rayleigh scattering signals are output by a single mode fiber and enter a single mode coupler. By adopting the mode that the large-core-diameter multimode circulator is directly connected with the energy-transmitting optical fiber to be detected and then converted and output by the two-stage mode matcher, the insertion loss of an optical signal from the large-core-diameter multimode optical fiber to the small-core-diameter single-mode optical fiber is reduced.
On the other hand, the invention provides a temperature measurement method of the large-core-diameter multimode optical fiber. As can be seen with reference to fig. 1-2, the method specifically comprises:
providing linear sweep light with a center wavelength of 1550nm for the device by utilizing a sweep light source;
dividing the linear swept light into a first swept light signal and a second swept light signal with a first fiber coupler; the two paths of sweep frequency optical signals respectively enter an auxiliary interference branch and a main interference branch;
receiving the first swept optical signal with an auxiliary interferometer to generate a clock signal; the first swept optical signal may be interfered by a mach-zehnder interferometer as an auxiliary interferometer to generate a clock signal;
receiving the second swept optical signal with a primary interferometer to generate a beat interference signal; when the second sweep frequency optical signal enters the main interference module, the first sweep frequency optical signal can be interfered by using the Mach-Zehnder interferometer as the main interferometer and then is input to the second optical fiber coupler c2; or directly inputting the second sweep frequency optical signal to the second optical fiber coupler c2;
the second optical fiber coupler c2 divides the second sweep frequency optical signal into two paths, wherein one path obtains a reference arm signal through a polarization controller and enters the third optical fiber coupler c3; the other path obtains a signal arm signal through a first port of a large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler c3; because of the optical frequency domain reflection OFDR technology, the rayleigh backscattering signal in the signal arm and the optical signal in the reference arm introduce time delay due to the optical path difference, so that the frequencies of the optical signals carried by the two paths of signals are different, and frequency mixing is performed in the third optical fiber coupler c 3.
After the mixed signal enters the polarization beam splitter, the mixed signal is divided into two paths of light S light and P light which are mutually orthogonal (so as to eliminate the influence caused by polarization fading effect), beat frequency interference occurs on the photosensitive surface of the photoelectric detector, and meanwhile, the photoelectric detector converts the interference light signal into an electric signal and is connected into a data acquisition card to finish signal acquisition.
And receiving the clock signal and the beat interference signal by using a data acquisition module to generate temperature data of the large-core multi-mode optical fiber.
This temperature measurement method requires 2 wavelength scans to be performed when temperature sensing is performed. The reference data is once obtained, and the measurement data is again obtained when the temperature changes. The original data obtained by each scanning is the distribution of scattered light and reflected light on the whole sensing optical fiber length in the scanning wavelength range, so that the scattered light and the reflected light are converted into the distribution of scattered light and reflected light intensity along the optical fiber length through Fourier transformation, then the cross-correlation operation is carried out on the reference data and the measured data to obtain the change information of the Rayleigh scattering spectrum frequency shift, and the temperature change information on the whole section of the energy-transmitting optical fiber to be detected can be obtained because the frequency spectrum movement is caused by the external temperature change. By the method, the temperature data of the large-core multimode optical fiber can be effectively calculated.
Referring to fig. 3, based on a large-core multimode energy-transfer optical fiber, we make an improvement on a single-mode OFDR system, wherein swept-frequency light enters a port of a large-core multimode circulator 1 from a single-mode optical fiber (when an optical signal is transmitted from a small-core single-mode optical fiber to the large-core multimode optical fiber, the insertion loss is extremely small and negligible), enters the large-core multimode energy-transfer optical fiber of an optical fiber to be tested through a port of the circulator 2, and meanwhile, the 2 port receives a rayleigh scattering signal returned by the optical fiber to be tested and outputs the rayleigh scattering signal through a port of the circulator 3. The Rayleigh scattering signal output at this time is transmitted in 105 μm/125 μm special multimode fiber, and can be connected into the single-mode coupler only by conversion through the mode matcher. Since the core diameter difference is too large when the 105 μm/125 μm special multimode optical fiber and the 10 μm/125 μm single mode optical fiber are directly matched, the insertion loss is too large, and therefore, a two-stage mode matcher is adopted: the first-stage mode matcher is 105 mu m/125 mu m special multimode fiber and changes 62.5 mu m/125 mu m, the second-stage mode matcher is 62.5 mu m/125 mu m and changes 10 mu m/125 mu m, and after the second-stage mode matcher passes through the two-stage mode matcher, rayleigh scattering signals are output by a single mode fiber and enter a single mode coupler. By adopting the mode that the large-core-diameter multimode circulator is directly connected with the energy-transmitting optical fiber to be detected and then converted and output by the two-stage mode matcher, the insertion loss of an optical signal from the large-core-diameter multimode optical fiber to the small-core-diameter single-mode optical fiber is reduced.
The temperature measurement device for the large-core multi-mode optical fiber can efficiently and quickly realize temperature measurement of the large-core multi-mode optical fiber, has low system complexity, low cost and high efficiency, and simultaneously solves the problem of overlarge insertion loss when transmitting optical signals from the large-core multi-mode optical fiber to the small-core single-mode optical fiber when the large-core multi-mode optical fiber senses the temperature.
The division of the modules in the above embodiments of the present invention is merely illustrative, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist alone physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules.
The electronic device of the embodiments of the present invention exists in a variety of forms including, but not limited to:
(1) A mobile communication device: such devices are characterized by mobile communication capabilities and are primarily aimed at providing voice, data communications. Such terminals include: smart phones (e.g., iPhone), multimedia phones, functional phones, and low-end phones, etc.
(2) Ultra mobile personal computer device: such devices are in the category of personal computers, having computing and processing functions, and generally also having mobile internet access characteristics. Such terminals include: PDA, MID, and UMPC devices, etc., such as iPad.
(3) Portable entertainment device: such devices may display and play multimedia content. The device comprises: audio, video players (e.g., iPod), palm game consoles, electronic books, and smart toys and portable car navigation devices.
(4) And (3) a server: the configuration of the server including the processor 1010, the hard disk, the memory, the system bus, and the like is similar to that of a general-purpose computer architecture, but since highly reliable services need to be provided, there is a high demand in terms of processing capability, stability, reliability, security, scalability, manageability, and the like.
(5) Other electronic devices with data interaction function.
The apparatus embodiments described above are merely illustrative, in which the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Embodiments of the present invention provide a non-transitory computer readable storage medium storing program instructions for performing the methods and steps of the method embodiments described above when the program instructions are executed by an electronic device.
Embodiments of the present invention provide a computer program product, wherein the computer program product comprises a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by an electronic device, cause the electronic device to perform the method of any of the method embodiments described above.
The functional modules in the embodiments of the present invention may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer apparatus (which may be a personal computer, a server, or a network apparatus, etc.) or a smart terminal device or a Processor (Processor) to perform part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the foregoing embodiments of the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the present invention may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the invention are directly or indirectly applied to other related technical fields, and are also within the scope of the invention.
Claims (2)
1. A temperature measurement device for a large core multimode optical fiber, the device comprising: a swept source for providing linear swept light having a center wavelength of 1550nm to the device;
the first optical fiber coupler is used for dividing the linear sweep frequency light into a first sweep frequency light signal and a second sweep frequency light signal;
the auxiliary interference module is used for receiving the first sweep frequency optical signal to generate a clock signal;
the main interference module receives the second sweep frequency optical signal to generate a beat frequency interference signal;
the data acquisition module receives the clock signal and the beat interference signal and outputs the signals to the data processing module;
the data processing module is used for generating temperature data of the large-core multi-mode optical fiber based on the signals received by the data acquisition module;
wherein, the main interference module includes: the system comprises a second optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a third optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein: the second optical fiber coupler divides the second sweep frequency optical signal into two paths, wherein one path of the second sweep frequency optical signal obtains a reference arm signal through the polarization controller and enters the third optical fiber coupler; the other path obtains a signal arm signal through a first port of the large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are mutually orthogonal, and outputs the first optical signal and the second optical signal to the photoelectric detector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module;
wherein the pattern matcher includes: a first stage pattern matcher and a second stage pattern matcher connected in series with each other; wherein: the input end of the first-stage mode matcher is connected with 105 mu m/125 mu m special multimode optical fibers, and the output end of the first-stage mode matcher is connected with 62.5 mu m/125 mu m multimode optical fibers;
the input end of the second-stage pattern matcher is connected with the 62.5 mu m/125 mu m multimode optical fiber, and the output end of the second-stage pattern matcher is connected with a 10 mu m/125 mu m single mode optical fiber;
the optical fiber to be tested comprises a large-core-diameter multimode energy-transmitting optical fiber;
the auxiliary interference module includes a Mach-Zehnder interferometer.
2. A method for measuring temperature of a large core multimode optical fiber, the method comprising:
providing linear sweep light with a center wavelength of 1550nm for the temperature measuring device of claim 1 by using a sweep light source;
dividing the linear swept light into a first swept light signal and a second swept light signal with a first fiber coupler;
receiving the first sweep frequency optical signal by using an auxiliary interference module to generate a clock signal;
receiving the second sweep frequency optical signal by utilizing a main interference module to generate a beat frequency interference signal;
receiving the clock signal and the beat frequency interference signal by utilizing a data acquisition module to generate temperature data of the large-core multi-mode optical fiber;
wherein, the main interference module includes: the system comprises a second optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a third optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein: the second optical fiber coupler divides the second sweep frequency optical signal into two paths, wherein one path of the second sweep frequency optical signal obtains a reference arm signal through the polarization controller and enters the third optical fiber coupler; the other path obtains a signal arm signal through a first port of the large-core-diameter multimode circulator, the optical fiber to be tested, a second port of the large-core-diameter multimode circulator, a third port of the large-core-diameter multimode circulator and the mode matcher, and the signal arm signal enters the third optical fiber coupler;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are mutually orthogonal, and outputs the first optical signal and the second optical signal to the photoelectric detector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module;
wherein the pattern matcher includes: a first stage pattern matcher and a second stage pattern matcher connected in series with each other; wherein: the input end of the first-stage mode matcher is connected with 105 mu m/125 mu m special multimode optical fibers, and the output end of the first-stage mode matcher is connected with 62.5 mu m/125 mu m multimode optical fibers;
and the input end of the second-stage pattern matcher is connected with the 62.5 mu m/125 mu m multimode optical fiber, and the output end of the second-stage pattern matcher is connected with a 10 mu m/125 mu m single mode optical fiber.
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