CN210222288U - Single-cladding multi-core optical fiber with anomaly detection function - Google Patents
Single-cladding multi-core optical fiber with anomaly detection function Download PDFInfo
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- CN210222288U CN210222288U CN201921434869.1U CN201921434869U CN210222288U CN 210222288 U CN210222288 U CN 210222288U CN 201921434869 U CN201921434869 U CN 201921434869U CN 210222288 U CN210222288 U CN 210222288U
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Abstract
The utility model discloses a take single-cladding multicore optic fibre of unusual detection, single-cladding multicore optic fibre includes energy transmission fibre core, signal transmission fibre core and optical fiber cladding, energy transmission fibre core one end sets up first coupling lens to through the external illumination laser light source of first coupling lens, signal transmission fibre core one end sets up second coupling lens to through the external detection laser light source of second coupling lens, the signal transmission fibre core other end sets up signal return device, the external photoelectric detector of signal return device. The utility model has the advantages that: the utility model discloses an optic fibre has many fibre cores to pass the energy, and an at least optic fibre passes the signal, so has reduced the material of optic fibre covering on the one hand, and the cost is reduced, and many fibre cores pass the energy in the covering and have improved efficiency, have still reduced the sectional area of optical cable, and on the other hand this novel optic fibre is the fibre core of passing the signal in addition, is used for detecting leaded light optic fibre whether has the damage, guarantees whole lighting system ability normal operating.
Description
Technical Field
The utility model relates to a photoelectric conduction technical field, concretely relates to take single cladding multicore optic fibre of abnormal detection.
Background
With the improvement of the lighting demand of people, optical fiber light guide lighting is applied to more and more fields, but in a laser light guide lighting system, faults such as optical fiber quality degradation, burning or damage exist, the faults are the main problems influencing the normal operation of the optical fiber light guide lighting, in the current laser lighting system, most of the faults are that one laser corresponds to one optical fiber for lighting due to the limitation of laser power, in the practical application of the lighting mode, the actual lighting demand can not be met, a plurality of lasers are needed for a plurality of optical fibers to meet the lighting demand, but the cross section area of an optical cable is increased due to the large number of optical fibers, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a rational in infrastructure's a take many core optical fibers of single cladding of abnormal detection.
The technical scheme of the utility model as follows:
the single-cladding multi-core optical fiber with the anomaly detection function is characterized by comprising a multi-core optical fiber, wherein the multi-core optical fiber comprises at least one energy transmission fiber core, at least one signal transmission fiber core and an optical fiber cladding, a first coupling lens is arranged at one end of the energy transmission fiber core and is externally connected with a lighting laser light source through the first coupling lens, a second coupling lens is arranged at one end of the signal transmission fiber core and is externally connected with a detection laser light source through the second coupling lens, and a signal returning device is arranged at the other end of the signal transmission fiber core and is externally connected with a photoelectric detector through the signal returning device.
The single-cladding multi-core optical fiber with the anomaly detection function is characterized in that the number of the signal transmission fiber cores is two, and the two signal transmission fiber cores comprise a first signal transmission fiber core and a second signal transmission fiber core; the signal returning device comprises an optical fiber coupler, one end of the first signal transmission fiber core is provided with a second coupling lens, the other end of the first signal transmission fiber core is provided with the optical fiber coupler, one end of the second signal transmission fiber core is connected with the optical fiber coupler, and the other end of the second signal transmission fiber core is connected with an optical waveguide and is connected with the photoelectric detector through the optical waveguide.
The single-cladding multi-core optical fiber with the anomaly detection function is characterized in that one signal transmission fiber core is arranged and comprises a first signal transmission fiber core, and the signal returning device comprises a Bragg grating; and one end of the first signal transmission fiber core is provided with an optical fiber branching device and is simultaneously connected with the second coupling lens and the photoelectric detector through the optical fiber branching device, and the other end of the first signal transmission fiber core is provided with a Bragg grating.
The single-cladding multi-core optical fiber with the anomaly detection function is characterized in that the energy transmission fiber core adopts a multimode fiber core, and the signal transmission fiber core adopts a multimode fiber core or a single-mode fiber core.
The single-cladding multi-core optical fiber with the anomaly detection function is characterized in that 1-8 fiber cores are adopted for energy transmission, and 1-2 fiber cores are adopted for signal transmission.
The single-clad multi-core optical fiber with the abnormity detection function is characterized in that the light-passing sectional area of the multi-core optical fiber needs to satisfy the following requirements:
wherein r isiIs the radius of the ith core, rjIs the radius of the jth core, dijIs the distance between the ith, j core center axes, DiIs the distance from the outermost point of the core to the axis of the fiber, Δ is the minimum optical spacing, and N is the coreNumber, R is the fiber cladding diameter, s is the core cross-sectional area, siIs the cross-sectional area of the ith core.
The single-clad multi-core optical fiber with the abnormity detection function is characterized in that the illumination laser light source adopts a blue laser light source, and the detection laser light source adopts an infrared light source or a red light source.
The single-cladding multi-core optical fiber with the anomaly detection function is characterized in that the optical fiber coupler adopts a bent waveguide structure or a reflecting curved surface structure.
The utility model has the advantages that: the optical fiber has a plurality of fiber cores to transmit energy and at least one fiber core to transmit signals, so that the material of the optical fiber cladding is reduced on the one hand, the cost is reduced, the energy transmitted by the plurality of fiber cores in the cladding is improved, the sectional area of the optical cable is also reduced, on the other hand, the novel optical fiber also has the fiber core to transmit signals, and the photoelectric detector is used for detecting whether the light guide optical fiber is damaged or not, so that the normal operation of the whole lighting system is ensured.
Drawings
Fig. 1 is a schematic structural view of two signal transmission fiber cores according to the present invention;
fig. 2 is a schematic structural view of a signal transmission fiber core according to the present invention;
fig. 3 is a distribution diagram of one energy transmission fiber core and two signal transmission fiber cores according to the present invention;
fig. 4 is a diagram of a distribution of an energy transmission fiber core and a signal transmission fiber core according to the present invention;
fig. 5 is a distribution diagram of three energy transmission fiber cores and two signal transmission fiber cores in a circular optical fiber according to the present invention;
fig. 6 is a distribution diagram of three energy transmission fiber cores and one signal transmission fiber core in a circular optical fiber according to the present invention;
fig. 7 is a distribution diagram of eight energy transmission fiber cores and two signal transmission fiber cores according to the present invention;
in the figure: 1-an illumination laser light source, 2-a first coupling lens, 3-a detection laser light source, 4-a second coupling lens, 5-a multi-core fiber, 6-a fiber coupler, 7-an optical splitter, 8-a Bragg grating 9-an optical waveguide and 10-a photoelectric detector.
Detailed Description
The invention is further described with reference to the accompanying drawings.
During optic fibre leaded light function illumination need advances optic fibre with the luminous flux coupling of tile level for energy density in the optic fibre cross-section is very high, if the optic fibre defect or fracture arouse accidents such as burning easily, consequently for guarantee illumination safety, improves the utilization ratio of optic fibre, the utility model provides a novel optic fibre structure makes optic fibre both can the transmitted energy, can transmit signal again, the convenient trouble condition of in time understanding optic fibre.
As shown in fig. 1-2, the utility model discloses technical scheme product mainly includes illumination laser light source 1, first coupling lens 2, detection laser light source 3, second coupling lens 4, multicore optic fibre 5, fiber coupler 6, optical divider 7, bragg grating 8, optical waveguide 9 and photoelectric detector 10.
The illumination laser light source 1 is a 450nm blue laser light source;
the first coupling lens 2 is used for coupling the light for illumination emitted by the illumination laser light source 1 into the core of the multimode optical fiber;
the detection laser light source 3 is a non-blue light source such as infrared light, red light and the like;
the second coupling lens 4 is used for coupling the light emitted by the detection laser light source 3 into the first signal transmission core 53 for detection;
the multi-core fiber 5 is a novel fiber structure, including but not limited to an energy transmission core 51, a fiber cladding 52, a first signal transmission core 53 and/or a second signal transmission core 54, wherein the first signal transmission core 53 and the second signal transmission core 54 are single-mode or multi-mode fiber cores, and the first signal transmission core 53 and the second signal transmission core 54 are made in the fiber cladding 52, in the novel fiber structure, the energy transmission core 51 is used for transmitting energy, and the first signal transmission core 53 and/or the second signal transmission core 54 is used for transmitting feedback signals;
the optical fiber coupling device 6 includes a curved waveguide structure or a reflective curved structure, and is configured to connect the first signal transmission fiber core 53 and the second signal transmission fiber core 54 (i.e., to couple the signal light at the exit end of the first signal transmission fiber core 53 into the second signal transmission fiber core 54), so that the signal light can be transmitted to the coupling end of the multicore fiber 5 (i.e., the left end of the multicore fiber 5 in the drawing) through the second signal transmission fiber core 54;
the optical waveguide 9 is used for transmitting the signal light in the second signal transmission fiber core 54 to the photoelectric detector 10; the photodetector 10 is used to detect whether the optical fiber is faulty or not, and determine whether the optical fiber is faulty or not according to the detected intensity of the light transmitted back by the second signal transmission fiber core 54. The detected light intensity is small or significantly reduced in case of a malfunction.
The optical fiber branching unit 7 adopts a 2-by-2 optical fiber branching unit, and is used for coupling light which is emitted by the detection laser light source 3 and used for detection into the first signal transmission fiber core 53 from one port of the branching unit 7 through a second coupling lens, enabling monochromatic light which is reversely transmitted after being reflected by the Bragg grating 8 to be output from two ports in a ratio of 1:1 through the optical fiber branching unit 7, and enabling the monochromatic light which is output from the uncoupled port to be used for detection;
the bragg grating 8 is a narrow-band reflector arranged at the tail end of the first signal transmission fiber core 53 and used for reflecting the wide-spectrum light transmitted by the first signal transmission fiber core 53 back to a certain monochromatic light, and the central wavelength of the reflected monochromatic light is related to the grating period and the effective refractive index of the fiber core; then, the fault condition of the optical fiber is judged according to the monochromatic light intensity detected by the photoelectric detector;
example 1:
a single-cladding multi-core optical fiber with anomaly detection comprises an illumination laser light source 1, a first coupling lens 2, a detection laser light source 3, a second coupling lens 4, a multi-core optical fiber 5, an optical fiber coupler 6, an optical waveguide 9 and a photoelectric detector 10.
An illumination laser light source 1 of 450nm is coupled into an energy transmission core 51 of a multi-core optical fiber 5 through a first coupling lens 2 for illumination; the detection laser light source 3 is a non-blue light source such as infrared light, red light and the like; the detection laser light source 3 is coupled into the first signal transmission fiber core 53 through the second coupling lens 4 (the first signal transmission fiber core 53 and the second signal transmission fiber core 54 adopt a single-mode fiber with the diameter of 9 μm or a multimode fiber with the diameter of 62.5 μm) for detection; the novel optical fiber structure 5 comprises an energy transmission fiber core and a single multimode signal transmission fiber core, the multimode fiber cladding is adjustable and comprises 125/300 microns, and the optical fiber coupling device 6 is connected with the first signal transmission fiber core 53 and the second signal transmission fiber core 54, so that signal light in the second signal transmission fiber core 54 can be transmitted to a coupling end; and transmits the signal light in the second signal transmission core 54 to the photodetector 10 through the optical waveguide 9; the photodetector 10 is used for detecting the signal transmitted back by the second signal transmission fiber core 54 and determining whether the optical fiber has a fault.
Example 2: the device comprises an illumination laser light source 1, a first coupling lens 2, a detection laser light source 3, a second coupling lens 4, an optical fiber splitter 7, a multi-core optical fiber 5, a Bragg grating 8 and a photoelectric detector 10.
An illumination laser light source 1 is coupled into a core of a multimode optical fiber through a first coupling lens 2 for illumination; the detection laser light source 3 is a non-blue light source such as infrared light, red light and the like; the detection laser light source 3 is coupled into the first signal transmission core 53 of one port of the optical splitter 7 through the second coupling lens 4 for signal detection; the multi-core optical fiber 5 comprises a 50 mu m/62.5 mu m energy transmission multimode optical fiber core, a signal transmission 9 mu m single-mode optical fiber core or a 50 mu m/62.5 mu m multimode optical fiber core and an 125/300 mu m optical fiber cladding, in the novel optical fiber structure, the energy transmission fiber core 51 is used for transmitting energy, more than one energy transmission fiber core 51 is used for transmitting energy, and the first signal transmission fiber core 53 is used for transmitting a feedback signal; one port on the left side of the optical fiber branching device 7 is used for connecting the second coupling lens 4 and the first signal transmission fiber core, the other port on the left side is used for transmitting monochromatic light which is reflected by the Bragg grating 8 and then is reversely transmitted back to a photoelectric detector for detection, wherein the optical fiber branching device is output from the two ports in a ratio of 1:1, and one end of the two ports on the right side of the branching device is used for being connected with the first signal transmission fiber; the bragg grating 8 is a narrow-band mirror formed at the tail end of the first signal transmission fiber core 53, and is used for reflecting the wide-spectrum light transmitted from the first signal transmission fiber core 53 back to a certain monochromatic light; and the monochromatic light reversely transmitted back through the bragg grating 8 is output through the other port of the splitter and detected by a photoelectric detector 10.
The arrangement rule of the optical fibers meets the requirement that the fiber diameter is as large as possible under the condition that the diameter of a cladding is determined, so that the optical fibers have large light transmission capacity, but the fiber cores need to be independent and cannot influence each other, and the spacing between the fiber cores is over 10 wavelengths generally. The light-passing sectional area satisfies:
wherein r isiIs the radius of the ith core, rjIs the radius of the jth core, dijIs the distance between the ith, j core center axes, DiIs the distance from the outermost point of the fiber core to the axis of the fiber, Δ is the minimum optical spacing, N is the number of fiber cores, R is the cladding diameter of the fiber, s is the cross-sectional area of the fiber core, s is the cladding diameter of the fiberiIs the cross-sectional area of the ith core.
The distribution of the energy transmission core and the signal transmission core of the multi-core optical fiber 5 may include, but is not limited to:
the first fiber core distribution mode: as shown in fig. 3-4, the multi-core fiber 5 is a novel fiber with a core of 62.5 μm and a cladding of 125 μm, in which a 9 μm single-mode fiber is nested, and comprises: 1 multimode fiber core and 2 single mode fiber cores, for example, in the method of embodiment 1, 1 multimode fiber core is used for transmitting energy, and 2 single mode fiber cores are used for transmitting signals. If the mode of embodiment 2 is adopted, only one single-mode optical fiber core is needed to transmit signals. If two single-mode fiber cores of 9 microns are adopted for signal transmission, the distance between the fiber cladding and the circumscribed circle of the 1 multimode fiber core and the 2 single-mode fiber cores is 15 microns.
A second fiber core distribution mode: as shown in fig. 5-6, the fiber cladding R is determined to be 125 μm, the multimode fiber core is 3 cores, the single mode fiber core is not less than 1 core, in order to satisfy the mathematically largest possible light transmission area, each fiber core is optically independently distributed without being affected by evanescent waves, the minimum optical spacing of the multimode fiber is determined to be 5 μm, the distance between the central axes of the two fiber cores minus the radius of the two fiber cores is 5 μm, the core diameter 2R of the multimode fiber can be determined,
where Δ is 5, a is 5, and R is 125, the multimode fiber core can be determined to be 50 μm by the above formula, Δ is the minimum optical pitch, d is the distance between the central axes of the two cores, and a is d-2R.
Fiber core distribution mode three: as shown in fig. 7, the core of the multicore fiber 5 may be, but is not limited to, 62.5 μm core, 300 μm fiber cladding, where: 1) the multimode optical fiber cores are a plurality of cores, and the number of the optical fiber cores is determined according to the illumination requirement, wherein the multimode optical fiber cores are used for transmitting energy, at least one core is used for transmitting signals, and the number of the signals is determined according to the adopted embodiment 1 or embodiment 2. 2) The fiber core of the multimode optical fiber is used for transmitting energy, and the fiber core of the single-mode optical fiber is used for transmitting signals. The optical fiber cladding adopts 300 mu m, and the number of multimode optical fiber cores is not more than 8.
In summary, the second of the three core distributions is preferred in this embodiment.
Claims (8)
1. The single-cladding multi-core optical fiber with the abnormal detection function is characterized by comprising a multi-core optical fiber (5), wherein the multi-core optical fiber (5) comprises at least one energy transmission fiber core (51), at least one signal transmission fiber core and an optical fiber cladding (52), one end of the energy transmission fiber core (51) is provided with a first coupling lens (2), the energy transmission fiber core is externally connected with a lighting laser light source (1) through the first coupling lens (2), one end of the signal transmission fiber core is provided with a second coupling lens (4), the signal transmission fiber core is externally connected with a detection laser light source (3) through the second coupling lens (4), and the other end of the signal transmission fiber core is provided with a signal returning device and is externally connected with a photoelectric detector (10) through the.
2. The single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein two signal transmission cores are provided, including a first signal transmission core (53) and a second signal transmission core (54); the signal returning device comprises an optical fiber coupler (6), one end of the first signal transmission fiber core (53) is provided with the second coupling lens (4), the other end of the first signal transmission fiber core is provided with the optical fiber coupler (6), one end of the second signal transmission fiber core (54) is connected with the optical fiber coupler (6), the other end of the second signal transmission fiber core is provided with the optical waveguide connection (9), and the second signal transmission fiber core is connected with the photoelectric detector (10) through the optical waveguide (9).
3. Single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein said signal transmission core is provided with one, including a first signal transmission core (53), and said signal return means comprises a bragg grating (8); the optical fiber coupling device is characterized in that an optical fiber branching device (7) is arranged at one end of the first signal transmission fiber core (53), the first signal transmission fiber core is connected with the second coupling lens (4) and the photoelectric detector (10) through the optical fiber branching device (7), and the Bragg grating (8) is arranged at the other end of the first signal transmission fiber core (53).
4. The single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein the energy transmission core (51) is a multimode fiber core, and the signal transmission core is a multimode fiber core or a single-mode fiber core.
5. The single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein 1-8 energy transmission cores and 1-2 signal transmission cores are adopted.
6. The single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein the light-passing cross-sectional area of the multi-core optical fiber (5) is required to satisfy the following conditions:
wherein r isiIs the radius of the ith core, rjIs the radius of the jth core, dijIs the distance between the ith, j core center axes, DiIs the distance from the outermost point of the fiber core to the axis of the fiber, Δ is the minimum optical spacing, N is the number of fiber cores, R is the cladding diameter of the fiber, s is the cross-sectional area of the fiber core, s is the cladding diameter of the fiberiIs the cross-sectional area of the ith core.
7. The single-clad multi-core optical fiber with anomaly detection according to claim 1, wherein a blue laser light source is adopted as the illumination laser light source (1), and an infrared light or red light source is adopted as the detection laser light source (3).
8. The single-clad multi-core optical fiber with anomaly detection according to claim 2, wherein the optical fiber coupler (6) adopts a bent waveguide structure or a reflecting curved surface structure.
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| CN110426782A (en) * | 2019-08-31 | 2019-11-08 | 浙江工业大学 | A kind of single covering multi-core optical fiber with abnormality detection |
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