CN112729598A - All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure - Google Patents
All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure Download PDFInfo
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- CN112729598A CN112729598A CN202011431429.8A CN202011431429A CN112729598A CN 112729598 A CN112729598 A CN 112729598A CN 202011431429 A CN202011431429 A CN 202011431429A CN 112729598 A CN112729598 A CN 112729598A
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- optical fiber
- interference structure
- sensing arm
- zehnder interference
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Optical Transform (AREA)
Abstract
The invention provides an optical fiber Mach-Zehnder interference structure based on a side grinding sensing arm structure, which adopts two optical fiber couplers to be oppositely welded to construct the optical fiber Mach-Zehnder interference structure, wherein a reference arm of the optical fiber Mach-Zehnder interference structure is a single-mode optical fiber, a sensing arm is a light leakage window polished on the single-mode optical fiber by applying a side grinding technology, the interference structure is simple in mechanism, and the sensitivity can be obviously improved when the optical fiber Mach-Zehnder interference structure is applied to a sensor.
Description
Technical Field
The invention relates to the field of optical fiber devices, in particular to an all-fiber Mach-Zehnder interference structure based on a side grinding sensing arm structure.
Background
Compared with other electric and chemical sensors in the traditional sense, the optical fiber sensor has the advantages of light weight, high sensitivity, electromagnetic interference resistance and the like, can measure various parameters such as temperature, humidity, refractive index, liquid level, strain, air pressure, displacement, magnetic field, curvature, disturbance and the like, and has wide application in the fields of electric power, chemical engineering, biomedical treatment, spectrum detection and the like; the optical fiber Mach-Zehnder sensor can realize temperature measurement at high temperature, has high response speed and high sensitivity, and is one of the research hotspots in the sensing field. The optical fiber Mach-Zehnder is suitable for researching the temperature sensing characteristics, but the optical fiber Mach-Zehnder sensor is complex in structure, low in sensitivity and low in contrast.
Disclosure of Invention
The invention provides an all-fiber Mach-Zehnder interference structure based on a side grinding sensing arm structure, aiming at solving the problems of complex structure, low sensitivity and low contrast of an optical fiber Mach-Zehnder sensor in the prior art, and the structure comprises:
the input end of the first coupler is connected with a signal source, the first output end of the first coupler is connected with the input end of the reference arm, the second output end of the first coupler is connected with the input end of the sensing arm, and the output end of the reference arm and the output end of the sensing arm are converged and connected with the input end of the second coupler;
the reference arm is a single mode fiber.
The sensing arm is a light leakage window structure manufactured by polishing a single-mode optical fiber by a side grinding method.
Further, the size of the light leakage window is: 20mm long and 50 μm deep.
Further, the first coupler and the second coupler are both 1 × 2 port 3dB optical fiber double couplers, and the splitting ratio is 50: 50.
Further, the time period of the polishing treatment was 5 hours.
Compared with the prior art, the invention has the advantages that:
the optical fiber Mach-Zehnder interference structure is constructed by oppositely welding two 1 multiplied by 2 port optical fiber couplers with the light splitting ratio of 50:50, wherein a reference arm of the optical fiber Mach-Zehnder interference structure is a single-mode optical fiber, a sensing arm is a light leakage window polished on the single-mode optical fiber by applying a side surface grinding technology, the interference structure is simple in mechanism, and the sensitivity can be remarkably improved when the optical fiber Mach-Zehnder interference structure is applied to a sensor.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a light leakage window;
FIG. 2 is a diagram of a system for temperature testing using an interferometric structure of an embodiment in a test example;
FIG. 3 is a graph showing the shift of the valley of the transmission spectrum measured at 25 to 60 ℃ in the test examples.
Description of reference numerals:
1-broadband light source, 2-first coupler, 3-first light beam, 4-second light beam, 5-reference arm, 6-single mode fiber, 7-sensing arm, 8-second coupler, 9-fiber sensing analyzer, 10-residual cladding, 11-fiber core and 12-cladding.
Detailed Description
The objects and functions of the present invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it may be embodied in different forms and the essence of the description is merely to assist those skilled in the relevant art in comprehensive understanding of the specific details of the invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps. An all-fiber Mach-Zehnder interference structure based on a side-grinding sensing arm structure according to the present invention is described below by way of specific examples:
examples
The embodiment provides an optical fiber Mach-Zehnder interference structure based on a side grinding sensing arm structure, wherein two optical fiber couplers in the structure are 3dB and 1 multiplied by 2 port optical fiber couplers with a splitting ratio of 50: 50;
taking a single-mode fiber with the length of 3m, wherein the fiber core/cladding size of the single-mode fiber is 9/125 mu m, polishing the single-mode fiber for 5h by applying a side grinding technology to prepare a light leakage window with the length of 20mm and the depth of 50 mu m, and intercepting the single-mode fiber with the light leakage window structure as a sensing arm 7 of a Mach-Zehnder interference structure;
and taking a single-mode optical fiber 6 as a reference arm 5 of a Mach-Zehnder interference structure.
Test examples
The temperature test is carried out on the optical fiber Mach-Zehnder interference structure in the embodiment, the structural diagram of the test system is shown in figure 2, the input end of a first coupler 2 of the optical fiber Mach-Zehnder interference structure is connected with a broadband light 1, the output end of a second coupler 8 is connected with an optical fiber sensing analyzer 9, when the broadband light source 1 emits an optical signal, the first coupler 2 divides the optical signal into two optical signals, namely a first light beam 3 and a second light beam 4, the first light beam 3 enters the reference arm 5, the second light beam 4 enters the sensing arm 7, the transmission spectrum is obtained by measuring the temperature change range of 25-60 ℃, the test result is shown in figure 3, and the result according to figure 3 can be seen, the interference fringes are red-shifted within the test range of 25-60 ℃, which shows that the sensitivity of the temperature sensor can be obviously improved by applying the optical fiber Mach-Zehnder interference structure provided in the embodiment to the temperature sensor.
Claims (4)
1. An optical fiber Mach-Zehnder interference structure based on a side grinding sensing arm structure is characterized by comprising: the input end of the first coupler is connected with a signal source, the first output end of the first coupler is connected with the input end of the reference arm, the second output end of the first coupler is connected with the input end of the sensing arm, and the output end of the reference arm and the output end of the sensing arm are converged and connected with the input end of the second coupler;
the reference arm is a single mode fiber.
The sensing arm is a light leakage window structure manufactured by polishing a single-mode optical fiber by a side grinding method.
2. The interference structure of claim 1, wherein the light leakage window has dimensions of: 20mm long and 50 μm deep.
3. The interference structure of claim 1, wherein the first and second couplers are each 1 x 2 port 3dB fiber twin couplers with a splitting ratio of 50: 50.
4. The interference structure of claim 2, wherein the polishing process is 5 hours in duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011431429.8A CN112729598A (en) | 2020-12-07 | 2020-12-07 | All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011431429.8A CN112729598A (en) | 2020-12-07 | 2020-12-07 | All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure |
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| Publication Number | Publication Date |
|---|---|
| CN112729598A true CN112729598A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011431429.8A Withdrawn CN112729598A (en) | 2020-12-07 | 2020-12-07 | All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure |
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| CN (1) | CN112729598A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813238A (en) * | 2010-04-20 | 2010-08-25 | 上海大学 | Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof |
| CN204964060U (en) * | 2015-08-03 | 2016-01-13 | 哈尔滨理工大学 | Temperature sensing device based on optic fibre mach -Zehnder that receives a little interferes |
-
2020
- 2020-12-07 CN CN202011431429.8A patent/CN112729598A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813238A (en) * | 2010-04-20 | 2010-08-25 | 上海大学 | Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof |
| CN204964060U (en) * | 2015-08-03 | 2016-01-13 | 哈尔滨理工大学 | Temperature sensing device based on optic fibre mach -Zehnder that receives a little interferes |
Non-Patent Citations (1)
| Title |
|---|
| 袁宏伟等: "基于侧边抛磨传感臂结构的光纤Mach-Zehnder温度传感特性研究", 《光学技术》 * |
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Application publication date: 20210430 |