CN114199515A - Method for testing hydrogen loss aging of underground optical fiber - Google Patents
Method for testing hydrogen loss aging of underground optical fiber Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 159
- 239000013307 optical fiber Substances 0.000 title claims abstract description 137
- 230000032683 aging Effects 0.000 title claims abstract description 97
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 40
- 239000001257 hydrogen Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 170
- 230000003287 optical effect Effects 0.000 claims abstract description 112
- 239000006185 dispersion Substances 0.000 claims description 12
- 238000010998 test method Methods 0.000 claims description 10
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 230000004927 fusion Effects 0.000 claims description 7
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- -1 tungsten halogen Chemical class 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000012512 characterization method Methods 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 12
- 238000004891 communication Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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Abstract
The invention belongs to the technical field of optical fiber transmission loss testing, and relates to an underground optical fiber hydrogen loss aging testing method, which comprises the following steps: testing the optical power of the tail fiber to obtain an optical power value P1(ii) a Connecting the tail fiber with the bare fiber, and performing optical power test on the tail fiber connected with the bare fiber to obtain an optical power value P2(ii) a Obtaining the loss value delta Pa ═ P before the aging test1‑P2| the step of generating a new symbol; aging the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber to respectively obtain the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber3And P4(ii) a Obtaining the loss value delta Pb | -P after aging test3‑P4| the step of generating a new symbol; and obtaining the hydrogen loss aging result of the optical fiber by comparing the loss values before and after the aging test. The method widens the application range of the optical fiber aging loss test, reduces the limitation on aging experimental devices and optical fiber samples, improves the practicability of the existing optical fiber characterization method, and has very wide prospects.
Description
Technical Field
The invention relates to a hydrogen loss aging test method for an underground optical fiber, and belongs to the technical field of optical fiber transmission loss test.
Background
With the rapid development of modern network communication technology, optical fiber communication technology gradually becomes the main data transmission mode of modern network communication. Optical fiber cables have been widely used in various fields such as ocean, land, aviation, energy development, and the like. Compared with the traditional communication means, the wireless communication system has the advantages of wide transmission frequency, large communication capacity, high confidentiality, light weight, easiness in erection and transportation and the like.
Optical fiber transmission is a data and signal transmission means using an optical fiber (optical fiber) as a medium. The transmission loss of the optical fiber refers to the loss of the optical fiber caused by various factors such as the substance, the external environment, the transmission effect and the like in the use process. At present, it is known that, in a severe environment such as a marine corrosion environment, a corrosive gas environment, a low-temperature environment, a high-pressure environment, an external force influence, a solarization radiation environment, and the like, an optical fiber itself may generate a chemical structure change, which destroys the accuracy of the optical fiber for signal transmission, and thus, a light wave signal is lost. The transmission loss characteristics of optical fibers are one of the most important factors determining the transmission distance, transmission stability and reliability of an optical network.
In the field of oil and gas fields in China, the underground optical cable has extremely high application value, so that the oil field production becomes more efficient and reliable, and the underground optical cable has irreplaceable effects. However, researches show that the optical cable material can generate a hydrogen evolution phenomenon at high temperature, and hydrogen atoms are evolved to interact with the optical fiber material to destroy the material structure of the optical fiber, so that the transmission signal is unstable and the optical fiber fails. The problem of optical fiber transmission loss seriously restricts the service life of the underground optical cable and the accuracy of communication signals, and the application and research and development of the optical fiber cable in the underground environment are seriously limited. Therefore, in the construction and maintenance of the optical fiber communication network, a proper hydrogen loss aging test system and a matched optical fiber loss test representation means need to be established, so that the aging condition of the optical fiber is accurately controlled, and the application and research and development of the underground environment optical cable are broken through.
In the national standard GB/T15972.55-2009, part 55 of the optical fiber test methods Specification: in the method for measuring environmental properties and the test procedure hydrogen aging, test conditions are specified: the hydrogen partial pressure is 1kPa, the temperature is 65 +/-2 ℃, and the sample is placed for more than 16 h. The underground environment optical fiber is in a service condition of high temperature and high pressure, the service condition aging condition of the underground environment optical fiber cannot be judged under the national standard test condition, and the actual aging condition requirement has uncertainty.
In the national standard GB/T15972.40-2008, section 40 of the optical fiber test method Specification: in the transmission characteristic and optical characteristic measuring method and test procedure attenuation, the length of a sample is based on the test of the whole optical fiber, and the accurate attenuation data can be obtained only when the length is more than 3 km. When the length of the optical fiber sample is less than 6m, a dead zone exists in a back scattering method, the loss value of the optical fiber sample cannot be accurately measured, and the problem of limitation of the length of the optical fiber sample exists.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for testing hydrogen loss and aging of an underground optical fiber, which widens the application range of the optical fiber aging loss test, reduces the limitations on aging experimental devices and optical fiber samples, improves the practicability of the current optical fiber characterization method, and has a very broad prospect.
In order to achieve the purpose, the invention provides the following technical scheme: a hydrogen loss aging test method for an underground optical fiber comprises the following steps: testing the optical power of the tail fiber to obtain an optical power value P1(ii) a Connecting the tail fiber with the bare fiber, and performing optical power on the tail fiber connected with the bare fiberTesting to obtain optical power value P2(ii) a Obtaining the loss value delta Pa ═ P before the aging test1-P2| the step of generating a new symbol; aging the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber to respectively obtain the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber3And P4(ii) a Obtaining the loss value delta Pb | -P after aging test3-P4| the step of generating a new symbol; and obtaining the hydrogen loss aging result of the optical fiber by comparing the loss values before and after the aging test.
Further, the optical power test firstly keeps the test fracture of the sample to be tested clean, one end of the sample to be tested is connected with the light source, the other end of the sample to be tested is connected with the optical power meter, the sample to be tested is straightened and reversed in two directions for a plurality of times, the optical power value detected each time is obtained, and the average value of the optical power values is taken as the optical power value of the sample to be tested.
Further, the light source for the optical power test adopts a light source with stable radiation, the light source stably outputs optical signals with preset wavelength, preset mode and preset power, and the light source comprises a halogen tungsten lamp, a laser or a light emitting diode.
Further, the optical power test can be measured at one or more wavelengths, or within a predetermined wavelength range, with the test wavelength being determined by the light source and the optical power meter.
Further, the test wavelength is in the range of 800-1600nm, wherein the test wavelength of the multimode optical fiber is in the range of 850nm-1300nm, and the test wavelength of the single-mode optical fiber is in the range of 1310nm-1550 nm.
Further, the method for connecting the tail fiber and the bare fiber comprises the following steps: fusion splice, bare fiber quick couplers or adapters.
Further, the total pressure in the aging test is in the range of 2-50 MPa; the hydrogen partial pressure is in the range of 1-5 MPa; the temperature is in the range of 100-500 ℃; the standing time of the sample to be tested is 1-12 days.
Further, the optical fiber is a short distance optical fiber, and the length of the optical fiber is in the range of 1-5 m.
Further, the shortest length of the tail fiber is less than 5 m.
Further, the optical fiber comprises a multimode optical fiber and a single mode optical fiber, the multimode optical fiber comprises an OM1 optical fiber or an OM2/OM3 optical fiber; a single mode optical fiber includes: dispersion non-shifted single mode fiber, dispersion shifted fiber, cut-off wavelength shifted fiber, non-zero dispersion shifted fiber, low slope non-zero dispersion shifted fiber, or bend-resistant fiber.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention widens the application range of the optical fiber aging loss test, reduces the limitation to an aging experimental device and an optical fiber sample, improves the practicability of the current optical fiber characterization method, and has very wide prospect.
2. The method of the invention can be suitable for various service environments of the optical fiber in the current market, including but not limited to marine corrosion environment, corrosive gas environment, low temperature environment, high pressure environment and external force influence.
3. The invention reduces the loss caused by possible bending movement of the optical fiber by straightening the optical fiber, exchanging measurement for multiple times, keeping the instrument static and the like, greatly avoids the problem of large error of short-distance optical fiber test on the whole, and finally achieves the purpose of testing and characterizing the short-distance optical fiber.
Detailed Description
The present invention is described in detail by way of specific embodiments in order to better understand the technical direction of the present invention for those skilled in the art. It should be understood, however, that the detailed description is provided for a better understanding of the invention only and that they should not be taken as limiting the invention. In describing the present invention, it is to be understood that the terminology used is for the purpose of description only and is not intended to be indicative or implied of relative importance.
The invention relates to a hydrogen loss aging test method for an underground optical fiber, which adopts an insertion loss method and obtains a loss value by testing an optical fiber link by using a stable light source and an optical power meter for a short-distance optical fiber. Finally, the time dependence of the aging test on the optical fiber loss is analyzed by comparing the loss values before and after the aging test. The invention uses OTDR (Optical Time Domain Reflectometer) to verify that the loss error is within 0.05dBm, uses methods of straightening Optical fiber, exchanging measurement for multiple times, keeping the instrument static and the like to reduce the loss caused by bending movement of the Optical fiber, integrally avoids the problem of large error of short-distance Optical fiber test, and finally can obtain accurate loss value, thereby representing the aging condition. The technical solution of the present invention will be described in detail by the following examples.
Example one
The optical fiber comprises multimode fiber and single mode fiber, the multimode fiber comprises but is not limited to OM1 fiber (62.5/125um) or OM2/OM3 fiber (G.651 fiber); single mode optical fibers include, but are not limited to: dispersion non-shifted single mode fiber (g.652 fiber), dispersion shifted fiber (g.653 fiber), cut-off wavelength shifted fiber (g.654 fiber), non-zero dispersion shifted fiber (g.655 fiber), low slope non-zero dispersion shifted fiber (g.656 fiber), or bend tolerant fiber (g.657 fiber). The embodiment is designed for short-distance optical fibers, the length of an optical fiber sample for a hydrogen loss aging test is less than 10m, and the length of the optical fiber is preferably in the range of 1-5 m. The shortest length of the tail fiber is less than 5 m.
The embodiment relates to a hydrogen loss aging test method for an underground optical fiber, which comprises the following steps:
s1 optical power test is carried out to the tail fiber to obtain optical power value P1(dBm)；
S2, connecting the tail fiber with the bare fiber, and testing the optical power of the tail fiber connected with the bare fiber to obtain the optical power value P2(ii) a Obtaining the loss value delta Pa ═ P before the aging test1-P2∣；
S3, aging the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber to respectively obtain the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber3And P4；
S4 obtaining loss value delta Pb | -P after aging test3-P4∣；
S5, comparing the loss values before and after the aging test to obtain the hydrogen loss aging result of the optical fiber.
The optical power test adopts an insertion loss method, and the basic principle is to insert an element to be tested between a transmitter and a receiver, detect the optical power of an input port of the transmitter and the optical power of an output port of the receiver, and compare the optical power of the input port with the optical power of the output port to obtain the optical power value in the embodiment, wherein the unit of the optical power value is decibel (dB). In this embodiment, first, the test fracture of the sample to be tested is kept clean, one end of the sample to be tested is connected to the light source, the other end of the sample to be tested is connected to the optical power meter, the sample to be tested is straightened and reversed in two-way mode for 6 times, the optical power value detected each time is obtained, and the optical power values of 6 pigtails are obtained, and the average value of the optical power values is taken as the optical power value of the sample to be tested. The insertion loss method adopted in the embodiment can not damage the measured optical fiber or the terminal connector fixed on the end of the optical fiber, is more suitable for field measurement, and is mainly used for measuring the link optical cable. The optical fiber sample is the short distance optical fiber in this embodiment, and its loss is littleer than the long distance optical fiber, and this scheme reduces the loss that the probably crooked removal of optic fibre caused through straightening optic fibre, exchanging measurement many times, keeping methods such as instrument static, and the problem that the error that the short distance optical fiber test faced is big has greatly been avoided on the whole, finally reaches the purpose of testing the characterization to the short distance optical fiber.
In this embodiment, the sample to be tested may be the pigtail not connected to the bare fiber or the pigtail connected to the bare fiber, and since the samples are different, the optical power testing method is the same, and thus is not described in detail.
In this embodiment, the light source for the optical power test is a light source that can stably emit light, the light source stably outputs an optical signal with a predetermined wavelength, a predetermined pattern, and a predetermined power, the light source includes a halogen tungsten lamp, a laser, or a light emitting diode, and the light source may be other existing stable light sources, which is not limited herein. The appropriate light source may be selected depending on the type of measurement. The light source position, intensity and wavelength should remain stable during the measurement.
The optical power test can be measured at one or more wavelengths or within a predetermined wavelength range, the test wavelength being determined by the light source and the optical power meter. The test wavelength is in the range of 800-1600nm, wherein the test wavelength of the multimode optical fiber is in the range of 850nm-1300nm, and the test wavelength of the single-mode optical fiber is in the range of 1310nm-1550 nm.
In this embodiment, the connection method of the pigtail and the bare fiber includes, but is not limited to: fusion splice, bare fiber quick couplers or adapters. In the present embodiment, since the fusion loss is relatively minimum, it is preferable that the fusion apparatus is used to cut the pigtail and perform high-precision fusion with both sides of the bare fiber, and the fusion loss is verified by OTDR and controlled to be within 0.05 dBm.
In the embodiment, in the aging test, the total pressure, the hydrogen partial pressure, the temperature and the time of the test device can be adjusted according to different optical fiber types and service environments, wherein the total pressure is in the range of 2-50MPa, and the preferable range is 10-40 MPa; the hydrogen partial pressure is in the range of 1-5MPa, and the preferable range is 1-2 MPa; the temperature is in the range of 100-500 ℃, and the preferred range is 200-300 ℃; the standing time of the sample to be tested is 1-12 days, and the preferable range is 3-5 days.
The method in the embodiment can be suitable for various service environments of optical fibers in the current market, including but not limited to marine corrosion environments, corrosive gas environments, low-temperature environments, high-pressure environments and external force influences.
Example two
Based on the same inventive concept, the present embodiment describes the scheme in the first embodiment in detail through a practical case. In this embodiment, the measured optical fiber is a multimode optical fiber OM1, the sample length of the measured optical fiber is 10 meters, and the tail fiber length is 5 meters. The optical power test wavelengths were 1300nm and 850 nm.
S1, the optical power of the tail fiber is tested, the light source, the tested tail fiber and the optical power meter are kept static in the test process, the test is carried out in a dust-free environment as much as possible, and the tidiness of a test fracture is guaranteed. Straightening and bidirectional switching for 6 times, obtaining 6 tail fiber optical power values by testing, and taking the average value as a reference optical power value P1(dBm)；
S2, using a welding machine to cut the tail fiber and weld the two sides of the bare fiber with high precision, verifying the welding loss through OTDR, limiting the welding loss within 0.05dBm, carrying out optical power test on the tail fiber connected with the bare fiber, and similarly carrying out optical power test on the tail fiber connected with the bare fiberStraightening the tail fiber connected with the bare fiber, carrying out bidirectional test for 6 times to obtain 6 optical power values, and taking the average value as the optical power value P of the sample2(dBm), obtaining a loss value Δ Pa ═ P before the aging test1-P2∣；
S3, ageing the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber, and using a high-temperature high-pressure reaction kettle as a hydrogen loss ageing test device under the test conditions of total pressure of 30MPa, hydrogen partial pressure of 3MPa, temperature of 200 ℃ and sample standing time of 96 h. After the aging test, the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber are respectively obtained3And P4；
S4 obtaining loss value delta Pb | -P after aging test3-P4∣；
S5, comparing the loss values before and after the aging test to obtain the hydrogen loss aging result of the optical fiber.
Tables 1 and 2 show the loss values of the optical fiber under test before and after the aging test at optical power test wavelengths of 1300nm and 850nm, respectively. By comparing Δ Pa and Δ Pb at corresponding wavelengths, it can be determined that the loss of the measured optical fiber increases by 1.12dB at the wavelength of 1300nm and by 1.36dB at the wavelength of 850nm under the aging test condition.
TABLE 1 table of loss values of the optical fiber before aging test at optical power test wavelengths of 1300nm and 850nm
TABLE 2 table of loss values of the optical fiber after aging test at optical power test wavelengths of 1300nm and 850nm
EXAMPLE III
Based on the same inventive concept, the present embodiment describes the scheme in the first embodiment in detail through a practical case. In this embodiment, the measured optical fiber is a multimode optical fiber OM2, the sample length of the measured optical fiber is 10 meters, and the tail fiber length is 5 meters. The optical power test wavelengths were 1300nm and 850 nm.
S1, the optical power of the tail fiber is tested, the light source, the tested tail fiber and the optical power meter are kept static in the test process, the test is carried out in a dust-free environment as much as possible, and the tidiness of a test fracture is guaranteed. Straightening and bidirectional switching for 6 times, obtaining 6 tail fiber optical power values by testing, and taking the average value as a reference optical power value P1(dBm)；
S2, using a welding machine to cut the tail fiber and weld the two sides of the bare fiber with high precision, verifying the welding loss by OTDR, limiting the welding loss within 0.05dBm, carrying out optical power test on the tail fiber connected with the bare fiber, straightening the tail fiber connected with the bare fiber, carrying out bidirectional test 6 times to obtain 6 optical power values, averaging to obtain a sample optical power value P2(dBm), obtaining a loss value Δ Pa ═ P before the aging test1-P2∣；
S3, ageing the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber, and using a high-temperature high-pressure reaction kettle as a hydrogen loss ageing test device under the test conditions of total pressure of 20MPa, hydrogen partial pressure of 3MPa, temperature of 200 ℃ and sample standing time of 48 h. After the aging test, the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber are respectively obtained3And P4；
S4 obtaining loss value delta Pb | -P after aging test3-P4∣；
S5, comparing the loss values before and after the aging test to obtain the hydrogen loss aging result of the optical fiber.
Tables 3 and 4 show the loss values of the optical fiber under test before and after the aging test at optical power test wavelengths of 1300nm and 850nm, respectively. By comparing Δ Pa and Δ Pb at corresponding wavelengths, it can be determined that the loss of the measured optical fiber increases by 0.46dB at the wavelength of 1300nm and by 0.45dB at the wavelength of 850nm under the aging test condition.
TABLE 3 table of loss values of the optical fiber before aging test at 1300nm and 850nm wavelength
TABLE 4 table of loss values of the optical fiber after aging test at optical power test wavelengths of 1300nm and 850nm
Example four
Based on the same inventive concept, the present embodiment describes the scheme in the first embodiment in detail through a practical case. In this embodiment, the measured optical fiber is a single-mode optical fiber g.652, the sample length of the measured optical fiber is 20 meters, and the tail fiber length is 2 meters. The optical power test wavelengths were 1310nm and 1550 nm.
S1, the optical power of the tail fiber is tested, the light source, the tested tail fiber and the optical power meter are kept static in the test process, the test is carried out in a dust-free environment as much as possible, and the tidiness of a test fracture is guaranteed. Straightening and bidirectional switching for 6 times, obtaining 6 tail fiber optical power values by testing, and taking the average value as a reference optical power value P1(dBm)；
S2, using a welding machine to cut the tail fiber and weld the two sides of the bare fiber with high precision, verifying the welding loss by OTDR, limiting the welding loss within 0.05dBm, carrying out optical power test on the tail fiber connected with the bare fiber, straightening the tail fiber connected with the bare fiber, carrying out bidirectional test 6 times to obtain 6 optical power values, averaging to obtain a sample optical power value P2(dBm), obtaining a loss value Δ Pa ═ P before the aging test1-P2∣；
S3, ageing the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber, and using a high-temperature high-pressure reaction kettle as a hydrogen loss ageing test device under the test conditions of total pressure of 30MPa, hydrogen partial pressure of 3MPa, temperature of 300 ℃ and sample standing time of 96 h. After the aging test, the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber are respectively obtained3And P4；
S4 obtaining loss value delta Pb | -P after aging test3-P4∣；
S5, comparing the loss values before and after the aging test to obtain the hydrogen loss aging result of the optical fiber.
Tables 5 and 6 show the loss values of the optical fiber before and after the aging test at the optical power test wavelengths of 1310nm and 1550nm, respectively. By comparing Δ Pa and Δ Pb at corresponding wavelengths, it can be determined that the loss of the measured optical fiber increases by 2.71dB at the wavelength of 1310nm and 2.89dB at the wavelength of 1550nm under the aging test condition.
TABLE 5 table of loss values of the optical fiber before aging test at 1310nm and 1550nm optical power test wavelengths
TABLE 6 table of loss values of the optical fiber after aging test at 1310nm and 1550nm in optical power test wavelength
EXAMPLE five
Based on the same inventive concept, the present embodiment describes the scheme in the first embodiment in detail through a practical case. In this embodiment, the measured optical fiber is a single-mode optical fiber g.652, the sample length of the measured optical fiber is 20 meters, and the tail fiber length is 2 meters. The optical power test wavelengths were 1310nm and 1550 nm.
S1, the optical power of the tail fiber is tested, the light source, the tested tail fiber and the optical power meter are kept static in the test process, the test is carried out in a dust-free environment as much as possible, and the tidiness of a test fracture is guaranteed. Straightening and bidirectional switching for 6 times, obtaining 6 tail fiber optical power values by testing, and taking the average value as a reference optical power value P1(dBm)；
S2, using a welding machine to cut the tail fiber and weld the two sides of the bare fiber with high precision, verifying the welding loss by OTDR, limiting the welding loss within 0.05dBm, carrying out optical power test on the tail fiber connected with the bare fiber, straightening the tail fiber connected with the bare fiber, carrying out bidirectional test 6 times to obtain 6 optical power values, averaging to obtain a sample optical power value P2(dBm), obtaining a loss value Δ Pa ═ P before the aging test1-P2∣；
S3, ageing the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber, and using a high-temperature high-pressure reaction kettle as a hydrogen loss ageing test device under the test conditions of total pressure of 10MPa, hydrogen partial pressure of 1MPa, temperature of 100 ℃ and sample standing time of 48 h. After the aging test, the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber are respectively obtained3And P4；
S4 obtaining loss value delta Pb | -P after aging test3-P4∣；
S5, comparing the loss values before and after the aging test to obtain the hydrogen loss aging result of the optical fiber.
Tables 5 and 6 show the loss values of the optical fiber before and after the aging test at the optical power test wavelengths of 1310nm and 1550nm, respectively. By comparing Δ Pa and Δ Pb at corresponding wavelengths, it can be determined that the loss of the measured optical fiber increases by 0.64dB at the wavelength of 1310nm and 0.78dB at the wavelength of 1550nm under the aging test condition.
TABLE 7 table of loss values of the optical fiber before aging test at 1310nm and 1550nm optical power test wavelengths
TABLE 8 table of loss values of the optical fiber after aging test at 1310nm and 1550nm in optical power test wavelength
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims. The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A hydrogen loss aging test method for an underground optical fiber is characterized by comprising the following steps:
testing the optical power of the tail fiber to obtain an optical power value P1；
Connecting the tail fiber with the bare fiber, and carrying out optical power test on the tail fiber connected with the bare fiber to obtain an optical power value P2；
Obtaining the loss value delta Pa ═ P before the aging test1-P2∣；
Aging the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber to respectively obtain the optical power values P of the tail fiber which is not connected with the bare fiber and the tail fiber which is connected with the bare fiber3And P4；
Obtaining the loss value delta Pb | -P after aging test3-P4∣；
And obtaining the hydrogen loss aging result of the optical fiber by comparing the loss values before and after the aging test.
2. The method according to claim 1, wherein the optical power test first keeps a test fracture of a sample to be tested clean, connects one end of the sample to be tested with a light source, connects the other end of the sample to be tested with an optical power meter, performs several straightening and bidirectional reversing tests on the sample to be tested, obtains optical power values detected each time, and takes an average value thereof as the optical power value of the sample to be tested.
3. The method for testing hydrogen loss and aging of the downhole optical fiber according to claim 2, wherein the light source for the optical power test adopts a light source with stable radiation, the light source stably outputs optical signals with preset wavelength, preset mode and preset power, and the light source comprises a tungsten halogen lamp, a laser or a light emitting diode.
4. The method of claim 3, wherein the optical power test is capable of measuring at one or more wavelengths or within a predetermined wavelength range, the test wavelength being determined by the light source and the optical power meter.
5. The method as claimed in claim 4, wherein the testing wavelength is in the range of 800-1600nm, wherein the testing wavelength of the multimode fiber is in the range of 850nm-1300nm, and the testing wavelength of the single mode fiber is in the range of 1310nm-1550 nm.
6. The method for testing hydrogen loss aging of the downhole optical fiber according to any one of claims 1 to 5, wherein the connecting method of the pigtail and the bare fiber comprises the following steps: fusion splice, bare fiber quick couplers or adapters.
7. The downhole optical fiber hydrogen loss aging test method of any one of claims 1 to 5, wherein the total pressure in the aging test is in the range of 2 to 50 MPa; the hydrogen partial pressure is in the range of 1-5 MPa; the temperature is in the range of 100-500 ℃; the standing time of the sample to be tested is 1-12 days.
8. The method for hydrogen loss aging testing of downhole optical fiber according to any of claims 1 to 5, wherein the optical fiber is a short distance optical fiber, and the length of the optical fiber is in the range of 1 to 5 m.
9. The method for hydrogen loss aging testing of downhole optical fibers of claim 8, wherein the shortest length of the pigtail is less than 5 m.
10. The downhole optical fiber hydrogen loss aging testing method of claim 9, wherein the optical fiber comprises a multimode optical fiber and a single mode optical fiber, the multimode optical fiber comprises an OM1 optical fiber or an OM2/OM3 optical fiber; the single mode optical fiber includes: dispersion non-shifted single mode fiber, dispersion shifted fiber, cut-off wavelength shifted fiber, non-zero dispersion shifted fiber, low slope non-zero dispersion shifted fiber, or bend-resistant fiber.
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