CN107449588B - Communication optical fiber macrobend loss test method - Google Patents
Communication optical fiber macrobend loss test method Download PDFInfo
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- CN107449588B CN107449588B CN201710733474.0A CN201710733474A CN107449588B CN 107449588 B CN107449588 B CN 107449588B CN 201710733474 A CN201710733474 A CN 201710733474A CN 107449588 B CN107449588 B CN 107449588B
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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
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Abstract
The invention discloses a method for testing macrobend loss of communication optical fiber, which comprises the steps of winding the communication optical fiber to be tested in an optical power absorbent according to the radius and the number of turns required by the test, and testing the macrobend loss of the optical fiber to be tested by adopting a macrobend loss testing device, thereby effectively absorbing the optical power leaked out of the optical fiber in the testing process, inhibiting the influence of W wave on the test, obtaining the true numerical value of the macrobend loss of the optical fiber, and ensuring the accuracy and the stability of the macrobend loss test.
Description
Technical Field
The invention relates to the technical field of optical fiber testing, in particular to a macro-bending loss testing method for communication optical fibers.
Background
The macrobending loss of the communication optical fiber is increased along with the increase of the wavelength and the reduction of the bending radius, when the macrobending loss of the optical fiber is tested under the condition of the bending radius, the macrobending loss of the optical fiber is tested under the same test condition aiming at the same test sample, the result of multiple tests has larger difference, and the main reason of the difference is that a radiation mode radiated out of a fiber core under the bending condition is reflected back to the fiber core for multiple times through the fiber core and a cladding, the cladding and a fiber coating, and the fiber coating and an air interface, is coupled with a transmission mode, and has the phenomenon of interference strengthening or weakening under the specific condition, which is called the influence of Whispering valley modes (W wave for short). Under the influence of the phenomenon, when the macrobending loss test of the optical fiber is carried out, the macrobending loss oscillation phenomenon can occur, so that the macrobending loss test result is inaccurate.
Disclosure of Invention
The invention aims to solve the technical problems of inhibiting the influence of W waves and realizing accurate and stable test of the macrobend loss of the communication optical fiber, and aims to provide a test method of the macrobend loss of the communication optical fiber and solve the problems of inaccurate measurement and poor stability of the current test method.
The invention is realized by the following technical scheme:
a macrobend loss test method for communication optical fibers comprises the following steps:
A. preparing an optical fiber to be tested according to the test requirement, specifically winding the optical fiber to be tested according to the radius and the number of turns required by the test;
B. placing the optical fiber to be tested in an optical power absorbent;
C. and testing the macrobend loss of the optical fiber to be tested by adopting the macrobend loss testing device.
In particular, the optical power absorber has an optical refractive index equal to or greater than an optical refractive index of the optical fiber coating.
Particularly, the optical refractive index of the optical power absorbent is greater than or equal to that of an optical fiber cladding, and the optical fiber to be measured adopts the optical fiber with the coating stripped.
In particular, the optical power absorbent specifically adopts ethyl cinnamate.
In particular, glycerol is used as the optical power absorber.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method for testing the macrobend loss of the communication optical fiber, the optical fiber to be tested is placed in the optical power absorbent after being wound according to the radius and the number of turns required by the test, and the macrobend loss of the optical fiber to be tested is tested by adopting the macrobend loss testing device, so that the optical power leaked out of the optical fiber is effectively absorbed in the testing process, the influence of W wave on the test is inhibited, the true numerical value of the macrobend loss of the optical fiber is obtained, and the accuracy and the stability of the macrobend loss test of the optical fiber are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a diagram illustrating an internal optical refraction structure of an optical fiber in the presence of W-wave interference according to embodiment 1 of the present invention.
Fig. 2 is a test result of macrobend loss of an optical fiber obtained when ethyl cinnamate is used as an optical power absorber according to embodiment 1 of the present invention.
Fig. 3 is a macrobend loss test result of an optical fiber obtained when glycerol is used as an optical power absorber according to embodiment 2 of the present invention.
Fig. 4 is a flowchart of a macrobend loss testing method for a communication optical fiber according to embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
The optical fiber is made of silica glass, and light absorption and scattering are factors causing loss, and another factor causing optical loss is bending of the optical fiber, which results in destruction of total reflection conditions. Macrobending losses in optical communication fibers increase with increasing wavelength and decreasing bend radius. When the macrobend loss of the communication optical fiber is tested under the condition of small bending radius, the test results of multiple times of tests on the same test sample under the same test condition have larger difference. The main reason for this difference is that the radiation mode radiated out of the fiber core under bending condition is reflected back to the fiber core through the fiber core and cladding, cladding and fiber coating, and fiber coating and air interface for many times, and coupled with the transmission mode, and under specific conditions, a phenomenon of interference enhancement or attenuation occurs, which is called the impact of Whispering balloon modes (W wave for short). As shown in fig. 1, fig. 1 is a structural diagram of a communication optical fiber in the presence of W-wave interference according to embodiment 1 of the present invention. Under the influence of the phenomenon, when the macrobending loss test of the communication optical fiber is carried out, macrobending loss oscillation phenomenon can occur, so that the macrobending loss test result is inaccurate.
In order to inhibit the interference of W wave on the test result in the process of testing the macrobending loss of the communication optical fiber, the optical fiber to be tested is placed in an optical power absorbent, the optical refractive index of the optical power absorbent is greater than the optical refractive index of an optical fiber coating and/or an optical fiber cladding, so that the absorption of the optical power leaked out of the optical fiber can be realized, the radiation mode radiated out of the fiber core is prevented from being reflected back to the fiber core for many times through the fiber core and the cladding, the cladding and the optical fiber coating, and the optical fiber coating and an air interface and being coupled with a transmission mode, the influence of the W wave on the test is inhibited, and the true value of the macrobending loss of the.
Example 1
As shown in fig. 4, fig. 4 is a flowchart of a macrobend loss testing method for a communication optical fiber according to embodiment 1 of the present invention.
In this embodiment, ethyl cinnamate is used as an optical power absorbent to test macrobend loss of an optical fiber, and the specific method includes:
and S101, winding the communication optical fiber to be tested according to the radius and the number of turns required by the test.
Regarding the test of the macrobend loss of the optical fiber, there are two descriptions for the B1.3 type single mode fiber in the national standard GB/T9771.3-2008, one of which is: the optical fiber is loosely wound by 100 circles with the radius of 30mm, and the macrobending loss measured at 1625nm should not exceed 0.1 dB; the second is as follows: to ensure that the bending losses are easily measured and the accuracy of the measurement is good, the test can be carried out with 1 or several turns of small-radius ring fiber instead of 100 turns of fiber, in which case the radius of the number of turns of the ring to be wound and the maximum allowable bending loss should both be adapted to the value of the loss of the 30mm radius 100 turn test.
In the national standard GB/T9771.7-2012, B6 single-mode optical fiber has macrobend loss increased along with wavelength, and the macrobend loss at two long wavelength positions of 1550nm and 1625nm is selected as an index. In order to ensure easy measurement and measurement accuracy of macrobending losses, tests can be carried out with other bending radii and turns, in which case the number of turns, the radius of the ring and the maximum allowed macrobending losses should all be adapted to the indices in the table.
Based on the above standard, this embodiment selects a section of optical fiber with a length of 22m and a model of g.657.a2 for testing, prepares the optical fiber to be tested according to the standard of Φ 15mm × 1 circle, and winds the optical fiber to be tested by 7.5mm as a radius.
S102, placing the optical fiber to be tested in an optical power absorbent.
In the process of testing the macrobending loss of the optical fiber, a radiation mode radiated out of a fiber core under a bending condition is reflected back to the fiber core for many times through the fiber core and the cladding, the cladding and the fiber coating, and the fiber coating and an air interface and is coupled with a transmission mode, so that W waves exist and further interference is generated on a test result, and therefore in order to obtain a true value of the macrobending loss of the optical fiber, the optical power leaked out of the communication optical fiber is absorbed as much as possible. The optical refractive index of the communication optical fiber coating is larger than that of the cladding, the optical fiber to be tested is placed in the liquid with the optical refractive index larger than that of the optical fiber coating for testing, the optical power leaked out of the optical fiber coating can be effectively absorbed, and the obtained test result is higher in accuracy and stability.
The media with different light refractive indexes have different absorption effects on the optical power, the light refractive index of the ethyl cinnamate is 1.567, the ethyl cinnamate has the characteristics of being easy to obtain, low in price and harmless, and the light refractive indexes of the cladding and the coating of the optical fiber are 1.4 and 1.5 respectively, so that the optical fiber to be detected prepared in the step S101 is placed in the ethyl cinnamate by adopting the ethyl cinnamate as the optical power absorbent.
S103, testing the macrobend loss of the optical fiber to be tested by adopting the macrobend loss testing device.
A macrobend loss testing device is connected with the optical fiber to be tested, macrobend loss of the optical fiber placed in the ethyl cinnamate in the step S102 is tested, and an obtained test result is shown in fig. 2, where fig. 2 is the macrobend loss test result obtained when the ethyl cinnamate is used as the optical power absorbent provided in embodiment 1 of the present invention. The curve shown by the solid line in fig. 2 is a corresponding curve diagram of wavelength and macrobend loss obtained by placing the optical fiber to be tested in the air, and the dashed line is a corresponding curve diagram of wavelength and macrobend loss obtained by placing the optical fiber to be tested in ethyl cinnamate. Therefore, ethyl cinnamate is used as an optical power absorbent, so that the optical power leaked out of the optical fiber coating can be greatly absorbed, and the influence generated by W wave is inhibited, so that the real numerical value of macrobend loss is obtained, and the accuracy of macrobend loss testing is ensured.
It should be noted that the method described in this example is equally applicable to the testing of optical fibers prepared according to the Φ 60mm x 100 turn standard, as well as according to the 1 turn or several turns small radius ring standard.
Example 2
The present embodiment is similar to the test procedure of embodiment 1, except that the optical refractive index of the optical power absorber is greater than the optical refractive index of the optical fiber cladding, and in order to obtain a more stable test result, the optical fiber cladding is stripped and then placed in the optical power absorber for testing. As an optical power absorbent, glycerin has a light refractive index of 1.4746, and has the characteristics of easy availability, low price, and no harm, the optical fiber to be tested is placed in glycerin after the coating is stripped, and a macrobending loss test is performed on the optical fiber, and the obtained test result is shown in fig. 3, where fig. 3 is the macrobending loss test result obtained when glycerin is used as the optical power absorbent in embodiment 2 of the present invention. The curve shown by the solid line in fig. 3 is a curve corresponding to the wavelength and macrobend loss obtained by placing the optical fiber to be tested in the air, and the dashed line is a curve corresponding to the wavelength and macrobend loss obtained by placing the optical fiber to be tested in glycerol after the coating is stripped, and the comparison of the two curves shows that the test result obtained by placing the optical fiber to be tested in glycerol after the coating is stripped is smoother, and the oscillation phenomenon of macrobend loss along with the wavelength is eliminated. Therefore, glycerin is used as an optical power absorbent, so that the optical power leaked out of the optical fiber can be greatly absorbed, and the influence generated by W wave is inhibited, so that a real numerical value of macrobend loss is obtained, and the accuracy of macrobend loss testing is ensured.
It should be noted that the optical power absorber is not limited to the materials described in the above 2 embodiments, and other materials with optical refractive index greater than that of the optical fiber cladding and/or coating are also used to improve the accuracy and stability of the optical fiber macrobending loss test.
According to the technical scheme, the communication optical fiber to be tested is placed in the optical power absorbent after being coiled according to the radius and the number of turns required by the test, and the macrobend loss of the optical fiber to be tested is tested by adopting the macrobend loss testing device, so that the optical power leaked out of the optical fiber is effectively absorbed in the testing process, the influence of W waves on the test is inhibited, the true numerical value of the macrobend loss of the optical fiber is obtained, and the accuracy and the stability of the macrobend loss test are ensured.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A macrobend loss test method for communication optical fibers is characterized by comprising the following steps:
A. preparing an optical fiber to be tested according to the test requirement, specifically winding the optical fiber to be tested according to the radius and the number of turns required by the test;
B. placing the optical fiber to be tested in an optical power absorbent;
C. testing the macrobend loss of the optical fiber to be tested by adopting a macrobend loss testing device; in the test process, the optical power absorbent effectively absorbs the optical power leaked out of the optical fiber so as to inhibit the influence of W wave on the test;
the optical power absorbent has an optical refractive index greater than that of the optical fiber coating and/or an optical refractive index greater than that of the optical fiber cladding.
2. The method for testing macrobend loss of communication optical fiber according to claim 1, wherein the optical power absorber specifically employs ethyl cinnamate.
3. The method for testing macrobend loss of communication optical fiber according to claim 1, wherein the optical power absorber specifically uses glycerol.
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| CN201610723643.8A CN106441812A (en) | 2016-08-25 | 2016-08-25 | Communication optical fiber macrobending loss test method |
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| CN102661850A (en) * | 2012-04-12 | 2012-09-12 | 中国科学院西安光学精密机械研究所 | Non-destructive testing device for transmission loss of plastic optical fibre |
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| JP2012194004A (en) * | 2011-03-15 | 2012-10-11 | Sumitomo Electric Ind Ltd | Optical fiber characteristic measuring method |
| CN104913906A (en) * | 2015-05-29 | 2015-09-16 | 成都亨通光通信有限公司 | Optical fiber bending loss determination system |
| CN106338381A (en) * | 2016-08-25 | 2017-01-18 | 电信科学技术第五研究所 | Novel communication optical fiber macro-bend loss test device and test method |
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| CN102661850A (en) * | 2012-04-12 | 2012-09-12 | 中国科学院西安光学精密机械研究所 | Non-destructive testing device for transmission loss of plastic optical fibre |
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| GBT 15972.47-2008 光纤试验方法规范 第47部分：传输特性和光学特性的测量方法和试验程序——宏弯损耗;中国国家标准化管理委员会等;《中华人民共和国国家标准》;20080331;第1-2页程序部分 * |
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