CN109004973B - OTDR performance evaluation device and method - Google Patents
OTDR performance evaluation device and method Download PDFInfo
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- CN109004973B CN109004973B CN201810725343.2A CN201810725343A CN109004973B CN 109004973 B CN109004973 B CN 109004973B CN 201810725343 A CN201810725343 A CN 201810725343A CN 109004973 B CN109004973 B CN 109004973B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The OTDR performance evaluation device comprises an OTDR and a disk-mounted standard optical fiber, wherein the standard optical fiber is provided with an optical fiber connector, and the OTDR is connected with the standard optical fiber through the optical fiber connector of the standard optical fiber. The OTDR performance evaluation method of the invention utilizes the OTDR and the standard optical fiber to carry out the test of the optical fiber loss characteristic; connecting the OTDR with an optical fiber connector at one end of a standard optical fiber, and connecting an optical fiber connector at the other end of the standard optical fiber with an optical fiber transmitting mirror to test the length of the optical fiber; connecting the OTDR with the optical fiber connector at one end of the standard optical fiber, and connecting the optical fiber connector at the other end of the standard optical fiber with the optical fiber trap to perform dynamic range and blind area tests. The OTDR performance evaluation device and the method can realize the functions of testing the length, loss and the like of the OTDR and detecting the self performances of a dynamic range, a blind zone and the like, and make the whole device smaller and more portable and have wider function coverage on the premise of not influencing the testing precision.
Description
Technical Field
The invention belongs to the technical field of optical equipment detection, and particularly relates to an OTDR performance evaluation device and a method for evaluating OTDR performance by using the device.
Background
An Optical Time Domain Reflectometer (OTDR) is manufactured according to the principle of light backscattering and fresnel reflection, and obtains attenuation information by using the backscattering light generated when light propagates through an Optical fiber, and by analyzing a measurement curve, it is possible to know several properties of the Optical fiber, such as uniformity, defects, breakage, and coupling of a joint. The instrument can be generally used for measuring parameters such as optical fiber length, extension attenuation, joint loss, optical fiber fault point positioning and the like, is an essential tool in optical cable construction and monitoring, and plays an irreplaceable role in the optical network construction and maintenance process. Therefore, testing, calibration and verification of OTDR is very important.
At present, the test, calibration and verification of the OTDR in China are mainly based on the verification regulation of 'JJG 959-2001 optical time domain reflectometer', most of mechanisms adopt standard devices which are optical fiber length and loss standard devices manufactured by China metrology institute, the device mainly comprises three optical fibers, two optical fibers are matched with a 2X2 coupler to provide a length value, one optical fiber is used for providing a loss value, and the reading in the test process is convenient. However, the standard device has the disadvantages of large volume and weight and unstable mechanical structure; other mechanisms are based on the principle, some improvements are made on the standard device, for example, a fiber optic disc for providing a loss value is reduced, although the weight of the instrument is reduced to a certain extent, in the actual loss testing process, a stable interval needs to be manually found out in the length section and then manually marked, the reading is tedious, and the result of the testing mode is easily questioned by customers.
Disclosure of Invention
The invention aims to provide an OTDR performance evaluation device which is simple and small in structure and can obtain more accurate test results.
The invention also aims to provide a method for evaluating the OTDR performance by utilizing the device.
The invention adopts a technical scheme that: an OTDR performance evaluation device comprises an OTDR and a standard optical fiber which is arranged on a disc, wherein optical fiber connectors are arranged at two ends of the standard optical fiber, the two optical fiber connectors are the same or different, and the OTDR is connected with the standard optical fiber through the optical fiber connector at one end of the standard optical fiber.
Furthermore, an optical fiber connector at the other end of the standard optical fiber, which is far away from the end connected with the OTDR, is connected with an optical fiber reflector.
In particular, the fiber mirror is of Sagnac loop type or FRM type.
Furthermore, an optical fiber connector of the other end of the standard optical fiber, which is far away from the end connected with the OTDR, is connected with an optical fiber optical trap.
Furthermore, the optical fiber light trap is of a blackbody-like structure.
Specifically, the optical fiber optical trap is a graphite type optical fiber optical trap.
The other technical scheme adopted by the invention is as follows: an OTDR performance evaluation method, comprising the steps of:
providing an OTDR, a disc type standard optical fiber with optical fiber connectors at two ends, an optical fiber reflector and an optical fiber optical trap;
when an optical fiber loss characteristic test is carried out, the OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the OTDR emits an optical pulse signal according to set parameters, then the optical fiber loss characteristic is obtained according to the display content of an OTDR screen, and the optical pulse signal is compared with the predicted optical fiber loss characteristic of the standard optical fiber to evaluate the performance of the OTDR;
when an optical fiber length test is carried out, an OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the optical fiber connector at the other end of the standard optical fiber is connected with an optical fiber transmitting mirror, the OTDR transmits an optical pulse signal according to set parameters, then an optical fiber length value is obtained according to the display content of an OTDR screen, and the optical fiber length value is compared with the preset standard optical fiber length to evaluate the performance of the OTDR;
when a dynamic range and a blind area test is carried out, the OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the optical fiber connector at the other end of the standard optical fiber is connected with an optical fiber trap, the OTDR emits an optical pulse signal according to set parameters, and then the performance of the OTDR is evaluated according to the display content of an OTDR screen.
The invention has the beneficial effects that: the OTDR performance evaluation device and method can realize the test functions of OTDR length, loss and the like and the functions of detecting self performances of dynamic range, blind area and the like by using the disk-mounted standard optical fiber, the optical fiber reflector and the optical fiber optical trap, make the whole device smaller and lighter and have wider function coverage without influencing test precision and operation difficulty, and can replace the calibrated disk-mounted optical fiber to adapt to different customer requirements and be integrated on other instruments as a module.
Drawings
Fig. 1 is a schematic structural diagram of an OTDR performance evaluation apparatus according to the present invention;
FIG. 2 is a graph of fiber loss generated over the OTDR of example 1;
FIG. 3 is a graph of another fiber loss generated on the OTDR of example 1;
FIG. 4 is a graph of fiber length generated on the OTDR of example 2;
FIG. 5 is a dynamic range and blind spot profile generated on the OTDR of example 3;
figure 6 is another dynamic range and blind zone profile generated on the OTDR of example 3.
In the figure, 1 is a standard optical fiber, 2 is an optical fiber connector, 3 is an optical fiber reflector, and 4 is an optical fiber light trap.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The structure of the OTDR performance evaluation device provided by the present invention is shown in fig. 1, and the OTDR performance evaluation device includes an OTDR (not shown in the figure) and a standard optical fiber 1 installed on a disk, where two ends of the standard optical fiber 1 have optical fiber connectors 2, the two optical fiber connectors 2 may be the same or different, and the OTDR and the standard optical fiber 1 are connected through the optical fiber connector 2 at one end of the standard optical fiber 1.
When the optical fiber testing device is used, the OTDR transmits an optical pulse signal to the standard optical fiber 1 from the optical port according to set parameters under the control of the precision clock circuit, then the OTDR continuously receives the optical signal reflected from the standard optical fiber 1 from the optical port according to a certain time interval, and correspondingly tests the optical fiber according to the principles of back scattering (test loss) and Fresnel reflection (test reflection).
When the optical fiber is tested to be damaged, the OTDR is directly connected with the standard optical fiber 1, when optical pulse signals are transmitted, scattering sources are derived from tiny particles or uneven structures inside the optical fiber to reflect and absorb the light, when the light irradiates impurities, particles redirect the light to different directions, signal attenuation and back scattering are generated at the same time, a backward echo at a certain point in the optical fiber can reflect the distribution condition of optical power in the optical fiber, and the loss condition of the optical fiber can be tested through a map displayed by an OTDR screen.
When the length of the optical fiber is tested, the optical fiber connector 2 of the standard optical fiber 1, which is far away from the other end connected with the OTDR, is also connected with an optical fiber reflector 3. The fiber mirror 3, in conjunction with the standard optical fiber 1, provides the length and loss magnitude of the optical signal over multiple segments of the path. Specifically, the fiber mirror 3 is of Sagnac loop type or FRM type. If the test is simple, the type of the optical fiber reflector 3 can be a Sagnac ring type, so that the manufacturing cost is lower, and the test requirement can be met to a certain extent; if accurate test is needed, the fiber reflector 3 is of an FRM type, the performance is stable, the insertion loss and the polarization dependent loss are low, and the test result is more accurate.
When the dynamic range and blind area item test is carried out, the optical fiber connector 2 at the other end of the standard optical fiber 1, which is far away from the OTDR, is connected with the optical fiber light trap 4, and the optical fiber light trap 4 is utilized to eliminate the noises such as stray light, magic peak and the like, so that the dynamic range and blind area test can be closer to an ideal state. Further, the optical fiber light trap 4 is of a blackbody-like structure. Specifically, the optical fiber trap 4 is a graphite type optical fiber trap.
The OTDR performance evaluation method provided by the invention comprises the following steps:
providing an OTDR, a disc type standard optical fiber with optical fiber connectors at two ends, an optical fiber reflector and an optical fiber optical trap;
when an optical fiber loss characteristic test is carried out, the OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the OTDR emits an optical pulse signal according to set parameters, then the optical fiber loss characteristic is obtained according to the display content of an OTDR screen, and the optical pulse signal is compared with the predicted optical fiber loss characteristic of the standard optical fiber to evaluate the performance of the OTDR;
when an optical fiber length test is carried out, an OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the optical fiber connector at the other end of the standard optical fiber is connected with an optical fiber transmitting mirror, the OTDR transmits an optical pulse signal according to set parameters, then an optical fiber length value is obtained according to the display content of an OTDR screen, and the optical fiber length value is compared with the preset standard optical fiber length to evaluate the performance of the OTDR;
when a dynamic range and a blind area test is carried out, the OTDR is connected with an optical fiber connector at one end of a standard optical fiber, the optical fiber connector at the other end of the standard optical fiber is connected with an optical fiber trap, the OTDR emits an optical pulse signal according to set parameters, and then the performance of the OTDR is evaluated according to the display content of an OTDR screen.
The following will further specifically describe the evaluation method of the present invention by specific examples, which are merely provided as an aid to the description of the present invention, and the protection scope of the present invention includes but is not limited to the following examples.
Example 1
The embodiment is used for testing the loss characteristic of an optical fiber, two ends of a disk type standard optical fiber 1 are FC/PC connectors, the insertion loss is less than or equal to 0.2, the return loss is more than or equal to 50, one end of the standard optical fiber 1 is connected with an OTDR, the other end of the standard optical fiber is suspended, the group refractive index of the OTDR is set to be 1.4600, the pulse width is set to be 100ns, the average time is 10s, the OTDR is started to emit optical pulse signals, parameters of an attenuator are directly changed on the OTDR, loss characteristic display values of optical fiber sections in different states can be recorded through an atlas on an OTDR screen, fig. 2 and fig. 3 are that the atlas in the embodiment in different states of 2.5km length, 1310nm length, 2.5km length and 1550nm length is directly read, the loss of the optical fiber displayed at the upper left corner is directly read, and then the loss parameters of the optical fiber are compared with the loss parameter of the standard optical fiber 1 as a reference, so that the time consumption performance of the OTDR testing the optical fiber can be evaluated. The invention directly reads the readings through OTDR, does not need to manually find a stable interval in the length section and then manually mark the manual reading, has the same test effect as the device manufactured by the Chinese measurement institute, but has simple operation and intuitive result.
Example 2
The embodiment is used for testing the length of the optical fiber, the two ends of the coiled standard optical fiber 1 are FC/PC connectors, the insertion loss is less than or equal to 0.2, and the return loss is more than or equal to 50. One end of the disk standard optical fiber 1 is connected with the OTDR to be tested, and the other end is connected with the optical fiber reflector 3. Setting the group refractive index of the OTDR to be 1.4600, the pulse width to be 100ns and the average time to be 30 s; the optical fiber reflector 3 is a light reflection type device, and may be an FRM type or a Sagnac loop type, in this embodiment, a Sagnac loop type optical fiber reflector with slightly weak performance is selected to match with a standard optical fiber to simulate the length of an optical signal in a multi-segment path, and provide a corresponding magnitude. The optical pulse signal is transmitted by using the OTDR, then the length value is read on a screen, and is compared with the length of the standard optical fiber 1 and the integral multiple length thereof, and the indicating value error of each point is calculated.
The standard optical fiber is used as the reference of each parameter and is matched with the optical fiber reflector 3 to form an optical fiber-like resonant cavity structure, and light is continuously reflected and lost in the optical fiber-like resonant cavity structure, so that a plurality of reflection peaks with gradually reduced amplitude are formed on an OTDR analysis curve. The test result of this embodiment is shown in fig. 4, and the profile is a curve generated by OTDR after the optical signal is repeatedly transmitted and circulated in the optical fiber, and is consistent with the profile type provided by the standard device in jjjg 959-. And sequentially reading the positions of the rising edges of all peaks in the curve, wherein the test result accords with the technical index provided by an instrument manufacturer. Since the measurement process of this embodiment uses only one disk of optical fiber, the measurement uncertainty is smaller.
Example 3
The embodiment is used for testing the dynamic range and blind zone items, and acquiring the performance in the aspects of precision and noise control. When the dynamic range test is performed, the longitudinal distance of the dynamic range displayed by the OTDR under the corresponding set pulse width should be greater than the set signal strength, for example, the dynamic range should be greater than 30dB under the condition that a communication user will require the OTDR to set the maximum pulse width. When the blind area test is performed, the transverse distance of the blind area displayed by the OTDR should be smaller than the set distance under the corresponding set pulse width, for example, under the condition that a communication user will require the OTDR to set the minimum pulse width, the event blind area should be smaller than 3m, and the attenuation blind area should be smaller than 5 m. And judging whether the indication value meets the requirement or not through the measurement range size of the OTDR and the parameter related to the minimum resolution capability.
In this embodiment, the two ends of the standard optical fiber 1 are FC/PC connectors, the insertion loss is less than or equal to 0.2, and the return loss is greater than or equal to 50. One end of the disk-mounted standard optical fiber 1 is connected with the OTDR to be tested, and the other end is connected with the optical fiber optical trap 4. The optical fiber light trap 4 is a light absorption device, the tail end is made of a blackbody-like material, and the graphite type optical fiber light trap is matched with the standard optical fiber to provide a test environment with a dynamic range and blind area parameters. As shown in fig. 5 and 6, the test result is obtained by extrapolating the back scattering signal curve to intersect with the power axis, and the longitudinal distance/power difference between the intersection point and the background noise is recorded as the dynamic range in the state; the OTDR shows that the background track with the track deviation not interfered exceeds a given ordinate by 0.5dB, and the transverse distance/length when the track deviation is read to the right falling edge by 0.5dB is recorded as an attenuation blind area in the state; the OTDR shows that the transverse distance/length between two points 1.5dB lower than the reflection peak point on the reflection signal trace on the trace is recorded as an event blind area in the state; the dynamic range and the blind area are in positive correlation with the pulse width set on the OTDR, and the test obtains corresponding results under the conditions of fixed pulse width, wavelength and average time.
Claims (3)
1. An OTDR performance evaluation device, characterized in that, said OTDR performance evaluation device is configured to execute an OTDR performance evaluation method, specifically:
the OTDR performance evaluation device comprises an OTDR and a disk-mounted standard optical fiber, wherein two ends of the standard optical fiber are provided with optical fiber connectors;
when the optical fiber loss tester is used for testing the loss characteristics of optical fibers, the two ends of the standard optical fiber are FC/PC connectors, the insertion loss is less than or equal to 0.2, and the return loss is more than or equal to 50; connecting one end of the standard optical fiber with the OTDR, and suspending the other end of the standard optical fiber; setting the group refractive index of the OTDR to be 1.4600, the pulse width to be 100ns and the average time to be 10 s; starting an OTDR to emit a light pulse signal, directly changing the parameters of an attenuator on the OTDR, and recording the loss characteristic display values of the optical fiber sections in different states through an atlas on an OTDR screen; directly displaying the optical fiber loss, and then comparing the optical fiber loss with the loss parameter of the standard optical fiber as a reference to evaluate the performance of the OTDR when testing the optical fiber loss;
when the optical fiber length tester is used for testing the length of an optical fiber, the two ends of the standard optical fiber are FC/PC connectors, the insertion loss is less than or equal to 0.2, and the return loss is more than or equal to 50; one end of the standard optical fiber is connected with the OTDR to be tested, and the other end of the standard optical fiber is connected with the optical fiber reflector; setting the group refractive index of the OTDR to be 1.4600, the pulse width to be 100ns and the average time to be 30 s; the optical fiber reflector is a light reflection type device; transmitting optical pulse signals by using an OTDR (optical time domain reflectometer), reading length values on a screen, comparing the length values with the length of the standard optical fiber and integral multiple length of the standard optical fiber, and calculating indication value errors of all points; the standard optical fiber is used as the reference of each parameter and matched with the optical fiber reflector to form an optical fiber-like resonant cavity structure, and light is continuously reflected and lost in the optical fiber-like resonant cavity structure, so that a plurality of reflection peaks with gradually reduced amplitude are formed on an OTDR analysis curve; sequentially reading the positions of the rising edges of all peaks in the curve to obtain a test result;
when the optical fiber is used for testing dynamic range and blind area items, the two ends of the standard optical fiber are FC/PC connectors, the insertion loss is less than or equal to 0.2, and the return loss is more than or equal to 50; one end of the standard optical fiber is connected with an OTDR to be tested, and the other end of the standard optical fiber is connected with an optical fiber optical trap, wherein the optical fiber optical trap is an optical absorption device, and the tail end of the optical fiber optical trap is made of a blackbody-like material; extrapolating a backscattering signal curve to be intersected with a power axis, and recording a longitudinal distance/power difference between an intersection point and the background noise as a dynamic range in the state; the OTDR shows that the background track with the track deviation not interfered exceeds a given ordinate by 0.5dB, and the transverse distance/length when the track deviation is read to the right falling edge by 0.5dB is recorded as an attenuation blind area in the state; the OTDR shows that the transverse distance/length between two points 1.5dB lower than the reflection peak point on the reflection signal trace on the trace is recorded as an event blind area in the state; the dynamic range and the blind area are in positive correlation with the pulse width set on the OTDR, and a corresponding result is obtained under the conditions of fixed pulse width, wavelength and average time through testing; when the dynamic range test is carried out, the longitudinal distance of the dynamic range displayed by the OTDR under the correspondingly set pulse width is larger than the set signal intensity; when a blind area test is carried out, the transverse distance of the blind area displayed by the OTDR under the corresponding set pulse width is smaller than the set distance; judging whether the display value meets the requirement or not according to the preset OTDR measurement range size and the parameter related to the minimum resolution capability;
the optical fiber light trap is a graphite type optical fiber light trap.
2. An OTDR performance evaluation device according to claim 1, characterized in that said fiber mirror is of Sagnac loop type or FRM type.
3. An OTDR performance evaluation device according to claim 1, wherein said fiber optic trap is of a blackbody-like structure.
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| CN112769471B (en) * | 2019-11-01 | 2022-08-26 | 华为技术有限公司 | Optical fiber testing method based on optical time domain reflectometer and optical time domain reflectometer |
| CN113783608B (en) * | 2021-09-26 | 2022-11-22 | 中电科思仪科技股份有限公司 | Long-distance programmable optical fiber cable loss distribution testing device and method |
| CN117375715A (en) * | 2022-06-30 | 2024-01-09 | 中兴通讯股份有限公司 | OTDR trace correction method, electronic equipment and storage medium |
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| CN103575930A (en) * | 2013-10-23 | 2014-02-12 | 浙江大学 | Method and device for manufacturing light trap with hollow photonic crystal fiber |
| CN104406528A (en) * | 2014-11-25 | 2015-03-11 | 中国科学技术大学 | Optical trapping based method for in-situ calibration of displacement of piezoelectric platform |
| CN105784662A (en) * | 2016-04-27 | 2016-07-20 | 武汉大学 | Liquid-phase suspension biochip based on multi-optical trap encoding bead array and two-photon fluorescence detection |
| CN206710307U (en) * | 2017-03-30 | 2017-12-05 | 中科天融(北京)科技有限公司 | A kind of light path device for being used for the preceding ultralow flue dust monitor of scattering |
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Address after: No. 8 Qishan Road, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province, 510000, 150 Patentee after: Radio and TV Measurement and Testing Group Co.,Ltd. Address before: 510630 Xiping Road, Whampoa Road, Tianhe District, Guangzhou, Guangdong 163 Patentee before: GUANGZHOU GRG METROLOGY & TEST Co.,Ltd. |