CN109547099B - Method for OTDR module self-adaptive pulse width detection in optical cable monitoring - Google Patents
Method for OTDR module self-adaptive pulse width detection in optical cable monitoring Download PDFInfo
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- CN109547099B CN109547099B CN201811394913.0A CN201811394913A CN109547099B CN 109547099 B CN109547099 B CN 109547099B CN 201811394913 A CN201811394913 A CN 201811394913A CN 109547099 B CN109547099 B CN 109547099B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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Abstract
The invention discloses a method for detecting the self-adaptive pulse width of an OTDR module in optical cable monitoring, which comprises the following steps: 1) performing alarm reference test line information configuration on the OTDR module; 2) storing corresponding dynamic values pre-measured under all test parameter conditions of the OTDR module in a one-to-one correspondence manner; 3) comparing and analyzing according to the chain length and the chain loss of the current test line, the accumulated loss of a specific position point of the test line and the dynamics under the test parameters, and preferably selecting the test pulse width suitable for the broken test line; 4) and (3) testing the broken tested line again by using the test pulse width parameter of the test line obtained in the step 3), and obtaining an alarm positioning position according to the test line result obtained by the new test. The method can avoid the problems of overlarge blind area and trailing caused by using the original test pulse width after the optical fiber to be tested is broken, and can improve the accuracy of alarm positioning.
Description
Technical Field
The invention relates to the optical communication technology, in particular to optical cable monitoring, and specifically relates to a method for OTDR module adaptive pulse width detection in optical cable monitoring.
Background
In a conventional optical cable monitoring system, when an optical power alarm is generated, a control unit in the optical cable monitoring system drives an OTDR module to test a test parameter of a reference curve for an optical fiber to be tested, and then the test curve and the reference curve are compared and analyzed to obtain an alarm position.
However, in practice, when the optical fiber to be tested is broken, the length of the optical fiber is changed, and the original test pulse width is probably no longer suitable for the current broken line. Particularly, when the optical fiber over 100km is broken into the optical fiber of several hundred meters, and the original test pulse width used for testing the optical fiber over 100km is used for testing the optical fiber of several hundred meters, the blind area is too large, the trailing is serious, and the accurate fiber breaking position cannot be obtained, thereby causing the inaccurate alarm position.
In view of the above, it is necessary to initiate secondary testing, and it is common practice to configure a typical test pulse width for optical fibers of different lengths, which is not a problem for an ideal optical fiber, but in optical cable monitoring, the optical fiber to be tested is generally degraded seriously, and the test pulse width without considering the actual loss of the optical fiber is likely to be insufficient dynamically, thereby leading to an erroneous analysis result.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for OTDR module adaptive pulse width detection in optical cable monitoring. The method can avoid the problems of overlarge blind area and trailing caused by using the original test pulse width after the optical fiber to be tested is broken, and can improve the accuracy of alarm positioning.
The technical scheme for realizing the purpose of the invention is as follows:
an OTDR module adaptive pulse width detection method used in optical cable monitoring is different from the prior art, and comprises the following steps:
1) performing alarm reference test line information configuration on the OTDR module, and storing the alarm reference test line information configuration in the OTDR module;
2) storing corresponding dynamic values pre-measured under all test parameter conditions of the OTDR module in a one-to-one correspondence manner;
3) when a fiber break is found: triggering OTDR by optical power alarm to initiate a first test on an optical fiber to be tested by using an original test parameter, when an actual chain length can be obtained, if the actual chain length is smaller than that of a reference test line, the optical fiber is broken, if the actual chain length cannot be obtained due to an overlarge blind area of the original test parameter, a loss value at the tail position of the optical fiber to be tested is inspected, if the loss value is lower than a noise level, the optical fiber is broken, the accumulated loss of a specific position point of the reference test line and the Dynamic value under the test parameter are compared according to the chain length and the chain loss of the current test line, the test pulse width suitable for the broken test line is preferably selected, namely the chain length of the current test line is marked as CurFiberLen and the chain loss CurFiberLoss, the Dynamic values obtained by testing under different test parameters of different wavelengths, different pulse widths and different test duration are marked as Dynamic, a group of specific position points on the reference test line in the step 1) are selected, and the accumulated loss Valid, traversing each pulse width: the specific position points are respectively T1, T2, T3, T4, T5 and T6, and when the chain loss CurFiberLoss of the current test line is a valid value, the CurFiberLoss is ValidLoss; when the chain loss CurFiberLoss of the current test line is an invalid value, if the chain length L of the current test line is not more than T1, the CurFiberLoss is T1, if the chain length T1 of the current test line is more than L and not more than T2, the CurFiberLoss is T2, if the chain length T2 of the current test line is more than L and not more than T3, the ValidLoss values of the CurFiberLoss is T3, T4, T5 and T6 are analogized in sequence, the maximum pulse width is found from the minimum pulse width, when the value of Dynamic-CurFiberLoss-diff is not less than 0, the test pulse width parameter of the appropriate test line is found, and the finding is stopped, wherein diff is a loss margin and is generally 1-2 dB;
4) and (3) testing the broken tested line again by using the test pulse width parameter of the test line obtained in the step 3), and obtaining an alarm positioning position according to the test line result obtained by the new test.
The alarm reference test line information in the step 1) is test parameters, curve point information, event point information, chain length and chain loss.
The test parameters in the step 1) are measuring range, wavelength, pulse width, refractive index, non-reflection threshold, ending threshold and test duration.
The method can avoid the problems of overlarge blind area and trailing caused by using the original test pulse width after the optical fiber to be tested is broken, and can improve the accuracy of alarm positioning.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment method.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, but the present invention is not limited thereto.
Example (b):
referring to fig. 1, a method for OTDR module adaptive pulse width detection in optical cable monitoring includes the following steps:
1) performing alarm reference test line information configuration on the OTDR module, and storing the alarm reference test line information configuration in the OTDR module;
2) storing corresponding dynamic values pre-measured under all test parameter conditions of the OTDR module in a one-to-one correspondence manner;
3) when an optical fiber is found to be broken, an optical power alarm triggers OTDR to initiate a first test on the optical fiber to be tested by using an original test parameter, when an actual chain length can be obtained, the optical fiber is broken if the actual chain length is smaller than the chain length of a reference test line, if the actual chain length cannot be obtained due to an overlarge blind area of the original test parameter, a loss value of the tail position of the optical fiber to be tested is inspected, if the loss value is lower than a noise level, the optical fiber is broken, the test pulse width suitable for the broken test line is preferably selected according to the chain length and the chain loss of the current test line, the accumulated loss of a specific position point of the reference test line and a Dynamic value under the test parameter, namely the chain length of the current test line is marked as CurFiberLen, the chain loss is marked as CurFiberLoss, the Dynamic values obtained by testing under test parameters with different wavelengths, different pulse widths and different test duration are marked as Dynamic, a group of specific position points on the test line in the step 1) is selected and the accumulated loss, the specific location points are T1, T2, T3, T4, T5 and T6, respectively, and in this example, the specific location points are T1-1 km, T2-5 km, T3-10 km, T4-30 km, T5-60 km and T6-90 km, respectively, and the respective pulse widths are traversed: when the chain loss CurFiberLoss of the current test line is an effective value, the CurFiberLoss is ValidLoss; when the chain loss CurFiberLoss of the current test line is an invalid value, if the chain length L of the current test line is not more than T1, the CurFiberLoss is T1, if the chain length T1 of the current test line is not less than L not more than T2, the CurFiberLoss is T2, if the chain length T2 of the current test line is not more than L not more than T3, the CurFiberLoss is T3, the CurFiberLoss values T4, T5 and T6 are analogized in sequence, then each pulse width is traversed, searching is started from the minimum pulse width, the minimum pulse width is 5ns in the example, the maximum pulse width is found all the time, the maximum pulse width is selected in the example, and when the value of Dynamic-CurFiberLoss-diff is not less than 0, the test pulse width parameter of the appropriate test line is found, and the test line is stopped, wherein diff is recorded as loss, and diff in the example is 1-2 dB;
4) and (3) testing the broken tested line again by using the test pulse width parameter of the test line obtained in the step 3), and obtaining an alarm positioning position according to the test line result obtained by the new test.
The alarm reference test line information in the step 1) is test parameters, curve point information, event point information, chain length and chain loss.
The test parameters in the step 1) are measuring range, wavelength, pulse width, refractive index, non-reflection threshold, ending threshold and test duration.
Claims (3)
1. A method for OTDR module self-adaptive pulse width detection in optical cable monitoring is characterized by comprising the following steps:
1) performing alarm reference test line information configuration on the OTDR module, and storing the alarm reference test line information configuration in the OTDR module;
2) storing corresponding dynamic values pre-measured under all test parameter conditions of the OTDR module in a one-to-one correspondence manner;
3) when a fiber break is found: comparing and analyzing according to the chain length and the chain loss of the current test line, the accumulated loss of a specific position point of a reference test line and the dynamics under the test parameters, preferably selecting the test pulse width suitable for the broken test line, namely, the chain length of the current test line is marked as CurFiberLen, the chain loss is marked as CurFiberLoss, the Dynamic values obtained by testing under the test parameters of different wavelengths, different pulse widths and different test durations are marked as Dynamic, selecting a group of specific position points on the reference test line in the step 1) and calculating the accumulated loss ValidLoss of the specific position points, wherein the specific position points are respectively T1, T2, T3, T4, T5 and T6, and traversing each pulse width: when the chain loss CurFiberLoss of the current test line is an effective value, the CurFiberLoss is ValidLoss; when the chain loss CurFiberLoss of the current test line is an invalid value, if the chain length L of the current test line is not more than T1, the CurFiberLoss is T1, if the chain length T1 of the current test line is more than L and not more than T2, the CurFiberLoss is T2, if the chain length T2 of the current test line is more than L and not more than T3, the CurFiberLoss is T3, the CurFiberLoss values of T4, T5 and T6 are analogized in sequence, the maximum pulse width is searched from the minimum pulse width, the searching is continuously carried out, and when the Dynamic-CurFiberLoss-diff value is not less than 0, the searching is stopped, wherein diff is a loss margin;
4) and (3) testing the broken tested line again by using the test pulse width parameter of the test line obtained in the step 3), and obtaining an alarm positioning position according to the test line result obtained by the new test.
2. The method of claim 1, wherein the alarm reference test line information in step 1) is test parameters, curve point information, event point information, and chain length and loss.
3. The method of claim 2, wherein the test parameters in step 1) are range, wavelength, pulse width, refractive index, non-reflection threshold, end threshold and test duration.
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| CN102882594A (en) * | 2012-10-11 | 2013-01-16 | 北京奥普维尔科技有限公司 | Intelligent optical network topology test method and system |
| CN103973362A (en) * | 2013-02-06 | 2014-08-06 | 中兴通讯股份有限公司 | Method and device for setting OTDR (optical time domain reflectometer) test parameter set |
| CN104215427A (en) * | 2014-10-09 | 2014-12-17 | 南京韦纳迪科技有限公司 | OTDR (optical time domain reflectometry)-based device and method allowing dead zone-free optical fiber monitoring and positioning |
| CN104485992A (en) * | 2014-11-06 | 2015-04-01 | 北京富通亚讯网络信息技术有限公司 | Large-dynamic no-blind zone monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9641243B2 (en) * | 2015-02-23 | 2017-05-02 | Exfo Inc. | Safe-mode OTDR method |
| US10038494B1 (en) * | 2017-02-02 | 2018-07-31 | Infinera Corporation | Proactive multi-layer mechanisms to protect packet-optical transport networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882594A (en) * | 2012-10-11 | 2013-01-16 | 北京奥普维尔科技有限公司 | Intelligent optical network topology test method and system |
| CN103973362A (en) * | 2013-02-06 | 2014-08-06 | 中兴通讯股份有限公司 | Method and device for setting OTDR (optical time domain reflectometer) test parameter set |
| CN104215427A (en) * | 2014-10-09 | 2014-12-17 | 南京韦纳迪科技有限公司 | OTDR (optical time domain reflectometry)-based device and method allowing dead zone-free optical fiber monitoring and positioning |
| CN104485992A (en) * | 2014-11-06 | 2015-04-01 | 北京富通亚讯网络信息技术有限公司 | Large-dynamic no-blind zone monitoring system and method |
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