CN102088315B - Optical fiber failure positioning system and method - Google Patents

Optical fiber failure positioning system and method Download PDF

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Publication number
CN102088315B
CN102088315B CN201110066960.4A CN201110066960A CN102088315B CN 102088315 B CN102088315 B CN 102088315B CN 201110066960 A CN201110066960 A CN 201110066960A CN 102088315 B CN102088315 B CN 102088315B
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China
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test light
optical fiber
dynamic range
fiber
power loss
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CN201110066960.4A
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CN102088315A (en
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付勇
王伟
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BEIJING STAMINA TECHNOLOGY Co Ltd
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BEIJING STAMINA TECHNOLOGY Co Ltd
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Abstract

The invention relates to an optical fiber failure positioning system and method. The optical fiber failure positioning method comprises the following steps of: sending out testing light at preset pulse width and pulse time interval to be transmitted in an optical fiber to be detected; detecting the power loss of the testing light; initially determining the failure position of the optical fiber according to the power loss of the testing light; determining a dynamic range of the testing light according to the power loss of the testing light; estimating a dynamic range of secondary testing light required when the optical fiber to be detected is monitored for the second time according to the initially determined failure position of the optical fiber; re-determining the pulse width and the pulse time interval according to the relationship among the dynamic range of the testing light, the pulse width and the pulse time interval; sending out secondary testing light at the re-determined pulse width and the pulse time interval to be transmitted in the optical fiber to be detected; detecting the power loss of the secondary testing light; and positioning the secondary failure for the optical fiber to be detected according to the power loss of the secondary testing light. By adopting the system and the method, the accuracy of optical fiber failure positioning can be improved.

Description

Optical fiber failure positioning system and method
Technical field
The application relates to a kind of fault location system, relates in particular to a kind of optical fiber failure positioning system and method.
Background technology
In recent years, Fibre Optical Communication Technology has obtained greatly developing, and optical fiber communication has not only realized remote transmission signal, and the stable performance of signal transmission.In fiber-optic monitoring technology, by placing light source to send test light at client's far-end, test light in the optical fiber of tested client, propagate after by OTDR (Optical Time Domain Reflectometer, optical time domain reflectometer) receive, because light is propagated meeting because decay appears in scattering in optical fiber, whether OTDR just can analyze tested optical fiber by the power attenuation situation of analytical test light and occur extremely, according to the range of test light, the parameters such as pulsewidth determine that abnormal position appears in optical fiber, although this mode is located and has been proposed solution for fiber failure, but positioning precision is inadequate, after location, also need maintainer to spend further investigation fault point of plenty of time.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, using this as the preorder in greater detail of discussing after a while.
The optical fiber failure positioning system and the method that provide a kind of fault location precision high are provided a main purpose of the present invention.
According to an aspect of the present invention, a kind of optical fiber failure positioning system, comprising:
Optical transmitting set, for sending first test light to transmit at testing fiber with predetermined pulse width and pulse interval to testing fiber;
Luminous power detector, for being received in the test light first after testing fiber transmission and detecting the power loss of test light first;
Fault location module, for tentatively determining the abort situation of optical fiber according to the power loss of described test light first;
Dynamic range detection module, for determining the dynamic range of test light first according to the power loss of described test light first;
Dynamic range is estimated module, for estimating the dynamic range of testing fiber being carried out to the second test light of secondary monitoring according to the preliminary abort situation of determining optical fiber; And
Parameter is reseted module, for redefining pulse duration and pulse interval according to the relation between the dynamic range of test light, pulse duration and pulse interval, make described optical transmitting set send described second test light and transmit in testing fiber with the pulse duration and the pulse interval that redefine, described luminous power detector detects the power loss of the second test light after transmission in testing fiber, and described fault location module is carried out secondary failure location according to the power loss of described second test light to testing fiber.
According to an aspect of the present invention, a kind of fiber failure localization method comprises:
Send first test light to transmit with predetermined pulse width and pulse interval to testing fiber in testing fiber;
Be received in testing fiber the test light first after transmission and detect the power loss of test light first;
Tentatively determine the abort situation of optical fiber according to the power loss of described test light first;
The dynamic range of test light first described in determining according to the power loss of described test light first;
Estimate the dynamic range of second test light required when testing fiber is carried out to secondary monitoring according to the abort situation of preliminary definite optical fiber;
Redefine pulse duration and pulse interval according to the relation between the dynamic range of test light, pulse duration and pulse interval;
Send second test light to transmit with the pulse duration and the pulse interval that redefine in testing fiber, so that testing fiber is carried out to secondary monitoring;
Detect the power loss of the second test light after transmission in testing fiber; And
According to the power loss of second test light, testing fiber is carried out to secondary failure location.
Optical fiber failure positioning system of the present invention and method are carried out secondary monitoring to reach the object of secondary failure location to testing fiber, by estimating the dynamic range of second test light, when the secondary obtaining according to the relation between test light dynamic range and its pulse pulse duration and pulse interval is monitored, pulse duration and the time interval of the pulse signal of test light all dwindle, pulse duration is less, energy is less, resolution is higher, the monitoring blind area producing is also less, pulse interval is less, the error producing is also less, therefore, testing fiber is carried out to secondary monitoring and reduced monitoring blind area and error, improve the precision of fault location.
Brief description of the drawings
Below with reference to the accompanying drawings illustrate embodiments of the invention, can understand more easily above and other objects, features and advantages of the present invention.Parts in accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, same or similar technical characterictic or parts will adopt same or similar Reference numeral to represent.
Fig. 1 is the block diagram of optical fiber failure positioning system preferred embodiments of the present invention.
Fig. 2 A and Fig. 2 B are the curve of the power loss after test light is transmitted in testing fiber.
Fig. 3 is the flow chart of fiber failure localization method preferred embodiments of the present invention.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.The element of describing in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with element and feature shown in one or more other accompanying drawing or execution mode.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.
Please refer to Fig. 1, the preferred embodiments of optical fiber failure positioning system of the present invention comprises that optical transmitting set 10, luminous power detector 20, fault location module 30, dynamic range detection module 40, dynamic range are estimated module 50 and parameter is reseted module 60.
Optical transmitting set 10 is for launching first test light to transmit so that testing fiber is tentatively monitored at testing fiber to testing fiber, the light pulse signal with predetermined pulse width and pulse interval that test light is fixed qty first, optical transmitting set 10 sends test light first with this predetermined pulse width and pulse interval to testing fiber.
Luminous power detector 20 is for being received in the test light first after testing fiber transmission and detecting the power loss of test light first.
Fault location module 30 is for the basis abort situation of the tentatively definite optical fiber of power loss of test light first, please refer to Fig. 2 A and 2B, generally, light in optical fiber propagation meeting because power loss appears in scattering, when fracture appears in optical fiber position, fusion points etc. can cause when signal transmits discontinuous phenomenon, the curve of catoptrical power loss there will be the anomaly such as angle and curved or spike as shown in Figure 2 B as shown in Figure 2 A, fault location module 30 judges whether optical fiber breaks down and occurs the abnormal corresponding abort situation of location positioning optical fiber according to the curve of power loss by observing the power loss curve of test light first.
Dynamic range detection module 40 is for determining the dynamic range of test light first, dynamic range detection module 40 is basis definite dynamic ranges of test light first of curve of the power loss of test light first, for example, in Fig. 2 A, the dynamic range of test light is the poor of maximum power value A1 and minimal power values A2 first.
Because the dynamic range of test light is larger, range when test light monitoring testing fiber is also larger, and the positioning precision of abort situation is also lower, and in order to improve positioning precision, optical fiber failure positioning system of the present invention carries out secondary location to abort situation.Dynamic range is estimated module 50 and is redefined the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the abort situation of fault location module 30 determined optical fiber, and estimate the dynamic range of required second test light of secondary when location according to secondary monitoring distance, above-mentioned secondary monitoring distance can be the product of fault location module 30 determined abort situation and coefficient in the time monitoring for the first time, as, abort situation is multiplied by 1.2, secondary monitoring distance is less than the range of test light while monitoring for the first time, is less than the monitoring distance while monitoring for the first time.
Owing to thering is following relation between the dynamic range of test light, pulse duration, pulse interval: unit of the every minimizing of dynamic range of test light, pulse interval dwindles 4 times, and the number of pulses of sending in the unit interval expands 4 times; Unit of the every minimizing of dynamic range of test light, its pulse duration is dwindled 2 times, and the dynamic range of a unit can be theoretical 1.5dB, also can be the actual value of obtaining by experiment.With theoretical value, 1.5dB is illustrated, and when the dynamic range of test light reduces 4.5dB, while reducing by 3 units, pulse interval dwindles 4 3doubly, pulse duration dwindles 2 3doubly.
Parameter is reseted module 60 and is redefined pulse duration and pulse interval according to the above-mentioned relation between the dynamic range of test light, pulse duration and pulse interval.
Optical transmitting set 10 resets with parameter the pulse duration that module 60 redefines and pulse interval sends second test light and in testing fiber transmission so that testing fiber is carried out to secondary monitoring, luminous power detector 20 detects the power loss of second test light, fault location module 30 is carried out secondary failure location to upgrade fault alarm information according to the power loss of second test light to testing fiber, facilitates the follow-up maintenance to testing fiber.
Please refer to Fig. 3, the preferred embodiments of fiber failure localization method of the present invention comprises the following steps:
Step S1: optical transmitting set 10 sends first test light to transmit in testing fiber, so that testing fiber is tentatively monitored with predetermined pulse width and pulse interval to testing fiber.
Step S2: luminous power detector 20 is received in testing fiber the test light first after transmission and detects the power loss of test light first.
Step S3: fault location module 30 bases are the abort situation of the tentatively definite optical fiber of power loss of test light first, in this step, fault location module 30 is by observing the abort situation of the tentatively definite optical fiber of curve of the power loss of test light first.
Step S4: the dynamic range detection module 40 bases first power loss of test light are determined the dynamic range of test light first, in this step, dynamic range detection module 40 is the curve by observing the power loss of test light first dynamic ranges of determining test light first.
Step S5: dynamic range is estimated module 50 and redefined the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the abort situation of the preliminary definite optical fiber of fault location module 30, and estimate the dynamic range of required second test light of secondary when monitoring according to secondary monitoring distance, above-mentioned secondary monitoring distance is less than range when testing fiber is tentatively monitored, and is less than the monitoring distance of preliminary monitoring.
Step S6: parameter is reseted module 60 and redefined pulse duration and pulse interval according to the relation between the dynamic range of test light, pulse duration and pulse interval.
Step S7: optical transmitting set 10 sends second test light to transmit in testing fiber with the pulse duration and the pulse interval that redefine in step S6, so that testing fiber is carried out to secondary monitoring.
Step S8: luminous power detector 20 is received in testing fiber the second test light after transmission and detects the power loss of second test light.
Step S9: fault location module 30 is carried out secondary failure location according to the power loss of two test light to testing fiber.
Because secondary monitoring distance is less than while monitoring for the first time the range of test light first, the dynamic range of two test light of secondary monitoring also diminishes, pulse duration and the pulse interval of the second test light obtaining according to the pulse duration of test light dynamic range and its pulse signal and the above-mentioned relation between the time interval all dwindle, the pulse duration of pulse signal is less, energy is less, resolution is higher, the monitoring blind area producing is also less, the time interval of pulse signal is less, the error producing is also less, therefore, testing fiber is carried out to secondary monitoring and reduced monitoring blind area and error, improve the precision of fault location.Optical fiber failure positioning system of the present invention and method can be applicable in OTDR.
In equipment of the present invention and method, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.The step that also it is pointed out that the above-mentioned series of processes of execution can order naturally following the instructions be carried out in chronological order, but does not need necessarily to carry out according to time sequencing.Some step can walk abreast or carry out independently of one another.Simultaneously, in the above in the description of the specific embodiment of the invention, describe and/or the feature that illustrates can be used in same or similar mode in one or more other execution mode for a kind of execution mode, combined with the feature in other execution mode, or substitute the feature in other execution mode.

Claims (8)

1. an optical fiber failure positioning system, is characterized in that, comprising:
Optical transmitting set, for sending first test light to transmit at testing fiber with predetermined pulse width and pulse interval to testing fiber;
Luminous power detector, for being received in the test light first after testing fiber transmission and detecting the power loss of test light first;
Fault location module, for tentatively determining the abort situation of optical fiber according to the power loss of described test light first;
Dynamic range detection module, for determining the dynamic range of test light first according to the power loss of described test light first;
Dynamic range is estimated module, for estimating the dynamic range of testing fiber being carried out to the second test light of secondary monitoring according to the preliminary abort situation of determining optical fiber; And
Parameter is reseted module, for redefining pulse duration and pulse interval according to the relation between the dynamic range of test light, pulse duration and pulse interval, make described optical transmitting set send described second test light and transmit in testing fiber with the pulse duration and the pulse interval that redefine, described luminous power detector detects the power loss of the second test light after transmission in testing fiber, and described fault location module is carried out secondary failure location according to the power loss of described second test light to testing fiber.
2. optical fiber failure positioning system as claimed in claim 1, it is characterized in that, described dynamic range is estimated module and is redefined the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the abort situation of the preliminary definite optical fiber of fault location module, and estimates the dynamic range of described second test light according to described secondary monitoring distance.
3. optical fiber failure positioning system as claimed in claim 2, it is characterized in that, described secondary monitoring distance is the preliminary definite abort situation of optical fiber and the product of a coefficient of described fault location module, the range of test light first described in described secondary monitoring distance is less than.
4. optical fiber failure positioning system as claimed in claim 1, it is characterized in that, described fault location module is tentatively determined the abort situation of optical fiber according to the curve of the power loss of described test light first, described dynamic range detection module is determined the dynamic range of test light first according to the curve of the power loss of described test light first.
5. a fiber failure localization method, is characterized in that, comprising:
Send first test light to transmit with predetermined pulse width and pulse interval to testing fiber in testing fiber;
Be received in testing fiber the test light first after transmission and detect the power loss of test light first;
Tentatively determine the abort situation of optical fiber according to the power loss of described test light first;
The dynamic range of test light first described in determining according to the power loss of described test light first;
Estimate the dynamic range of second test light required when testing fiber is carried out to secondary monitoring according to the abort situation of preliminary definite optical fiber;
Redefine pulse duration and pulse interval according to the relation between the dynamic range of test light, pulse duration and pulse interval;
Send second test light to transmit with the pulse duration and the pulse interval that redefine in testing fiber, so that testing fiber is carried out to secondary monitoring;
Detect the power loss of the second test light after transmission in testing fiber; And
According to the power loss of second test light, testing fiber is carried out to secondary failure location.
6. fiber failure localization method as claimed in claim 5, it is characterized in that, the step of the described dynamic range of estimating second test light required when testing fiber is carried out to secondary monitoring comprises: redefine the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the abort situation of described preliminary definite optical fiber, and estimate the dynamic range of described second test light according to described secondary monitoring distance.
7. fiber failure localization method as claimed in claim 6, it is characterized in that, described in redefine the step that testing fiber is carried out to the secondary monitoring distance of secondary monitoring and comprise the abort situation of tentatively definite optical fiber and a multiplication to obtain described secondary monitoring distance.
8. fiber failure localization method as claimed in claim 5, it is characterized in that, the step of the described preliminary abort situation of determining optical fiber comprises the abort situation of tentatively determining optical fiber according to the curve of the power loss of described test light first, described determine described in first the step of the dynamic range of test light comprise according to the curve of the power loss of described test light first and determine the dynamic range of test light first.
CN201110066960.4A 2011-03-18 2011-03-18 Optical fiber failure positioning system and method Expired - Fee Related CN102088315B (en)

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