CN104215427A - OTDR (optical time domain reflectometry)-based device and method allowing dead zone-free optical fiber monitoring and positioning - Google Patents
OTDR (optical time domain reflectometry)-based device and method allowing dead zone-free optical fiber monitoring and positioning Download PDFInfo
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Abstract
The invention discloses an OTDR (optical time domain reflectometry)-based device and method allowing dead zone-free optical fiber monitoring and positioning. The OTDR-based method includes initializing the OTDR, and setting and storing test parameters corresponding to the OTDR in different optical length ranges; testing fiber cores of an optical cable line with the test parameter corresponding to the largest optical length of the OTDR, and initially judging access lengths of the fiber cores; according to the access lengths of the fiber cores, re-selecting and testing the test parameters of the fiber cores; through the re-selected test parameters, re-testing the actual access lengths of the fiber cores of the optical cable. A control system of an OTDR-based optical cable monitoring module is improved, the tested optical lengths are intelligently analyzed, the secondary test parameters suitable to the optical lengths are automatically selected by the OTDR, and the monitoring dead zones of the optical cable are reduced.
Description
Technical field
The present invention relates to fiber-optic monitoring field, particularly relate to the apparatus and method of non-blind area, a kind of fiber optic cable monitor based on OTDR location.
Background technology
Existing OTDR basic test loop, the electric pulse produced by pulse producer, driving light source module produces light pulse, injects testing fiber through directional coupler.Inject the light pulse of optical fiber, the impurity, fine core additive etc. that contain because of inside of optical fibre produce diffuse reflection, the wherein rear orientation light (BACK SCATTERING LIGHT) of partly scattering backward, together with the Fresnel reflection light that chance out-of-flatness fiber end face produces, be reflected back directional coupler together, be incident upon photodiode, convert electric pulse to.Because this intensity of reflected light is faint, therefore repeatedly transmit, collect and carry out amplifying and average treatment.All data processings comprise: the work such as signal amplification, noise filtering, average data process, can control to complete in version at OTDR.Data after process are sent to MCU main control module via bus again.
In traditional optical cable monitoring system, because the detected parameters of OTDR to detected optical fiber detects monitored optical cable according to the initial preset parameter of default, therefore lack of wisdom select to be applicable to survey the detected parameters of fibre core, thus creating the detection and location blind zone problem of OTDR, it cannot solve the fiber failure location within 1000M.
The measuring principle of OTDR is by Emission Lasers impulses injection tested optical fiber, receive the Fresnel reflection light and Rayleigh scattering light that return along former road simultaneously, the various characterisitic parameters of tested optical fiber are obtained after signal transacting, due to inject tested optical fiber be a light pulse, return be reflected signal and scattered signal all with impulse response, when there being reflected light, due to the covering of strong reflection pulse, scattered signal is all submerged, produces and detect " dead band ".So the check frequency precision size of OTDR, the pulsewidth size mainly injected with OTDR determines, the pulsewidth of injection is less, tested optical fiber blind area is less, in theory, the OTDR Event Dead Zone under 100ns pulse width is less than 10m, and blind area of simultaneously decaying is also less with pulsewidth and reduce.
Summary of the invention
In order to solve the problem, the object of this invention is to provide the apparatus and method of non-blind area, a kind of fiber optic cable monitor based on OTDR location, be applicable to the detected parameters of tested optical fiber length by intelligent selection second test, reduce OTDR test position fix blind area, realize fiber optic cable monitor and can locate at more than 50M.
The present invention adopts following technical scheme:
Based on non-blind area, a fiber optic cable monitor location method of OTDR, comprise the following steps:
S1: carry out initialization to OTDR, arranges and stores OTDR test parameter corresponding within the scope of each fiber lengths;
S2: utilize test parameter corresponding to the maximum fiber length of OTDR to test respectively each fibre core in lightguide cable link, the path-length of each fibre core of preliminary judgement;
S3: according to the path-length of each fibre core recorded, the again test parameter of selected each fibre core of test;
S4: by again selected test parameter, test is re-started to the actual path-length of each fibre core in optical cable.
Further, the test parameter described in described step S1 comprises: testing range, test pulsewidth, pendulous frequency, optical fibre refractivity.
Further, the maximum fiber length described in described step S2 is 120km.
Further, 12 fibre cores are comprised at most in the lightguide cable link described in described step S2.
Based on non-blind area, a fiber optic cable monitor location device of OTDR, comprising: pulse producer, light source module, optical directional coupler, connector, photoelectric detector, signal amplification module, signal processor module, master and display apparatus module; The output terminal of described pulse producer is connected with the input end of light source module; The output terminal of described light source module is connected with the input end of optical directional coupler; The data transmission terminal of described optical directional coupler is connected with connector, and its output terminal is connected with the input end of photoelectric detector; Another data transmission terminal of described connector is connected with tested optical cable; The output terminal of described photoelectric detector is connected with signal processor module by signal amplification module; The output terminal of described signal processor module is connected with pulse producer and display apparatus module respectively; The output terminal of described master is connected with pulse producer and signal processor module.
Further, described light source module is LD module.
Further, described signal processor module for realize each fibre core in intelligent second selecting optical cable the fibre core test parameter that is applicable to.
Further, also comprise wireless transport module, for realizing long-range connection and control.
Further, also comprise jtag interface, for the duty of convenient adjustment microprocessor module.
Beneficial effect of the present invention:
The present invention is by improving the control system of fiber optic cable monitor OTDR module, and increase the length of intellectual analysis tested optical fiber, OTDR is applicable to the double measurement parameter of fiber lengths from main separation.Measurement parameter mainly contains range, pulsewidth, pendulous frequency, optical fibre refractivity, and optical fiber measurement precision is by range, and pulsewidth, pendulous frequency determines, measures the larger blind area of pulsewidth larger.
Accompanying drawing explanation
Fig. 1 is the principle schematic of an embodiment of the present invention;
Fig. 2 is the testing process schematic diagram of an embodiment of the present invention;
Fig. 3 is the analytic process schematic diagram of an embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As depicted in figs. 1 and 2, based on non-blind area, a fiber optic cable monitor location device of OTDR, comprising: pulse producer, light source module, optical directional coupler, connector, photoelectric detector, signal amplification module, signal processor module, master, display apparatus module, jtag interface and wireless transport module; Described light source module is LD module, and the output terminal of described pulse producer is connected with the input end of light source module, pulse producer output electric pulse, and electric pulse drives LD module to produce light pulse; The output terminal of described light source module is connected with the input end of optical directional coupler, the data transmission terminal of described optical directional coupler is connected with connector, its output terminal is connected with the input end of photoelectric detector, and another data transmission terminal of described connector is connected with tested optical cable.The light pulse signal that described photoelectrical coupler is sent out for accepting light source module, and light pulse signal is sent in optical cable to be measured by connector test fibre core to be measured, and accept the reflected light of being returned by connector transmission from optical fiber and scattered light; The output terminal of described photoelectric detector is connected with signal processor module by signal amplification module, for carrying out amplification process to reflected light and scattered light; The output terminal of described signal processor module is connected with pulse producer and display apparatus module respectively, signal processor module for realize each fibre core in intelligent second selecting optical cable the fibre core test parameter that is applicable to, and utilize this test parameter to carry out double measurement to corresponding fibre core; The output terminal of described master is connected with pulse producer and signal processor module.Wireless transport module of the present invention is connected with signal processor module, for realizing long-range connection and control.Jtag interface is connected with signal processor module, for the duty of convenient adjustment microprocessor module, and by it, the test parameter that OTDR is corresponding within the scope of each fiber lengths is transferred to signal processor module.
As shown in Figure 2, non-blind area, a kind of location of the fiber optic cable monitor based on OTDR method, comprises the following steps:
S1: carry out initialization to OTDR, arranges and stores OTDR test parameter corresponding within the scope of each fiber lengths; Described test parameter comprises: testing range, test pulsewidth, pendulous frequency, optical fibre refractivity;
S2: utilize test parameter corresponding to the maximum fiber length 120km of OTDR to test respectively each fibre core in lightguide cable link, the path-length of each fibre core of preliminary judgement;
S3: according to the path-length of each fibre core recorded, the again test parameter of selected each fibre core of test;
S4: by again selected test parameter, test is re-started to the actual path-length of each fibre core in optical cable.
12 fibre cores are comprised at most in lightguide cable link described in described step S2.
Embodiment one
As shown in Figure 3, under normal conditions, OTDR adopts the large pulsewidth 10us being applicable to 1 to 4 120km to test optical fiber, when the optical fiber of 120km occurs disconnected fine within 1 to 3 1000m, OTDR still adopts the large pulsewidth 10us of 120km to test, the blind area, location that just there will be within 1000m of tested optical fiber, the data processing method of the present invention to OTDR signal processor module is now adopted to improve, an automatic decision fiber lengths and corresponding detected parameters analytical algorithm is added at data processing module, fiber lengths is judged for the first time, then automatically suitable test parameter (range is selected, pulsewidth), reach the optimization of test parameter.Such as disconnected fine at 800m, OTDR tentatively judges that fiber lengths is 800m, the pulsewidth of OTDR intelligent selection 10ns, the range of 1 kilometer is tested, and the blind area of test is little like this, and precision just improves, the test position fix blind area of optical fiber just can control the rank at 1 to 2 50m, because deduct the initial blind area 50m of OTDR, 1 to 2 scope as shown in Figure 3, namely the length of optical fiber is only greater than 50m and can tests out.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (9)
1., based on non-blind area, a fiber optic cable monitor location method of OTDR, it is characterized in that comprising the following steps:
S1: carry out initialization to OTDR, arranges and stores OTDR test parameter corresponding within the scope of each fiber lengths;
S2: utilize test parameter corresponding to the maximum fiber length of OTDR to test respectively each fibre core in lightguide cable link, the path-length of each fibre core of preliminary judgement;
S3: according to the path-length of each fibre core recorded, the again test parameter of selected each fibre core of test;
S4: by again selected test parameter, test is re-started to the actual path-length of each fibre core in optical cable.
2. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 1 method, is characterized in that: the test parameter described in step S1 comprises: testing range, test pulsewidth, pendulous frequency, optical fibre refractivity.
3. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 1 method, is characterized in that: the maximum fiber length described in step S2 is 120km.
4. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 1 method, is characterized in that: comprise at most 12 fibre cores in the lightguide cable link described in step S2.
5., based on non-blind area, a fiber optic cable monitor location device of OTDR, it is characterized in that comprising: pulse producer, light source module, optical directional coupler, connector, photoelectric detector, signal amplification module, signal processor module, master and display apparatus module; The output terminal of described pulse producer is connected with the input end of light source module; The output terminal of described light source module is connected with the input end of optical directional coupler; The data transmission terminal of described optical directional coupler is connected with connector, and its output terminal is connected with the input end of photoelectric detector; Another data transmission terminal of described connector is connected with tested optical cable; The output terminal of described photoelectric detector is connected with signal processor module by signal amplification module; The output terminal difference pulse producer of described signal processor module is connected with display apparatus module; The output terminal of described master is connected with pulse producer and signal processor module.
6. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 5 device, is characterized in that: described light source module is LD module.
7. non-blind area, a kind of fiber optic cable monitor based on OTDR location according to claim 5 device, is characterized in that: described signal processor module for realize each fibre core in intelligent second selecting optical cable the fibre core test parameter that is applicable to.
8. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 5 device, is characterized in that: also comprise wireless transport module, for realizing long-range connection and control.
9. non-blind area, a kind of location of the fiber optic cable monitor based on OTDR according to claim 5 device, is characterized in that: also comprise jtag interface, for the duty of convenient adjustment microprocessor module.
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| CN109004973A (en) * | 2018-07-04 | 2018-12-14 | 广州广电计量检测股份有限公司 | A kind of OTDR capability evaluating device and method |
| CN109407514A (en) * | 2018-12-14 | 2019-03-01 | 武汉理工光科股份有限公司 | The device and method of φ-OTDR system parameter can be automatically adjusted |
| CN109547099A (en) * | 2018-11-22 | 2019-03-29 | 桂林聚联科技有限公司 | A method of for the adaptive pulsewidth detection of OTDR module in fiber optic cable monitor |
| CN115021804A (en) * | 2022-05-31 | 2022-09-06 | 广东电网有限责任公司 | Long-distance communication optical cable fault positioning method and related device |
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| CN115021804A (en) * | 2022-05-31 | 2022-09-06 | 广东电网有限责任公司 | Long-distance communication optical cable fault positioning method and related device |
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