CN203708254U - ONU state testing instrument applied to passive optical network testing - Google Patents
ONU state testing instrument applied to passive optical network testing Download PDFInfo
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- CN203708254U CN203708254U CN201420039912.5U CN201420039912U CN203708254U CN 203708254 U CN203708254 U CN 203708254U CN 201420039912 U CN201420039912 U CN 201420039912U CN 203708254 U CN203708254 U CN 203708254U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 103
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000012795 verification Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 description 16
- 238000001914 filtration Methods 0.000 description 4
- 238000000253 optical time-domain reflectometry Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses an ONU state testing instrument applied to passive optical network testing, which is composed of a 2*2 optical splitter, an optical power measurement module, an optical time domain reflectometer, a burst signal optical power measurement module and an integrated processing unit module, wherein a port S3 of the 2*2 optical splitter is connected to the optical power measurement module, a port S4 is connected to the optical time domain reflectometer and the burst signal optical power measurement module, and the integrated processing unit module is connected with the optical power measurement module, the optical time domain reflectometer and the burst signal optical power measurement module. The ONU state testing instrument has the advantages that only one instrument is required to possess functions of measuring the power of optical signals of a passive optical network and measuring breaking points of an optical fiber circuit, meanwhile, a maintainer can test the ONU state of the passive optical network without entering a user house, and the maintenance efficiency is high; 1310nm burst signal optical power measurement and optical time domain reflectometer measurement share a receiving circuit; and an amplifier with a small bandwidth is used.
Description
Technical field
The utility model relates to optical communication tester, particularly a kind of ONU state verification instrument for EPON test.
Background technology
Along with fiber-to-the-home universal, the workload that EPON is safeguarded is increasing, in EPON the most difficult maintenance be last kilometer of part.In EPON, ONU is usually placed in user family, and in a lot of situations, attendant is but inconvenient to register one's residence and is carried out ONU to test and patrol and examine.
The common instrument of safeguarding at present EPON is PON light power meter and optical time domain reflectometer.PON light power meter can be tested from the 1490nm signal light power of OLT direction with from the 1310nm burst luminous power of ONU direction; Optical time domain reflectometer can measuring fiber circuit operating state.
PON light power meter and optical time domain reflectometer are the instruments of two platform independent at present, and they can not directly accurately provide the operating state of ONU.Such as: in the time using PON light power meter to test not from 1310nm signal light power, actually or attendant can not judge the ONU power down because optical fiber has broken, or because ONU is not connected on optical fiber.Whether use optical time domain reflectometer can test out fibre circuit normal, but can not directly distinguish ONU in power-down state or in not being connected to the state of fibre circuit, optical time domain reflectometer can not judge whether ONU exists fault.
While measuring at present 1310nm burst luminous power, adopt method as publication number be described in CN1833384 " for the method and apparatus of testing optical network ", CN201409137 " light power meter of testing passive optical network ", need to use the peak pulse amplitude of ranging pulse light signal after wide-bandwidth amplifier amplifying signal, circuit design is comparatively complicated.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, and provide a kind of without entering in the situation of user's family, just can test out connection status and the operating state of EPON ONU, the ONU state verification instrument for EPON test that maintenance efficiency is higher.
The purpose of this utility model is to realize by following technical scheme:
For an ONU state verification instrument for EPON test, formed by 2 × 2 optical branching devices, measuring light power module, optical time domain reflectometer and burst measuring light power module and integrated treatment unit module;
The port S3 of 2 × 2 optical branching devices is connected to measuring light power module, and the light signal that OLT direction is come is passed in measuring light power module; The port S4 of 2 × 2 optical branching devices is connected to optical time domain reflectometer and burst measuring light power module, and the light signal that ONU direction is come outputs in optical time domain reflectometer and burst measuring light power module; Integrated treatment unit module is connected with measuring light power module, optical time domain reflectometer and burst measuring light power module.
Described optical time domain reflectometer and burst measuring light power module are made up of 1 × 2 optical branching device, laser diode, pulse generator, photodetector, transreactance amplifier, A/D converter and controller,
The common port of 1 × 2 optical branching device is the light signal input/output end port of this module, one of them of 1 × 2 optical branching device point road port is connected to photodetector, photodetector and transreactance amplifier, A/D converter, controller, pulse generator, laser diode are linked in sequence, and laser diode is connected with another point of road port of 1 × 2 optical branching device;
After the photoelectric current of photodetector output is amplified by transreactance amplifier, give A/D converter and carry out mould/number conversion, another point of road port of 1 × 2 optical branching device is connected to laser diode, and pulse generator is controlled by the controller and driving laser diode.
The splitting ratio of described 2 × 2 optical branching devices is 30:70.
Described measuring light power module is made up of 1490nm filter and an average light power measurement module.
Burst measuring light power module in described optical time domain reflectometer and burst measuring light power module is 1310nm burst measuring light power module.
The bandwidth of described transreactance amplifier is 25MHz.
The sampling frequency of described A/D converter is 50MHz.
This tester is by 2 × 2 optical branching devices, measures in the mode being connected in series in the optical link of EPON.
It measures the 1490nm signal light power from OLT direction by 1490nm measuring light power module.This module comprises a 1490nm optical signal filtering device, and the light signal beyond filtering 1490nm light signal, measures the 1490nm signal light power from OLT direction to measure average light power mode.
It measures the 1310nm burst luminous power from ONU direction by optical time domain reflectometer and 1310nm burst measuring light power module.
In the time measuring 1310nm burst luminous power lower than-40dBm, start OTDR and measure the fibre circuit of ONU direction, according to the return loss value of fibre circuit distal point, judge the type of this distal point: fibre circuit breakpoint or ONU end points; If fibre circuit breakpoint, report breakpoint location; If ONU end points, the state of report ONU: power down or be not connected to fibre circuit.
In optical time domain reflectometer and 1310nm burst measuring light power module, share receiving circuit (being formed by 1 × 2 optical branching device, a photodetector, a transreactance amplifier, an A/D converter, a controller) and carry out 1310nm burst measuring light power and optical time domain reflectometer measurement, carry out different measurements with time-sharing format.
While carrying out 1310nm burst measuring light power, controller is got the data in 0.5 second continuously from A/D converter, finds out maximum and minimum value in these data.The difference of these two values is the half of 1310nm burst packet peak-to-peak value, obtains 1310nm burst optical power value from this value correspondence.
The utility model has the advantages that: only need an instrument, just possess and measure the function of each optical signal power of EPON and the function of measuring optical fiber line break-point test, attendant just can test out the state of EPON ONU in the situation that not entering user house simultaneously, and maintenance efficiency is higher; 1310nm burst measuring light power and optical time domain reflectometer are measured and are shared receiving circuit; Use the amplifier of less bandwidth.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment;
Fig. 2 is the structural representation of optical time domain reflectometer and burst measuring light power module in Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the utility model content is further elaborated, but is not that the utility model is limited.
Embodiment:
As shown in Figure 1, a kind of ONU state verification instrument for EPON test, is made up of 2 × 2 optical branching devices 1, measuring light power module 2, optical time domain reflectometer and burst measuring light power module 3 and integrated treatment unit module 4;
The port S3 of 2 × 2 optical branching devices 1 is connected to measuring light power module 2, and the light signal that OLT direction is come is passed in measuring light power module 2; The port S4 of 2 × 2 optical branching devices 1 is connected to optical time domain reflectometer and burst measuring light power module 3, the light signal that ONU direction is come outputs in optical time domain reflectometer and burst measuring light power module 3, and optical time domain reflectometer is connected in the optical fiber that is connected ONU via port S4, port S1 with the light signal of optical time domain reflectometer in burst measuring light power module 3; Integrated treatment unit module 4 is connected with measuring light power module 2, optical time domain reflectometer and burst measuring light power module 3.
As shown in Figure 2, optical time domain reflectometer and burst measuring light power module 3 are by 1 × 2 optical branching device 5, laser diode 10, pulse generator 11, photodetector 6, transreactance amplifier 7, A/D converter 8 and controller 9 form, the common port of 1 × 2 optical branching device 5 is the light signal input/output end port of optical time domain reflectometer and burst measuring light power module 3, one of them of 1 × 2 optical branching device 5 point road port is connected to photodetector 6, photodetector 6 and transreactance amplifier 7, A/D converter 8, controller 9, pulse generator 11, laser diode 10 is linked in sequence, laser diode 10 is connected with another point of road port of 1 × 2 optical branching device 5,
The photoelectric current that photodetector 6 is exported is given A/D converter 8 after being amplified by transreactance amplifier 7 and is carried out mould/number conversion, and the controlled device 9 of pulse generator 11 is controlled and driving laser diode 10.
The splitting ratio of 2 × 2 optical branching devices 1 is 30:70.
The splitting ratio of 1 × 2 optical branching device 5 is 50:50.
Measuring light power module 2 is made up of 1490nm filter and an average light power measurement module.Light signal beyond 1490nm optical signal filtering device filtering 1490nm light signal.It measures the 1490nm signal light power from OLT direction.
Burst measuring light power module in optical time domain reflectometer and burst measuring light power module 3 is 1310nm burst measuring light power module.
The bandwidth of transreactance amplifier 7 is 25MHz.
The sampling frequency of A/D converter 8 is 50MHz.
Integrated treatment unit module 4 comprises the omnibus circuit parts such as demonstration, key-press input.
Particularly, this tester is by 2 × 2 optical branching devices 1, measures in the mode being connected in series in the optical link of EPON.It measures the 1490nm signal light power from OLT direction by 1490nm measuring light power module, measures the 1490nm signal light power from OLT direction to measure average light power mode.The port S2 of 2 × 2 optical branching devices 1 is connected to the fibre circuit from OLT direction, and port S1 is connected to the fibre circuit from ONU direction, and such connected mode is connected in series to ONU state verification instrument in the fibre circuit of OLT to ONU.Signal from OLT is inputted from port S2, and after 2 × 2 optical branching devices 1, from port, S1 outputs to ONU; From ONU signal from port S1 input, after 2 × 2 optical branching devices 1, from port, S2 outputs to OLT; Signal from OLT is inputted from port S2, after 2 × 2 optical branching devices 2, outputs to 1490nm measuring light power module 2 inputs from port S3; Signal from ONU is inputted from port S2, after 2 × 2 optical branching devices 2, outputs to the light signal input/output terminal of optical time domain reflectometer and 1310nm burst measuring light power module 3 from port S4; The light signal of optical time domain reflectometer is connected in the optical fiber that connects ONU via port S4, port S1.
The splitting ratio of 2 × 2 optical branching devices 1 is 30:70, that is: from 100% signal of port S2 input, outputing to port S1 is 70%, and outputing to port S3 is 30%; From 100% signal of port S1 input, outputing to port S2 is 70%, and outputing to port S4 is 30%.
The common port of 1 × 2 optical branching device 5 is the light signal input/output end port of this module, and one of them of 1 × 2 optical branching device 5 point road port is connected to photodetector 6.The photoelectric current that photodetector 6 is exported is given A/D converter 8 after being amplified by transreactance amplifier 7 and is carried out mould/number conversion.Another point of road port of 1 × 2 optical branching device 5 is connected to laser diode 10, and the controlled device 9 of pulse generator 11 is controlled and driving laser diode 10.
While carrying out 1310nm burst measuring light power, controller 9 is got the data in 0.5 second continuously from A/D converter 8, finds out maximum and minimum value in these data.The difference of these two values is the half of 1310nm burst packet peak-to-peak value, obtains 1310nm burst optical power value from this value correspondence.
Carry out 1310nm burst measuring light power and optical time domain reflectometer test with time-sharing format.In the time measuring 1310nm burst luminous power lower than-40dBm, start OTDR and measure the fibre circuit of ONU direction.OTDR measurement result comprises distance parameter and the return wave loss parameter of optical link distal point.According to the return loss value size of fibre circuit distal point, judge the type of this distal point: fibre circuit breakpoint (return loss value > 38dB) or ONU end points (return loss value≤38dB); If fibre circuit breakpoint, report breakpoint location; If ONU end points, the state of report ONU: power down (25 dB≤return loss value≤38dB) or be not connected to fibre circuit (return loss value < 25dB).
Claims (8)
1. for an ONU state verification instrument for EPON test, it is characterized in that: formed by 2 × 2 optical branching devices, measuring light power module, optical time domain reflectometer and burst measuring light power module and integrated treatment unit module;
The port S3 of 2 × 2 optical branching devices is connected to measuring light power module, and the light signal that OLT direction is come is passed in measuring light power module; The port S4 of 2 × 2 optical branching devices is connected to optical time domain reflectometer and burst measuring light power module, and the light signal that ONU direction is come outputs in optical time domain reflectometer and burst measuring light power module; Integrated treatment unit module is connected with measuring light power module, optical time domain reflectometer and burst measuring light power module.
2. ONU state verification instrument according to claim 1, it is characterized in that: described optical time domain reflectometer and burst measuring light power module are made up of 1 × 2 optical branching device, laser diode, pulse generator, photodetector, transreactance amplifier, A/D converter and controller
The common port of 1 × 2 optical branching device is the light signal input/output end port of this module, one of them of 1 × 2 optical branching device point road port is connected to photodetector, photodetector and transreactance amplifier, A/D converter, controller, pulse generator, laser diode are linked in sequence, and laser diode is connected with another point of road port of 1 × 2 optical branching device;
After the photoelectric current of photodetector output is amplified by transreactance amplifier, give A/D converter and carry out mould/number conversion, another point of road port of 1 × 2 optical branching device is connected to laser diode, and pulse generator is controlled by the controller and driving laser diode.
3. ONU state verification instrument according to claim 1, is characterized in that: the splitting ratio of described 2 × 2 optical branching devices is 30:70.
4. ONU state verification instrument according to claim 1, is characterized in that: described measuring light power module is made up of 1490nm filter and an average light power measurement module.
5. ONU state verification instrument according to claim 1, is characterized in that: the burst measuring light power module in described optical time domain reflectometer and burst measuring light power module is 1310nm burst measuring light power module.
6. ONU state verification instrument according to claim 2, is characterized in that: the bandwidth of described transreactance amplifier is 25MHz.
7. ONU state verification instrument according to claim 2, is characterized in that: the sampling frequency of described A/D converter is 50MHz.
8. ONU state verification instrument according to claim 2, is characterized in that: the splitting ratio of described 1 × 2 optical branching device is 50:50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039912.5U CN203708254U (en) | 2014-01-22 | 2014-01-22 | ONU state testing instrument applied to passive optical network testing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039912.5U CN203708254U (en) | 2014-01-22 | 2014-01-22 | ONU state testing instrument applied to passive optical network testing |
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| CN203708254U true CN203708254U (en) | 2014-07-09 |
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| CN201420039912.5U Expired - Lifetime CN203708254U (en) | 2014-01-22 | 2014-01-22 | ONU state testing instrument applied to passive optical network testing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763023A (en) * | 2014-01-22 | 2014-04-30 | 桂林聚联科技有限公司 | ONU state tester for passive optical network test |
| CN104113373A (en) * | 2014-07-22 | 2014-10-22 | 桂林聚联科技有限公司 | Optical fiber connection point state determining method |
| CN104967479A (en) * | 2015-07-01 | 2015-10-07 | 中国电信股份有限公司南京分公司 | Detector and test method for optical fiber breakpoint in EPON (Ethernet Passive Optical Network) |
-
2014
- 2014-01-22 CN CN201420039912.5U patent/CN203708254U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763023A (en) * | 2014-01-22 | 2014-04-30 | 桂林聚联科技有限公司 | ONU state tester for passive optical network test |
| CN104113373A (en) * | 2014-07-22 | 2014-10-22 | 桂林聚联科技有限公司 | Optical fiber connection point state determining method |
| CN104967479A (en) * | 2015-07-01 | 2015-10-07 | 中国电信股份有限公司南京分公司 | Detector and test method for optical fiber breakpoint in EPON (Ethernet Passive Optical Network) |
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Granted publication date: 20140709 |
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| CX01 | Expiry of patent term |