CN101814948A - Optical network unit and anomaly detection and power monitoring method thereof - Google Patents
Optical network unit and anomaly detection and power monitoring method thereof Download PDFInfo
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- CN101814948A CN101814948A CN200910007782A CN200910007782A CN101814948A CN 101814948 A CN101814948 A CN 101814948A CN 200910007782 A CN200910007782 A CN 200910007782A CN 200910007782 A CN200910007782 A CN 200910007782A CN 101814948 A CN101814948 A CN 101814948A
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Abstract
The invention discloses an optical network unit, which comprises an optical transmitter, an optical detector and a signal measurement module. The optical transmitter transmits light signals to an optical line apparatus of a passive optical network system; the optical detector is used for monitoring the transmission of the optical signals and sending out the current signals; the signal measurement module is connected with the optical detector, converts the current signals into voltage signals, filters and samples the voltage signals and generates sampled signals; and the voltages of the sampled signals are averaged to obtain the average output power of the optical transmitter. When the packet uploaded by the optical network unit exceeds the time interval of the allocated timeslot, the sampled signals exceed the threshold at multiple continuous points, and the optical transmitter is shut off. The invention also discloses an anomaly detection and a power monitoring method of the optical network unit.
Description
Technical field
The present invention is about a kind of EPON (Passive Optical Network that is applied to, PON) optical network unit in the system and abnormality detection thereof and power monitor method, can learn that at the optical network unit end package of uploading surpasses the distribution time slots at interval, and calculate the average output power of light signal.
Background technology
Fig. 1 is the schematic diagram of general passive optical network.At EPON (Passive OpticalNetwork, PON) in the system 10, several optical network units (Optical Network Unit, ONU) 11～14 be arranged in the office or family of corresponding number, and utilize optical fibre coupling to splitter 15, to be connected to optowire equipment (Optical Line Terminal, OLT) 16 more respectively.
In other words, client (ONU) is connected to the optical channel of local side jointly in the mode of time division multiplexing, and the receiver of local side (OLT) then receives the light signal that comes from different clients when uploading.Habitually in the past for the problem diagnosis of burst mode (burst mode) data of client output all at local side, diagnose at the signal of each client output by being worth expensive equipment, and can not directly diagnose one by one to client with this expensive equipment.When the package of client upload surpasses distribution time slots interval, the running of transmission system will be injured.
Summary of the invention
Because above-mentioned problem, a purpose of the present invention is for providing a kind of optical network unit and method for detecting abnormality thereof, when the package of uploading surpasses distribution time slots interval, can close light signal at once at the optical network unit end, avoid the optical fiber of its input passive optical network.
Another object of the present invention can be learnt the average output power of light transmission for a kind of power monitor method of optical network unit is provided at the optical network unit end.
For reaching above-mentioned purpose, the invention provides a kind of optical network unit, in passive optical network, comprise a plurality of optical network units, optical network unit comprises light emission submodule and signal measurement module.Light emission submodule comprises light transmission and photodetector.The transmitter transmits light light signal is to the optowire equipment of passive optical network.Photodetector and sends current signal in order to the monitoring optical signal transmitting.Signal measurement module is connected with photodetector, and current signal is converted to voltage signal, and voltage signal is carried out filtering, sampling, produces sampled signal.
Optical network unit also comprises controller, is connected with analog-digital converter, and the package of uploading when optical network unit surpasses when distributing time slots at interval, when the continuous multiple spot of sampled signal surpasses door, closes the light signal of light transmission.
The present invention also provides a kind of method for detecting abnormality of optical network unit, and it may further comprise the steps: light transmission is provided, and light transmission is in order to upload the optowire equipment of light signal to passive optical network; Photodetector is provided,, and sends current signal in order to the monitoring optical signal transmitting; Current signal is converted to voltage signal; And voltage signal carried out filtering, sampling, produce sampled signal.The package of uploading when optical network unit surpasses the distribution time slots at interval, when the continuous multiple spot of sampled signal surpasses door, closes light transmission output light signal.
The present invention also provides a kind of power monitor method of optical network unit, and it may further comprise the steps: light transmission is provided, and light transmission is in order to upload the optowire equipment of light signal to passive optical network; Photodetector is provided,, and sends current signal in order to the monitoring optical signal transmitting; Current signal is converted to voltage signal; Voltage signal is carried out filtering, sampling, produce sampled signal; And the average sample voltage of signals, obtain the average output power of light transmission.
From the above, the photodetector of the sensed light signal of optical network unit of the present invention can produce current signal, after current signal is converted to voltage signal, voltage signal is carried out filtering, sampling, produce sampled signal, not only the time interval of the time slot that is assigned with at optical network unit (time slot) takes a sample, and also takes a sample at interval in other time slots.
The method for detecting abnormality of optical network unit of the present invention is that the package of uploading when optical network unit surpasses when distributing time slots at interval, when the continuous multiple spot of sampled signal surpasses door, closes light transmission.
The power monitor method of optical network unit of the present invention is after current signal that the photodetector with optical network unit sends is converted to voltage signal, carry out filtering, sampling, average at the sampling point that sampled signal is higher than door, can obtain the average output power of light signal at the optical network unit end.
Description of drawings
Fig. 1 is the schematic diagram of general passive optical network;
Fig. 2 is the calcspar of the optical network unit of preferred embodiment of the present invention;
The schematic diagram of the burst mode data that Fig. 3 uploads for optical network unit of the present invention;
Fig. 4 is the schematic diagram of the smooth voltage signal of optical network unit of the present invention;
Fig. 5 is the sampling schematic diagram of normal burst mode data of the present invention;
Fig. 6 is the sampling schematic diagram of the unusual burst mode data of the present invention;
Fig. 7 is the flow chart of the method for detecting abnormality of optical network unit of the present invention;
The schematic diagram of the method for the average output power that Fig. 8 calculates light transmission for the present invention is a kind of; And
Fig. 9 is the schematic diagram of the method for the average output power of the another kind of calculating of the present invention light transmission.
[main element label declaration]
1～4: time slot 10: passive optical network
11～14,20: optical network unit 15: splitter
16: optowire equipment 111,121,131,141: data packet
1～4: time slot 21: light emission submodule (TOSA)
211: light transmission 211 212: photodetector
23: signal measurement module 231: current-to-voltage convertor
232: low pass filter 233: analog-digital converter
25: controller 27: the light transmission driver element
S
C: current signal S
V: voltage signal
S
M: smooth voltage signal S
S: sampled signal
Embodiment
Hereinafter with reference to correlative type, a kind of optical network unit and abnormality detection and power monitor method according to preferred embodiment of the present invention are described.
Comprise a plurality of optical network units in passive optical network, each optical network unit is connected to optowire equipment (OLT) by behind optical fibre coupling one splitter.Optical network unit uses time division multiplexing (Time Division Multiplexing, TDM) mode is given this optowire equipment with data upload, when data upload, each optical network unit is only joined a time slot (time slot), and transmits data packet in distributed time slot.
Fig. 2 is the calcspar of the optical network unit of preferred embodiment of the present invention.This optical network unit 20 mainly comprises light emission submodule (TOSA) 21 and signal measurement module 23.Light emission submodule (TOSA) 21 mainly comprises light transmission 211 and photodetector 212.
The schematic diagram of the burst mode data that Fig. 3 uploads for optical network unit of the present invention.Light transmission 211 emission light signals are to the optic network equipment of passive optical network, optical network unit 20 is when uploading data, 211 of light transmissions are launched light signal in the time slot that is assigned with, light signal is burst mode (burst mode) data, 211 of light transmissions are opened (ON) in the time slot that is assigned with, close (OFF) in non-distributed time slot, wherein light transmission 211 is preferably laser diode (laser diode).Photodetector 212 and sends current signal S in order to the monitoring optical signal transmitting
C, photodetector 212 is preferably optical diode (photodiode).Signal measurement module 23 is connected with photodetector 212, with current signal S
CBe converted to voltage signal S
V, and to voltage signal S
VCarry out filtering, sampling, produce sampled signal S
S
Fig. 7 is the flow chart of the method for detecting abnormality of optical network unit of the present invention.This method for detecting abnormality may further comprise the steps.
Step S31: light transmission 211 is provided, and light transmission 211 is in order to upload the optowire equipment of light signal to passive optical network.
Step S32: photodetector 212 is provided,, and sends current signal S in order to the monitoring optical signal transmitting
C
Step S33: with current signal S
CBe converted to voltage signal S
V
Step S34: to voltage signal S
VCarry out filtering, sampling, produce sampled signal S
S
Be this voltage signal wherein by current-to-voltage convertor (current to voltage converter) switching current signal.(low-pass filler) carries out filtering to voltage signal by low pass filter, produces smooth voltage signal S
MBy analog-digital converter to smooth voltage signal S
MTake a sample, and produce sampled signal S
S
In unusual burst mode data, sampled signal S
SWhen multiple spot surpasses door continuously, close the light signal of light transmission 211.
The power monitor method step of optical network unit of the present invention also comprises step S31～S34, produces sampled signal S
SMethod also identical, with the method for detecting abnormality something in common no longer in addition for giving unnecessary details.
This power monitor method also comprises average sample signal S
SVoltage, to obtain the average output power of light transmission 211.
At average sample signal S
SThe step of voltage in, an average optical network element this sampled signal voltage in the time slot that is assigned with, and only on average be higher than the sampled signal S of lower voltage limit
S(as shown in Figure 8), or only on average be higher than lower voltage limit and be lower than the sampled signal S of upper voltage limit
S(as shown in Figure 9).
In sum, the photodetector of the sensed light signal of optical network unit of the present invention can produce current signal, after current signal is converted to voltage signal, voltage signal is carried out filtering, sampling, produce sampled signal, sampling mode is the asynchronous low speed sampling, cooperates the continuous sampling of asynchronous low speed frequency, not only the time slots that is assigned with at optical network unit is taken a sample at interval, also takes a sample at interval in other time slots.
The method for detecting abnormality of optical network unit of the present invention is that the package of uploading when optical network unit surpasses when distributing time slots at interval, when the continuous multiple spot of sampled signal surpasses door, closes light transmission.
The power monitor method of optical network unit of the present invention is after current signal that the photodetector with optical network unit sends is converted to voltage signal, carry out filtering, sampling, average at the sampling point that sampled signal is higher than door, can obtain the average output power of light signal at the optical network unit end.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the appended claim scope its equivalent modifications of carrying out or change.
Claims (22)
1. optical network unit, it comprises:
Light emission submodule, it comprises:
Light transmission, the emission light signal is to the optowire equipment of passive optical network; And
Photodetector in order to monitoring this optical signal transmitting, and sends current signal; And
Signal measurement module is connected with this photodetector, this current signal is converted to voltage signal, and this voltage signal is carried out filtering and sampling, produces sampled signal.
2. optical network unit according to claim 1, wherein this passive optical network comprises a plurality of these optical network units, respectively this optical network unit is connected to this optical network line facility by behind the optical fibre coupling splitter.
3. optical network unit according to claim 2, wherein this optical network unit uses the time division multiplexing mode to give this optowire equipment with data upload, when data upload, respectively this optical network unit is only joined a time slot, and in distributed time slot, transmit data packet, this optical network unit is when uploading data, and this light transmission is only launched light signal in the time slot that is assigned with.
4. optical network unit according to claim 1, wherein this light transmission is a laser diode, this photodetector is an optical diode.
5. optical network unit according to claim 1, wherein this light signal is the burst mode data, this light transmission of this optical network unit is only opened in the time slot that is assigned with, and closes in non-distributed time slot.
6. optical network unit according to claim 1, wherein this signal measurement module comprises:
Current-to-voltage convertor is connected with this photodetector, and this current signal is converted to this voltage signal;
Low pass filter is connected with this current-to-voltage convertor, and this voltage signal is carried out filtering, produces the smooth voltage signal; And
Analog-digital converter is connected with this low pass filter, and this smooth voltage signal is taken a sample, and produces this sampled signal.
7. according to each described optical network unit of claim 1 to 6, wherein this analog-digital converter is the asynchronous low speed sampling to the sampling mode of this smooth voltage signal, cooperate the asynchronous low speed frequency, the frequency of sampling is higher than the frequency of burst mode transfer of data, and be continuous sampling, take a sample at interval in the time slots that this optical network unit is assigned with, and take a sample at interval in other time slots.
8. optical network unit according to claim 7, it also comprises controller, be connected with this analog-digital converter, the package of uploading when optical network unit surpasses when distributing time slots at interval, when the continuous multiple spot of this sampled signal surpassed a door, this controller cut out this light transmission and exports this light signal.
9. optical network unit according to claim 8, wherein this controller promptly obtains the average output power of this light transmission on average at the voltage of this sampled signal that distributes the sampling point of time slots at interval.
10. optical network unit according to claim 9, it also comprises the light transmission driver element, is connected with light transmission, receives the control signal of burst mode data, drives this light transmission, this light transmission driver element is a laser diode drive.
11. the method for detecting abnormality of an optical network unit, it may further comprise the steps:
Light transmission is provided, and this light transmission is in order to upload the optowire equipment of light signal to passive optical network;
Photodetector is provided, in order to monitoring this optical signal transmitting, and sends current signal;
This current signal is converted to voltage signal;
This voltage signal is carried out filtering and sampling, produce sampled signal; And
When the continuous multiple spot of this sampled signal surpasses a door, close this light transmission.
12. the method for detecting abnormality of optical network unit according to claim 11, wherein this light signal is the burst mode data, and this light transmission of this optical network unit is only opened in the time slot that is assigned with, and closes in non-distributed time slot.
13. the method for detecting abnormality of optical network unit according to claim 11, wherein:
This current signal is to be converted to this voltage signal by current-to-voltage convertor;
The step of this voltage signal being carried out filtering is by low pass filter this voltage signal to be carried out filtering, produces the smooth voltage signal; And
The step that this voltage signal is taken a sample is by analog-digital converter this smooth voltage signal to be taken a sample, and produces this sampled signal.
14. method for detecting abnormality according to the optical network unit of claim 11 to 13 described in each, wherein the sampling mode to this voltage signal is the asynchronous low speed sampling, the frequency of sampling is higher than the frequency of burst mode transfer of data, and be continuous sampling, take a sample at interval in the time slots that this optical network unit is assigned with, and take a sample at interval in other time slots.
15. the method for detecting abnormality of optical network unit according to claim 14, wherein the package of uploading when this optical network unit surpasses when distributing time slots at interval, and the continuous multiple spot of this sampled signal surpasses this door, closes this light transmission.
16. the power monitor method of an optical network unit, it may further comprise the steps:
Light transmission is provided, and this light transmission is in order to upload the optowire equipment of light signal to passive optical network;
Photodetector is provided, in order to monitoring this optical signal transmitting, and sends current signal;
This current signal is converted to voltage signal;
This voltage signal is carried out filtering and sampling, produce sampled signal; And
The voltage of average this sampled signal obtains the average output power of this light transmission.
17. the power monitor method of optical network unit according to claim 16, wherein this light signal is the burst mode data, and this light transmission of this optical network unit is only opened in the time slot that is assigned with, and closes in non-distributed time slot.
18. the power monitor method of optical network unit according to claim 16, wherein:
This current signal is to be converted to this voltage signal by current-to-voltage convertor;
The step of this voltage signal being carried out filtering is by low pass filter this voltage signal to be carried out filtering, produces the smooth voltage signal; And
The step that this voltage signal is taken a sample is by analog-digital converter this smooth voltage signal to be taken a sample, and produces this sampled signal.
19. power monitor method according to the optical network unit of claim 16 to 18 described in each, wherein the sampling mode to this voltage signal is the asynchronous low speed sampling, the frequency of sampling is higher than the frequency of burst mode transfer of data, and be continuous sampling, take a sample at interval in the time slots that this optical network unit is assigned with, and take a sample at interval in other time slots.
20. the power monitor method of optical network unit according to claim 19, wherein in the step of the voltage of average this sampled signal, only average this optical network unit this sampled signal voltage in the time slot that is assigned with.
21. the power monitor method of optical network unit according to claim 20 wherein in the step of the voltage of average this sampled signal, only on average is higher than this sampled signal of lower voltage limit.
22. the power monitor method of optical network unit according to claim 20 wherein in the step of the voltage of average this sampled signal, only on average is higher than lower voltage limit and is lower than this sampled signal of upper voltage limit.
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| CN200910007782A CN101814948A (en) | 2009-02-24 | 2009-02-24 | Optical network unit and anomaly detection and power monitoring method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510305A (en) * | 2011-09-29 | 2012-06-20 | 华南理工大学 | Optical power real-time monitoring system based on convex optimization |
| CN102546013A (en) * | 2012-02-17 | 2012-07-04 | 华为技术有限公司 | Signal power detection method and equipment |
| WO2018218422A1 (en) * | 2017-05-27 | 2018-12-06 | 华为技术有限公司 | Method, device and system for detecting mean value of signal |
-
2009
- 2009-02-24 CN CN200910007782A patent/CN101814948A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510305A (en) * | 2011-09-29 | 2012-06-20 | 华南理工大学 | Optical power real-time monitoring system based on convex optimization |
| CN102510305B (en) * | 2011-09-29 | 2014-07-30 | 华南理工大学 | Optical power real-time monitoring system based on convex optimization |
| CN102546013A (en) * | 2012-02-17 | 2012-07-04 | 华为技术有限公司 | Signal power detection method and equipment |
| CN102546013B (en) * | 2012-02-17 | 2014-08-13 | 华为技术有限公司 | Signal power detection method and equipment |
| US9025953B2 (en) | 2012-02-17 | 2015-05-05 | Huawei Technologies Co., Ltd. | Method and device for detecting signal power |
| WO2018218422A1 (en) * | 2017-05-27 | 2018-12-06 | 华为技术有限公司 | Method, device and system for detecting mean value of signal |
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Application publication date: 20100825 |