CN101499853B - Optical path measuring method, optical network and network appliance - Google Patents
Optical path measuring method, optical network and network appliance Download PDFInfo
- Publication number
- CN101499853B CN101499853B CN 200810065262 CN200810065262A CN101499853B CN 101499853 B CN101499853 B CN 101499853B CN 200810065262 CN200810065262 CN 200810065262 CN 200810065262 A CN200810065262 A CN 200810065262A CN 101499853 B CN101499853 B CN 101499853B
- Authority
- CN
- China
- Prior art keywords
- light signal
- ont
- optical
- energy
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Optical Communication System (AREA)
- Small-Scale Networks (AREA)
Abstract
The embodiment of the invention provides a measuring method of optical path states, which adopts the following technical proposal: time synchronization between a sender and a receiver is implemented, and the sender determines an optical signal energy differential value between the sender and the receiver at a same time according to the optical signal energy and corresponding measuring time information that are reported by the receiver as well as the measured own optical signal energy and corresponding measuring time information. The embodiment of the invention can improve the optical loss computation accuracy of an optical distribution network, and provide accurate data that is required for determining optical network failures, thus realizing more accurate failure location and lowering the operation cost.
Description
Technical field
The invention belongs to optical communication field, relate in particular to a kind of method of measurement, optical-fiber network and network equipment of optical path states.
Background technology
At optical line terminal (Optical Line Termination; OLT) (Optical Distribution Network, optical attenuation ODN) must obtain transmitting optical power and ONT Optical Network Terminal (the Optical Network Termination of OLT to go up the on-line measurement Optical Distribution Network; ONT) or optical network unit (Optical Network Unit; ONU) received optical power, or the received optical power of the transmitting optical power of ONT/ONU and OLT, these two optical power losses that the power difference is ODN.Because EPON (Passive Optical Network, PON) uplink optical signal is a burst mode, the power ratio of measuring burst light is difficult, and downlink optical signal is the continuous light pattern, test light power difficulty is lower.Therefore usual way is the optical power loss of the received optical power calculating ODN of the luminous power of sending according to OLT and ONT.
For example: when OLT asks, or ONT initiatively according to circumstances reports continuously or ONT initiatively reports the received optical power of ONT when measurement variation; OLT measures transmitting optical power; OLT calculates both differences according to the luminous power of its transmission and received ONT luminous power information, can obtain the optical loss of ODN.
Another kind of mode be ONT according to circumstances continuously or report the transmitting optical power of ONT during measurement variation automatically; After OLT receives, measure the received optical power of OLT; OLT calculates both differences again according to the received optical power of the transmitting optical power of ONT and OLT, can obtain the optical loss of ODN.
Because in the PON system, exist up Dynamic Bandwidth Allocation (Dynamic broadband assignment, DBA) etc., the ONT reported data has time delay; Having under the abnormal conditions, optical-fiber network attenuation change speed is very fast, can cause that on OLT, to calculate the ODN optical loss inaccurate, influences the location of failure cause.
Summary of the invention
The embodiment of the invention provides a kind of method of measurement, optical-fiber network and network equipment of optical path states,
Wherein, this method comprises:
Transmitting terminal is measured the light signal energy of its transmission, the very first time information when record is measured;
Receiving terminal is measured it and is received the light signal energy and second temporal information when measuring;
Said transmitting terminal sends to receiving terminal with the light signal energy of its measurement very first time information when measuring;
Said receiving terminal is according to said light signal energy that self records and the second corresponding temporal information; And said transmitting terminal the light signal energy and the corresponding very first time information of sending, confirm when said very first time information is identical with second temporal information difference of light signal energy between the transmitting terminal and receiving terminal;
Perhaps
Said receiving terminal sends to transmitting terminal with the light signal energy of its measurement second temporal information when measuring;
Said transmitting terminal is according to said light signal energy that self records and corresponding very first time information; And the light signal energy that reports of said receiving terminal and the second corresponding temporal information, confirm when said very first time information is identical with second temporal information difference of light signal energy between the transmitting terminal and receiving terminal;
Said transmitting terminal is an optical line terminal OLT, and receiving terminal is ONT Optical Network Terminal ONT or optical network unit ONU; And/or said transmitting terminal is ONT Optical Network Terminal ONT or optical network unit ONU, and receiving terminal is an optical line terminal OLT.
The embodiment of the invention also provides a kind of network equipment, and this types of network equipment comprises optical line terminal OLT, comprising:
Lock in time, generator was used for generation time information;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured, and the temporal information when obtaining this measurement from lock in time the generator, and measurement result is sent to computing unit;
The light sending and receiving unit is used to send light signal and/or receiving optical signals;
Computing unit is used for the energy of the identical light signal of temporal information that comparison light sending and receiving unit and energy measurement unit provide, output result of calculation.
The embodiment of the invention also provides a kind of network equipment, and this types of network equipment comprises ONT Optical Network Terminal ONT or optical network unit ONU, comprises:
Synchrotimer is used for the time of ONT and the time synchronized of optical line terminal equipment, and sends this temporal information after synchronously;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured the temporal information that writing time, synchronizer sent simultaneously;
The light sending and receiving unit is used to send light signal and/or receiving optical signals;
Report generator is used for the output according to the energy measurement unit, and it is right to produce the light signal energy and the time information corresponding data that record, and the output result.
The embodiment of the invention also provides a kind of network equipment, and this types of network equipment comprises ONT Optical Network Terminal ONT or optical network unit ONU, comprises:
Synchrotimer is used for the time of ONT and the time synchronized of optical line terminal equipment, and extracts the temporal information in the light sending and receiving unit receiving optical signals;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured;
The light sending and receiving unit is used to send the light signal that light signal and/or reception report;
Report generator is used for the output according to energy measurement unit and synchrotimer, and it is right to produce the light signal energy and the time information corresponding data that record, and the output result.
The embodiment of the invention also provides a kind of EPON, comprises light distributing network ODN, and aforesaid optical line terminal OLT and optical network unit ONU or ONT Optical Network Terminal ONT.
Use the technical scheme of the embodiment of the invention, can improve the accuracy that the ODN optical loss is calculated, judging for optical network fault provides required accurate data, thereby can realize fault location more accurately, cuts operating costs.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention;
Fig. 2 is the method flow diagram of the embodiment of the invention;
Fig. 3 is the system block diagram of the embodiment of the invention;
Fig. 4 is an embodiment of the invention network equipment OLT structured flowchart;
Fig. 5 is an embodiment of the invention network equipment ONT/ONU structured flowchart.
Embodiment
Shown in accompanying drawing 1; System construction drawing for passive optical network PON; Optical line terminal OLT 101 and the ONT Optical Network Terminal ONT/ optical network unit ONU 105 (ONT that mention among the present invention; Except that specifying, all refer to ONT or ONU) in all comprise device (Transciever) RT/TX that can carry out the light transmitting-receiving; Light distributing network ODN103 comprises N: 1,1: optical splitter 107 and the optical fiber 109 of N or N: M; OLT and ONT carry out mutual communication through the optical fiber 109 of ODN103; Can be when light signal transmits in ODN103 because a variety of causes produces the strength retrogression; As fiber lengths difference, optical fiber overbending, optical fiber suffer oppression, the light joint is loosening, variation of ambient temperature, device aging etc.; These factors all can influence optical attenuation, and the optical power intensity that causes OLT101 arrival ONT105 and ONT105 to reach OLT101 changes.
Shown in accompanying drawing 2, the embodiment of the invention one provides a kind of method:
201:OLT time generator generation time information, and be delivered to ONT/ONU through the light distribution networks ODN in the PON network;
203:ONT/ONU carries out self time and OLT time synchronously according to the temporal information that its OLT that receives sends;
The energy of the light signal that the 205:ONT/ONU measurement receives (generally being measuring light power); Regularly maybe when detecting the light signal energy when unusual; Perhaps when OLT transmission request command requires to report the light signal energy, with the synthetic generation report of light signal energy that records and corresponding Measuring Time;
The report reporting that 207:ONT/ONU will produce is given OLT;
209:OLT measures and writes down the energy of the light signal that himself sends, and writes down this light signal and send time corresponding.OLT can periodic measurement and recording light signal energy and time.
This step also can be placed on after 203, carry out before 205, i.e. the measurement of OLT and record, with the measurement of ONU/ONT with report be can carry out simultaneously, order or carry out in proper order in no particular order with other.
After 2011:OLT receives the report that ONT reports; According to the light signal energy and the time of self record; And the light signal energy of the same time in the report that receives, calculate the difference that receives with the light signal energy that sends, i.e. the optical attenuation of light distributing network ODN in this optical-fiber network.
Concrete, action below in ONT, carrying out (ONT in the embodiment of the invention can be GPONONT, also can be EPON ONT, or other are based on the ONT of PON technology):
1, make the time of ONT and the time synchronized of OLT, and in ONT the generation time sequence;
2, ONT regularly or when receiving the OLT request, the receiving optical signals energy of measurement ONT itself is as measuring the luminous power PRX_ONT that ONT receives signal; And write down the temporal information when measuring, produce t, the PTX_OLT} data are right; Wherein t is a temporal information; In GPON, can adopt super frame counter or its low byte, a specific serial number of layout is like that in the frame that t also can carve for OLT at a time;
3, ONT is regularly or according to the request of OLT, maybe when detecting the light signal energy when unusual, will t, the PTX_OLT} data are to reporting OLT;
Corresponding, the processing procedure in OLT is:
1, the last generation time sequence of OLT (this OLT with the time synchronized of ONT); Regularly perhaps measure the energy of the transmission light signal of OLT as required, send the luminous power PTX_OLT of light signal, and write down time information corresponding like measurement; Obtain { t; The PTX_OLT} data are to (t is the time, in GPON, can adopt supeframe counting Super frame counter or low byte to transmit, a specific serial number of layout in the frame that also can carve at a time for OLT; Be to produce serial number or counting among the OLT with temporal information; Come express time t with regard to serial number or counting when gathering luminous power with current time, like that), measuring light power can use light power meter Power Meter or other prior aries;
2, OLT receives temporal power data that ONT reports to { t, PRX_ONT}, or OLT applies for that as required ONT reports the temporal power data to { t, PRX_ONT};
3, OLT calculates PTX_OLT and the PRX_ONT difference of identical t, is the light decay depreciation of light distributing network ODN under the identical t;
4, according to the light decay depreciation of this ODN or with the sequence variation of t; Contrast can obtain fault type and output with fault model; Wherein, Fault model is the corresponding relation of light decay depreciation or situation of change and different faults, all can change in time and a change procedure is arranged like the light decay depreciation that comes off at the light connector, optical fiber ODN in the process such as is broken by pressure rolling, optic fibre force, and every kind of variation can corresponding different faults.
Wherein,, can think that PTX_OLT does not change with t basically, can think OLT on that then PTX_OLT is a constant if OLT finds that the variation of transmitting optical power PTX_OLT value of himself is smaller, and the number of times of minimizing measurement PTX_OLT.
If to there being transmission delay to take into account between the ONT, promptly tONT lock in time on the ONT postpones t ' than OLT time tOLT with OLT, and this time delay taken into account carry out metrophia compensation, then can guarantee more accurately test data.Under the normal condition ONT report t, PRX_ONT} take this time delay into account ONT reports when carrying out metrophia compensation t+t '; PRX_ONT} is because postpone t ', when OLT tests with self and ONT reported data; Guarantee to adopt the data of synchronization, just can obtain more accurate data.
Time synchronization information includes but not limited to: in GPON, can adopt GPON supeframe counting super-framecounter or its part field or OLT to time synchronized data of ONT broadcasting etc.
The present invention also can implement from the rightabout of instance one: ONT is synchronized on the OLT, on ONT, measures transmitting optical power PTX_ONT, and on OLT, measure the luminous power PRX_OLT of the corresponding ONT that receives.
The up transmission of ONT t, the PTX_ONT} data are right; OLT is last measure the corresponding ONT receive luminous power PRX_OLT, generation t, the PRX_OLT} sequence is right, according to this { t; { the t of PRX_OLT} and reception; The PTX_ONT} sequence is calculated PRX_OLT and PTX_ONT difference under identical t, thereby obtains the constantly accurate ODN optical attenuation OLOND of t.
Also can implement the process that preamble is described simultaneously from both direction.
ONT and OLT synchronously after; OLT last with ONT on transmitting optical power of record own and time corresponding simultaneously, and send to the other side; OLT and ONT be recorder luminous power and time data simultaneously; OLT and ONT are after receiving the other side's data, and the sending and receiving luminous power of contrast synchronization then all can accurately calculate the ODN optical attenuation respectively on OLT and ONT.Can be through optical attenuation measurement result be repeatedly obtained measurement result more accurately through data processing (like average computation etc.).
Shown in accompanying drawing 3, the embodiment of the invention two provides a passive optical network PON system, and this system comprises: OLT, ODN and ONT/ONU, wherein,
ODN comprises optical splitter 107 and optical fiber 109;
OLT comprises with lower module:
1) lock in time generator: be used for synchronous OLT and the synchronisation source of ONT time, can be any clock source or counter.In GPON, can adopt supeframe counting Super frame counter, can be lock in time among the EPON, also can adopt other modes to produce, need more accurately needs precise time Synchronism Unit more more of measuring accuracy; Be used to produce the temporal information of OLT and export to TX, send to ONT/ONU.
2) energy measurement unit (being light power meter Power Meter among Fig. 3): be used for the light signal that sends or receive is carried out measuring light power, and measurement result is sent to comparator; Also be used for from generator acquisition time information lock in time the time when obtaining measuring light power;
3) light sending and receiving unit (being RX, TX among Fig. 3): linking to each other with the optical fiber of light distributing network ODN, be used for respectively receiving and sending light signal, is the interface that OLT communicates by letter with ONT;
4) computing unit (being comparator among Fig. 3): be used for the luminous power with same/identical time that sent reception that the energy measurement unit is provided is compared calculating and output result; Also be used for acquisition time information, report time of failure accurately; Acquisition time information etc. when the energy measurement unit does not provide temporal information.
ONT/ONU comprises with lower module:
1) synchrotimer: be used for ONT time and OLT synchronous; Temporal information in the light signal that can also the light sending and receiving unit is received extracts, and sends to report generator for the related information of report generator generation power with corresponding temporal information;
Synchrotimer has two kinds of implementations at least: 1) the complete time synchronized of ONT and OLT, and considered the transmission delay between OLT and the ONT; 2) another kind is a time synchronized of not considering transmission delay.
2) energy measurement unit (being light power meter Power Meter among Fig. 3): be used for the light signal that sends or receive is carried out measuring light power; Also can when measured power, write down the temporal information of sending here from synchrotimer simultaneously;
3) light sending and receiving unit (being RX, TX among Fig. 3): ODN links to each other with the light distributing network, is used to receive the light signal that sends from OLT, perhaps sends light signal and gives OLT; Wherein, RX exports to synchrotimer with the temporal information of carrying in the signal after receiving light signal;
4) report generator: the luminous power that is used for sending according to the energy measurement unit and the luminous power of this test of time information generating of synchrotimer transmission and time information data are to (like { t; PRX_ONT}); The output and the synchrotimer output that are about to the energy measurement unit are associated; And send to the light Transmit-Receive Unit, send to OLT by the light Transmit-Receive Unit; If the energy measurement unit writes down the time of sending here from synchrotimer when measured power simultaneously, the report generator luminous power and the time information data that only are used to produce this test is to (as { t PRX_ONT}), and sends so.
Certainly also can also include comparator on the ONT; OLT is last also can to include report generator, when ONT and OLT measure the ODN optical attenuation simultaneously, can obtain accurate more measurement result, but this method increases cost relatively, specifically describes referring to method, just repeats no more at this like this.
Shown in accompanying drawing 4, the embodiment of the invention three provides a network equipment, and this equipment is OLT, comprising:
1) lock in time generator: be used for synchronous OLT and the synchronisation source of ONT time, can be any clock source or counter.In GPON, can adopt Super frame counter, can be lock in time among the EPON, also can adopt other modes to produce, need more accurately needs precise time Synchronism Unit more more of measuring accuracy.
2) energy measurement unit (being Power Meter among Fig. 2): be used for the light signal that sends or receive is carried out measuring light power;
3) light sending and receiving unit (being RX, TX among Fig. 2): linking to each other with the optical fiber of light distributing network ODN, be used for respectively receiving and sending light signal, is the interface that OLT communicates by letter with ONT;
4) computing unit (among Fig. 2 for comparator): the luminous power with the synchronization that is sent of the reception that is used for light Transmit-Receive Unit and measuring light power unit are provided compares calculates and exports the result;
OLT is last can also to include report generator, and this report generator can be a standalone module, also can be placed in the computing unit, and the luminous power and the time data that are used to produce test are right, and send to the light Transmit-Receive Unit, send to ONT/ONU by the light Transmit-Receive Unit.Promptly also can measure the luminous power of the light signal that sends by ONT by OLT, and the luminous power that this records is sent to ONT/ONU, carry out the calculating of ODN optical loss by ONT/ONU.
Shown in accompanying drawing 5, the embodiment of the invention four provides a network equipment, and this equipment is ONT/ONU, comprising:
1) synchrotimer: be used for ONT and OLT time synchronized;
2) measuring light power unit (being Power Meter among Fig. 2): be used for the light signal that sends or receive is carried out measuring light power;
3) light sending and receiving unit (being RX, TX among Fig. 2): ODN links to each other with the light distributing network, is used to receive the light signal that sends from OLT, perhaps sends light signal and gives OLT;
4) report generator: the luminous power and the time data that are used to produce test are right, and send to the light Transmit-Receive Unit, send to OLT by the light Transmit-Receive Unit;
ONT is last can also also to include computing unit; This computing unit can be standalone module; Also can be placed in the report generator, the luminous power with the synchronization that is sent (when temporal information is identical) of the reception that is used for light Transmit-Receive Unit and measuring light power unit are provided compares to be calculated and the output result.Promptly can give OLT by ONT/ONU active illuminating signal, OLT sends to ONT/ONU with the luminous power of this light signal that it records, and like this, is carried out the calculating of ODN optical loss by ONT.
In sum, use the technical scheme of the embodiment of the invention, can improve the accuracy that the ODN optical loss is calculated, judging for optical network fault provides required accurate data, thereby can realize fault location more accurately, cuts operating costs.
More than method, optical-fiber network and the network equipment of a kind of measuring light power that the embodiment of the invention provided carried out detailed introduction; Used concrete example among this paper the principle and the execution mode of the embodiment of the invention are set forth, the explanation of above embodiment just is used for helping to understand the embodiment of the invention; For one of ordinary skill in the art, according to the principle of the embodiment of the invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (12)
1. the method for measurement of an optical path states is characterized in that, comprises step:
Transmitting terminal is measured the light signal energy of its transmission, the very first time information when record is measured;
Receiving terminal is measured it and is received the light signal energy and second temporal information when measuring;
Said transmitting terminal sends to receiving terminal with the light signal energy of its measurement very first time information when measuring; Said receiving terminal is according to said light signal energy that self records and the second corresponding temporal information; And said transmitting terminal the light signal energy and the corresponding very first time information of sending, confirm when said very first time information is identical with second temporal information difference of light signal energy between the transmitting terminal and receiving terminal; Perhaps
Said receiving terminal sends to transmitting terminal with the light signal energy of its measurement second temporal information when measuring; Said transmitting terminal is according to said light signal energy that self records and corresponding very first time information; And the light signal energy that reports of said receiving terminal and the second corresponding temporal information, confirm when said very first time information is identical with second temporal information difference of light signal energy between the transmitting terminal and receiving terminal;
Said transmitting terminal is an optical line terminal OLT, and receiving terminal is ONT Optical Network Terminal ONT or optical network unit ONU; And/or said transmitting terminal is ONT Optical Network Terminal ONT or optical network unit ONU, and receiving terminal is an optical line terminal OLT.
2. the method for claim 1 is characterized in that, also comprises:
With being time-synchronized on ONT Optical Network Terminal ONT or the optical network unit ONU of optical line terminal OLT.
3. the method for claim 1 is characterized in that, also comprises:
According under the said same time between transmitting terminal and the receiving terminal contrast of the difference of light signal energy and fault model obtain fault type and output.
4. the method for claim 1 is characterized in that:
Said transmitting terminal or receiving terminal use light power meter to measure the luminous power of said light signal.
5. network equipment, said types of network equipment comprises optical line terminal OLT, it is characterized in that, comprising:
Lock in time, generator was used for generation time information;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured, and the temporal information when obtaining this measurement from lock in time the generator, and measurement result is sent to computing unit;
The light sending and receiving unit is used to send light signal and/or receiving optical signals;
Computing unit is used for the energy of the identical light signal of temporal information that comparison light sending and receiving unit and energy measurement unit provide, output result of calculation.
6. the network equipment as claimed in claim 5 is characterized in that,
Said lock in time, generator was clock source or counter.
7. the network equipment as claimed in claim 5 is characterized in that, also comprises:
Report generator, be used for the energy measurement unit and lock in time generator output be associated, produce light signal energy and the time information corresponding sequence record, and export the result.
8. network equipment, said types of network equipment comprises ONT Optical Network Terminal ONT or optical network unit ONU, it is characterized in that, comprising:
Synchrotimer is used for the time of ONT and the time synchronized of optical line terminal equipment, and sends this temporal information after synchronously;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured the temporal information that writing time, synchronizer sent simultaneously;
The light sending and receiving unit is used to send light signal and/or receiving optical signals;
Report generator is used for the output according to the energy measurement unit, and it is right to produce the light signal energy and the time information corresponding data that record, and the output result.
9. the network equipment as claimed in claim 8 is characterized in that, also comprises:
Computing unit is used for the difference of comparison light sending and receiving unit and energy measurement unit luminous power of light signal when temporal information is identical, output result of calculation.
10. network equipment, said types of network equipment comprises ONT Optical Network Terminal ONT or optical network unit ONU, it is characterized in that, comprising:
Synchrotimer is used for the time of ONT and the time synchronized of optical line terminal equipment, and extracts the temporal information in the light sending and receiving unit receiving optical signals;
The energy measurement unit is used for the energy of the light signal that sends or receive is measured;
The light sending and receiving unit is used to send the light signal that light signal and/or reception report;
Report generator is used for the output according to energy measurement unit and synchrotimer, and it is right to produce the light signal energy and the time information corresponding data that record, and the output result.
11. the network equipment as claimed in claim 10 is characterized in that, comprising:
Computing unit; Be used for output according to measuring unit, synchrotimer and light sending and receiving unit; The luminous power of the light signal that comparison measuring unit when temporal information is identical is measured and the difference of the light signal luminous power that the light sending and receiving unit is received, and output result of calculation.
12. an EPON is characterized in that, comprising:
Each described OLT and claim 8 or 9 described ONU or ONT in the claim 5 to 7, and the light distributing network ODN that connects OLT and ONU/ONT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810065262 CN101499853B (en) | 2008-01-30 | 2008-01-30 | Optical path measuring method, optical network and network appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810065262 CN101499853B (en) | 2008-01-30 | 2008-01-30 | Optical path measuring method, optical network and network appliance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101499853A CN101499853A (en) | 2009-08-05 |
| CN101499853B true CN101499853B (en) | 2012-08-15 |
Family
ID=40946749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810065262 Active CN101499853B (en) | 2008-01-30 | 2008-01-30 | Optical path measuring method, optical network and network appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101499853B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103684585B (en) * | 2012-09-03 | 2016-01-27 | 华为技术有限公司 | The method, apparatus and system of measuring and protecting group switching time |
| CN109827665A (en) * | 2017-11-23 | 2019-05-31 | 中国信息通信研究院 | A kind of power optical fiber cable overheat method for early warning and device into family network |
| CN110324104B (en) * | 2018-03-28 | 2021-06-22 | 华为技术有限公司 | Time synchronization method in PON system, OLT, ONU and PON system |
| CN112771796B (en) * | 2018-09-29 | 2022-05-10 | 华为技术有限公司 | Method and device for distributing uplink luminous time slots of optical network equipment |
| CN115065857B (en) * | 2022-08-17 | 2022-11-25 | 深圳市品为科技有限公司 | High-definition multimedia interface optical fiber transmission device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592184A (en) * | 2003-08-27 | 2005-03-09 | 三星电子株式会社 | Apparatus and method for tracking optical wavelength in WDM passive optical network |
| CN1815994A (en) * | 2005-02-02 | 2006-08-09 | 华为技术有限公司 | Method for detecting exchange failure of intelligent optical network dual-direction multi-plexing section loop network protection |
-
2008
- 2008-01-30 CN CN 200810065262 patent/CN101499853B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592184A (en) * | 2003-08-27 | 2005-03-09 | 三星电子株式会社 | Apparatus and method for tracking optical wavelength in WDM passive optical network |
| CN1815994A (en) * | 2005-02-02 | 2006-08-09 | 华为技术有限公司 | Method for detecting exchange failure of intelligent optical network dual-direction multi-plexing section loop network protection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101499853A (en) | 2009-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2034635B1 (en) | A method for locating fiber event point and an optical network and network equipment thereof | |
| CN101790111B (en) | Method and device and system for detecting light distributed network | |
| KR100663462B1 (en) | Optical passive network | |
| US7428382B2 (en) | System and method for performing in-service fiber optic network certification | |
| CN101291176B (en) | Fault detection method, system and apparatus for optical distributed network | |
| CN102511134B (en) | Optical fiber identification method, optical line terminal and identification system thereof | |
| US8050556B2 (en) | In-band optical frequency division reflectometry | |
| CN102055523A (en) | Method, equipment and system for diagnosing failure of passive optical network | |
| US20090016714A1 (en) | System and method for performing in-service fiber optic network certification | |
| US8913887B2 (en) | Passive optical fiber plant analysis | |
| US7894362B2 (en) | Passive optical network topology estimation | |
| EP2518951A1 (en) | Method, equipment and system for time synchronization of passive optical network | |
| CN101499853B (en) | Optical path measuring method, optical network and network appliance | |
| EP2141832B1 (en) | Automatic topology discovery for passive optical networks | |
| CN102821330B (en) | WDM-PON (wavelength division multiplexing-passive optical network) for performing OTDR (optical time domain reflectometry) test without influencing service | |
| CN101232328A (en) | Method for locating case point of branch optical fiber, optical network and network appliance | |
| CN102412902A (en) | Optical network unit photoelectric device with optical time domain reflection function | |
| CN103620985A (en) | Pon supervisoion using otdr measurements | |
| CN102388549B (en) | Method, system and device for detecting optical fiber link in passive optical network | |
| CN103326775A (en) | On-line detection method and device for optical network failures | |
| CN105959058B (en) | A kind of device and method of quick detection TDM optical network link failure | |
| WO2013046047A1 (en) | Techniques for generating low rate data patterns compliant with passive optical networks | |
| CN105610535B (en) | The two-way time synchronous method and system of EPON access service | |
| CN101505439B (en) | Method for coordinating measurements and calibrations in a passive optical network | |
| JP2012029176A (en) | Hinderance onu specification device, hinderance onu specification method and pon system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |