CN103297123A - Method and system for monitoring light splitter - Google Patents
Method and system for monitoring light splitter Download PDFInfo
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- CN103297123A CN103297123A CN 201310255166 CN201310255166A CN103297123A CN 103297123 A CN103297123 A CN 103297123A CN 201310255166 CN201310255166 CN 201310255166 CN 201310255166 A CN201310255166 A CN 201310255166A CN 103297123 A CN103297123 A CN 103297123A
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Abstract
The invention discloses a method and a system for monitoring a light splitter and relates to discontinuous light detection and single-fiber single-wavelength bidirectional communication technologies in light communication. Under the condition that light path losses are basically not increased, the light power of all light fibers connected with the light splitters can be detected in real time, fault points are distinguished automatically, a key fault light path is cut off, and light path monitoring information is reported to field maintenance personnel and authorities in real time through wired and wireless communication links, so that convenience is brought for light network maintenance. According to the method, an ordinary light splitter, a small-scale light extraction apparatus connected with subsidiary light paths, a discontinuous burst mode light signal power detection circuit, a multi-path light power acquisition storage, fault positioning and fault light path cut-off circuit, a single-fiber single-wavelength bidirectional communication circuit special for monitoring, a wired and wireless communication circuit for maintenance and the like are included. The system comprises user light path information databases, management software, local unified network management software, a database and the like, wherein the user light path information databases are distributed and stored in intelligent-monitoring light splitter, and the management software is mounted on a field maintenance personnel mobile terminal.
Description
Technical field
The present invention relates to optical communication technique, particularly discontinuous light detects and single fiber list wavelength two-way communication technology in the optical communication.
Background technology
At present, there is this point-to-multipoint star topology of PON optical-fiber network in a large number in market, and it is made up of several like this parts: local side apparatus OLT, finish convergence and the professional up-downgoing management of multiplex terminal equipment; Terminal use's optical network unit ONU or ONT finish various customer services to the access of PON network; Optical distributed network comprises the optical fiber and the optical branching device that connect local side apparatus and end user device.Optical branching device is key node wherein, and the splitting ratio of optical branching device generally is 1:8,1:32, even reach 1:128.The effect of optical branching device is that a plurality of terminal use's optical fiber of the second line of a couplet are converged on the first line of a couplet optical fiber.
When some optical network units of the optical branching device second line of a couplet in the star-like topological structure networking or Optical Network Terminal were out of order, local side was only known certain subscriber equipment fault of which optical branching device second line of a couplet, but can't distinguish concrete which subscriber equipment fault.Common treatment measures are, the attendant checks to the scene at once from door to door, find out it is which user's family optical network unit or Optical Network Terminal break down and change it again.This has increased the maintenance cost of fault handling time drawn game side greatly, all causes very big inconvenience for telecom operators and terminal use.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of method and system thereof of optical branching device monitoring are provided, substantially do not increasing under the condition of optical path loss, can detect the luminous power of all optical fiber of optical branching device connection in real time, automatically carry out the fault point differentiation and cut off the critical failure light path, give on-site maintenance personnel drawn game side light path monitor message real-time report by wired and wireless communication link, safeguard to optical-fiber network to offer convenience.
The technical scheme that the present invention solve the technical problem employing is that the method and the system thereof that provide a kind of optical branching device to monitor be not provided under the condition of optical path loss substantially.The method of optical branching device monitoring comprises normal optical splitter, the minor proportions device for extracting light spare that connects second line of a couplet light path, discontinuous outburst mode optical signal power testing circuit, multichannel luminous power collection storage, fault location and fault light path and cuts off circuit, the special-purpose single fiber list wavelength two-way communication circuit of monitoring, safeguards the wired and wireless communication line of purposes etc.The system of optical branching device monitoring comprise distributed store at user's light path information database of intelligent monitoring optical branching device, be installed in management software, local side united net management software and database etc. on the on-site maintenance personnel portable terminal.
Being described as follows of 6 part major functions in the method for optical branching device monitoring and the system thereof:
1. the part that connects the minor proportions device for extracting light spare of second line of a couplet light path comprises: minor proportions light-splitting device, photo-detector diode.
2. the part of discontinuous outburst mode optical signal power testing circuit and job step comprise: discontinuous light signal irradiation photo-detector diode produces discontinuous photoelectric current; Discontinuous photoelectric current current flowing resistance produces pulse voltage; Pulse voltage extracts the pulse voltage max through series diode after the operational amplifier; Voltage max is amplified through variable-gain amplification circuit, sampling and analog to digital conversion circuit conversion, and the luminous power data are delivered to the multichannel luminous power and are gathered memory cell; Need metal-oxide-semiconductor to the discharge of the signal ground before variable-gain amplification circuit zero clearing after each analog-to-digital conversion is finished, prepare next luminous power sampling.
3. multichannel luminous power collection storage, fault location and fault light path are cut off network component and are comprised: the data reception of multichannel luminous power and memory cell, the comparative analysis of multichannel luminous power and fault light path positioning unit, indicator light and Alarm Unit, optical switch.
4. monitoring special-purpose single fiber list wavelength two-way communication circuit comprises: insert the point of the WDM of monitoring wavelength dedicated 1625nm or 1350nm light signal, the laser of monitoring wavelength dedicated 1625nm or 1350nm and control circuit, monitor optical signal receiving circuit, a wavelength of transmit-receive sharing to multiple spot two-way communication processing unit.The monitoring wavelength dedicated can be selected the wavelength different with up-downgoing transfer of data wavelength for use, is not limited to 1625nm or 1350nm.A plurality of subordinates intelligence optical branching device of higher level's intelligence optical branching device and the second line of a couplet is formed point to the Time Synchronization Network of multiple spot by the monitoring wavelength dedicated, the new subordinate's intelligence optical branching device that connects can be registered on higher level's intelligence optical splitter, higher level equipment is the luminous time slot that the subordinate equipment that succeeds in registration distributes, higher level's intelligence optical splitter distributes different timeslices to this equipment control command with the subordinate equipment reported data, timesharing sends light signal in the monitoring wavelength dedicated, has realized the two-way communication of single fiber list wavelength.
5. the wired and wireless communication line of safeguarding purposes comprises: the USB that is connected with portable terminal, serial ports, bluetooth, WiFi or other wired, wireless communication interfaces.
6. the system of optical branching device monitoring comprises: distributed store at user's light path information database of intelligent monitoring optical branching device, be installed in management software, local side united net management software and database on on-site maintenance personnel portable terminal mobile phone or the flat board.
The invention has the beneficial effects as follows, substantially do not increasing under the condition of optical path loss, by detecting and fault location function in the peripheral light path that increases of normal optical splitter, in optical fiber, increase monitoring wavelength dedicated transmitted in both directions monitor message, make up distributed user light path information database, monitor message can be wireless or wire transmission to on-site maintenance personnel portable terminal, simplified the scheme of monitoring optical fiber in the PON optical-fiber network, reduced the complexity that optical-fiber network is safeguarded; Reduced the cost of monitoring optical fiber during optical-fiber network is safeguarded.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the method for specific embodiments of the invention optical branching device monitoring and the schematic diagram of system thereof.
Fig. 2 is the main circuit schematic diagram that specific embodiments of the invention are monitored the two-way communication of special-purpose single fiber list wavelength.
Embodiment
Method and the system thereof of optical branching device monitoring are referring to Fig. 1.
The method of optical branching device monitoring comprises with the lower part: normal optical splitter 2, the minor proportions device for extracting light spare that connects second line of a couplet light path, discontinuous outburst mode optical signal power testing circuit, multichannel luminous power collection storage, fault location and fault light path are cut off circuit, the special-purpose single fiber list wavelength two-way communication circuit of monitoring, are safeguarded the wired and wireless communication line of purposes etc.Below each several part is done detailed explanation.The optical branching device 1 of band monitoring function is called intelligent optical branching device again in following document.
1. the part that connects the minor proportions device for extracting light spare of light path comprises: minor proportions light-splitting device 4, photo-detector diode 6.
2. the part of discontinuous outburst mode optical signal power testing circuit and job step comprise: a plurality of optical fiber of the optical branching device second line of a couplet are that the branch time slot staggers and sends light signal, so each light path sends is discontinuous light.Minor proportions light-splitting device 4 is told the discontinuous light signal of 1% minor proportions from second line of a couplet light path, discontinuous light signal irradiation photo-detector diode 6 produces discontinuous photoelectric current; Discontinuous photoelectric current flows through resistance R and produces pulse voltage Vr; Pulse voltage Vr is through after the operational amplifier 7, and series diode 8 extracts the pulse voltage max, this voltage max be exactly light path just in the luminous power of luminous period, avoided the influence of not luminous period optical power down; Voltage max is amplified through variable-gain amplification circuit 10, converts the luminous power data to by sampling and analog to digital conversion circuit 11, and the luminous power data are delivered to the multichannel luminous power and gathered memory cell 12; Need to control 9 pairs of variable-gain amplification circuits of metal-oxide-semiconductor 10 signal ground discharge before after each analog-to-digital conversion is finished, make the voltage zero clearing, for next luminous power sampling is prepared.
The a plurality of light paths of the general second line of a couplet of optical branching device, each light path need minor proportions device for extracting light spare and discontinuous outburst mode optical signal power testing circuit, and small light to the luminous power change-over circuit 3 of getting needs a cover in each light path.
3. multichannel luminous power collection storage and fault location network component comprise: the reception of multichannel luminous power data and memory cell 12, the comparative analysis of multichannel luminous power and fault light path positioning unit 19, indicator light and Alarm Unit, optical switch 5.Below explanation respectively.
Multichannel luminous power data receive and memory cell 12 receptions multichannel is small gets the luminous power data that light to luminous power change-over circuit 3 is sent here, and these data are stored among the local memory cell flash.According to each road luminous power data of new collection and the contrast of historical data value, too high or too low thresholding relatively, it is too high or too low to determine which light path luminous power, carries out indicator light colors or blink states alarm by indicator light and Alarm Unit.
If have only one the tunnel in a plurality of light paths just luminous, other light paths all become not luminance by luminance this moment, can judge that then because undesired continuous luminous other light paths that cause of this light path can't be luminous, the fault location circuit will send to optical switch 5 and disconnect optical path signals.
Optical switch 5 is received the disconnection optical path signal, optical switch is switched to the disconnection optical path states at once.After the open failure light path, other affected second line of a couplet light paths can be recovered normal luminous operating state again.
The corresponding relation of user's address, number and user terminal light device type information and light path also is stored among the local memory cell flash, after the portable terminal that maintains easily personnel connect to be gone up intelligent optical branching device, and fault location reason and station address fast.
4. monitor special-purpose single fiber list wavelength two-way communication circuit
The part of monitoring special-purpose single fiber list wavelength two-way communication circuit comprises: the monitoring wavelength dedicated is inserted the WDM 13 of first line of a couplet optical fiber, the monitoring wavelength dedicated is inserted the WDM 14 of second line of a couplet optical fiber, 1:2 optical splitter 15, optical receiver 16, laser 17, single fiber list wavelength two-way communication control circuit 18.Below explanation respectively.
The WDM 13 that the monitoring wavelength dedicated is inserted first line of a couplet optical fiber can be inserted into the optical channel of supervisory wavelength in the first line of a couplet optical fiber, and supervisory wavelength can be chosen the wavelength different with the frequently-used data transmission wavelength.The present invention chooses 1350nm as the intelligent optical branching device supervisory wavelength in the user building, chooses 1625nm as the supervisory wavelength of user building and local side telecommunication.
Monitor special-purpose single fiber list wavelength two-way communication control circuit 18 and comprise management higher level intelligence optical branching device and management subordinate intelligence optical branching device two cover monitoring management circuit.Because when certain intelligent optical branching device was connected with the second line of a couplet light mouth of higher level's intelligence optical branching device, it was as subordinate's intelligence optical branching device; When its second line of a couplet light mouth and subordinate intelligence optical branching device was connected, it was again as higher level's intelligence optical branching device, so it need manage higher level's intelligence optical branching device and management subordinate intelligence optical branching device two overlaps the monitoring management circuit.
The job step of management subordinate intelligence optical branching device supervisory circuit is to receive the control command that higher level's intelligence optical branching device issues through WDM 13,1:2 optical splitter 15 and optical receiver 16.Sending time slots in the distribution of higher level's intelligence optical branching device, multichannel luminous power data and the user's light path information that multichannel luminous power data receive and memory cell 12 is sent here, by control circuit 18 and laser 17, through 1:2 optical splitter 15 and WDM 13, send to higher level's intelligence optical branching device.
The job step of management higher level intelligence optical branching device supervisory circuit is by laser 17, through 1:2 optical splitter 15 and WDM 14, to send for a plurality of subordinates intelligence optical branching device and distribute luminous time slot order.Receive luminous power data and the user's light path information that a plurality of subordinates intelligence optical branching device sends through WDM 14,1:2 optical splitter 15 and optical receiver 16.
Monitor special-purpose single fiber list wavelength two-way communication control circuit, referring to Fig. 2.
In order to realize monitoring the two-way communication of special-purpose single fiber list wavelength, the present invention distributes different timeslices to control command with reported data, and timesharing sends light signal, has realized the two-way communication of single fiber list wavelength.Higher level's intelligence optical branching device sends control command and takies time slot TSm, and subordinate's intelligence optical branching device reported data and user profile take time slot TSn, and a plurality of subordinates intelligence optical branching device that has succeeded in registration takies different TSn(TS1, TS2 ... TSn).The subordinate's intelligence optical branching device that increases newly sends log-on message to the higher level and takies discovery timeslot TS0.Working mechanism is as follows:
In the present invention, 8 milliseconds is a time slot, and one-period is divided into 132 time slots for 1056 milliseconds.TSm accounts for two time slots, and the 3rd time slot is TS0, and 128 time slots afterwards are TSn time slots, last the time slot reservation.
In two time slots of TSm, first time slot is the control command that requirement subordinate splitter sends data type, and second time slot is the optical branching device registration of the newly-increased subordinate of management and is that the subordinate equipment of having registered distributes sending time slots.When the subordinate's intelligence optical branching device that increases newly is connected to the light mouth of higher level's intelligence optical branching device second line of a couplet, receive that higher level's intelligence optical branching device is behind the new optical branching device log-in command of permission that second time slot of TSM sends, the sequence number that sends this splitter at the TS0 time slot gets on, if second time slot of next cycle TSM receives that higher level's optical branching device is this splitter series number distributed time slot sheet TSn, later on all when each TSn feeler send data; If second time slot of next cycle TSM do not received higher level's optical branching device distributed time slot sheet, then random wait N cycle sends this equipment chain number, feeler when request distributes at TS0 again; The reason of not receiving feeler when higher level's optical branching device distributes might be that other optical branching devices are applied at the same time, produces conflict, and N all after date of general random wait applied for and can be succeeded in registration.
First time slot is that requirement subordinate splitter sends data type in two time slots of TSm, data type mainly is two classes, luminous power and fault warning are the first kind, station address, user terminal light device type and light path correspondence relationship information are second classes, can also expand other data types later on.Subordinate equipment succeeds in registration at higher level equipment, and after the feeler, the type of each cycle according to first time slot of TSm requires to send the corresponding types data at the time feeler of oneself when taking.
Higher level intelligence optical branching device is formed the Time Synchronization Network that point arrives multiple spot with a plurality of subordinates intelligence optical branching device of the second line of a couplet.Higher level intelligence optical branching device is that the sending time slots TSn that subordinate's intelligence light of new registration success distributes along separate routes is in fact, specifies subordinate equipment m the system clock clk cycle of delaying time after time slot TSM to send data again, and TSn is with regard to corresponding m.Higher level intelligence optical branching device is worked under the identical system clock of nominal frequency respectively with the subordinate optical branching device, owing to always have small frequency difference between the system clock of the local system clock of subordinate's optical branching device and higher level's intelligence optical branching device, subordinate's optical branching device send out data the moment may with the expectation of higher level intelligence optical branching device the time be carved with the difference of n system clock cycle, the intelligent optical branching device of higher level will compensate to this difference n among the m.If the current transmitting time of subordinate equipment has shifted to an earlier date n clock cycle than estimating, then this subordinate equipment time slot of sub-distribution changes m+n under the higher level equipment; If the current transmitting time of subordinate equipment has fallen behind n clock cycle, then this subordinate equipment time slot of sub-distribution changes m-n under the higher level equipment; Subordinate's optical branching device is sent out the assigned timeslot that moment on the data is exactly the expectation of higher level equipment again like this.In order to guarantee the synchronous effect of all subordinate equipments, higher level equipment need circulate and send the system time number of cycles of each subordinate equipment distribution T Sn time slot correspondence, and the distribution time slot before certain subordinate continued to use before not receiving the new distribution time slot of higher level equipment sends data.
The data that higher level equipment and subordinate equipment send all have 32 ' 0 ' and ' 1 ' lead code that alternately changes, and make things convenient for the light-receiving side to do the data clock recovery.The beginning of each sending time slots and end position are reserved at least not luminous zone of 32bit, avoid the luminous interference of adjacent time-slots.
5. the wired and wireless communication line of safeguarding purposes comprises: the USB that is connected with portable terminal, serial ports, bluetooth, WiFi or other wireless communication interfaces.Below each several part is done detailed explanation.
Safeguard that the wired of purposes and wireless communication line part comprise wired communications interface unit 20, wireless communication interface unit 21.Multichannel luminous power data receive and to link to each other with outside portable terminal 22 with USB interface with the serial ports UART of memory cell 12 by wired communication interface unit 20, also can convert wireline interface 20 to wireless blue tooth or the WiFi interface is set up communication link with portable terminal 22 again by wireless communication interface unit 21.
6. the system of optical branching device monitoring comprises: distributed store at user's light path information database of intelligent monitoring optical branching device, be installed in management software, local side united net management software and database on the on-site maintenance personnel portable terminal (mobile phone, flat board etc.).Below each several part is done detailed explanation.
Behind the wired communication interface unit 20 or 21 successful connections of wireless communication interface unit of on-site maintenance personnel portable terminal 22 and intelligent monitoring optical branching device, by the application A PP software based on intelligent mobile terminal operating system of special exploitation, the attendant by APP software graphic interface can the relation information of station address, user terminal light device type and respective optical path store into intelligent optical branching device memory cell; Also can read the information such as luminous power, fault warning, failed subs criber address of each user's light path.The personnel of maintaining easily open user, monitoring light path, fault location fast.Intelligence light monitoring splitter can be by special-purpose supervisory wavelength transmitted in both directions pilot signal, in real time information such as above user's light path information, each light path power and fault are reported to CMTS, deposit the local side database in, local side can carry out telemanagement by united net management software.
It should be noted last that: above execution mode is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-mentioned execution mode the present invention has been done detailed description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. method and the system thereof of optical branching device monitoring, it is characterized in that, substantially do not increasing under the condition of optical path loss, the method for optical branching device monitoring comprises normal optical splitter, the minor proportions device for extracting light spare that connects second line of a couplet light path, discontinuous outburst mode optical signal power testing circuit, multichannel luminous power collection storage, fault location and fault light path and cuts off circuit, the special-purpose single fiber list wavelength two-way communication circuit of monitoring, safeguards the wired and wireless communication line of purposes etc.; The system of optical branching device monitoring comprise distributed store at user's light path information database of intelligent monitoring optical branching device, be installed in management software, local side united net management software and database etc. on the on-site maintenance personnel portable terminal.
2. the method for optical branching device monitoring as claimed in claim 1 is characterized in that, the part that connects the minor proportions device for extracting light spare of second line of a couplet light path comprises: minor proportions light-splitting device, photo-detector diode.
3. the method for optical branching device as claimed in claim 1 monitoring, it is characterized in that part and the job step of discontinuous outburst mode optical signal power testing circuit comprise: discontinuous light signal irradiation photo-detector diode produces discontinuous photoelectric current; Discontinuous photoelectric current current flowing resistance produces pulse voltage; Pulse voltage extracts the pulse voltage max through series diode after the operational amplifier; Voltage max is amplified through variable-gain amplification circuit, sampling and analog to digital conversion circuit conversion, and the luminous power data are delivered to the multichannel luminous power and are gathered memory cell; Need metal-oxide-semiconductor to the discharge of the signal ground before variable-gain amplification circuit zero clearing after each analog-to-digital conversion is finished, prepare next luminous power sampling.
4. the method for optical branching device as claimed in claim 1 monitoring, it is characterized in that multichannel luminous power collection storage, fault location and fault light path are cut off network component and comprised: the data reception of multichannel luminous power and memory cell, the comparative analysis of multichannel luminous power and fault light path positioning unit, indicator light and Alarm Unit, optical switch.
5. the method for optical branching device as claimed in claim 1 monitoring, it is characterized in that, monitor special-purpose single fiber list wavelength two-way communication circuit and comprise: insert the point of the WDM of monitoring wavelength dedicated 1625nm or 1350nm light signal, the laser of monitoring wavelength dedicated 1625nm or 1350nm and control circuit, monitor optical signal receiving circuit, a wavelength of transmit-receive sharing to multiple spot two-way communication processing unit; The monitoring wavelength dedicated can be selected the wavelength different with up-downgoing transfer of data wavelength for use, is not limited to 1625nm or 1350nm; A plurality of subordinates intelligence optical branching device of higher level's intelligence optical branching device and the second line of a couplet is formed point to the Time Synchronization Network of multiple spot by the monitoring wavelength dedicated, the new subordinate's intelligence optical branching device that connects can be registered on higher level's intelligence optical splitter, higher level equipment is the luminous time slot that the subordinate equipment that succeeds in registration distributes, higher level's intelligence optical splitter distributes different timeslices to this equipment control command with the subordinate equipment reported data, timesharing sends light signal in the monitoring wavelength dedicated, has realized the two-way communication of single fiber list wavelength.
6. the method for optical branching device monitoring as claimed in claim 1 is characterized in that, safeguards that the wired and wireless communication line of purposes comprises: the USB that is connected with portable terminal, serial ports, bluetooth, WiFi or other wired, wireless communication interfaces.
7. the method for optical branching device as claimed in claim 1 monitoring, it is characterized in that the system of optical branching device monitoring comprises: distributed store at user's light path information database of intelligent monitoring optical branching device, be installed in management software, local side united net management software and database on on-site maintenance personnel portable terminal mobile phone or the flat board.
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| CN 201310255166 CN103297123A (en) | 2013-06-25 | 2013-06-25 | Method and system for monitoring light splitter |
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| CN 201310255166 CN103297123A (en) | 2013-06-25 | 2013-06-25 | Method and system for monitoring light splitter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038274A (en) * | 2014-06-03 | 2014-09-10 | 博创科技股份有限公司 | Optical fiber detection and maintenance management system |
| CN105450297A (en) * | 2015-12-30 | 2016-03-30 | 桂林创研科技有限公司 | Intelligent optical power collection system |
| CN106205109A (en) * | 2016-06-24 | 2016-12-07 | 桂林创研科技有限公司 | A kind of for monitoring fibre system at a high speed |
| CN112583481A (en) * | 2020-12-30 | 2021-03-30 | 王健 | Optical cable fiber core optical signal acquisition device, resource detection equipment and platform |
| CN115021805A (en) * | 2022-05-30 | 2022-09-06 | 成都涿光科技有限公司 | Information sampling analysis method, optical splitter, fused fiber disc, local side sampling equipment and platform |
-
2013
- 2013-06-25 CN CN 201310255166 patent/CN103297123A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038274A (en) * | 2014-06-03 | 2014-09-10 | 博创科技股份有限公司 | Optical fiber detection and maintenance management system |
| CN105450297A (en) * | 2015-12-30 | 2016-03-30 | 桂林创研科技有限公司 | Intelligent optical power collection system |
| CN106205109A (en) * | 2016-06-24 | 2016-12-07 | 桂林创研科技有限公司 | A kind of for monitoring fibre system at a high speed |
| CN112583481A (en) * | 2020-12-30 | 2021-03-30 | 王健 | Optical cable fiber core optical signal acquisition device, resource detection equipment and platform |
| CN115021805A (en) * | 2022-05-30 | 2022-09-06 | 成都涿光科技有限公司 | Information sampling analysis method, optical splitter, fused fiber disc, local side sampling equipment and platform |
| CN115021805B (en) * | 2022-05-30 | 2024-02-09 | 成都涿光科技有限公司 | Information sampling analysis method, optical splitter, fiber melting disc, local side sampling equipment and platform |
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Application publication date: 20130911 |