CN104980227B - The many detection node optical fiber energy supply methods of underground utilities and device based on CWDM - Google Patents
The many detection node optical fiber energy supply methods of underground utilities and device based on CWDM Download PDFInfo
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- CN104980227B CN104980227B CN201510214533.4A CN201510214533A CN104980227B CN 104980227 B CN104980227 B CN 104980227B CN 201510214533 A CN201510214533 A CN 201510214533A CN 104980227 B CN104980227 B CN 104980227B
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Abstract
The present invention relates to the photovoltaic energy conversion field of CWDM communication networks, spy is related to underground utilities detection node optical fiber energy supply method and device based on CWDM.By multiple signals optical fiber, to underground utilities, multiple detection nodes carry out energy supply to realize signal detection and data acquisition to the present invention everywhere with corresponding multichannel energy supply optical fiber, enable multiple detection nodes when work is needed simultaneously in energised state, just power cutoff after the completion of energy supply.The present invention can well solve the problems, such as that the energy supply of underground utilities detection node is difficult, improve the reliability of system operation, and be easy to safeguard.
Description
Technical field
The present invention relates to the photovoltaic energy conversion field of CWDM communication networks, spy is related to the underground utilities based on CWDM to detect
Node optical fiber energy supply method and device.
Background technology
1st, photovoltaic energy conversion
Photovoltaic energy conversion technology has been applied to GaAs (GaAs) conversion equipment of 3V and 5V, this technology ratio at present
Be more suited to the transmission of electricity of traditional energy supply application medium and long distance copper cash or live battery-powered easily influenceed by complex environment and can not
Stablize lasting situation, and then live energy supply is realized by the photovoltaic energy conversion that can flexibly control.
In transmitting terminal, electric energy is changed into laser using semiconductor laser diode and is transmitted in a fiber, in receiving terminal, used
Solar cell is used as receiving device.This device GaAs of 300 millimeters thicks is covered with 20 millis above as insulating substrate
The thick solar cell of rice, can be classified as several independent regions, and these independent regions are entered by gold-plated air bridges
Row series connection.When the laser transmitted by optical fiber is irradiated to solar cell, luminous energy may translate into electric energy, each isolated area
Up to 1 volt, 3~5 region series get up just to have 3~5 volts of voltages to the voltage of generation, can meet the inspection of most sensors
Slowdown monitoring circuit is used, such as need more high working voltage can series connection cumulative to multiple regions, such as need the more high workload electric current can also be to many
The cumulative parallel connection in individual region.
2nd, CWDM
In Metropolitan Area Network (MAN) or therewith in suitable communication range, because transmission range is not very very long, transmission range is generally in
Tens kilometers of scope, the decay of signal is in permissible range in optical fiber, therefore need not use fiber amplifier, increase by,
Two costs of optical fiber are not also high.If realizing the effect of wavelength-division multiplex using the DWDM equipment as wide area network, setting
Lost more than gain on standby cost.Due to not having fiber amplifier in the application of CWDM, the increase and extension of number of wavelengths are not yet
The limitation of photo-detector amplifier frequency band again, it is possible to use wavelength interval is wider, wavelength accuracy and the relatively low light source of stability requirement, with
And the element such as wave multiplexer, channel-splitting filter, wavelength shifter, the cost of component particularly device is significantly declined.
Generally speaking, in the communication range suitable in Metropolitan Area Network (MAN) or therewith, the cost needs to WDM technology are very low.As
The simple version of DWDM technologies, it is generally not long, less demanding to signal measure of precision that CWDM has adapted to Metropolitan Area Network (MAN) transmission range
Actual features, without being equipped with the equipment such as the high amplifier of price and transceiver, therefore CWDM is a kind of short-distance and medium-distance, multichannel
The economical technical scheme of communication individual transmission.
CWDM technology relevant criterions:
G.694.2, in June, 2002, ITU-T advises proposing wavelength interval for 20nm, operation wavelength from 1270nm to
18 allocative decisions of reuse wavelengths of 1610nm.2003, according to the situation of practical devices, ITU-T again increased centre wavelength
1nm is added.In October, 2003, for point-to-point CWDM systems application optical interface parameter recommendation G.695 in ITU-T 15 groups obtain
Must pass through.
Shown in the following Tables 1 and 2 of the major parameter index of CWDM devices and system.
The CWDM multiplexer/demultiplexer part performance parameter indexs of table 1.
The CWDM system nominal center wavelengths of table 2
As can be seen from the above table, standardized CWDM number of wavelengths is 18 at present, that is to say, that a CWDM system, its
Theoretic maximum available channel quantity is 18.
3rd, the background technology of underground utilities energy supply
Underground utilities local environment is underground sealed space, and bad environments want the detection section along for underground utilities
Point provides operating voltage or electric current, is both inconvenient to connect the larger energy supply cable of power attenuation in electricity transmission process, be also inconvenient to be
Detection node is equipped with the spot lasting energy supply for a long time and can be resistant to the battery of wet environment.If coming real according to both above method
The energy supply of existing detection node at aspects such as technology, technique and energy consumptions, it is necessary to pay larger design and implementation cost.
Chinese invention patent《Underground utilities detection node optical fiber energy supply method and device based on CWDM》(application number：
201410786098.8) to underground utilities, detection node is entered everywhere by signal optical fibre triggering linkage energy supply optical fiber to disclose one kind
Row energy supply makes detection node that energy supply shape is just in when work is needed to realize the device and method of signal detection and data acquisition
State, just power cutoff after the completion of energy supply.But the method can only be powered to detection node all the way, it is impossible to while giving multi-way detecting
Point is powered, and in the method, energy supply optical fiber only has all the way, and such as energy supply optical fiber breaks down, then power will for whole system
Generation problem, reduces the reliability of system operation, and inconvenient system maintenance.
The content of the invention
For the deficiency of background technology, the present invention is by multiple signals optical fiber with corresponding multichannel energy supply optical fiber to buried pipe
Multiple detection nodes carry out energy supply to realize signal detection and data acquisition line everywhere, make multiple detection nodes when work is needed
Energised state can be simultaneously in, just power cutoff after the completion of energy supply.The present invention can well solve underground utilities detection node
The difficult problem of energy supply, improves the reliability of system operation, and is easy to safeguard.
The technical scheme is that：The many detection node optical fiber energy supply methods of underground utilities based on CWDM, including energy supply
Coarse wavelength division multiplexing systems, signal coarse wavelength division multiplexing systems and local monitor center, it is characterised in that：It is further comprising the steps of：
Step one, the selection of local monitor center need multiple detection nodes of energy supply, and by energy supply CWDM system
Respective wavelength in system sends energy supply light to the detection node of required energy supply；
Step 2, the detection node of required energy supply receive energy supply light and carry out opto-electronic conversion, and the electric energy after conversion is saved for detection
Point work；
Step 3, local monitor centrally through detection from the respective wavelength in signal coarse wavelength division multiplexing systems to required energy supply
Node sending signal light, is communicated and is controlled by flashlight to detection node；
Step 4, local monitor center confirm the detection node to required energy supply according to the detection node return data for receiving
Signal detected and data acquisition that such as detection node energy supply is completed, then automatically shut down to the energy supply light of the node and
Flashlight, such as detection node energy supply are not completed, then continued to the node energy supply light and flashlight.
The many detection node optical fiber energy supply methods of underground utilities based on CWDM as described above, it is characterised in that：The step
Rapid three concrete function process is：Local monitor center sends after energy supply light to the multiple detection nodes for needing energy supply, passes through
Respective wavelength and the detection node sending signal light to described required energy supply, local monitor in signal coarse wavelength division multiplexing systems
Center is communicated and is controlled with multiple detection nodes by respective flashlight.
The many detection node optical fiber energy supply methods of underground utilities based on CWDM as described above, it is characterised in that：Described
In many detection nodes each detection node respectively with energy supply coarse wavelength division multiplexing systems, signal coarse wavelength division multiplexing systems in all the way
Optical fiber is connected.
The invention also discloses many detection node optical fiber power supply devices of underground utilities based on CWDM, including the thick wavelength-division of energy supply
Multiplex system, signal coarse wavelength division multiplexing systems, local monitor center and n roads underground utilities detection node, energy supply CWDM
System includes energy supply Coarse Wave Division Multiplexer, energy supply coarse wavelength division demultiplexer；Signal coarse wavelength division multiplexing systems include the thick wavelength-division of signal
Multiplexer, signal coarse wavelength division demultiplexer；Local monitor center include energy supply transceiver and its optical electrical/optical transponder unit and
Signal transceiver and its optical electrical/optical transponder unit；It is characterized in that：Each detection node in described many detection nodes
It is connected with the optical fiber all the way in energy supply coarse wavelength division multiplexing systems, signal coarse wavelength division multiplexing systems respectively；Described energy supply transceiver
And its optical electrical/optical transponder unit, energy supply coarse wavelength division multiplexing systems and connected energy supply optical fiber, for being examined to multiple
Node-node transmission luminous energy is surveyed to power；Signal transceiver and its optical electrical/optical transponder unit, signal coarse wavelength division multiplexing systems and
Coupled signal optical fibre, for multiple detection nodes to be controlled and communicated；Described local monitor is centrally through adopting
The signal for collecting signal transceiver is controlled to energy supply transceiver, and then multiple detection nodes are powered simultaneously, wherein, 1
＜ n≤18.
The many detection node optical fiber power supply devices of underground utilities based on CWDM as described above, it is characterised in that：Described
Confirm whether data acquisition completes after the data of local monitor center reception detection node, the wavelength is closed if completing
Corresponding energy supply transceiver, energy supply is then continued without completion.
The present invention has the advantages that simultaneously multi-way detecting node can be carried out energy supply simultaneously, such as carries out the expansion in N number of direction,
N times that test point can be 18 is played, while line construction of the invention is simple, component used is relatively fewer, so of the invention
Also with system reliability is high, be easy to the features such as safeguarding.
Brief description of the drawings
Fig. 1 is that its multiple detection node are carried out with the local of optical fiber energy supply for one section of underground utilities to constitute；
Fig. 2 is system construction drawing.
Specific embodiment
Be may be selected the present invention relates to a kind of detection node to along underground utilities, controllable optical fiber energy supply, with
Realize to the pipeline on the way system topological and implementation method of the long distance signal detection of node everywhere.
As shown in figure 1, for several detection nodes along ground wire pipeline, energy supply light is realized by n roads energy supply optical fiber
Fibre connection, and CWDM wavelength of the n roads with coupled switch realizes that signal optical fibre is connected.The 1 point-to-point subsystems of road CWDM, at most bag
Containing 18 road wavelength, so one, local monitor center direction can at most dispose 18 monitoring nodes, both direction at most can be with
36 monitoring nodes of deployment, by that analogy.
As shown in Figure 1, many detection node optical fiber energy supply methods of the underground utilities based on CWDM of the invention, including energy supply
Coarse wavelength division multiplexing systems, signal coarse wavelength division multiplexing systems and local monitor center, energy supply coarse wavelength division multiplexing systems bag in the present invention
Include energy supply Coarse Wave Division Multiplexer, the thick wavelength-division demultiplexing of energy supply.Signal coarse wavelength division multiplexing systems include the thick wavelength-division of signal in the present invention
Multiplexer, signal coarse wavelength division demultiplexer.Each of which detection node respectively with energy supply coarse wavelength division multiplexing systems, the thick ripple of signal
Optical fiber all the way in division multiplexing system is connected.Local monitor center include energy supply transceiver and its optical electrical/optical transponder unit and
Signal transceiver and its optical electrical/optical transponder unit, local monitor are received centrally through the signal of collection signal transceiver to energy supply
Hair device is controlled, and then realizes simultaneously being powered multiple detection nodes.
Step one, the selection of local monitor center need multiple detection nodes of energy supply, and by energy supply CWDM system
Respective wavelength in system sends energy supply light to the detection node of required energy supply.I.e. local monitor center is according to business demand, selection
Need to carry out multiple nodes of signal detection and data acquisition, by energy supply coarse wavelength division multiplexing systems with these detection nodes pair
The multichannel wavelength answered, sends energy supply light to these detection nodes respectively.
Step 2, detection node receive energy supply light and carry out opto-electronic conversion, and the electric energy after conversion works for detection node.It is i.e. many
Individual detection node receives the energy supply light for coming from respective wavelength in energy supply coarse wavelength division multiplexing systems, carries out energy opto-electronic conversion, will
The electric energy supply detection node work obtained after conversion.
Step 3, local monitor centrally through detection from the respective wavelength in signal coarse wavelength division multiplexing systems to required energy supply
Node sending signal light, is communicated and is controlled by flashlight to detection node.That is local monitor center is to needing energy supply
Multiple detection nodes are sent after energy supply light, are sent out by the respective wavelength in signal coarse wavelength division multiplexing systems and these detection nodes
Flashlight is sent, local monitor center is communicated and controlled, realized to buried pipe with multiple detection nodes by respective flashlight
The signal detection of line multiple detection node and data acquisition.
Step 4 local monitor center confirms the detection node to required energy supply according to the detection node return data for receiving
Signal detected and data acquisition that such as detection node energy supply is completed, then automatically shut down to the energy supply light of the node and
Flashlight, such as detection node energy supply are not completed, then continued to the node energy supply light and flashlight.I.e. local monitor is centrally through letter
Respective wavelength in number coarse wavelength division multiplexing systems receives the gathered data of multiple detection nodes passbacks, confirms to these nodes
Signal detection and data acquisition have been completed, energy supply of the shut-off in these nodes respective wavelength in energy supply coarse wavelength division multiplexing systems
The flashlight of respective wavelength in light, and signal coarse wavelength division multiplexing systems.
It is thick the invention also discloses a kind of many detection node optical fiber power supply devices of underground utilities based on CWDM, including energy supply
Wavelength-division multiplex system, signal coarse wavelength division multiplexing systems, local monitor center and n roads underground utilities detection node.In local monitor
Pericardium includes energy supply transceiver and its optical electrical/optical transponder unit and signal transceiver and its optical electrical/optical transponder unit, locally
Surveillance center is controlled by gathering the signal of signal transceiver to energy supply transceiver, and then is realized simultaneously to multiple detection section
Point is powered.Energy supply coarse wavelength division multiplexing systems are included：Energy supply Coarse Wave Division Multiplexer, energy supply coarse wavelength division demultiplexer；Signal is thick
Wavelength-division multiplex system is included：Signal Coarse Wave Division Multiplexer, signal coarse wavelength division demultiplexer.Energy supply transceiver and its optical electrical/light wave
Converter long, energy supply coarse wavelength division multiplexing systems and connected energy supply optical fiber, for transmitting luminous energy to multiple detection nodes
To power；Signal transceiver and its optical electrical/optical transponder unit, signal coarse wavelength division multiplexing systems and coupled signal
Optical fiber, for multiple detection nodes to be controlled and communicated.
High-power energy laser needed for energy supply transceiver sends energy supply in the present invention, is turned by optical electrical/optical transponder unit
Change the energy laser of different wave length into, be multiplexed and transmitted by energy supply Coarse Wave Division Multiplexer, will not through energy supply coarse wavelength division demultiplexer
The energy laser of co-wavelength is transferred to multiple to be needed at the detection node of energy supply.Each detection node turns including energy photoelectricity
Change, detection node is powered；Each detection node connects corresponding wavelength in energy supply coarse wavelength division multiplexing systems respectively；Locally
Energy supply transceiver corresponding to the multiple detection nodes of Surveillance center's control is turned on and off, and then realizes to multiple detection nodes
Energy supply simultaneously, the maximum node number that be can be detected in an energy supply coarse wavelength division multiplexing systems is 18.
Signal transceiver sends the information laser needed for controlling and communicating, and difference is converted into by optical electrical/optical transponder unit
The information laser of wavelength, is multiplexed and is transmitted by signal Coarse Wave Division Multiplexer, through signal coarse wavelength division demultiplexer by different wave length
Information Laser Transmission to multiple need control and communicate detection nodes at, each detection node include signal opto-electronic conversion,
Detection node signal detection and data acquisition；Each detection node connects corresponding in signal coarse wavelength division multiplexing systems respectively
Wavelength；Signal transceiver communication corresponding to the multiple detection nodes of local monitor center control, and then realize detecting multiple
The signal detection of node and data acquisition, the maximum node number that be can be detected in a signal coarse wavelength division multiplexing systems are 18.
Multi-way detecting section in the present invention on a certain section of underground utilities can be obtained to it by energy supply coarse wavelength division multiplexing systems
The energy supply of circuit, realizes signal detection and gathered data and passes back to local monitor center by signal coarse wavelength division multiplexing systems,
Local monitor center is according to business demand, while carrying out energy supply and subsequent treatment to multiple detection nodes.
The course of work of the present invention is：For several detection nodes along ground wire pipeline, by multichannel energy supply optical fiber reality
Energy supply connection of the existing energy supply optical fiber to each detection node in multichannel, by multiple signals optical fiber realize in multichannel each
The detection of the working condition of detection node.When certain or many places detection node need work in the present system, in local monitor
The transceiver of certain wavelength in CWDM corresponding with the node or multiple node is opened at center, and the triggering of the transmitter trigger node is believed
Number, after O/E/O carries out wavelength convert, the CWDM of entrance realizes multiplexing, transmission and demultiplexes, and energy supply optical fiber is passed through O/E
Conversion provides working power to node.Each detection node completes sensor signal detection by the power supply that energy supply optical fiber is provided
After data acquisition, the data back that will be collected by signal optical fibre to local monitor center, local monitor center is received
Confirm whether data acquisition completes after the data of detection node, the corresponding energy supply transmitting-receiving of the wavelength is closed if completing
Device, energy supply is then continued without completion.
Except it is above-mentioned for certain all the way the chain pipeline of underground utilities in addition to, for topological structure ratio in the bottom line pipeline of city
More complicated ring-type pipeline and grid pipeline, its topological structure also can be decomposed into several chains individually to process, respectively
Section chain pipeline belongs to respective local monitor center to realize the signal detection under the conditions of optical fiber energy supply and data acquisition.Each
Between ground Surveillance center, connection collocation remote monitoring center can be concentrated by being easy to the optical fiber cable for field operation in urban deployment, such as
Shown in Fig. 2.
If Fig. 2 is to set the Surveillance center for many detection node optical fiber energy supplying system topological diagrams of multistage underground utilities
This depot siding is set in central point physically or logically, then two side CWDMs of this pipe string at Surveillance center two ends
In system, total can dispose 36 monitoring nodes.
The present invention is directed to most common liquid type oil, water supply and flowing line in underground utilities, with its leak detection skill
The negative pressure wave detecting method of most main flow considers in art, and maximum monitoring distance empirical value is 50 kilometers, that is, two on pipeline
Need control within 50 kilometers between individual monitoring node, accurate leakage point could be obtained using suction wave computational methods
Positioning.
And CWDM systems are under the conditions of non-relay, point-to-point transmission range representative value is up to 40,80 and 120 kilometers (depending on choosing
Depending on selecting module).That is, in the case where not relayed with reserve line image intensifer to CWDM systems additionally, no matter
It is the coarse wavelength division multiplexing systems of selection 40,80 or 120 km transmission distances, also can also all meets the suction wave inspection of most main flow
50 kilometers required for survey technology are apart from this requirement.
It is most long by 40 between from point to points, from the point of view of 80 or 120 kilometers, the system built using this method can meet city completely
Monitoring distance requirement in the range of city.In addition, can be from the point of view of monitoring node 36 from a pipeline both direction maximum, each node
Between spacing be able to can farthest be controlled within 4 kilometers close to 1 kilometer recently, from the detection of pipeline leakage point positioning and should
From the point of view of anxious process angle, 1~4 kilometer of requirement that can meet pipeline monitoring.
Beneficial effects of the present invention：
First, this method carries out selective multipoint sensor energy supply using the multichannel independent light transmission channel of CWDM,
Avoid under traditional approach in City Buried Pipeline monitoring using remote cable energy supply and the defect of local battery energy supply, can be with
Energy supply neatly is carried out simultaneously to one or more detection node according to the actual requirements.In local and remote monitoring center to specific
Detection node carry out specific aim triggering energy supply and signal detection and data acquisition, signal detection need not carried out and data are adopted
In the case of collection, the part and entirety of system may be in the state of non-transformer consumption.
Meanwhile, the CWDM transmission networks that this method is used are fully able to meet from its communication distance and are examined with suction wave
Survey method is the City Buried Pipeline monitoring requirements of mainstream technology.
And, the gathered data being transmitted with optical signal in this method also can guarantee that its communication channel will not be subject to
The interference of electromagnetic field influence of other forceful electric power, light current pipeline in underground utilities local environment.
Additionally, the underground utilities sensing node that configuration mode is employed in this method is more durable, in principle, as long as not receiving
Destruction to external physical active force just can be with normal work, and light path will not operationally generate heat as circuit, regardless of
Radiating, is particularly suited for the enclosed environment of underground utilities.
Claims (4)
1. many detection node optical fiber energy supply methods of underground utilities based on CWDM, be applied to include energy supply coarse wavelength division multiplexing systems,
In many detection node optical fiber power supply devices of underground utilities based on CWDM at signal coarse wavelength division multiplexing systems and local monitor center,
It is characterized in that：It is further comprising the steps of：
Step one, the selection of local monitor center need multiple detection nodes of energy supply, and by energy supply coarse wavelength division multiplexing systems
Detection node from respective wavelength to required energy supply send energy supply light；
Step 2, the detection node of required energy supply receive energy supply light and carry out opto-electronic conversion, and the electric energy after conversion supplies detection node work
Make；
Step 3, local monitor centrally through detection node from the respective wavelength in signal coarse wavelength division multiplexing systems to required energy supply
Sending signal light, is communicated and is controlled by flashlight to detection node；
Step 4, local monitor center confirm the letter to the detection node of required energy supply according to the detection node return data for receiving
Number detected and data acquisition, such as detection node energy supply is completed, then automatically shut down the energy supply light and letter to detection node
Number light, such as detection node energy supply are not completed, then continued to detection node energy supply light and flashlight.
2. many detection node optical fiber energy supply methods of underground utilities of CWDM are based on as claimed in claim 1, it is characterised in that：Institute
In many detection nodes stated each detection node respectively with energy supply coarse wavelength division multiplexing systems, signal coarse wavelength division multiplexing systems in
Optical fiber is connected all the way.
3. many detection node optical fiber power supply devices of underground utilities based on CWDM, including energy supply coarse wavelength division multiplexing systems, signal be thick
Wavelength-division multiplex system, local monitor center and n roads underground utilities detection node, energy supply coarse wavelength division multiplexing systems include the thick ripple of energy supply
Division multiplexer, energy supply coarse wavelength division demultiplexer；Signal coarse wavelength division multiplexing systems include signal Coarse Wave Division Multiplexer, the thick wavelength-division of signal
Demultiplexer；Local monitor center include energy supply transceiver and its optical electrical/optical transponder unit and signal transceiver and its light/
Electrical/optical wavelength shifter；
It is characterized in that：In described many detection nodes each detection node respectively with energy supply coarse wavelength division multiplexing systems, signal
Optical fiber all the way in coarse wavelength division multiplexing systems is connected；Described energy supply transceiver and its optical electrical/optical transponder unit, energy supply are thick
Wavelength-division multiplex system and connected energy supply optical fiber, power for transmitting luminous energy to multiple detection nodes；Signal transmitting and receiving
Device and its optical electrical/optical transponder unit, signal coarse wavelength division multiplexing systems and coupled signal optical fibre, for multiple
Detection node is controlled and communicates；Described local monitor is centrally through the signal of collection signal transceiver to energy supply transceiver
It is controlled, and then multiple detection nodes is powered simultaneously, wherein, 1 ＜ n≤18.
4. many detection node optical fiber power supply devices of underground utilities of CWDM are based on as claimed in claim 3, it is characterised in that：Institute
Confirm whether data acquisition completes after the data of the local monitor center reception detection node stated, closed if completing
The corresponding energy supply transceiver of reception detection node of data acquisition, energy supply is then continued without completion.
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| CN109274434B (en) * | 2018-11-07 | 2022-04-15 | 桂林电子科技大学 | Light energy and light signal receiving and transmitting processing system based on single optical fiber integrated optical cable |
| JP6814258B1 (en) * | 2019-08-02 | 2021-01-13 | 京セラ株式会社 | Fiber optic power supply system |
| CN111721992B (en) * | 2020-06-19 | 2022-09-06 | 贵州江源电力建设有限公司 | Optical fiber sensing system for measuring current intensity of three-phase high-voltage conductor |
| CN115248482B (en) * | 2021-04-26 | 2024-04-09 | 中国移动通信有限公司研究院 | Optical switch structure and optical line protection system |
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| JP2011197935A (en) * | 2010-03-18 | 2011-10-06 | Central Res Inst Of Electric Power Ind | Multipoint optical fiber sensor device and node communication control method for the same |
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| JP2011197935A (en) * | 2010-03-18 | 2011-10-06 | Central Res Inst Of Electric Power Ind | Multipoint optical fiber sensor device and node communication control method for the same |
| CN103138834A (en) * | 2011-11-29 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Optical fiber transmission system |
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