CN106988735A - High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system - Google Patents
High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system Download PDFInfo
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- CN106988735A CN106988735A CN201710344020.4A CN201710344020A CN106988735A CN 106988735 A CN106988735 A CN 106988735A CN 201710344020 A CN201710344020 A CN 201710344020A CN 106988735 A CN106988735 A CN 106988735A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 85
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 230000002463 transducing effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 239000011551 heat transfer agent Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
- E21B47/135—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Fluid Mechanics (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Electromagnetism (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Sensed the invention discloses a kind of high temperature high voltage resistant optical fiber fully-automatic intelligent in protection system, including control system and sensor-based system, control system, light source and photodetector are connected by optical fiber circulator with fiber coupler respectively；Fiber coupler is connected with N number of wavelength division multiplexer respectively；N number of sensor (FBG) demodulator for demodulating fibre optical sensor to be protected is connected by wavelength division multiplexer with photoswitch respectively；Microprocessor is connected with photodetector and N number of photoswitch respectively；Sensor-based system is corresponded and identical spare fibre sensor with fibre optical sensor to be protected respectively including N number of；The system is distinguished the signal power value that different sensors are reflected back by the design of light channel structure, it is used as basis for estimation when breaking down, automatically switch to alternate channel, sensing is made a distinction with control section simultaneously, the sensor-based system into underground is set to use passive design, it is ensured that it can be maintained at long-term work under high temperature and high pressure environment.
Description
Technical field
The present invention relates to sensor protection technical field, more particularly to a kind of high temperature high voltage resistant optical fiber fully-automatic intelligent sensing
Protection system.
Background technology
With the continuous exploitation in oil field, the depth of Oil/gas Well is continuously increased, and downhole temperature and pressure are also accordingly raised, and is limited
In the size, structure and test scope of traditional electrical sensor, it is impossible to which realization is entered to characteristic parameters such as oil gas downhole temperature, pressure
Row is real-time, high precision monitor.Due to optical fiber have lightweight, diameter it is small, on structural material influence small, sensitivity it is high, anticorrosive,
High temperature resistant, electromagnetism interference, bandwidth and the advantages of can sense many kinds of parameters, Fibre Optical Sensor measuring technology has become oil field and opened
The technology being increasingly taken seriously is sent out, can be achieved to believe the undergrounds such as full temperature in wellbore, underground pinpoint pressure, distributed vibration information
The measurement of breath.
However, because optical fiber is more fragile in itself, down-hole application environment is generally the small space under high-temperature and high-pressure conditions in addition,
Working environment is severe, and the damage of optical cable and fibre optical sensor can be caused often, the success rate of test is reduced, or even can not be normal
Work, job site has to again tubing string be carried out to put to put operation with more emat sensor, wastes corresponding manpower and materials
Cost.
The temporary optical-fiber intelligent sensing system and the relevant report of network structure having no for oil and gas well testing domestic at present.With
Oil and gas well testing field is applied to toward fibre optical sensor, any intelligent protection device of design is showed no, but directly by sense light
Fine or sensor is placed in test environment i.e. oil well or gas well desired depth according to detail design.Therefore, design a kind of corresponding
Optical-fiber intelligent sensing protection device tool is of great significance.Therefore, the purpose of patent of the present invention is that design one kind can
To measure the sensing device that the fibre optical sensor of different parameters provides intelligent protection.
The content of the invention
Measured in real time for underground it is an object of the invention to provide one kind and can be different types of fibre optical sensor
The high temperature high voltage resistant optical fiber fully-automatic intelligent sensing protection system of fully-automatic intelligent protection is provided.
Therefore, technical solution of the present invention is as follows：
A kind of high temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system, including the control being arranged in ground control box
System and the sensor-based system positioned at underground；The control system includes, N number of wavelength division multiplexer, N number of photoswitch, light source, fiber optic loop
Shape device, photodetector, microprocessor and fiber coupler；N quantity is consistent with the quantity of fibre optical sensor to be protected；Its
In,
The light source and the photodetector are connected by the optical fiber circulator with the fiber coupler respectively, are made
The optical signal that the light source is sent can only be sent to the fiber coupler by the optical fiber circulator, and be back to the light
The optical signal of fine coupler can only be sent to the photodetector by the optical fiber circulator；
The fiber coupler has N number of port, is connected respectively with N number of wavelength division multiplexer；
For demodulating N number of sensor (FBG) demodulator of fibre optical sensor to be protected respectively by a wavelength division multiplexer and one
Photoswitch is connected；Each photoswitch includes two optional transmission ports for being used to be connected with sensor；
The microprocessor is connected with the photodetector and N number of photoswitch respectively；
The sensor-based system includes N number of spare fibre sensor, and each spare fibre sensor respectively with it is to be protected
Fibre optical sensor is corresponded and identical；Each spare fibre sensor corresponds to a photoswitch and opened with the light respectively
The a port connection of pass, and another port of the photoswitch is connected with identical fibre optical sensor to be protected；
One layer of resistant to elevated temperatures metal is coated with the optical fiber tail-end of each fibre optical sensor to be protected and each spare fibre sensor
Reflectance coating.The sensor-based system uses passive design, fully meets long-term work under high temperature and high pressure environment.
Further, the system also includes the industrial computer in centrally disposed control room；The industrial computer is passed with N number of respectively
Sensor (FBG) demodulator and microprocessor connection.
Further, the light source is LASER Light Source.
Further, the resistant to elevated temperatures metallic reflective coating is gold-plated film.
Further, the light letter that the service band and the light source for the transducing signal that the sensor (FBG) demodulator is sent are sent
Number service band be non-interfering different-waveband.
The high temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system by the design of light channel structure by different sensors
The signal power value being reflected back is distinguished, and as basis for estimation when breaking down, switching command is sent from trend photoswitch, will
Sensing passage is that transducing signal switches to alternate channel, and the whole process time is very short, does not influence normal operation of sensor；Meanwhile,
Due to transducing part and control section are divided into the two parts being arranged on above and below the ground, adopt the sensor-based system into underground
With passive design, it is ensured that it can be maintained at long-term work under high temperature and high pressure environment.
Brief description of the drawings
Fig. 1 is used for for the high temperature high voltage resistant optical fiber fully-automatic intelligent sensing protection system designed in embodiments of the invention 1
The structural representation of fibre optical sensor protection.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair
It is bright to have any limitation.
It is that the high temperature high voltage resistant optical fiber fully-automatic intelligent designed for reflective optical sensor senses protection as shown in Figure 1
System.The fibre optical sensor loaded in the system is used for the long-term measurement to full temperature in wellbore and multipoint pressure, and it mainly includes
Transducing part and demodulation part；Wherein, transducing part includes an optical fiber distributed temperature biography being made up of single single-mode fiber
Sensor and the optical fiber Bragg light being made up of single single-mode fiber and two grating sensors being connected on single-mode fiber
Grid point type pressure sensor；Demodulation part includes being connected to demodulate optical fiber distributed temperature biography respectively respectively with two sensors
Two sensor (FBG) demodulators 2 of the heat transfer agent of sensor 501 and Fiber Bragg Grating FBG point type pressure sensor 1001.
Specifically, high temperature high voltage resistant optical fiber fully-automatic intelligent sensing protection system, including be arranged in ground control box 1
Control system, the sensor-based system positioned at underground and centrally disposed control room in be used for man-machine interactive operation industrial computer 11；
Wherein, two sensor (FBG) demodulators 2 are also disposed in ground control box 1.
Control system includes LASER Light Source 7, optical fiber circulator 8, photodetector 9, microprocessor 12, fiber coupler
13rd, two sensor (FBG) demodulators 2, two wavelength division multiplexers 3 and two photoswitches 4；Sensor-based system includes two and light to be protected
The identical spare fibre sensor of fiber sensor, specifically includes a spare fibre being made up of single single-mode fiber and is distributed
Formula temperature sensor 502 and a standby grating sensor being connected on by single single-mode fiber and two on single-mode fiber are constituted
Spare fibre Bragg grating point type pressure sensor 1002.Wherein, fiber optic distributed temperature sensor 501 and spare fibre
Distributed temperature sensor 502 is first group of sensor unit, Fiber Bragg Grating FBG point type pressure sensor 1001 and standby
Fiber Bragg Grating FBG point type pressure sensor 1002 is second group sensor unit.When needing to carry out underground survey, optical fiber
Distributed temperature sensor 501, spare fibre distributed temperature sensor 502, Fiber Bragg Grating FBG point type pressure sensor
1001 and spare fibre Bragg grating point type pressure sensor 1002 using be tied to it is a branch of by the way of send into underground, for pair
Corresponding data is carried out to measure；
Optical fiber circulator 8 has three ports that can realize that two kinds of optical signals are oriented to, and makes LASER Light Source 7 and photodetection
Device 9 is connected by optical fiber circulator 8 with fiber coupler 13 respectively；The optical signal for sending LASER Light Source 7 passes through fiber annular
Device 8 is directed to the port being connected with fiber coupler 13, and is back to the optical signal of fiber coupler 13 then by fiber annular
Device 8 is directed to the port being connected with photodetector 9, specifically, using optical fiber circulator 8, the list for sending LASER Light Source 7
Optical signals can only be sent to fiber coupler 13 by optical fiber circulator 8, and the optical signal returned can only then pass through fiber optic loop
Shape device 8 is sent to photodetector 9 and detected；Wherein, LASER Light Source 7 is continuous light, that is, continuously sends out monochromatic optical signal, make
Each channel fiber moment is in monitored state.
Because fibre optical sensor to be protected is fiber optic distributed temperature sensor 501 and Fiber Bragg Grating FBG point type pressure
Force snesor 1001, totally two；Therefore, correspondence, which completes light path detection and two wavelength division multiplexers 3 of control, includes the first wavelength-division
Multiplexer and the second wavelength division multiplexer, two photoswitches 4 include the first photoswitch and the second photoswitch；Specifically, the first wavelength-division
Multiplexer and the second wavelength division multiplexer are connected with fiber coupler 13 respectively；First wavelength division multiplexer is connected with the first photoswitch,
First photoswitch, which includes two, is used for the optional transmission ports that are connected with sensor, two ports respectively with first group of sensor
The signal incidence end connection of fiber optic distributed temperature sensor 501 and spare fibre distributed temperature sensor 502 in unit；
And the second wavelength division multiplexer is connected with the second photoswitch, the second photoswitch also includes two optional biographies for being used to be connected with sensor
Defeated port, two ports respectively with the Fiber Bragg Grating FBG point type pressure sensor 1001 in second group sensor unit and
The signal incidence end connection of spare fibre Bragg grating point type pressure sensor 1002.
Microprocessor 12 is connected with the photoswitch of photodetector 9 and first and the second photoswitch respectively, for photoelectricity
The optical signal result that detector 9 is received is judged, and feeds back to the first photoswitch or the second photoswitch, changes optional transmission
The connection status of port.Specifically, microprocessor 12 can select C8051F series monolithics, and mould is instructed as described above by loading
The corresponding control program of formula realizes the regulation to fibre optical sensor communicating passage.
Because system is the detection based on the monitoring signal luminous intensity to being reflected back to the monitoring of each passage health status,
Therefore, in fiber optic distributed temperature sensor 501, spare fibre distributed temperature sensor 502, Fiber Bragg Grating FBG point type
The optical fiber tail-end of pressure sensor 1001 and spare fibre Bragg grating point type pressure sensor 1002 is coated with one layer of resistance to height
The reflection gold-plated film 6 of temperature.
Former two sensor (FBG) demodulators 2 in demodulation part, one is connected with the first wavelength division multiplexer, another and the second wavelength-division
Multiplexer is connected, by wavelength division multiplexer and photoswitch to the sensor or backup sensors being in photoswitch under connected state
Transmission sensing signal, is demodulated with realizing to the transducing signal passed back from sensor or backup sensors, is completed to full pit shaft
The measurement of temperature and multipoint pressure.Wherein, at wavelength division multiplexer 3, transducing signal and monochromatic prison that sensor (FBG) demodulator 2 is sent
Control optical signal is merged into a branch of, is transmitted by photoswitch to sensor.
The list that will be sent at fiber coupler 13 is realized using above-mentioned first wavelength division multiplexer and the second wavelength division multiplexer
Coloured light signal is divided into Liang Tiao optic paths branch, and realizes that the working condition respectively to two sensors to be protected is persistently supervised
Survey；Specifically, the monochromatic optical signal for entering fiber coupler 13 is divided into by two-way light by fiber coupler 13 by a certain percentage
The different optical signal of intensity, and respectively enter Liang Tiao optic paths branch by two wavelength division multiplexers 3；In an initial condition,
First wavelength division multiplexer is connected by the first photoswitch with fiber optic distributed temperature sensor 501, makes to enter the first wavelength-division multiplex
The optical signal of device is transmitted to fiber optic distributed temperature sensor 501 by the first photoswitch, using optical signal principle of reflection, such as
Fruit fiber optic distributed temperature sensor 501 is working properly, and optical signal sequentially passes through the first photoswitch, after being reflected through tail end
One wavelength division multiplexer, fiber coupler and optical fiber circulator, finally feed back to photodetector 9；When photodetector 9 is received
During the optical signal of corresponding luminous intensity, microprocessor 12 does not change the port connection state of the first photoswitch；And when photodetector 9
When not receiving the optical signal of corresponding luminous intensity, microprocessor 12 changes the port connection state of the first photoswitch, makes first wave
Division multiplexer is connected by the first photoswitch with spare fibre distributed temperature sensor 502, to recover the normal work of sensor
Make state, now, the sensor signal that the sensor (FBG) demodulator 2 being connected with the first wavelength division multiplexer is sent is in the first wavelength-division multiplex
Merged at device with unilateral optical signal it is a branch of after transmitted by the first photoswitch to spare fibre distributed temperature sensor 502.
Similarly, in an initial condition, the second wavelength division multiplexer passes through the first photoswitch and Fiber Bragg Grating FBG point type pressure
Force snesor 1001 is connected, and the optical signal into the second wavelength division multiplexer is transmitted by the second photoswitch to optical fiber Bragg light
On grid point type pressure sensor 1001, using optical signal principle of reflection, if light Fiber Bragg Grating FBG point type pressure sensor
1001 is working properly, and optical signal sequentially passes through the second photoswitch, the second wavelength division multiplexer, fiber coupling after being reflected through tail end
Device and optical fiber circulator, finally feed back to photodetector 9；When photodetector 9 receives the optical signal of corresponding luminous intensity,
Microprocessor 12 does not change the port connection state of the second photoswitch；And when photodetector 9 does not receive corresponding luminous intensity
During optical signal, microprocessor 12 changes the port connection state of the second photoswitch, the second wavelength division multiplexer is opened by the second light
Pass is connected with spare fibre Bragg grating point type pressure sensor 1002, to recover the normal operating conditions of sensor, now,
The sensor signal that the sensor (FBG) demodulator 2 being connected with the second wavelength division multiplexer is sent at the second wavelength division multiplexer with unilateral light
Signal merge into it is a branch of after transmitted by the second photoswitch to spare fibre Bragg grating point type pressure sensor 1002.
To avoid interfering between transducing signal and optical signal, the transducing signal for typically sending sensor (FBG) demodulator 2
Service band and the service band of optical signal that sends of LASER Light Source 7 be set to the different-waveband not disturbed mutually.
Industrial computer 11 in central control room；Industrial computer 11 is counted with two sensor (FBG) demodulators 2 and microprocessor 12 respectively
Connected according to line；By way of man-machine interaction, real-time monitored condition and optical fiber connected state to control system understand, together
When artificially the operational factor of sensor (FBG) demodulator 2 and the connected state of photoswitch 4 can also be modified as needed.
Claims (5)
1. a kind of high temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system, it is characterised in that including being arranged on ground control
Control system in case (1) and the sensor-based system positioned at underground；The control system includes N number of wavelength division multiplexer (3), N number of light
Switch (4), light source (7), optical fiber circulator (8), photodetector (9), microprocessor (12) and fiber coupler (13)；N's
Quantity is consistent with the quantity of fibre optical sensor to be protected；Wherein,
The light source (7) and the photodetector (9) pass through the optical fiber circulator (8) and the fiber coupler respectively
(13) connect, the optical signal that the light source (7) is sent the fiber coupling can only be sent to by the optical fiber circulator (8)
Device (13), and the optical signal for being back to the fiber coupler (13) can only be sent to by the optical fiber circulator (8) it is described
Photodetector (9)；
The fiber coupler (13) has N number of port, is connected respectively with N number of wavelength division multiplexer (3)；
For demodulating N number of sensor (FBG) demodulator (2) of fibre optical sensor to be protected respectively by a wavelength division multiplexer (3) and one
Individual photoswitch (4) connection；Each photoswitch (4) includes two optional transmission ports for being used to be connected with sensor；
The microprocessor (12) is connected with the photodetector (9) and N number of photoswitch (4) respectively；
The sensor-based system includes N number of spare fibre sensor, and each spare fibre sensor respectively with optical fiber to be protected
Sensor is corresponded and identical；Each spare fibre sensor corresponds to a photoswitch (4) and opened with the light respectively
The a port connection of (4) is closed, and makes another port of the photoswitch (4) and identical fibre optical sensor to be protected
Connection；The optical fiber tail-end of each fibre optical sensor to be protected and each spare fibre sensor be coated with one layer it is resistant to elevated temperatures
Metallic reflective coating (6).
2. high temperature high voltage resistant optical fiber fully-automatic intelligent according to claim 1 senses protection system, it is characterised in that also wrap
Include the industrial computer (11) in centrally disposed control room；The industrial computer (11) is respectively with microprocessor (12) and for demodulating
N number of sensor (FBG) demodulator (2) connection of fibre optical sensor to be protected.
3. high temperature high voltage resistant optical fiber fully-automatic intelligent according to claim 1 senses protection system, it is characterised in that described
Light source (7) is LASER Light Source.
4. high temperature high voltage resistant optical fiber fully-automatic intelligent according to claim 1 senses protection system, it is characterised in that described
Resistant to elevated temperatures metallic reflective coating is gold-plated film.
5. high temperature high voltage resistant optical fiber fully-automatic intelligent according to claim 1 senses protection system, it is characterised in that described
The service band for the optical signal that the service band and the light source (7) for the transducing signal that sensor (FBG) demodulator (2) is sent are sent is
Non-interfering different-waveband.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710344020.4A CN106988735A (en) | 2017-05-16 | 2017-05-16 | High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710344020.4A CN106988735A (en) | 2017-05-16 | 2017-05-16 | High temperature high voltage resistant optical fiber fully-automatic intelligent senses protection system |
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|---|---|---|---|---|
| CN2934569Y (en) * | 2006-02-24 | 2007-08-15 | 中国石油天然气集团公司 | Optical fiber test device suitable for permanent oil gas production well |
| CN201074511Y (en) * | 2007-08-10 | 2008-06-18 | 中国石油天然气集团公司 | System for testing optical fiber flux of permanence hyperthermia oil gas commercial well |
| CN101393304A (en) * | 2008-11-12 | 2009-03-25 | 北京交通大学 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
| CN103512510A (en) * | 2013-10-23 | 2014-01-15 | 中国电子科技集团公司第三十四研究所 | Fiber bragg grating sensing system based on narrow-band scanning light source and operation method |
| WO2016180287A1 (en) * | 2015-05-08 | 2016-11-17 | 南京微创医学科技有限公司 | Method and system for processing oct signal using general-purpose graphics processing unit |
-
2017
- 2017-05-16 CN CN201710344020.4A patent/CN106988735A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2934569Y (en) * | 2006-02-24 | 2007-08-15 | 中国石油天然气集团公司 | Optical fiber test device suitable for permanent oil gas production well |
| CN201074511Y (en) * | 2007-08-10 | 2008-06-18 | 中国石油天然气集团公司 | System for testing optical fiber flux of permanence hyperthermia oil gas commercial well |
| CN101393304A (en) * | 2008-11-12 | 2009-03-25 | 北京交通大学 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
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