CN108872150A - A kind of dual wavelength gain competition apparatus for measuring refractive index - Google Patents
A kind of dual wavelength gain competition apparatus for measuring refractive index Download PDFInfo
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- CN108872150A CN108872150A CN201710338581.3A CN201710338581A CN108872150A CN 108872150 A CN108872150 A CN 108872150A CN 201710338581 A CN201710338581 A CN 201710338581A CN 108872150 A CN108872150 A CN 108872150A
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- wavelength
- fiber
- optical fiber
- refractive index
- micrometer structure
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
Abstract
The invention discloses a kind of dual wavelength gain competition apparatus for measuring refractive index, including 980nm pumping source to be connected to Er-doped fiber by wavelength division multiplexer；The both ends for being connected to above structure with optical fiber total reflective mirror in bragg grating constitute laser resonator；Adjustable optical attenuator is embedded between the bragg grating and the wavelength division multiplexer；One input arm of fiber coupler and a coupling arm are connected between the adjustable optical attenuator and the wavelength division multiplexer, another input terminal of fiber coupler is connected to another bragg grating by micrometer structure optical fiber probe module, and another output is connected to spectroanalysis instrument.The present invention utilizes the dual wavelength gain competition structure of two laser resonators, the acute variation of the Output optical power of a wavelength caused by solution variations in refractive index is monitored by micrometer structure optical fiber probe module, to realize the high-sensitivity measurement of refractive index.
Description
Technical field
The invention belongs to laser refraction rate field of measuring technique more particularly to a kind of dual wavelength gain competition refractometries
Device.
Background technique
Accurate optical fibre refractivity measurement is highly important in fiber optic communication and optical fiber sensing system.High sensitivity folding
The important research direction that rate sensing is sensory field of optic fibre is penetrated, it is all related in many levels of modern industry application.
Due to some good characteristics of optical fiber：Size is small, at low cost, electromagnetism interference, high temperature high voltage resistant etc., the folding based on fiber form
The rate sensor of penetrating has become a mainstream hot spot in refractive index sensing field at present.In optical-fiber type index sensor, research is most
To be widely exactly interference-type optical fiber index sensor.Although this index sensor sensitivity is higher, it is vulnerable to outer
The problem of boundary's environmental disturbances, other parameters cross sensitivity, but can not be ignored.Optical fiber based on dual wavelength or polarization beat frequency means
Index sensor is generally easy to demodulation, high sensitivity, reliable and stable, but two matched FBGs are complex.Intensity type optical fiber
Index sensor often has the advantages that real-time response, structure are simple, but sensitivity is to be improved.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of dual wavelength gain competition apparatus for measuring refractive index, have
The advantage that high sensitivity, structure are simple, response is rapid.
The technical solution adopted by the present invention to solve the technical problems is：A kind of dual wavelength gain competition refractive index survey is provided
Measure device, including erbium-doped fiber amplifier, No.1 bragg grating, optical fiber total reflective mirror, fiber coupler, No. two Prague
Fiber grating, micrometer structure optical fiber probe module, spectroanalysis instrument, pumping source are connected to Er-doped fiber structure by wavelength division multiplexer
At erbium-doped fiber amplifier, one end of erbium-doped fiber amplifier connects No.1 bragg grating, erbium-doped fiber amplifier
The other end connect optical fiber total reflective mirror, also set up variable optical attenuation between erbium-doped fiber amplifier and No.1 bragg grating
One input arm of device, fiber coupler is connect with adjustable optical attenuator, and a coupling arm is connect with wavelength division multiplexer, optical fiber coupling
Another input arm of clutch is connected to No. two bragg gratings by micrometer structure optical fiber probe module, another coupling
Arm is connected to spectroanalysis instrument, and spectroanalysis instrument is used to detect the wavelength and changed power situation of dual-wavelength laser output；Micron
Structured optical fiber detecting module is made of solution and the biconial micrometer structure optical fiber impregnated in the solution.
According to the above technical scheme, the reflectivity of optical fiber total reflective mirror is 100%, and the splitting ratio of fiber coupler is 50:50.
According to the above technical scheme, biconial micrometer structure optical fiber is that two conical transition zones clip one section of very thin cone lumbar region
Domain, the diameter in cone lumbar region domain are 5~15 μm, and cone lumbar region length of field is 5~15mm, and the both ends of biconial micrometer structure optical fiber connect
Connect standard single-mode fiber.Micrometer structure optical fiber probe module is set directly effectively to sense the sensitivity of environmental liquids refractive index
Variation.Biconial micrometer structure optical fiber is made of flame fused biconical taper method.
According to the above technical scheme, pumping source is 980nm pumping source, and wavelength division multiplexer is the light of wavelength 980nm and 1550nm
Partial wave multiplex, the central wavelength of No.1 bragg grating are 1550nm, and the central wavelength of No. two bragg gratings is
1551nm, adjustable optical attenuator are used to adjust the output power of 1550nm wavelength laser, make the output power and 1551nm wavelength
The absolute value differences of the power of laser are within the scope of 1dBm.It is fierce that the power difference of two wavelength lasers can obtain comparison when smaller
Gain competition phenomenon so that sensing arrangement is very sensitive to the variation of extraneous refractive index.
According to the above technical scheme, the amplification coefficient of Er-doped fiber is 10dB/m, and length is 8~12m.
No.1 bragg grating, erbium-doped fiber amplifier, optical fiber total reflective mirror, adjustable optical attenuator constitute first and mix
Erbium optical fiber laser, the output wavelength of the first erbium doped fiber laser are the central wavelength of No.1 bragg grating：
1550nm, three dB bandwidth 0.2nm.No. two bragg gratings and optical fiber total reflective mirror constitute another laser resonator, with
Aforementioned erbium-doped fiber amplifier constitutes the second erbium doped fiber laser, and laser output wavelength is No. two bragg gratings
Central wavelength：1550nm, three dB bandwidth 0.2nm.
The working principle of the invention is：The bragg grating as similar in two central wavelengths and optical fiber total reflective mirror respectively
Two laser resonators constituted constitute dual wavelength erbium doped fiber laser together with erbium-doped fiber amplifier.One of laser
The output power that intracavitary insertion adjustable optical attenuator is used to adjust dual-wavelength laser makes them be in the level being not much different, due to
Dual-wavelength laser shares same section of Er-doped fiber as gain media, when the micrometer structure fiber-optic probe in sensing wavelength laser cavity
When module is generated minimum power loss variations by extraneous refractive index perturbation, it will cause sensing wavelength laser output power
Greatly variation, the optical power change monitored using spectroanalysis instrument can demodulate to obtain the change information of extraneous refractive index, thus
Realize the high-sensitivity measurement to extraneous refractive index.
The beneficial effect comprise that：In the case of sharing same gain media using dual wavelength erbium doped fiber laser
Gain competition, realize to the high-sensitivity measurement of liquid refractivity, while the advantage that structure is simple, response is rapid.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the structural schematic diagram of dual wavelength gain competition apparatus for measuring refractive index of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of micrometer structure optical fiber probe module.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
In the embodiment of the present invention, a kind of dual wavelength gain competition apparatus for measuring refractive index, including Erbium-doped fiber amplifier are provided
Device, No.1 bragg grating, optical fiber total reflective mirror, fiber coupler, No. two bragg gratings, micrometer structure optical fiber are visited
Module, spectroanalysis instrument are surveyed, pumping source is connected to Er-doped fiber by wavelength division multiplexer and constitutes erbium-doped fiber amplifier, er-doped
One end of fiber amplifier connects No.1 bragg grating, and the other end of erbium-doped fiber amplifier connects optical fiber total reflective mirror,
Adjustable optical attenuator, an input of fiber coupler are also set up between erbium-doped fiber amplifier and No.1 bragg grating
Arm is connect with adjustable optical attenuator, and a coupling arm is connect with wavelength division multiplexer, another input arm of fiber coupler passes through
Micrometer structure optical fiber probe module is connected to No. two bragg gratings, another coupling arm is connected to spectroanalysis instrument, light
Spectrum analysis instrument is used to detect the wavelength and changed power situation of dual-wavelength laser output；Micrometer structure optical fiber probe module is by solution
And the biconial micrometer structure optical fiber impregnated in the solution forms.
Further, the reflectivity of optical fiber total reflective mirror is 100%, and the splitting ratio of fiber coupler is 50:50.
Further, biconial micrometer structure optical fiber is that two conical transition zones clip one section of very thin cone lumbar region domain, is bored
The diameter in lumbar region domain is 5~15 μm, and cone lumbar region length of field is 5~15mm, and the both ends of biconial micrometer structure optical fiber are all connected with mark
Quasi-monomode fiber.Biconial micrometer structure optical fiber is made of flame fused biconical taper method.
Further, pumping source is 980nm pumping source, and wavelength division multiplexer is that the light partial wave of wavelength 980nm and 1550nm close
Wave, the central wavelength of No.1 bragg grating are 1550nm, and the central wavelength of No. two bragg gratings is 1551nm,
Adjustable optical attenuator is used to adjust the output power of 1550nm wavelength laser, makes the function of the output power Yu 1551nm wavelength laser
The absolute value differences of rate are within the scope of 1dBm.
Further, the amplification coefficient of Er-doped fiber is 10dB/m, and length is 8~12m.
In presently preferred embodiments of the present invention, referring to Fig. 1, dual wavelength gain competition apparatus for measuring refractive index is included at least：
980nm pumping source 7 is connected to Er-doped fiber 5 by wavelength division multiplexer 4, and No.1 bragg grating 1 and optical fiber total reflective mirror 6 connect
The both ends for being connected to above structure constitute a laser resonator；Adjustable optical attenuator 2 is embedded in No.1 bragg grating 1 and wave
Between division multiplexer 4, an input arm of fiber coupler 3 and a coupling arm are connected to adjustable optical attenuator 2 and wave
Between division multiplexer 4, another input terminal of fiber coupler is connected to No. two Bradleys by micrometer structure optical fiber probe module 9
Lattice fiber grating 8, another output are connected to spectroanalysis instrument 10.Referring to fig. 2, micrometer structure optical fiber probe module 9 includes：
The biconial micrometer structure optical fiber 11 being immersed in solution 12, biconial micrometer structure optical fiber are by flame fused biconical taper method
Manufactured, gained biconial micrometer structure optical fiber both ends connect standard single-mode fiber, and centre is that two conical transition zones clip one
The very thin cone lumbar region domain of section, cone waist diameter are 5~15 μm, and cone waist length is 5~15mm；The micrometer structure optical fiber probe module
The variation of solution refractive index can be sensed.
In the present embodiment, 980nm pumping source 7 is connected to Er-doped fiber 5 by wavelength division multiplexer 4 and constitutes Er-doped fiber
Amplifier；Wavelength division multiplexer 4 is the light partial wave multiplex of wavelength 980nm and 1550nm, and 5 amplification coefficient of Er-doped fiber is 10dB/m left
The right side, length is between 8~12m.Common erbium-doped fiber amplifier both ends are separately connected No.1 bragg grating 1 and optical fiber is complete
The laser resonator that anti-mirror 6 is constituted, to constitute an erbium doped fiber laser；The output wavelength of erbium doped fiber laser is
The central wavelength of No.1 bragg grating：1550nm or so, three dB bandwidth are 0.2nm or so；The reflection of optical fiber total reflective mirror 6
Rate is 100%.In the present embodiment, an input arm of fiber coupler 3 and a coupling arm are connected to adjustable light decay
Subtract between device 2 and the wavelength division multiplexer 4；Another input terminal of fiber coupler 3 passes through micrometer structure optical fiber probe module 9
No. two bragg gratings 8 are connected to, another output is connected to spectroanalysis instrument 10；No. two bragg gratings 8
Another laser resonator is constituted with optical fiber total reflective mirror 6, constitutes another Er-doped fiber with aforementioned erbium-doped fiber amplifier
Laser, laser output wavelength are the central wavelength of No. two bragg gratings：1551nm or so, three dB bandwidth are also 0.2nm
Left and right；Fig. 1 system structure entire so just constitutes the erbium doped fiber laser of a twin wavelength laser output, between the wavelength of dual wavelength
It is relatively close every being separated by.What needs to be explained here is that can be arranged between closer or slightly remote dual wavelength according to different measurement demands
Every range is between 1~2nm.Specifically, the splitting ratio of fiber coupler 3 is about 50:50 or so；Spectroanalysis instrument 10 is used for
Detect the wavelength and changed power situation of dual-wavelength laser output.In the present embodiment, adjustable optical attenuator 2 is embedded in No.1 Bradley
Between lattice fiber grating 1 and wavelength division multiplexer 4, the output power for adjusting 1550nm wavelength laser makes to swash with 1551nm wavelength
The power of light is in the level being not much different.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. a kind of dual wavelength gain competition apparatus for measuring refractive index, which is characterized in that including erbium-doped fiber amplifier, No.1 Bradley
Lattice fiber grating, optical fiber total reflective mirror, fiber coupler, No. two bragg gratings, micrometer structure optical fiber probe module, spectrum
Analyzer, pumping source are connected to Er-doped fiber by wavelength division multiplexer and constitute erbium-doped fiber amplifier, erbium-doped fiber amplifier
One end connect No.1 bragg grating, the other end of erbium-doped fiber amplifier connects optical fiber total reflective mirror, and Er-doped fiber is put
Adjustable optical attenuator, the input arm and tunable optical of fiber coupler are also set up between big device and No.1 bragg grating
Attenuator connection, a coupling arm are connect with wavelength division multiplexer, another input arm of fiber coupler passes through micrometer structure light
Fine detecting module is connected to No. two bragg gratings, another coupling arm is connected to spectroanalysis instrument, and spectroanalysis instrument is used
In the wavelength and changed power situation of detection dual-wavelength laser output；Micrometer structure optical fiber probe module is by solution and is immersed in molten
Biconial micrometer structure optical fiber composition in liquid.
2. dual wavelength gain competition apparatus for measuring refractive index according to claim 1, which is characterized in that optical fiber total reflective mirror
Reflectivity is 100%, and the splitting ratio of fiber coupler is 50:50.
3. dual wavelength gain competition apparatus for measuring refractive index according to claim 1 or 2, which is characterized in that biconial is micro-
Rice structured optical fiber is that two conical transition zones clip one section of very thin cone lumbar region domain, and the diameter in cone lumbar region domain is 5~15 μm, bores waist
Zone length is 5~15mm, and the both ends of biconial micrometer structure optical fiber are all connected with standard single-mode fiber.
4. dual wavelength gain competition apparatus for measuring refractive index according to claim 1 or 2, which is characterized in that pumping source is
980nm pumping source, wavelength division multiplexer is the light partial wave multiplex of wavelength 980nm and 1550nm, in No.1 bragg grating
Cardiac wave length is 1550nm, and the central wavelength of No. two bragg gratings is 1551nm, and adjustable optical attenuator is for adjusting
The output power of 1550nm wavelength laser makes the absolute value differences of the power of the output power and 1551nm wavelength laser in 1dBm
In range.
5. dual wavelength gain competition apparatus for measuring refractive index according to claim 4, which is characterized in that Er-doped fiber is put
Big coefficient is 10dB/m, and length is 8~12m.
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| CN201710338581.3A CN108872150A (en) | 2017-05-12 | 2017-05-12 | A kind of dual wavelength gain competition apparatus for measuring refractive index |
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| CN201710338581.3A CN108872150A (en) | 2017-05-12 | 2017-05-12 | A kind of dual wavelength gain competition apparatus for measuring refractive index |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113866132A (en) * | 2021-09-26 | 2021-12-31 | 岭南师范学院 | Multichannel SPR differential intensity modulation sensor |
| CN113866124A (en) * | 2021-09-26 | 2021-12-31 | 岭南师范学院 | SPR differential intensity modulation sensor |
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