CN105006739A - Brillouin scattering dynamic grating generation device and method based on capillary tube - Google Patents
Brillouin scattering dynamic grating generation device and method based on capillary tube Download PDFInfo
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- CN105006739A CN105006739A CN201510420967.XA CN201510420967A CN105006739A CN 105006739 A CN105006739 A CN 105006739A CN 201510420967 A CN201510420967 A CN 201510420967A CN 105006739 A CN105006739 A CN 105006739A
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Abstract
The invention discloses a Brillouin scattering dynamic grating generation device and a method based on a capillary tube. Laser is generated by a laser, two channels of beam signals are divided via a coupler from the laser, one beam generates back Brillouin scattering in a non-linear optical fiber, frequency shifting of a microwave signal source is performed via the other beam, the frequency difference of the two beams of optical path signals is the optical fiber Brillouin frequency shift, and Brillouin dynamic gratings are excited in the non-linear optical fiber; and the non-linear optical fiber is the capillary tube whose inner part is filled with refraction inner cores. According to the Brillouin scattering dynamic grating generation device and the method based on the capillary tube, the inner part of the capillary tube is filled with certain media to manufacture the non-linear optical fiber, the characteristic of the Brillouin dynamic gratings is adjusted via the control of the wavelength and power of a main laser and the frequency of the microwave signal source, dynamic gratings with the tunable grating characteristic are obtained, the electromagnetic interference is greatly reduced, and the device is advantaged by small size, high precision, low cost, and simple structure.
Description
Technical field
The present invention relates to a kind of grating generation device and method, be specifically related to a kind of Brillouin scattering dynamic raster generation device and method.
Background technology
Spectral signal measurement is measurement means the most frequently used in optical measurement and testing process, is widely used in the fields such as optical communication, national defence, Aero-Space, environmental protection and material.Fiber grating must be utilized to carry out choosing of signal in spectral signal is measured, in the parameter measured, Measurement Resolution is the topmost technical indicator of spectral measurement.Owing to being subject to grating indentation density and the isoparametric restriction of light beam aperture, make spectrometer resolution based on traditional raster only up to several pm; Compare conventional grating spectrometer, though scanning Fabry-Perot interferometer can provide high light spectral resolution, its wavelength measurement scope and spectral resolution are conflict parameters, cannot obtain higher spectral resolution in wide wave-length coverage situation.In recent years, the resolution of conventional spectrometers can not meet the growth requirement of new technology gradually, becomes a large bottleneck of emerging field development.The resolution of the application demand newly emerged to existing spectrometer proposes challenge, therefore explores novel spectrum analysis mechanism, and development super-resolution spectral measurement methods has just become a kind of inexorable trend and problem in the urgent need to address at present.
In recent years, Brillouin's dynamic raster in optical fiber advantage that full light produces because having, parameter is controlled flexibly, be widely studied and be applied to all-optical signal processing, Fibre Optical Sensor, Microwave photonics, optical storage and optic fibre characteristic sign etc., caused the great attention of researcher.The patent of invention that the researcher such as Dong Yongkang proposes is based on the spectral analysis device of Brillouin's dynamic raster and analytical method thereof, and application number 201310231671.4, utilizes general single mode fiber to produce Brillouin's dynamic raster and carry out spectrum analysis; The patent of invention that the researcher such as Dong Yongkang proposes is based on the microwave photon filter of stimulated Brillouin scattering dynamic raster and filtering method thereof, and application number 201310233987.7, utilizes polarization maintaining optical fibre to produce Brillouin's dynamic raster and carry out microwave photon filter design.At present, they utilize general single mode fiber or polarization maintaining optical fibre to produce Brillouin's dynamic raster, the research and development of these Brillouin's dynamic rasters are all concentrate on unswept pumping light to produce fixed grating, therefore, its reflection wavelength is also fixing, limits the application in high-resolution spectroscopy technology.In recent years, under the promotion of laser technology, electronic technology and novel photoelectric-detection element development, spectral resolution and dynamic range all improve several order of magnitude, therefore, are difficult to meet these new challenges utilizing Brillouin's dynamic raster of general single mode fiber or guarantor's oblique presentation life.
Summary of the invention
Goal of the invention: the object of the invention is to for the deficiencies in the prior art, a kind of Brillouin scattering dynamic raster generation device based on capillary and method are provided, high-quality Brillouin's dynamic raster can not only be produced, and the parameters such as the tunable dynamic raster pitch of high accuracy can be obtained.
Technical scheme: the invention provides a kind of Brillouin scattering dynamic raster generation device based on capillary, comprise two light paths, article one, light path is the laser, coupler, amplifier, the first Polarization Controller and the nonlinear optical fiber that connect successively, another connects the second Polarization Controller successively from described coupler, modulator, polarization beam combiner finally get back to nonlinear optical fiber, also comprise isochronous controller, described isochronous controller is connected described modulator by microwave signal source while being connected with laser; Described nonlinear optical fiber take capillary as the optical fiber of carrier, and described capillary inside is filled with refraction inner core.
Because Brillouin's dynamic raster is the refractive-index grating excited by relevant acoustic wavefield in essence, generally pump light 1 and pump light 2, its difference on the frequency equals optical fiber Brillouin frequency displacement and with identical polarization state (x-polarisation) from optical fiber two ends injection fibre, inspire relevant acoustic wavefield by stimulated Brillouin scattering effect, form Brillouin's dynamic raster.Two light paths of the present invention are just for generation of two-way pump light, and generation is stablized and tunable Brillouin's dynamic raster in non-linear light.
Further, described capillary medium is quartz capillary, can strengthen the nonlinear characteristic of capillary, produces stronger Brillouin scattering effect.
Further, described refraction inner core is one or more in carbon tetrachloride, carbon disulfide and Graphene, by changing the refractive index of kind in medium and proportional control mixed liquor, thus can realize the single mode transport of liquid-core optical fibre.
Further, the inside diameter ranges of described capillary is 2 ~ 10 μm.
Further, also comprise the detecting laser be connected with polarization beam combiner, detectable signal light, with y-polarisation state injection fibre, just can be reflected to form reflected signal by Brillouin's dynamic raster.
A kind of Brillouin scattering dynamic raster production method based on capillary, laser produces laser and separates two-way beam signal through coupler, wherein a road is amplified in the first Polarization Controller through amplifier, the light beam exported from the first Polarization Controller injects nonlinear optical fiber, produces Brillouin scattering dorsad in nonlinear optical fiber; Another road beam signal separated from coupler enters modulator through the second Polarization Controller, output beam after modulated enters in nonlinear optical fiber through polarization beam combiner, microwave signal source carries out shift frequency to the light beam in modulator, make the frequency phase-difference optical fiber Brillouin frequency displacement size of two-beam road signal, the synchronizing signal that isochronous controller exports gives laser and modulator respectively, both guarantees signal is synchronous, excites Brillouin's dynamic raster in nonlinear optical fiber; Described nonlinear optical fiber is the capillary drawn by precast body, and reflect inner core by femtosecond micro-processing technology its inner filling of capillary, two ends monomode fiber is welding together.
Preferably, described laser is tunable single frequency laser, and described amplifier is the humorous Erbium-Doped Fiber Amplifier of power adjustable.
Further, the pitch of described Brillouin's dynamic raster realizes by regulating the frequency of the wavelength of laser, power and microwave signal source.
Beneficial effect: a kind of Brillouin scattering dynamic raster generation device based on capillary that the present invention proposes and method, fill certain medium in capillary inside and make nonlinear optical fiber, regulated the characteristic of Brillouin's dynamic raster by the frequency controlling the wavelength of main laser, power and microwave signal source; Concrete, formula Λ=λ/(2n) of Brillouin's dynamic raster, wherein Λ is the pitch of Brillouin's dynamic raster, λ is pump wavelength, n is medium refraction index, by the pitch Λ regulating pump wavelength λ just can change grating, thus change the reflection wavelength of grating, realize the measurement of spectrum; According to Brillouin shift formula ν
b=2nV/ λ, wherein ν
bbe Brillouin shift, n is medium refraction index, and V is the velocity of sound in medium, and λ is pump wavelength, can find out, the Brillouin shift ν of optical fiber
bbe inversely proportional to pump wavelength λ; Therefore, the present invention can not only produce Brillouin's dynamic raster, and can obtain the dynamic raster of adjustable grating characteristic, greatly reduces electromagnetic interference simultaneously, and has that volume is little, precision is high, the with low cost and simple advantage of structure.
Accompanying drawing explanation
Fig. 1 is the structural schematic block diagram of apparatus of the present invention;
Fig. 2 is exciting and detecting schematic diagram of Brillouin's dynamic raster of the present invention.
Embodiment
Below technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment:
Embodiment 1: a kind of device produced based on capillary Brillouin scattering dynamic raster, as shown in Figure 1, comprise two light paths, article one, light path is the narrow line width regulatable laser 201, coupler 202, Erbium-Doped Fiber Amplifier 203, first Polarization Controller 204 and the nonlinear optical fiber 205 that connect successively, and another connects the second Polarization Controller 208 successively from coupler 202s, photoline electrooptic modulator 209, polarization beam combiner 210 get back to nonlinear optical fiber 205.Isochronous controller 206 one end connects narrow line width regulatable laser 201, and the other end connects photoline electrooptic modulator 209 by microwave signal source 207.Detecting laser 211 is connected with polarization beam combiner 210.
Concrete, nonlinear optical fiber 205 in the present embodiment is formed by precast body drawing by accurate quartz capillary, the purity of its quartz sand is about 99.999%, and the external diameter of capillary is 120 μm, internal diameter 10 μm, length is 10m, reflect inner core by femtosecond micro-processing technology its inner filling of capillary, two ends monomode fiber is welding together, and forms the high non-linearity low-birefringence liquid-core optical fibre of stabilized structure, wherein, reflecting inner core is carbon tetrachloride.
The grating production method of said apparatus is, it is 1550nm that narrow line width regulatable laser 201 arranges output wavelength, power is 5dBm, its light exported separates two paths of signals through coupler 202, wherein the light of 50% exports the input entering Erbium-Doped Fiber Amplifier 203 from a port, peak power output 30dBm, arrange and export as 25dBm, signal after being amplified by Erbium-Doped Fiber Amplifier 203 enters into nonlinear optical fiber 205 through the first Polarization Controller 204, produces brillouin scattering signal dorsad in nonlinear optical fiber 205; The signal of the output through another road 50% that coupler 202 separates enters into photoline electrooptic modulator 209 through the second Polarization Controller 208, and modulated signal enters in nonlinear optical fiber 205 through polarization beam combiner 210 and produces Brillouin's dynamic raster.Because Brillouin's dynamic raster is the refractive-index grating excited by relevant acoustic wavefield in essence, generally pump light 1 and pump light 2, its difference on the frequency equals Brillouin shift with identical polarization state (x-polarisation) from optical fiber two ends injection fibre, relevant acoustic wavefield is inspired by stimulated Brillouin scattering effect, form Brillouin's dynamic raster, detectable signal light, with y-polarisation state injection fibre, just can be reflected to form reflected signal by Brillouin's dynamic raster.As shown in Figure 2, pump light 1 signal in the present embodiment is the signal entered in Erbium-Doped Fiber Amplifier 203 separated through coupler 202 by tunable laser 201, pump light 2 signal to be separated through coupler 202 by tunable laser 201 to enter the second Polarization Controller 208, signal again after electrooptic modulator 209 shift frequency, because nonlinear optical fiber 205 is 10.91GHz at the Brillouin shift of 1550nm pump signal, so the frequency first arranging microwave signal source 207 is 10.91GHz, and do certain fine setting, make the frequency 10.91GHz being less than pump light 1 signal from the signal frequency of pump light 2, the microwave signal that microwave signal source 207 produces drives electrooptic modulator 209, the control signal that isochronous controller 206 produces drives tunable laser 201 and microwave signal source 207, and isochronous controller 206 is set to inter-sync, Brillouin's dynamic raster is produced like this in nonlinear optical fiber 205.By regulating the pumping wavelength of tunable laser 201 and the frequency of microwave signal source 207, can obtain the dynamic raster of tunable pitch, compared to the dynamic raster technology having fixed railing distance at present, this invention can obtain the dynamic raster of tunable pitch.If the flashlight utilizing detecting laser 211 to send enters in nonlinear optical fiber 205 through polarization beam combiner 210 and scans, the Brillouin's dynamic raster efficiently excited just can be obtained all the time.
Embodiment 2: identical with embodiment 1 device, difference is: the external diameter of the carrier capillary of the nonlinear optical fiber 205 of the present embodiment is 110 μm, internal diameter 6 μm, length is 8m, by femtosecond micro-processing technology at capillary its inner carbon tetrachloride of packing volume 50:50 and mixing material of carbon disulfide.Nonlinear optical fiber 205 is 11.21GHz at the Brillouin shift of 1550nm pump signal, so the frequency first arranging microwave signal source 207 is 11.21GHz, and do certain fine setting, make pump light 2 11.21GHz less of the signal frequency of pump light 1, the dynamic raster of tunable pitch can be obtained so equally.
Embodiment 3: identical with embodiment 1 device, difference is: the external diameter of the carrier capillary of the nonlinear optical fiber 205 of the present embodiment is 95 μm, internal diameter 2 μm, and length is 5m, by femtosecond micro-processing technology at its inner packing volume Graphene of capillary.Nonlinear optical fiber 205 is 12.08GHz at the Brillouin shift of 1550nm pump signal, so the frequency first arranging microwave signal source 207 is 12.08GHz, and do certain fine setting, make pump light 2 12.08GHz less of the signal frequency of pump light 1, the dynamic raster of tunable pitch can be obtained so equally.
Claims (10)
1. the Brillouin scattering dynamic raster generation device based on capillary, it is characterized in that: comprise two light paths, article one, light path is the laser, coupler, amplifier, the first Polarization Controller and the nonlinear optical fiber that connect successively, another connects the second Polarization Controller successively from described coupler, modulator, polarization beam combiner finally get back to nonlinear optical fiber, also comprise isochronous controller, described isochronous controller is connected described modulator by microwave signal source while being connected with laser; Described nonlinear optical fiber take capillary as the optical fiber of carrier, and described capillary inside is filled with refraction inner core.
2. the Brillouin scattering dynamic raster generation device based on capillary according to claim 1, is characterized in that: described capillary is quartz capillary.
3. the Brillouin scattering dynamic raster generation device based on capillary according to claim 1, is characterized in that: described refraction inner core is one or more in carbon tetrachloride, carbon disulfide and Graphene.
4. the Brillouin scattering dynamic raster generation device based on capillary according to claim 1 and 2, is characterized in that: the inside diameter ranges of described capillary is 2 ~ 10 μm.
5. the Brillouin scattering dynamic raster generation device based on capillary according to claim 1, is characterized in that: also comprise the detecting laser be connected with polarization beam combiner.
6. the Brillouin scattering dynamic raster production method based on capillary, it is characterized in that: laser produces laser and separates two-way beam signal through coupler, wherein a road is amplified in the first Polarization Controller through amplifier, the light beam exported from the first Polarization Controller injects nonlinear optical fiber, produces Brillouin scattering dorsad in nonlinear optical fiber; Another road beam signal separated from coupler enters modulator through the second Polarization Controller, output beam after modulated enters in nonlinear optical fiber through polarization beam combiner, microwave signal source carries out shift frequency to the light beam in modulator, make the frequency phase-difference optical fiber Brillouin frequency displacement size of two-beam road signal, the synchronizing signal that isochronous controller exports gives laser and modulator respectively, both guarantees signal is synchronous, excites Brillouin's dynamic raster in nonlinear optical fiber; Described nonlinear optical fiber is the capillary drawn by precast body, and reflect inner core by femtosecond micro-processing technology its inner filling of capillary, two ends monomode fiber is welding together.
7. the Brillouin scattering dynamic raster production method based on capillary according to claim 6, is characterized in that: described capillary is quartz capillary.
8. the Brillouin scattering dynamic raster production method based on capillary according to claim 6, is characterized in that: described refraction inner core is one or several the mixture in carbon tetrachloride, carbon disulfide and Graphene.
9. the Brillouin scattering dynamic raster production method based on capillary according to claim 6, is characterized in that: described laser is tunable single frequency laser, and described amplifier is the humorous Erbium-Doped Fiber Amplifier of power adjustable.
10. the Brillouin scattering dynamic raster production method based on capillary according to claim 6, is characterized in that: the pitch of described Brillouin's dynamic raster realizes by regulating the frequency of the wavelength of laser, power and microwave signal source.
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| CN105811225A (en) * | 2016-05-24 | 2016-07-27 | 盐城工学院 | Microwave signal generating device and method of photoelectric oscillator based on liquid-core optical fiber Brillouin scattering effect |
| CN106602394A (en) * | 2017-01-19 | 2017-04-26 | 吉林大学 | Resonant cavity system formed by dynamic fiber grating and fiber bragg grating |
| CN111190010A (en) * | 2020-01-15 | 2020-05-22 | 电子科技大学 | Micro-flow biochemical sensor in Brillouin optical machine cavity |
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| CN111190010A (en) * | 2020-01-15 | 2020-05-22 | 电子科技大学 | Micro-flow biochemical sensor in Brillouin optical machine cavity |
| CN111190010B (en) * | 2020-01-15 | 2022-05-03 | 电子科技大学 | Brillouin optical machine intracavity microflow biochemical sensor |
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