CN101483315A - Optical fiber Brillouin laser for bi-directional dual wavelength lasing - Google Patents
Optical fiber Brillouin laser for bi-directional dual wavelength lasing Download PDFInfo
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- CN101483315A CN101483315A CNA2009100768706A CN200910076870A CN101483315A CN 101483315 A CN101483315 A CN 101483315A CN A2009100768706 A CNA2009100768706 A CN A2009100768706A CN 200910076870 A CN200910076870 A CN 200910076870A CN 101483315 A CN101483315 A CN 101483315A
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Abstract
The present invention relates to technical field of optical fiber sensing. The present invention provides a bi-directional dual wavelength simultaneous lasing brillouin fiber laser, wherein the laser comprises a first optical fiber 1, a lumped loss component 3, a second optical fiber 2 and a coupling device 4, wherein the coupling device 4 is provided with a first terminal port 5, a second terminal port 6, a third terminal port 7 and a fourth terminal port 8; all components constitute a mixed ring cavity; the two pieces of optical fiber are provided with different brillouin frequency excursion characteristic; two narrow line-width lasers with same wavelength are injected into the ring cavity by the first and second terminal port of the coupling device 4; two lasing brillouin Stokes waves are generated in clockwise and anti-clockwise direction respectively and output from the first and the second terminal port respectively so as to realize bi-directional lasing, and only one lasing wavelength in each lasing direction.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, particularly a kind of twocouese that is applied in optical fiber laser peg-top instrument and fiber optic temperature stress sensing, the simultaneously exciting optical fiber Brillouin laser of dual wavelength.
Background technology
Stimulated Brillouin scattering (Stimulated Brillouin Scattering, SBS) be a kind of optical nonlinearity process, when the pumping light power of incident reaches the threshold value that produces SBS, pumping wave produces sound wave by electrostriction, cause the periodic modulation of medium refraction index to form refractive-index grating, the Bragg diffraction effect of grating makes most input pumping light power will transfer the backscattering Stokes wave power that frequency reduces to, in this process, pumping wave, backscattering stokes wave and sound wave satisfy the conservation of energy and conservation of momentum condition, make that the frequency displacement of stokes wave is relevant with acoustic wave propagation velocity, because acoustic wave propagation velocity is variant in the different medium, the frequency displacement of stokes wave will change because of different medium dorsad.SBS has important application in fields such as Fibre Optical Sensor, fiber amplifier, acousto-optic interaction devices.
By optical fiber is placed in the resonant cavity, utilize the brillouin gain of optical fiber can constitute optical fiber Brillouin laser, it is low owing to threshold value, line width, gain direction sensitivity, stokes wave frequency displacement are widely used in fields such as super-narrow line width laser, microwave technology and optical fiber laser peg-top in characteristics such as microwave frequency magnitudes.
One of important application of optical fiber Brillouin laser is that (Brillouin Fiber Optical Gyroscope, BFOG), its principle schematic as shown in Figure 1 for the Brillouin fiber optic lasergyro.Optical fiber and fiber coupling device constitute optic fiber ring-shaped cavity.Two bundle narrow linewidth pumping lasers of same wavelength are from 1,2 two-port injection fibre annular chamber of fiber coupling device, respectively in the clockwise direction with counterclockwise produce the single mode Brillouin laser and swash and penetrate.Clockwise and counterclockwise Brillouin laser is exported from fiber coupling device 1,2 port respectively.When there is rotational angular velocity in Brillouin laser,, can produce frequency difference along two bundle laser clockwise and that propagate counterclockwise in the chamber based on Sagnac (Sagnac) effect.Can obtain the size of Brillouin laser angular speed by the frequency difference of measuring two bundle laser.One of major issue of restriction BFOG performance is to have " locking " phenomenon among the BFOG, promptly when angular speed during less than certain threshold value, clockwise with counterclockwise laser no longer can be by the size that measures angular speed of frequency difference because the frequency that intercouples becomes identical.Latch up effect makes the angular speed sensing of BFOG the dead band occur, and the scope of measurement is dwindled, and has reduced certainty of measurement.
The method of the elimination latch-up phenomenon that has proposed at present comprises: (1) is introduced mechanical shaking and is produced frequency offset elimination latch up effect; (2) two bundle pump lights are carried out shift frequency, make them possess different frequencies, thereby make the clockwise and counterclockwise Brillouin laser of generation have frequency offset, and then eliminate latch up effect; (3) adopt the pumping source of two different frequencies to realize the frequency offset of clockwise and counterclockwise Brillouin laser, and then eliminate latch up effect.Preceding two kinds of methods need optional equipments such as extra mechanical device or modulator, make the whole system complexity huge; The third method is high to the wavelength stability requirement of two pump light sources, has increased system cost greatly.
Summary of the invention
The purpose of this invention is to provide a kind of Wavelength stabilized, simple for structure compactness and lower-cost, as can the to eliminate latch-up phenomenon simultaneously exciting optical fiber Brillouin laser of twocouese, dual wavelength.
For achieving the above object, the optical fiber Brillouin laser of bi-directional dual wavelength lasing of the present invention comprises: first optical fiber 1, lump loss device 3, second optical fiber 2, coupling device 4, described coupling device 4 has first port 5, second port, 6, the three ports, 7, the four ports 8; Wherein, an end of described first optical fiber is connected with described the 4th port (8), and its other end is connected with an end of described lump loss device (3); One end of described second optical fiber is connected with the 3rd port (7), and its other end is connected with the other end of described lump loss device (3), to constitute an annular chamber.
Further, described first optical fiber 1 has different Brillouin shift characteristics with second optical fiber 2;
Further, L
1/ L
2≈ g
2/ g
1, wherein, L
1, L
2Be respectively the length of first optical fiber 1 and second optical fiber 2, g
1, g
2Be respectively the peak value brillouin gain coefficient of first optical fiber 1 and second optical fiber 2;
Further, at first enter second optical fiber 2, behind lump loss device 3, enter first optical fiber 1, swash the clockwise propagation Brillouin stokes wave of penetrating by 5 outputs of first port by the pump light of first port, 5 incidents of described coupling device; Pump light by second port, 6 incidents of described coupling device at first enters first optical fiber 1, enters second optical fiber 2 behind lump loss device 3, swashs the counterclockwise propagation Brillouin stokes wave of penetrating by 6 outputs of second port;
Further, the pump light of described first port, 5 incidents by described coupling device has identical wavelength with the pump light of described second port, 6 incidents by described coupling device;
Further, described sharp Brillouin's stokes wave of penetrating by first port 5 and 6 outputs of second port has different Stokes shift amounts.
Compared with prior art, advantage of the present invention is to adopt the pump light of a pumping wavelength can realize twocouese, the Brillouin laser of dual wavelength swashs to be penetrated, and need not complicated additional optics or mechanical device, therefore have simple in structurely, stable performance is convenient to realize, low cost and other advantages has important use to be worth at optical fiber laser peg-top instrument and fiber optic temperature stress sensing field.
Description of drawings
The Brillouin fiber optic lasergyro structural representation of Fig. 1 prior art;
Fig. 2 is the structural representation of the Brillouin laser of bi-directional dual wavelength lasing of the present invention;
Fig. 3 is that the pump light of the embodiment of the invention injects general single mode fiber in the hybrid chambers by port 6 and swashs the stokes wave penetrated and the measurement result of pumping wave beat frequency;
Fig. 4 is that the pump light of the embodiment of the invention injects TrueWave optical fiber in the hybrid chambers by port 5 and swashs the stokes wave penetrated and the measurement result of pumping wave beat frequency;
Brillouin laser swashed the stokes wave of two wavelength penetrating and the measurement result of pumping wave beat frequency when Fig. 5 was the two directional pump of the embodiment of the invention;
Brillouin laser swashed the measurement result of the beat frequency between the stokes wave of two wavelength penetrating when Fig. 6 was the two directional pump of the embodiment of the invention.
Embodiment
Core concept of the present invention is: adopt two sections optical fiber with different Brillouin shift characteristics to constitute the hybrid loop chamber, inject the pump light of same wavelength simultaneously at the twocouese in hybrid loop chamber, the Brillouin's stokes wave that makes two sections optical fiber produce swashs respectively in two directions to be penetrated, thereby the realization twocouese, the Brillouin laser output of dual wavelength.
The optical fiber Brillouin laser of the bi-directional dual wavelength lasing that the present invention proposes is described as follows in conjunction with the accompanying drawings and embodiments.
As shown in Figure 2, the optical fiber Brillouin laser of bi-directional dual wavelength lasing of the present invention comprises: first optical fiber 1, lump loss device 3, second optical fiber 2, coupling device 4, described coupling device 4 has first port 5, second port, 6, the three ports, 7, the four ports 8; Wherein, an end of described first optical fiber is connected with described the 4th port (8), and its other end is connected with an end of described lump loss device (3); One end of described second optical fiber is connected with the 3rd port (7), and its other end is connected with the other end of described lump loss device (3), to constitute a hybrid loop cavity configuration.
Wherein, described first optical fiber 1 and second optical fiber 2 can be any quartzy monomode fiber, chalcogenide glass monomode fiber, fluoride monomode fiber or polymer monomode fiber; Described lump loss device can be any device that can introduce the lump loss, the optical fiber of the bending that its entity can be melting welding point, the active joint with active joint loss with the loss of melting welding point, have bending loss of optical fiber or have the optical fibre device of lump optical fibre device loss; Described coupling device comprises various optical fiber coupling devices and based on the coupled apparatus of bulk optics material and the fiber coupling device that is made of some above devices, increases Dare interferometer etc. such as fiber coupler, the optical fiber mach that is made of two fiber couplers.
Further, described first optical fiber 1 has the different amount of Stokes shift dorsad (being the Brillouin shift amount) with second optical fiber 2, is expressed as f respectively
1And f
2Two sections optical fiber have different peak value brillouin gain coefficients, are expressed as g respectively
1And g
2The length of two sections optical fiber is respectively L
1And L
2The length of two sections optical fiber satisfies L
1/ L
2≈ g
2/ g
1, make under identical pump power two sections optical fiber the peak value brillouin gain about equally.
In the specific implementation process, as shown in Figure 2, the narrow linewidth Brillouin laser of the same wavelength of two bundles injects annular chamber by ring cavity coupling device first port 5 and second port 6, producing the sharp Brillouin's stokes wave penetrated of two bundles with counter clockwise direction clockwise respectively, and exporting from first port 5 and second port 6 of coupling device respectively.
More specifically, if the lump loss value of lump loss device 3 is big to the pumping light power level that obviously can influence by two sections optical fiber, at first enter second optical fiber 2 from the pump light of first port, 5 incidents of coupling device 4, behind lump loss device 3, enter first optical fiber 1 then, therefore, the pumping light power that passes through in second optical fiber 2 is better than the pumping light power in first optical fiber 1; Because the brillouin gain G ∝ gLP in the optical fiber, wherein g is the peak value brillouin gain of optical fiber, and L is a fiber lengths, and P is a pump power.By L
1/ L
2≈ g
2/ g
1, can obtain: the gain size of two sections optical fiber is determined by pump power in this case.Therefore, can take the lead in encouraging the stokes wave of second optical fiber, 2 correspondences to swash from the pump light of first port, 5 incidents of coupling device 4 and penetrate, the formation frequency displacement is f
2Clockwise propagated laser.In like manner, at first enter optical fiber 1, go into optical fiber 2 through lump loss device 3 is laggard then from the pump light of coupling device second port 6 incidents.Therefore, the pumping light power that passes through in first optical fiber 1 is better than the pumping light power in first optical fiber 1, can take the lead in having encouraged sharp the penetrating of stokes wave of first optical fiber, 1 correspondence, and the formation frequency displacement is f
1Counterclockwise propagated laser.The twocouese of having realized laser thus swashs to be penetrated, and each swashs and penetrate the stokes wave that a wavelength is only arranged on the direction and swash and penetrate, and its frequency shift amount is the Brillouin shift of corresponding first optical fiber 1 and second optical fiber 2 respectively.
More specifically, if the lump loss value of lump loss device 3 is little of the pumping light power level that can not obviously influence by two sections optical fiber, even be zero, at first enter second optical fiber 2 from the pump light of first port, 5 incidents of coupling device 4, behind lump loss device 3, enter first optical fiber 1 then.Because the loss value of lump loss device 3 is very little even be zero, the pumping light power that passes through in the pumping light power that passes through in second optical fiber 2 and first optical fiber 1 is similar to consistent.Because the brillouin gain G ∝ gLP in optical fiber, wherein g is the peak value brillouin gain of optical fiber, and L is a fiber lengths, and P is a pump power.Therefore, the magnitude relationship of the brillouin gain in first optical fiber 1 and second optical fiber 2 is by the length of two sections optical fiber and the product decision of peak value brillouin gain.Can suppose g
1L
1＜g
2L
2, then can take the lead in encouraging the stokes wave of second optical fiber, 2 correspondences to swash and penetrate from the pump light of first port, 5 incidents of coupling device 4, forming frequency displacement is the clockwise propagated laser of f2.At first enter first optical fiber 1 from the pump light of second port, 6 incidents of coupling device 4, behind lump loss device 3, enter second optical fiber 2 then.Because the loss value of lump loss device is very little even be zero, the pumping light power that passes through in the pumping light power that passes through in first optical fiber 1 and second optical fiber 2 is similar to consistent.In like manner, the magnitude relationship of brillouin gain is by the length of two sections optical fiber and the product decision of peak value brillouin gain, because g in first optical fiber 1 and second optical fiber 2
1L
1＜g
2L
2, still there is the pump light of second port, 6 incidents of coupling device 4 can take the lead in having encouraged the stokes wave of second optical fiber, 2 correspondences to swash and penetrates, the formation frequency displacement is f
2Counterclockwise propagated laser.Different with the front is, along with pumping light power increases, the stokes wave of first optical fiber, 1 correspondence also can take place to swash to be penetrated, and the formation frequency displacement is f
1Counterclockwise propagated laser, simultaneously a large amount of pump lights that consume reduce the pumping light power that enters second optical fiber 2, and then to make frequency displacement be f
2Counterclockwise laser extinguish.Realized sharp the penetrating of twocouese of laser thus, and each sharp penetrating only there is an excitation wavelength on the direction.
Wherein, the change of optical fiber kind, ambient temperature and the suffered stress of optical fiber that the sharp radio frequency rate of the optical fiber Brillouin laser of bi-directional dual wavelength lasing of the present invention on clockwise and counterclockwise both direction can be by first optical fiber 1 and second optical fiber 2 changes.
Particularly, described laser swashs the Brillouin shift that described first and second optical fiber are depended in the Brillouin laser frequency displacement of penetrating respectively on clockwise and counterclockwise both direction.The Brillouin shift of optical fiber is by the kind decision of optical fiber.Because the Brillouin shift excursion of optical fiber of the same race is not generally in 9GHz～11GHz, the laser frequency difference (f of generation
1-f
2) order magnitude range at MHz～GHz; On the other hand, optical fiber Brillouin frequency displacement meeting is subjected to ambient temperature and the suffered stress influence of optical fiber, and this adjustment for the laser frequency difference provides possible means, also for utilizing this laser to realize that temperature and stress sensing provide possibility.
In addition, be aided with ripe optic fiber ring-shaped cavity stabilization technique, in optic fiber ring-shaped cavity, introduce by the long device of signal of telecommunication control chamber, as be subjected to optical fiber that piezoelectric ceramic stretches etc., and provide the feedback signal of the long control in chamber by detecting the output laser power, the chamber of realizing optic fiber ring-shaped cavity is long stable, and this laser can be clockwise and realize that counterclockwise the single longitudinal mode lasers of different sharp radio frequency rates export on the both direction respectively, utilizes their beat signal can realize the disappearing BFOG of locking.
Specific embodiment of various details.
The hybrid resonant cavity configuration of the laser of present embodiment as shown in Figure 2, that first optical fiber 1 is chosen is general single mode fiber (Single Mode Fiber, SMF), that second optical fiber 2 is chosen is TrueWave optical fiber (TWF), and the Brillouin shift amount and the fiber lengths parameter of these two kinds of optical fiber are as shown in table 1; Coupling device is chosen the optical fiber mach that is made of two fiber couplers and is increased the Dare interferometer; Lump loss device is the melting welding point of two sections optical fiber.
Table 1
Can carry out tuning semiconductor distributed feedback laser by the pump light of the first and second port incidents of coupling device by wavelength in 1548nm～1550nm scope and produce, live width is 4.5MHz.Pump light is divided into two bundles after erbium-doped fiber amplifier (EDFA) amplifies, injected the hybrid loop chamber of present embodiment respectively by the port 5 and 6 of coupling device 4.Start from scratch and strengthen the pumping light power that port 6 injects, can observe the counterclockwise stokes wave that produces among the SMF and at first swash and penetrate, and keep swashing the state of penetrating along with pumping light power increases.Start from scratch and strengthen the pumping light power that port 5 injects, can observe the clockwise stokes wave that produces among the SMF also at first swashs and penetrates, but along with pumping light power is increased to a particular value, the clockwise stokes wave that produces among the TWF begins to swash to be penetrated, and sharp the penetrating of the clockwise stokes wave that produces among the SMF extinguished simultaneously.Under this state, bi-directional dual wavelength lasing has been realized in the hybrid loop chamber.The sharp of Brillouin's stokes wave that the pump light that port 6 and port 5 inject produces penetrated the result respectively as shown in Figure 3 and Figure 4.Fig. 3 and Fig. 4 illustrate that it is the Brillouin laser of 10.84GHz and 10.55GHz that two bundle pump lights produce frequency shift amount with clockwise direction respectively in the counterclockwise direction, and their the frequency shift amount Brillouin shift with SMF and TWF respectively is corresponding.Fig. 5 is the sharp result who penetrates of twocouese that two bundle pump lights inject hybrid chamber simultaneously.Fig. 6 is the beat frequency spectrum of the produced simultaneously Brillouin laser of twocouese, and the beat frequency result of about 300MHz between the clockwise and counterclockwise as can be seen from Figure sharp stokes light of penetrating has realized the optical fiber Brillouin laser of bi-directional dual wavelength lasing thus.
Need to prove that words such as " first " that relates to, " second " " 3rd ", " the 4th " only are used to make things convenient for illustrative purposes herein, it can not be interpreted as that order or primary and secondary limit.
Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1, a kind of optical fiber Brillouin laser of bi-directional dual wavelength lasing, it is characterized in that, comprise: first optical fiber (1), lump loss device (3), second optical fiber (2), coupling device (4), described coupling device (4) has first port (5), second port (6), the 3rd port (7), the 4th port (8); Wherein, one end of described first optical fiber is connected with described the 4th port (8), its other end is connected with an end of described lump loss device (3), one end of described second optical fiber is connected with the 3rd port (7), its other end is connected with the other end of described lump loss device (3), to constitute an annular chamber.
2, laser as claimed in claim 1 is characterized in that, described first optical fiber (1) has different Brillouin shift characteristics with second optical fiber (2).
3, laser as claimed in claim 2 is characterized in that, L
1/ L
2≈ g
2/ g
1, wherein, L
1, L
2Be respectively the length of first optical fiber (1) and second optical fiber (2), g
1, g
2Be respectively the peak value brillouin gain coefficient of first optical fiber (1) and second optical fiber (2).
4, laser as claimed in claim 1, it is characterized in that, pump light by first port (5) incident of described coupling device at first enters second optical fiber (2), behind lump loss device (3), enter first optical fiber (1), swash clockwise Brillouin's stokes wave of penetrating by first port (5) output; Pump light by second port (6) incident of described coupling device at first enters first optical fiber (1), enters second optical fiber (2) behind lump loss device (3), swashs counterclockwise Brillouin's stokes wave of penetrating by second port (6) output.
5, laser as claimed in claim 4 is characterized in that, the pump light of described first port (5) incident by described coupling device has identical wavelength with the pump light of described second port (6) incident by described coupling device.
6, laser as claimed in claim 4 is characterized in that, the described Brillouin shift that is respectively clockwise described second optical fiber (2) and first optical fiber (1) with the frequency displacement of counterclockwise Brillouin's stokes wave.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496846A (en) * | 2011-12-15 | 2012-06-13 | 杭州电子科技大学 | Adjustable double-wavelength optical fiber laser based on Brillouin scattering |
| CN103335967A (en) * | 2013-06-24 | 2013-10-02 | 南昌航空大学 | Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect |
| CN106202646A (en) * | 2016-06-29 | 2016-12-07 | 中国寰球工程公司 | A kind of method that the PDMS of utilization data source automatically generates instrument disposition figure |
| CN106525020A (en) * | 2015-09-09 | 2017-03-22 | 霍尼韦尔国际公司 | Single-pump cascaded stimulated brillouin scattering (sbs) ring laser gyro |
| CN110048303A (en) * | 2019-03-18 | 2019-07-23 | 深圳市速腾聚创科技有限公司 | A kind of laser and Optical Maser System |
-
2009
- 2009-01-23 CN CN2009100768706A patent/CN101483315B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496846A (en) * | 2011-12-15 | 2012-06-13 | 杭州电子科技大学 | Adjustable double-wavelength optical fiber laser based on Brillouin scattering |
| CN103335967A (en) * | 2013-06-24 | 2013-10-02 | 南昌航空大学 | Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect |
| CN103335967B (en) * | 2013-06-24 | 2015-03-04 | 南昌航空大学 | Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect |
| CN106525020A (en) * | 2015-09-09 | 2017-03-22 | 霍尼韦尔国际公司 | Single-pump cascaded stimulated brillouin scattering (sbs) ring laser gyro |
| CN106202646A (en) * | 2016-06-29 | 2016-12-07 | 中国寰球工程公司 | A kind of method that the PDMS of utilization data source automatically generates instrument disposition figure |
| CN110048303A (en) * | 2019-03-18 | 2019-07-23 | 深圳市速腾聚创科技有限公司 | A kind of laser and Optical Maser System |
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