CN103956640B - A kind of switchable optical fiber laser of wavelength based on Graphene and core shift structure - Google Patents
A kind of switchable optical fiber laser of wavelength based on Graphene and core shift structure Download PDFInfo
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- CN103956640B CN103956640B CN201410212880.9A CN201410212880A CN103956640B CN 103956640 B CN103956640 B CN 103956640B CN 201410212880 A CN201410212880 A CN 201410212880A CN 103956640 B CN103956640 B CN 103956640B
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Abstract
A kind of switchable optical fiber laser of wavelength based on Graphene and core shift structure, by pumping source, wavelength division multiplexer, Er-doped fiber, capillary tube, Graphene, circulator, bragg grating, standard single-mode fiber core shift structure, variable optical attenuator and photo-coupler form and are connected in series composition loop resonances chamber by standard single-mode fiber, capillary tube is coated with the standard single-mode fiber of graphene solution equipped with end face, the outfan e of circulator is connected with bragg grating and standard single-mode fiber core shift structures in series successively, the outfan that outfan j is optical fiber laser of photo-coupler.The invention have the advantage that and Graphene is accessed in loop resonator cavity, can effectively suppress the mode competition effect that Er-doped fiber produces, and matching standard single-mode fiber core shift structure and Bragg grating realize, as the tuning of comb filter and variable optical attenuator, the stable output that single-double wave length is switchable；This optical fiber laser structure is simple, low cost, and techno-economic effect is notable.
Description
Technical field
The invention belongs to high speed optical fiber communication and laser technology field, a kind of based on Graphene and core shift structure
The switchable optical fiber laser of wavelength.
Background technology
Laser instrument is the focus of current speed fiber optic communication systems area research.Optical fiber laser to develop forward many
Functionalization, practical direction are developed.Due to mode competition effect stronger in laser instrument, it is difficult at room temperature obtain stable swashing
Light exports.There is a lot of method to overcome this difficult problem at present: such as put into by Er-doped fiber in liquid nitrogen and cool down, utilized height
The four-wave mixing effect of nonlinear optical fiber, strengthens polarisation hole-burning effect etc..Relative to traditional laser instrument, novel substance Graphene
With the optical characteristics that it is exclusive, can put into, as nonlinear dielectric, the mode competition suppressing erbium fine in loop resonances chamber, it is achieved
The stable output of laser, has the advantages that technique is the most with low cost.
The switchable optical fiber laser of wavelength has a wide range of applications in all many-sides.Such as wavelength-division multiplex system, optical fiber
Communication system, optical fiber sensing system, the computing of optical signal and the measurement of optics, particularly apply in current high speed WDM
The light source of network Wavelength routing.The means realizing the switchable optical fiber laser of wavelength have a lot, currently mainly have: the optical fiber of cascade
Bragg grating, multistage birefringence Sagnac fiber loop mirror, it is carved with the highly nonlinear optical fiber in Prague, is carved with the multimode in Prague
Optical fiber etc..
Summary of the invention
It is an object of the invention to realize the switchable optical fiber laser of wavelength of a kind of low cost, high stability.
Technical scheme:
A kind of switchable optical fiber laser of wavelength based on Graphene and core shift structure, by 980nm/1480nm pumping source, ripple
Division multiplexer, Er-doped fiber, capillary tube, Graphene, circulator, bragg grating, standard single-mode fiber core shift structure, can
Light attenuator and 10:90 photo-coupler form and are connected in series composition loop resonances chamber by standard single-mode fiber, and wavelength-division is multiple
Being respectively input a, outfan b and input c with the three of device ports, wherein input a is with 980nm/1480nm pumping source even
Connect；The a length of 3cm of capillary tube, a diameter of 126 μm, be coated with the standard list of graphene solution equipped with one section of end face in capillary tube
Mode fiber, this standard single-mode fiber diameter mates with capillary diameter；Three ports of circulator are respectively input d and output
End e, Ausgang, wherein input d with insertion capillary tube standard single-mode fiber be connected, outfan e successively with bragg fiber
Grating and standard single-mode fiber core shift structure are connected in series by standard single-mode fiber, and Ausgang is connected with variable optical attenuator；
Four ports of photo-coupler are respectively input g, input h, outfan i and outfan j, wherein input g with can darkening
The outfan of attenuator connects, and input h is connected with the outfan of standard single-mode fiber core shift structure, and outfan i is multiple with wavelength-division
Connecting with the input c of device, outfan j is the outfan of whole optical fiber laser.
The preparation method of described standard single-mode fiber core shift structure, step is as follows:
1) a segment standard single-mode fiber and interlude standard single-mode fiber are carried out core shift welding, discharge capacity 200 bit, partially
Core amount controls core shift distance less than 9 μm and by controlling the motor of heat sealing machine；
2) a length of 3-5cm of interlude standard single-mode fiber is intercepted；
3) the interlude standard single-mode fiber after the 3rd segment standard single-mode fiber and intercepting is carried out core shift welding again,
Discharge capacity 200 bit, core shift amount controls core shift distance less than 9 μm and by controlling the motor of heat sealing machine, can be prepared by
Standard single-mode fiber core shift structure.
The working mechanism of the present invention:
Graphene is a kind of novel substance material, has the nonlinear optical properties of uniqueness, and processing technology is simple；Compare with
Other nonlinear dielectrics such as cost such as photonic crystal fiber, dispersion shifted optical fiber is relatively low；It is applied in optical fiber laser it unique
Character can be substantially reduced cavity loss.Therefore, Graphene is that a kind of mode competition that can suppress Er-doped fiber produces steady
Determine the novel medium of laser output.Realizing on the basis of laser stably exports, by standard single-mode fiber structure in loop resonances chamber
The core shift structure become, according to principle of interference, can realize the generation of laser as a kind of comb filter.By core shift structure
First paragraph standard single-mode fiber and Bragg grating cascade, the comb spectrum formed for standard single-mode fiber core shift structure, can be by
Impact in Bragg grating produces a transmission peaks such that it is able to realize the output of Single wavelength.Variable optical attenuator is accessed
To loop resonances intracavity, originally arrange and decay to zero, due to the existence of core shift structure insertion loss, can only be at the middle cardiac wave of grating
Long positionObserve the generation of single laser；Regulation variable attenuator, when the insertion loss that loss produces more than core shift structure,
Single laser can only be observed in the passband of core shift structure；Additionally, work as loss and the core shift structure that variable attenuator produces
When insertion loss is equal, can exist simultaneouslyWithPlace observes the output of dual-wavelength laser.Therefore by changing variable light decay
Subtract device and control cavity loss, the switchable of single-double wave length can be realized.
Advantages of the present invention and providing the benefit that:
Graphene is linked in loop resonances chamber as a kind of novel non-linearity medium, can effectively suppress Er-doped fiber to produce
Raw mode competition effect, and matching standard single-mode fiber core shift structure is as comb filter generation Single wavelength laser, Bradley
The introducing of lattice grating is capable of the output of Single wavelength equally, and realizes single by variable optical attenuator to the regulation of cavity loss
The stable output that dual wavelength is switchable；This optical fiber laser structure is simple, low cost is easy to implement, and techno-economic effect is notable,
Be suitable to popularization and application.
Accompanying drawing explanation
Fig. 1 is this wavelength switchable optical fiber laser structure schematic diagram.
Fig. 2 is standard single-mode fiber core shift structure enlarged diagram.
In figure: 1.980nm/1480nm pumping source 2. wavelength division multiplexer 3. Er-doped fiber 4. capillary tube 5. Graphene
6. circulator 7. bragg grating 8. standard single-mode fiber core shift structure 9. variable optical attenuator 10.10:90
Photo-coupler 11. standard single-mode fiber.
Fig. 3 is the transfer function analogous diagram of standard single-mode fiber core shift structure and bragg grating cascade.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
Embodiment:
A kind of switchable optical fiber laser of wavelength based on Graphene and core shift structure, as it is shown in figure 1, by 980nm/
1480nm pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, capillary tube 4, Graphene 5, circulator 6, bragg grating 7, mark
Quasi-monomode fiber core shift structure 8, variable optical attenuator 9 and 10:90 photo-coupler 10 are formed and are connected by standard single-mode fiber
Connecting and composing loop resonances chamber, three ports of wavelength division multiplexer 2 are respectively input a, outfan b and input c, the most defeated
Enter to hold a with 980nm/1480nm pumping source 1 to be connected；The a length of 3cm of capillary tube 4, a diameter of 126 μm, equipped with one section in capillary tube 4
End face is coated with the standard single-mode fiber of Graphene 5 solution, this standard single-mode fiber diameter and capillary tube 4 diameter matches；Go in ring
Three ports of device 6 are respectively input d and outfan e, Ausgang, wherein input d and the standard list inserting capillary tube 4
Mode fiber connects, and outfan e passes through standard single mode light with bragg grating 7 and standard single-mode fiber core shift structure 8 successively
Fibre is connected in series, and Ausgang is connected with variable optical attenuator 9；Four ports of photo-coupler 10 are respectively input g, input
End h, outfan i and outfan j, wherein input g is connected with the outfan of variable optical attenuator 9, input h and standard single mode
The outfan of optical fiber core shift structure 8 connects, and outfan i is connected with the input c of wavelength division multiplexer 2, and outfan j is whole optical fiber
The outfan of laser instrument.
The preparation method of described standard single-mode fiber core shift structure, step is as follows:
1) a segment standard single-mode fiber and interlude standard single-mode fiber are carried out core shift welding, discharge capacity 200 bit, partially
Core amount controls core shift distance less than 9 μm and by controlling the motor of heat sealing machine；
2) a length of 3-5cm of interlude standard single-mode fiber is intercepted；
3) the interlude standard single-mode fiber after the 3rd segment standard single-mode fiber and intercepting is carried out core shift welding again,
Discharge capacity 200 bit, core shift amount controls core shift distance less than 9 μm and by controlling the motor of heat sealing machine, can be prepared by
Standard single-mode fiber core shift structure, as shown in Figure 2.
Fig. 3 is the transfer function analogous diagram of standard single-mode fiber core shift structure and bragg grating cascade, table in figure
Bright: the transmission spectrum of standard single-mode fiber core shift structure becomes to have periodic passband, after cascading with Bragg grating, passband occurs
The transmission paddy that one grating is formed.Simultaneously because the reflection in Prague, by another loop shape resonator cavity of circulator
There will be a reflection peak to offset with transmission paddy, the wave filter that therefore standard single-mode fiber core shift structure is formed is at Er-doped fiber
Maximum gain at there will be a Single wavelength laser.
The job analysis of this embodiment: pump light inputs Er-doped fiber 3 through the port b of wavelength division multiplexer 2 and obtained gain,
By Bragg grating 7 and standard single-mode fiber core shift structure 8 with after the regulation of variable optical attenuator 9, permissible
Realize Single wavelength, conversion between the output of dual-wavelength laser and wavelength.Light is by being coated with the standard single mode light of Graphene 5
After fibre, serve certain frequency stabilization effect, have and utilize stablizing of dual wavelength.These light are through the outfan i of 10:90 bonder 10
Return to wavelength division multiplexer 2, through outfan j Output of laser.The output introducing generation Single wavelength laser of Bragg grating 7, mark
The standard single-mode fiber core shift structure that quasi-monomode fiber 11 is fused into plays certain comb-filter effects, it is possible to realize Single wavelength
Output, variable optical attenuator with the use of, it is achieved that the output of the switchable laser of wavelength.
Claims (2)
1. the switchable optical fiber laser of wavelength based on Graphene and core shift structure, it is characterised in that: by 980nm/
1480nm pumping source, wavelength division multiplexer, Er-doped fiber, capillary tube, Graphene, circulator, bragg grating, standard single mode light
Fine core shift structure, variable optical attenuator and 10:90 photo-coupler form and connect and compose loop resonances by standard single-mode fiber
Chamber, three ports of wavelength division multiplexer are respectively input a, outfan b and input c, wherein input a and 980nm/
1480nm pumping source connects；The a length of 3cm of capillary tube, a diameter of 126 μm, be coated with Graphene equipped with one section of end face in capillary tube
The standard single-mode fiber of solution, this standard single-mode fiber diameter mates with capillary diameter；Three ports of circulator are respectively
Input d and outfan e, Ausgang, wherein input d is connected with the standard single-mode fiber inserting capillary tube, and outfan e depends on
Secondary be connected in series by standard single-mode fiber with bragg grating and standard single-mode fiber core shift structure, Ausgang with can
Light attenuator connects；Four ports of photo-coupler are respectively input g, input h, outfan i and outfan j, wherein
Input g is connected with the outfan of variable optical attenuator, and input h is connected with the outfan of standard single-mode fiber core shift structure,
Outfan i is connected with the input c of wavelength division multiplexer, and outfan j is the outfan of whole optical fiber laser.
The switchable optical fiber laser of wavelength based on Graphene and core shift structure the most according to claim 1, it is characterised in that:
The preparation method of described standard single-mode fiber core shift structure, step is as follows:
1) a segment standard single-mode fiber and interlude standard single-mode fiber are carried out core shift welding, discharge capacity 200bit, core shift amount
Core shift distance is controlled less than 9 μm and by controlling the motor of heat sealing machine；
2) a length of 3-5cm of interlude standard single-mode fiber is intercepted；
3) the interlude standard single-mode fiber after the 3rd segment standard single-mode fiber and intercepting is carried out core shift welding again, electric discharge
Amount 200bit, core shift amount controls core shift distance less than 9 μm and by controlling the motor of heat sealing machine, can be prepared by standard list
Mode fiber core shift structure.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390655A (en) * | 2014-09-19 | 2015-03-04 | 天津理工大学 | High-sensitivity fiber laser sensor based on core raised structure |
| CN105140767A (en) * | 2015-09-18 | 2015-12-09 | 华中科技大学 | Dual-wavelength single-longitudinal-mode fiber laser |
| CN108919427B (en) * | 2016-04-28 | 2020-09-11 | 北京信息科技大学 | Wavelength switch system based on electrode discharge and graphene coated fiber grating |
| CN105974521B (en) * | 2016-04-28 | 2018-11-27 | 北京信息科技大学 | A kind of wavelength switch device based on electrode discharge and graphene coated fiber grating |
| CN106054316A (en) * | 2016-08-12 | 2016-10-26 | 重庆大学 | Integrated all-fiber interference-type light modulator based on graphene and manufacturing method thereof |
| CN113131317B (en) * | 2021-03-03 | 2022-05-10 | 长春理工大学 | Tunable mode-locked fiber laser based on single-mode double-eccentric-core structure and control method |
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