CN104865637B - A kind of stimulated Brillouin scattering effect enhanced fiber - Google Patents

A kind of stimulated Brillouin scattering effect enhanced fiber Download PDF

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CN104865637B
CN104865637B CN201510308995.2A CN201510308995A CN104865637B CN 104865637 B CN104865637 B CN 104865637B CN 201510308995 A CN201510308995 A CN 201510308995A CN 104865637 B CN104865637 B CN 104865637B
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fiber
optical fiber
core
fibre core
relation
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CN104865637A (en
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柯昌剑
郭臻
潘登
刘德明
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Huazhong University of Science and Technology
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
    • G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
    • G02B6/02028—Small effective area or mode field radius, e.g. for allowing nonlinear effects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02228—Dispersion flattened fibres, i.e. having a low dispersion variation over an extended wavelength range
    • G02B6/02238—Low dispersion slope fibres
    • G02B6/02242—Low dispersion slope fibres having a dispersion slope <0.06 ps/km/nm2

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract

The invention discloses a kind of stimulated Brillouin scattering effect enhanced fiber, including fibre core and the covering around fibre core；Wherein, the fiber core radius a of optical fiber is 1 μm~7 μm, and fiber core is doped to GeO2、P2O and Al2O3In one kind；Clad doped material is F；The relation between refractive indices n and fiber core radius a between fibre core and covering is：0 ＜ a2Δn≤0120μm2；Acoustic rate difference Δ V between fibre core and coveringlRelation between fiber core radius a is：0 ＜ a2ΔVl≤225μm2M/s, monochromatic light mould is produced with the excitation of Simultaneous Stabilization in a fiber and monophone mould fetters；The common activation of acousto-optic field can be obtained in fiber core doping different from covering, is coupled in optical fiber and forms single brillouin gain peak；The gain peak position of its gain spectral of optical fiber provided by the invention has higher gain coefficient, and the full width at half maximum of brillouin gain spectrum is narrower, about 10MHz；And the dispersion parameters absolute value of optical fiber can also be increased while stimulated Brillouin scattering effect is strengthened, nearby it restrained effectively four-wave mixing effect in 1.55 μm conventional of operating wavelength windows.

Description

A kind of stimulated Brillouin scattering effect enhanced fiber
Technical field
The invention belongs to technical field of optical fiber, more particularly, to a kind of stimulated Brillouin scattering effect enhanced fiber.
Background technology
The gain spectral bandwidth of stimulated Brillouin scattering in optical fiber is very narrow (10MHz or so), utilizes this narrow bandwidth gain Spectral property, it can be used to build the active optics wave filter of high Q parameters, to extract the specific wavelength composition of measured signal, in superelevation There is extensive purposes in the fields such as resolution spectrum analysis, microwave photon filtering.When being applied in these fields, wave filter should have There is the transmission curve of narrow pass band width, high isolation and single peak；Therefore, forming the active light with high Q parameters Learn the optical fiber of wave filter, it should which there is the narrow bandwidth, high-gain coefficient and single gain peak of brillouin gain spectrum.
Periodical literature (Koyamada Y, Sato S, Nakamura S, et al.Simulating and designing Brillouin gain spectrum in single-mode fibers[J].Journal of Lightwave Technology,2004,22(2):631.) it is that pure quartzy optical fiber in wavelength is 1.55 μm, to disclose fibre core to mix GeO2 coverings Under brillouin gain spectrum, the single-mode fiber measurement that the document is mentioned has multiple brillouin gain peaks.
A kind of nonlinear optical fiber is disclosed in the B of Application No. CN 101174002 patent document, by reducing in optical fiber Light field effective area so that the nonlinear constant increase in optical fiber so that Self-phase modulation, Cross-phase Modulation and four-wave mixing Strengthened etc. nonlinear effect；But for Brillouin scattering benefit spectrum, before optical fiber can not meet disclosed in the patent document State the performance of high Q parameters active optics wave filter application.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of increasing of stimulated Brillouin scattering effect Strong type optical fiber, its object is to motivate monophone mould and monochromatic light mould using variety classes doping to fibre core and covering, pass through acousto-optic Coupling between mould produces the brillouin gain spectrum with single gain peak, to meet optical fiber for building high Q parameters active light Learn the requirement of wave filter.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of stimulated Brillouin scattering effect enhancing Type optical fiber, with a width of 10MHz, including fibre core and the covering around fibre core；
Wherein, the fiber core radius a of optical fiber is 1 μm~7 μm；Wherein, fiber core is doped to GeO2、P2O5And Al2O3In It is a kind of；Clad doped F；
To obtain the efficient coupling of monochromatic light mould and monophone mould, optical fiber dopant material and concentration are adjusted so that fiber core refractive index Relation between the difference Δ n and fiber core radius a of cladding index meets 0 ＜ a2Δ n≤0.120, fibre core acoustic rate and bag The difference Δ V of layer acoustic ratelAnd fiber core radius meets 0 ＜ a2ΔVl≥225μm2·m/s；With swashing for Simultaneous Stabilization in a fiber Encourage and produce monochromatic light mould and the constraint of monophone mould；The common activation of acousto-optic field can be obtained in fiber core doping different from covering, Coupling forms single brillouin gain peak in optical fiber.
Preferably, fiber core radius a is 3 μm~7 μm, fibre core doping GeO2, clad doped F；Fibre core GeO2Doping concentrationMeetCovering F doping concentrations ωFMeet：
GeO is adulterated by fibre core2, doped cladding layer Miscellaneous F and by the constraint of each doping concentration within the above range, obtain the stable excitation of monochromatic light mould and monophone mould in optical fiber, obtain single The brillouin gain spectrum of gain peak.
Preferably, fiber core radius a is 1 μm~3 μm, fibre core doping GeO2, clad doped F, fibre core GeO2Doping concentrationMeetCovering F doping concentrations ωFMeet
By reducing optical fiber fibre footpath, to reduce light field effective area in optical fiber, acousto-optic field coupling efficiency is improved, so as to improve Gain coefficient of the brillouin gain spectrum at gain peak in optical fiber.
Preferably, above-mentioned fiber core radius a is 1 μm~3 μm of optical fiber, its fibre core GeO2Doping concentration meets relation：Fibre core GeO2Doping concentrationValue within the range, can Increase phonon lifetime in optical fiber, reduce the bandwidth of brillouin gain spectrum in optical fiber.
Preferably, optical fiber includes fibre core, inner cladding and surrounding layer；Inner cladding coats fibre core, surrounding layer cladding inner cladding；
Wherein, the fiber core radius a of optical fiber is 1.5 μm~3 μm, the inner cladding external diameter b of optical fiber and the fiber core radius a of optical fiber it Between relation be b=(1.6 ± 0.05) a；
Wherein, fiber core is doped to GeO2、P2O5And Al2O3In one kind；Inner cladding is identical with surrounding layer dopant, For F；
Adjust the dopant material and concentration of fiber core and surrounding layer so that fiber core meets to close with cladding refractive index It is 0 ＜ a2Δn≤0.120μm2, fiber core and surrounding layer acoustic rate meet the ＜ a of relation 02ΔVl≤225μm2M/s, to obtain Obtain the efficient coupling of monochromatic light mould and monophone mould；
Adjust fibre cladding doping concentration so that fibre cladding refractive index n1With cladding refractive index n2Between relation meet 0 ＜ n2-n1＜ 0.007, covering acoustic rate vl1Outside with fibre core acoustic rate vlBetween meet the ＜ a of relation 02(vl1-vl)≤225μm2· m/s。
Preferably, fiber core radius a is 1.5 μm~3 μm, fibre core doping GeO2, inner cladding and surrounding layer adulterate F, fibre core GeO2Doping concentrationMeet：Surrounding layer F doping concentrations ωOutside F Meet：Inner cladding F doping concentrations ωIn FTogether When meet ωIn F≤ωOutside F+ 1.4549 andIt is above-mentioned with inner cladding and surrounding layer Double-clad structure optical fiber, at fiber work wavelength window, fibre-optical dispersion absolute value is larger, effectively inhibits four in optical fiber Wave mixing imitates effect, while avoids excessive refringence and motivate light field high-order mode and produce the brillouin gain of multi-peak Spectrum.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show Beneficial effect：
(1) a kind of stimulated Brillouin scattering effect enhanced fiber provided by the invention, by adjusting fiber core radius and mixing Miscellaneous parameter so that the light field harmony field excitation in optical fiber meets single mode condition, is produced by the coupling between acousto-optic mould and there was only list The brillouin gain spectrum of individual gain peak, and gain spectral has high gain coefficient；
(2) in a kind of preferred scheme of stimulated Brillouin scattering effect enhanced fiber provided by the invention, reduction is passed through Fiber core radius reaches the effect of acousto-optic field efficient coupling, significantly increases optical fiber to obtain less light field effective area Brillouin gain coefficient, and gain spectral bandwidth is maintained within 20MHz；
(3) in a kind of preferred scheme of stimulated Brillouin scattering effect enhanced fiber provided by the invention, there is provided tool There is the optical fiber of the double-clad structure of inner cladding and surrounding layer, by adjusting the doping concentration of its inner cladding, change fibre-optic waveguide color Dissipate, so as to change optical fiber overall dispersion so that the dispersion values absolute value at fiber work wavelength window is larger, effectively suppresses light Four-wave mixing effect in fibre；To suppress the distortion for the measured signal that the four-wave mixing effect in optical fiber is brought to wave filter application Influence.
Brief description of the drawings
Fig. 1 is the relation schematic diagram between each parameter in optical fiber；
Fig. 2 is brillouin gain spectrum simulation curve figure in general single mode fiber；
Fig. 3 is brillouin gain spectrum simulation curve figure in the codope optical fiber that embodiment 1 provides；
Fig. 4 is bandwidth of an optical fiber under different fine footpaths, gain coefficient, Brillouin's frequency comparison diagram；
Fig. 5 is dispersion curve and zero-dispersion wavelength of the different type optical fiber in 1.55 mum wavelengths；
Fig. 6 is the doubly clad optical fiber brillouin gain spectrum analogous diagram that embodiment 26 and embodiment 27 provide；
Fig. 7 is the fine layer refractive index profile structure chart of optical fiber provided by the invention；
Fig. 8 is the fine layer acoustic rate sectional structure chart of optical fiber provided by the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below Conflict can is not formed each other to be mutually combined.
It is the relation signal in optical fiber between material and structural parameters and excited Brillouin dispersion gain spectral property shown in Fig. 1 Figure.The bandwidth of brillouin gain spectrum, gain coefficient and peak value number couple effect in phonon lifetime, acousto-optic field in by optical fiber in optical fiber The influence of rate and the acousto-optic field mode number of excitation, and the acousto-optic field mould of phonon lifetime, acousto-optic field coupling efficiency and excitation Formula number is determined by optical fiber dopant material and concentration, fiber core radius, cladding structure etc. again；Enter one below by way of specific embodiment Step illustrates.
Embodiment 1,
The optical fiber that embodiment 1 provides includes fibre core and the covering around fibre core；
Wherein, fiber core radius a is 3 μm, and fibre core doping Ge concentration is 1.646%, fiber core refractive index 1.4616；Doped cladding layer Miscellaneous F concentration is 0.335%, cladding index 1.4551；
Above-mentioned optical fiber doping concentration and fiber core radius to only exist a form of light field in the optical fiber, light field parameter a2 Δ n is 0.036 μm2；Corresponding to only one βacoust；Wherein, βacoustThe component in shaft axis of optic fibre direction is sweared for sound wave；
The optical fiber that embodiment 1 provides, because optical fiber adulterates effect so that the acoustic rate of its fibre core and covering difference is Δ VlFor 16.6m/s；Therefore a2ΔVl=149.6 μm2M/s, compared with general single mode fiber, a2ΔVlSmall an order of magnitude, to be single Acoustic mode optical fiber；Monochromatic light mould and monophone mould intercouple so that the brillouin gain spectrum in optical fiber is single peak；Brillouin shift For 11.06GHz, brillouin gain spectrum full width at half maximum is 11.5MHz；
It is the brillouin gain spectrum simulation curve figure of general single mode fiber shown in Fig. 2.It is that embodiment 1 provides shown in Fig. 3 The brillouin gain spectrum simulation curve figure of codope optical fiber.Compare the single-mode fiber that Fig. 3 and Fig. 2 can be seen that the offer of embodiment 1 In only a brillouin gain spectrum peak.
Table 1 lists the parameter of the optical fiber of the offer of 1~embodiment of embodiment 13.* symbology brillouin gains in table 1 Peak has two, but its secondary peak gain coefficient is much smaller than main peak, can ignore；It is specific as follows：
The parameter for the optical fiber that the 1~embodiment of embodiment 13 of table 1 provides
From table 1 provide data analysis draw, 1~embodiment of embodiment 13 provide optical fiber, can simultaneously and stably Monochromatic light mould and monophone mould are motivated, the brillouin gain spectrum at single gain peak is formed after monochromatic light mould and monophone mode coupling；Implement The optical fiber that example 2 provides, although brillouin gain peak has two, its secondary peak gain coefficient is much smaller than main peak, and secondary peak is to gain spectral Influence can ignore, be regarded as specific single gain peak.
Embodiment 14,
The optical fiber that embodiment 14 provides includes fibre core and the covering around fibre core；
Wherein, fiber core radius a is 2 μm, and fibre core doping Ge concentration is 3.704%, refractive index 1.4634；Clad doped F Concentration is 0.748%, refractive index 1.4544；Light field is unimodular property, parameter a2Δ n is 0.0364 μm2, corresponding to unique one Individual βacoust；Optical fiber doping effect make it that the acoustic rate of its fibre core and covering difference is Δ VlFor 38.4m/s, a is obtained2ΔVl= 153.6μm2·m/s；
Compared with the optical fiber that embodiment 1 provides, the optical fiber of the offer of embodiment 14, the velocity of sound difference Δ between its fibre core and covering VlOptical fiber than embodiment 1 improves about 3 times, but fiber core radius is reduced to 2/3 of fiber core radius in embodiment 1；It is real The sound field normalized parameter a of the optical fiber of the offer of example 14 is provided2ΔVlSubstantially remain unchanged, show as monophone module feature；
According to simulation result, the Brillouin shift for the optical fiber that embodiment 14 provides is 10.91GHz, and full width at half maximum is 13.0MHz；The fiber core radius for setting the offer of embodiment 1 as 3 μm of fiber gain coefficient maximum is 1, then embodiment 14 provides Fiber core radius be 2 μm fiber gain coefficient be 2.1689；The optical fiber Brillouin gain coefficient of embodiment 14, which has, significantly to be carried Height, the optical fiber is when as active optics wave filter with higher isolation.
Embodiment 15,
The optical fiber that embodiment 15 provides includes fibre core and the covering around fibre core；
Wherein, fiber core radius a is 1.5 μm, and fibre core doping Ge concentration is 6.584%, refractive index 1.4676；It is clad doped F concentration is 1.330%, refractive index 1.4516；Parameter a2Δ n is 0.036 μm2, make corresponding to only one optical fiber doping effect Obtain the parameter a between the acoustic rate difference of its fibre core covering and fiber core radius2ΔVl=153.7 μm2·m/s；
Compared with embodiment 1 and embodiment 14, the optical fiber of the offer of embodiment 15, fiber core radius reduces, and fibre core and covering Between the velocity of sound difference further increase；The acoustic rate difference for the optical fiber that embodiment 15 provides is about 7 times in embodiment 1, and sound field Normalized parameter a2ΔVlIt is basically unchanged, therefore sound field is also unimodular property；Brillouin gain spectrum is unimodal, and Brillouin shift is 10.67GHz, full width at half maximum 15.0MHz；The fiber core radius of the offer of embodiment 1 is set as 3 μm of fiber gain coefficient maximum For 1, then the fiber gain coefficient that embodiment 15 provides fiber core radius is 1.5 μm is 3.8472, and comparative analysis goes out, embodiment 15 Optical fiber Brillouin gain coefficient it is bigger than embodiment 14, when the optical fiber applies to active optics wave filter, isolation enters one Step improves.
It is bandwidth of an optical fiber, gain coefficient, Brillouin's frequency in embodiment 1, embodiment 14 and embodiment 15 as shown in Figure 4 Comparison diagram, it can be seen that as optical fiber core diameter reduces, fiber gain coefficient significantly improves, and Brillouin's frequency reduces, but The bandwidth increase of brillouin gain spectrum；
And on the other hand, due to fibre core GeO2Doping concentration improve so that phonon lifetime reduces in optical fiber, and optical fiber Brillouin gain spectrum full width at half maximum is related to phonon lifetime, and optical fiber Brillouin gain spectral bandwidth is with fibre core GeO2Doping concentration Improve and increase, therefore need to compromise while core diameter is reduced and consider gain coefficient and bandwidth；Bandwidth is in 10MHz~15MHz, optical fiber Brillouin gain spectrum gain coefficient and bandwidth reach balance；
Table 2 lists the parameter of the optical fiber of the offer of 14~embodiment of embodiment 25, and wherein brillouin gain coefficient is to implement It is specific as follows on the basis of example 1：
The parameter for the optical fiber that the 14~embodiment of embodiment 25 of table 2 provides
Analyzed from table 2, brillouin gain coefficient gradually increases with the reduction of fiber core radius；With subtracting for fiber core radius Small and doping concentration raising, in optical fiber phonon lifetime reduce, the increase of gain spectral bandwidth；Obtained by the date comprision of table 2 Know, in the case of similar in fiber core radius, reduce fibre core doping concentration, can effectively reduce optical fiber Brillouin gain spectral band It is wide.
Regulation optical fiber structure and doping concentration are while realization strengthens brillouin gain coefficient, it is possible to cause four ripples It is mixed effect enhancing.And in practice, when optical signal has multiple cycles and interval is smaller, four-wave mixing effect is direct Have influence on the using effect and signal measurement and the accuracy of processing of active optics wave filter.
The codope optical fiber for being 2 μm for the fiber core radius that embodiment 14 provides, it is its dispersion at 1.5625 μm in wavelength Value is zero, and dispersion values are in 1.1 μm to 1.7 μm of wave band, are dispersion maximum absolute value, about -38ps/ at 1.1 μm in wavelength km/nm；Especially, the waveguide dispersion of the optical fiber reaches negative dispersion maximum, about -26ps/km/nm, negative dispersion at 1.57 μm Minimum value is at 1.1 μm, about -16.7ps/km/nm；
Optical fiber of the operation wavelength near 1.55 μm, which can be encouraged effectively, produces unimodal brillouin gain spectrum, but due to Dispersion at 1.55 μm is -0.78728ps/km/nm, easily produces four-wave mixing effect；Therefore the optical fiber is filtered in active optics In the application of ripple device, distortion may be brought because of measurement and processing of the four-wave mixing to signal；Can effectively it be disappeared using double-clad structure The distortion effect brought except four-wave mixing effect.
Embodiment 26,
The optical fiber that embodiment 26 provides includes fibre core, the inner cladding for coating fibre core and the surrounding layer for coating inner cladding；
Wherein, fiber core radius a is 2 μm, and cladding outer diameter b is 3.3 μm, and surrounding layer external diameter is 90 μm；Fibre core adulterates Ge concentration For 4.1152%, refractive index 1.464；Clad doped F concentration is 0.83136%, refractive index 1.454；Surrounding layer doping F is dense Spend for 0.62352%, refractive index 1.455；
The optical fiber that embodiment 26 provides, its brillouin gain spectrum are multi-peak, main peak frequency 10.87GHz, secondary peak frequency For 10.96GHz, wherein secondary peak two orders of magnitude smaller than the gain of main peak；
The optical fiber that embodiment 26 provides, about 1.61 μm of wavelength at its dispersion zero-point, the fibre core provided relative to embodiment 14 For 2 μm of codope optical fiber, moved at its dispersion zero-point to long wave length direction；In 1.1 μm to 1.7 μm of wave band, Wavelength is dispersion maximum absolute value, about -40ps/km/nm at 1.1 μm；
The waveguide dispersion for the optical fiber that embodiment 26 provides reaches negative dispersion maximum, about -30ps/km/nm at 1.53 μm, Reach negative dispersion minimum value, about -19ps/km/nm at 1.1 μm；It is 1.55 μm of places in operation wavelength, the dispersion of the optical fiber is- 4.34198ps/km/nm；
Analyzed from the dispersion parameters of the above-mentioned optical fiber to embodiment 26, double-clad structure causes fibre-optic waveguide dispersion Negative dispersion value becomes big, and the zero dispersion point of optical fiber is moved to long wave length direction, and the zero dispersion point of optical fiber is drifted to beyond service band； But compared with embodiment 14, the monophone module feature of optical fiber is changed into more acoustic modes, and brillouin gain spectrum is changed into double-hump characteristics.
Embodiment 27,
The optical fiber that embodiment 27 provides includes fibre core, the covering for coating fibre core and the surrounding layer for coating covering；
Wherein, fiber core radius a is 2 μm, and cladding outer diameter b is 3.3 μm；Wherein, fibre core doping Ge concentration is 4.1152%, refractive index 1.464；Clad doped F concentration is 1.0392%, refractive index 1.453, surrounding layer doping F concentration For 0.62352%, refractive index 1.455；
The optical fiber that embodiment 27 provides, its Brillouin's frequency is 10.86GHz；Wavelength is about 1.64 μm at its dispersion zero-point, Compared to embodiment 26, its dispersion zero-point further moves to long wavelength；In 1.1 μm to 1.7 μm of wave band, dispersion absolute value Maximum is at 1.1 mu m wavebands, dispersion absolute value about -43ps/km/nm at this；
Its waveguide dispersion negative dispersion value reaches maximum at 1.51 μm of wavelength, about -35ps/km/nm, in 1.1 μm of wavelength Place, about the waveguide dispersion negative dispersion value minimum value of optical fiber, -22ps/km/nm；At operation wavelength is 1.55 μm, the optical fiber Total dispersion is -8.10925ps/km/nm；
Relative to embodiment 26, embodiment 27 provide optical fiber operation wavelength be 1.55 μm at dispersion absolute value it is bigger, Reach the effect for suppressing four-wave mixing in fiber effect；Compared with embodiment 26, embodiment 27 influences without secondary peak；
It is dispersion curve of the optical fiber in 1.55 mum wavelengths of embodiment 14, embodiment 26 and the offer of embodiment 27 shown in Fig. 5 And zero-dispersion wavelength；It can be seen that by the way that covering to be divided into the double-clad structure of inner cladding and surrounding layer, and optimize The doping of the inner cladding of optical fiber so that the dispersion absolute value at 1.55 mum wavelengths becomes big, and this is imitated to the four-wave mixing in optical fiber Inhibition should be formd；In addition, the dispersion zero-point value in optical fiber moves to long wave length direction so that the use work of optical fiber Wave band is wider.
Such as the brillouin gain spectrum analogous diagram that Fig. 6 is embodiment 26 and embodiment 27；It can be seen that embodiment 26 Double-clad structure destroy gain spectral single-peak response, but by optimizing the doping concentration of optical fiber inner cladding so that Brillouin increases Secondary peak in benefit spectrum is gradually reduced or even disappeared, and can cause in 1.55 μm of common operating wavelength windows, fibre-optical dispersion Absolute value is bigger.
Such as the fine layer refractive index profile structure chart that Fig. 7 is embodiment 26 and embodiment 27, wherein r is along fiber cross-sections radial direction Distance, a is fiber core radius, and b is optical fiber inner cladding external diameter, and n is fiber core refractive index, n1It is the refraction of optical fiber inner cladding Rate, n2It is optical fiber jacket refractive index；Refractive index between the fibre core and inner cladding and surrounding layer of optical fiber ensures that optical fiber has and only There is an optical field distribution；In addition, in double-clad structure, a covering close to fibre core enables fibre-optical dispersion region effectively The influence for the other nonlinear effects for avoiding optical fiber operating wave strong point dispersion smaller and bringing.
Such as the fine layer acoustic rate sectional structure chart that Fig. 8 is embodiment 26 and embodiment 27, wherein r is along fiber cross-sections radial direction Distance, wherein a is fiber core radius, and b is the inner cladding external diameter of optical fiber, vlIt is fiber core acoustic rate, vl1It is optical fiber Inner cladding acoustic rate, vl2It is optical fiber jacket acoustic rate；Acoustic rate relation between the fibre core of optical fiber and two coverings ensures light The stable excitation of fibre produces monophone mould, and the coupling between acousto-optic mould is so as to producing single brillouin gain spectrum.
The optical fiber that embodiment 27 provides, completely can encourage to form the brillouin gain spectrum of single peak, have higher Isolation, and the full width at half maximum of gain spectral is narrower, about 10MHz；It can also increase optical fiber while brillouin gain spectrum strengthens Dispersion parameters absolute value, nearby effectively inhibit four-wave mixing effect in 1.55 μm of wavelength.
Table 3 lists the parameter of the optical fiber of the offer of 28~embodiment of embodiment 31, specific as follows：
The parameter for the optical fiber that the 28~embodiment of embodiment 31 of table 3 provides
The fiber core radius a of embodiment 28 and embodiment 29 is 1.5 μm, and embodiment 28 only has a covering, embodiment 29 With inner cladding and surrounding layer；The fiber core radius of embodiment 30 and embodiment 31 is 3 μm, and embodiment 30 only has a covering, Embodiment 31 has inner cladding and surrounding layer；It was found from date comprision, double clad can change the dispersion of optical fiber so that optical fiber Four-wave mixing effect can effectively be suppressed at a particular wavelength.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included Within protection scope of the present invention.

Claims (6)

  1. A kind of 1. stimulated Brillouin scattering effect enhanced fiber, it is characterised in that the covering including fibre core and around fibre core；
    The fiber core radius a is 1 μm~7 μm；The fiber core is doped to GeO2、P2O5And Al2O3In one kind, it is clad doped For F；
    Relation between the fiber core refractive index and the difference Δ n and fiber core radius a of cladding index is：0 ＜ a2Δn≤0.120μ m2, the difference Δ V of the fibre core acoustic rate and covering acoustic ratelRelation between fiber core radius a is：0 ＜ a2ΔVl≤225μ m2M/s, monochromatic light mould and the constraint of monophone mould, monochromatic light mould and monophone the mould coupling in optical fiber are produced to encourage in a fiber simultaneously Close the brillouin gain spectrum for forming single gain peak.
  2. 2. optical fiber as claimed in claim 1, it is characterised in that the fiber core radius a is 3 μm~7 μm；The fibre core doping GeO2, clad doped F；
    The fibre core GeO2Doping concentrationRelation between fiber core radius a is： It is described Covering F doping concentrations ωFWith fiber core radius a and fibre core GeO2Doping concentrationBetween relation be：
  3. 3. optical fiber as claimed in claim 1, it is characterised in that the fiber core radius a is 1 μm~3 μm；The fibre core doping GeO2, clad doped F；
    The fibre core GeO2Doping concentrationRelation between fiber core radius a is：It is described Covering F doping concentrations ωFWith fiber core radius a and fibre core GeO2Doping concentrationBetween relation be：
  4. 4. optical fiber as claimed in claim 3, it is characterised in that the fibre core GeO2Doping concentrationFor：
  5. 5. optical fiber as claimed in claim 3, it is characterised in that the covering includes inner cladding and surrounding layer；The inner cladding Coat fibre core, surrounding layer cladding inner cladding；
    The fiber core radius a is 1.5 μm~3 μm, and the relation between the inner cladding external diameter b and fiber core radius a is：B=(1.6 ±0.05)a；
    Refractive indices n between the fibre core and surrounding layer and the relation between a of fiber core radius are：0 ＜ a2Δn≤0.120 μm2；Acoustic rate difference Δ V between fibre core and surrounding layerlRelation between fiber core radius a is：0 ＜ a2ΔVl≤225μm2·m/ s；
    The inner cladding refractive index n1With cladding refractive index n2Between relation be：0 ＜ n2-n1＜ 0.007；The inner cladding sound Speed vl1With fibre core acoustic rate vlAnd the relation between fiber core radius a is：0 ＜ a2(vl1-vl)≤225μm2·m/s。
  6. 6. optical fiber as claimed in claim 5, it is characterised in that the fibre core adulterates GeO2, inner cladding and surrounding layer adulterate F；
    The fibre core GeO2Doping concentrationRelation between fiber core radius a is：
    Surrounding layer F doping concentrations ωOutside FWith fibre core GeO2Relation between doping concentration is：
    The inner cladding F doping concentrations ωIn F With surrounding layer doping concentration and fibre core GeO2Relation between doping concentration is respectively：ωIn F≤ωOutside F+ 1.4549,
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US10312658B2 (en) 2017-06-22 2019-06-04 Honeywell International Inc. Brillouin gain spectral position control of claddings for tuning acousto-optic waveguides
US10401563B2 (en) * 2017-12-14 2019-09-03 Ofs Fitel, Llc Optical fibers for simultaneous measurement of temperature and strain
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