CN107367789A - A kind of compound-glass optical fiber containing chalcogenide glass fibre core and preparation method thereof - Google Patents
A kind of compound-glass optical fiber containing chalcogenide glass fibre core and preparation method thereof Download PDFInfo
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- CN107367789A CN107367789A CN201710748279.5A CN201710748279A CN107367789A CN 107367789 A CN107367789 A CN 107367789A CN 201710748279 A CN201710748279 A CN 201710748279A CN 107367789 A CN107367789 A CN 107367789A
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3555—Glasses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/365—Non-linear optics in an optical waveguide structure
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Abstract
The invention discloses a kind of compound-glass optical fiber containing chalcogenide glass fibre core and preparation method thereof, the fibre core of the compound-glass optical fiber is coaxial double-core, it includes the first fibre core and the second fibre core, first fibre core is chalcogenide glass fibre core, second fibre core is the silica glass core for the doping Ge element that cross section is annular, second fibre core forms the coaxial double-core around the first fibre core, and the diameter of the first fibre core is identical with the internal diameter of the second fibre core, and pure quartz glass covering is additionally provided with outside the second fibre core.At least end face of the first fibre core of side and the end face of the second fibre core is misaligned in the compound-glass optical fiber.The present invention is by the chalcogenide glass of high non-linearity specific refractivity will be integrated into the compound-glass optical fiber of ordinary optic fibre acquisition coaxial double-core, can not only be with less loss and ordinary optic fibre welding, and the advantage of the high non-linearity specific refractivity of chalcogenide glass can be made full use of to strengthen the non-linear behaviour of quartz glass optical fiber.
Description
Technical field
The invention belongs to technical field of optical fiber, is answered more particularly, to a kind of high non-linearity containing chalcogenide glass fibre core
Close glass optical fiber and preparation method thereof.
Background technology
It is of interest that various non-linear phenomenas in optics are continuously researcher in recent years, with nonlinear fiber optics
Development, highly nonlinear optical fiber is in super continuous spectrums generation, optical coherence tomography, high-precision sensing, medical imaging and new non-
Linear effect research etc. plays more and more important effect.Highly nonlinear optical fiber refers to that nonlinear factor compares conventional fiber
The optical fiber of big a number of orders of magnitude, the nonlinear coefficient γ of optical fiber are determined by below equation：
Wherein, n2It is the nonlinear viscoelastic piles of material, ω is light field angular frequency, and c is vacuum light speed, AeffIt is effective
Mode field area.
In recent years, the research approach for improving nonlinear fiber coefficient emerges in an endless stream, because the nonlinear refractive index system of optical fiber
Number n2The only Third order susceptibility with materialIt is relevant, in order to lift the nonlinear coefficient γ of optical fiber, conventional quartz glass optical fiber
Unique effective way be to reduce effective Model area Aeff, and new material optical fiber then can be by using high non-linearity refractive index
Coefficient n2Material drawing optical fiber, therefore improve the nonlinear factor of optical fiber at present mainly using micro- knot such as photonic crystal fiber
Structure optical fiber is either using highly-nonlinear material drawing optical fibers such as non-silica glass material such as chalcogenide glasses.Wherein, photonic crystal
The nonlinear viscoelastic piles of the microstructured optical fibers such as optical fiber are roughly the same with ordinary optic fibre, reduced by reducing core diameter
Mould effective area, so as to realize the non-linear of enhancing optical fiber, the fibre core of photonic crystal fiber is generally less than 5 μm；Chalcogenide glass light
Fine then be that chalcogenide glass has a ultra-high non-linear specific refractivity in itself, the nonlinear factor for the optical fiber that chalcogenide glass is drawn is general
Two orders of magnitude higher than ordinary optic fibre.
But problem present in it is：For microstructured optical fibers, higher nonlinear factor means smaller
Fibre core, the fibre core of common standard single-mode fiber is generally 9 μm, and the fibre core of microstructured optical fibers is generally less than 5 μm, so small fibre
For core with, because mould field mismatches, causing have sizable splice loss, splice attenuation during common standard single-mode fiber welding, general loss is big
In 4dB, the method for generally solving the problem be cave in photonic crystal fiber part holes formed transition region, with and ordinary optic fibre
Welding, but this method can not work for a long time, fusion point easily burns, it is impossible to meets engine request, and the width of reduction is lost
Spend it is limited, still an alternative is that the core diameter of increase microstructured optical fibers or using multicore structure as far as possible, make it with often
Rule pumping tail optical fiber can match, but the diameter for increasing microstructured optical fibers not only can substantially reduce the non-linear of optical fiber, can also
Cause the drift of zero dispersion point, be unfavorable for applications such as super continuous spectrums generations；For chalcogenide glass fiber, sulphur system glass
The fusing point of glass optical fiber is very low, and so that orpiment is the sulphur system optical fiber of raw material as an example, the fusing point of orpiment is 300 DEG C,
Boiling point is 700 DEG C, and common standard single-mode fiber is quartz material, quartzy softening point more than 1000 DEG C, therefore with it is common
Fused fiber splice can not realize that, usually using the method for space optical path lens focus coupling in daily research, not only process is numerous substantially
Trivial and coupling loss is generally higher than 10dB.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of answering containing chalcogenide glass fibre core
Close glass optical fiber and preparation method thereof.Obtained together by the way that the chalcogenide glass of high non-linearity specific refractivity is integrated into ordinary optic fibre
The compound-glass optical fiber of axle twin-core, the first fibre core are chalcogenide glass fibre cores, and mixing germanium silica glass core by the second fibre core surround, and are led to
The optical fiber for crossing this method making can not only be with less loss and ordinary optic fibre welding, and can make full use of chalcogenide glass
The advantage of high non-linearity specific refractivity strengthen the non-linear behaviour of quartz glass optical fiber, thus solve existing small fibre core
Micro-structural photonic crystal fiber splice loss, splice attenuation it is big, pump light leakage is more can not be melted with big nonlinear viscoelastic piles optical fiber
Connect, the technical problem that insertion loss is big.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of high non-linearity compound-glass optical fiber, institute
The fibre core for stating compound-glass optical fiber is coaxial double-core, and it includes the first fibre core and the second fibre core, and first fibre core is sulphur system glass
Glass fibre core, second fibre core are the silica glass core for the doping Ge element that cross section is annular, and second fibre core is surround
First fibre core forms the coaxial double-core, and the diameter of first fibre core is identical with the internal diameter of second fibre core, described
Pure quartz glass covering is additionally provided with outside second fibre core.
Preferably, at least end face of first fibre core of side and second fibre core in the compound-glass optical fiber
End face it is misaligned.
Preferably, at least end face of first fibre core of side and second fibre core in the compound-glass optical fiber
The distance between end face be not less than 3cm.
Preferably, a diameter of 3 μm~10 μm of first fibre core, a diameter of 9 μm~30 μm of second fibre core, institute
Cladding diameter is stated as 125 μm~400 μm.
Preferably, second fibre core is 0.3%~0.6% relative to the refractive index contrast Δ of the covering.
Preferably, the chalcogenide glass is the glass containing element sulphur with high non-linearity specific refractivity, and its is non-thread
Property specific refractivity two to three orders of magnitude higher than pure quartz glass.
According to another aspect of the present invention, there is provided a kind of high non-linearity compound glass light containing chalcogenide glass fibre core
Fine preparation method, is comprised the following steps：
(1) draw that one section of center band has an airport mixes germanium annular core fibre, and the optical fiber is referred to as into hollow silica fibre, should
Optical fiber includes the silica glass core and pure quartz glass surrounding layer of center air hole, cross section for the doping Ge element of annular；
(2) chalcogenide glass is placed in high temperature furnace and is heated at high temperature and is kept for some time, its chalcogenide glass is turned into melting
State, obtain the chalcogenide glass under molten condition；
(3) under vacuo by the hollow silica fibre preheating described in step (1) and the melting described in one end inserting step (2)
In chalcogenide glass under state, other end connection air extractor is simultaneously evacuated, in the presence of pressure difference, under the molten condition
Chalcogenide glass is inhaled into the center air hole in described hollow silica fibre, is controlled by controlling the time of pumping described
The length of chalcogenide glass filling under molten condition, obtains the primary compound-glass optical fiber containing chalcogenide glass fibre core；
(4) the primary compound-glass optical fiber containing chalcogenide glass fibre core described in step (3) is made annealing treatment, eliminated
Internal residual stress and tissue defects, are prepared the high non-linearity compound-glass optical fiber containing chalcogenide glass fibre core.
Preferably, step (1) it is described doping Ge element silica glass core relative to pure quartz glass surrounding layer phase
Refractive index difference Δ is 0.3%~0.6%.
Preferably, step (1) it is described doping Ge element silica glass core relative to pure quartz glass surrounding layer phase
Refractive index difference Δ is 0.467%.
Preferably, step (1) the center air bore dia is 3 μm~10 μm, adulterates the silica glass core of Ge element
A diameter of 9 μm~30 μm, outer cladding diameter is 125 μm~400 μm.
Preferably, step (1) the center air bore dia is 4 μm, and the silica glass core for adulterating Ge element is a diameter of
10 μm, outer cladding diameter is 125 μm.
Preferably, step (2) described chalcogenide glass is the glass containing element sulphur, and the heating temperature range is 400 DEG C and arrived
600 DEG C, the retention time is 6~10 hours.
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) optical fiber of a kind of coaxial double-core that the present invention is designed and prepared, the first fibre core are chalcogenide glass fibre cores, the fibre core
Germanium silica glass core is mixed by the second fibre core to surround, the optical fiber is because inner air core is by the sulphur system glass of high non-linearity high index of refraction
Glass is filled, and when optical transport is to filling this section of optical fiber of chalcogenide glass, can partly be entered in chalcogenide glass and be propagated, general chalcogenide glass
Nonlinear viscoelastic piles 4 × 10-18m2/ W or so, the quartz glass than routine are higher by two to three orders of magnitude.Meanwhile
Because chalcogenide glass area of section is smaller, chalcogenide glass core diameter of the present invention is 3 μm~10 μm, can be produced less effective
Model area, further to strengthen the non-linear of optical fiber.
(2) when in use, air core fibre of the both ends with germanium ring is entered compound-glass optical fiber of the invention with ordinary optic fibre
Row welding because end face does not have the presence of chalcogenide glass, can according to normal welding procedure welding, splice loss, splice attenuation very little,
It is roughly the same with the splice loss, splice attenuation of ordinary optic fibre.The dominant loss source of the compound-glass optical fiber of the present invention is that optical transport mould field is lost
With loss, model field unbalance is mainly derived from：1st, it is bound in after light beam air inlet core fibre in germanium-doped silica annulus
Caused model field unbalance during propagation；2nd, the light beam transmitted in the germanium ring with air-core enters the process of chalcogenide glass
In caused model field unbalance.Other loss such as end face reflections, Rayleigh scattering account for smaller.Beam Propagation is lost with germanium ring
Numerical aperture, germanium ring diameter and air bore dia change and change, according to requirement of experiment on-demand customization, general overall loss position
Between 1dB to 3dB, far below traditional nonlinear optical fiber and the splice loss, splice attenuation of common standard single-mode fiber.For chalcogenide glass light
Fine experimental study and engineering application has paved road.
(3) parameter designed by the present invention can as far as possible increase and be transmitted in chalcogenide glass by especially exploring
Light ratio while, caused leakage and loss in transmitting procedure are reduced as far as possible, for example, preferred fiber of the present invention
The annular silica core of doped germanium is 0.467% relative to the refractive index contrast Δ of pure silica cladding, the refractive index contrast
Corresponding to numerical aperture 0.14, for the numerical aperture 0.08 of conventional pumping output tail optical fiber, the numerical aperture of the optical fiber 0.14
Light beam can preferably be tied in the annular silica core of the doped germanium of optical fiber and transmit and reduce leakage by footpath；Secondly because filling is empty
The chalcogenide glass refractive index of stomata is 2.00 or so, and higher numerical aperture is advantageous to the sulphur system fibre core progress with high index of refraction
Match somebody with somebody, increase enters the light ratio of chalcogenide glass transmission；And for example, the external diameter of the annular silica core of currently preferred doped germanium is
10 μm, for 9 μm of the long and slender core of conventional tail, 10 μm of the fibre core during conventional tail optical fiber welding with being lost very little, moreover, bigger
Fibre core can accommodate the diameter of bigger airport and be unlikely to the severe leakage of light, filled in air-core by chalcogenide glass
Afterwards, filling chalcogenide glass can also increase in the ratio of fiber cross-sections, so as to expand the light ratio for entering chalcogenide glass transmission.It is right
It can reach 30 μm of high-power pumping tail optical fibers in core diameter, the present invention can select germanium ring diameter bigger according to actual conditions,
The bigger parameter of air core diameter.
(4) the less key factor for high non-linearity application of traditional sulphur system optical fiber is that chalcogenide glass is rolled in itself
Penetrate that rate is higher, serious end face reflection can be caused after being directly accessed traditional laser system, loss is larger, but passes through institute of the present invention
The method of design, light are propagated before entering filled with chalcogenide glass section optical fiber in the annular fibre core for mixing germanium, nothing in air-core
Optical transport, the chalcogenide glass that will not be filled directly reflect, therefore the optical fiber of the present invention is in the chalcogenide glass end face reflection of filling
Smaller, loss is low.
(5) when the annular silica core of doped germanium being considered as into covering, the present invention is designed and the optical fiber of preparation can be similar to
A kind of special doubly clad optical fiber, pump light transmit in germanium ring covering, and produce interaction, non-linear effect with sulphur system fibre core
It should be produced in sulphur system fibre core, therefore add chalcogenide glass tolerance power, by changing composite fiber preparation method of the present invention
The parameter of middle step (1) drawing optical fiber, thus it is possible to vary the ratio of transmission light into chalcogenide glass fibre core, therefore can be according to reality
Purpose is tested flexibly to select.
(6) chalcogenide glass is integrated into conventional quartz optical fiber by the present invention first, overcomes both fusion temperature difference mistakes
Big difficulty, help lend some impetus to the development of nonlinear fiber optics and realize that high non-linearity chalcogenide glass is widely applied,
For Fibre Optical Sensor, optical fiber laser etc., other field fibers provide a kind of new thinking.
Brief description of the drawings
Fig. 1 is the high non-linearity compound-glass optical fiber internal structure schematic diagram of the present invention containing chalcogenide glass fibre core；
Fig. 2 is the high non-linearity compound-glass optical fiber end section schematic diagram of the present invention containing chalcogenide glass fibre core；
Fig. 3 is the high non-linearity compound-glass optical fiber schematic cross-section of the present invention containing chalcogenide glass fibre core；
Fig. 4 is the dispersion curve for the optical fiber that the step of the embodiment of the present invention 1 (1) is drawn；
Fig. 5 is the high non-linearity compound-glass optical fiber containing chalcogenide glass fibre core that the embodiment of the present invention 1 is prepared
Dispersion curve；
Fig. 6 is the high non-linearity compound-glass optical fiber containing chalcogenide glass fibre core being prepared by the embodiment of the present invention 1
Caused super continuous spectrums.
In all of the figs, identical reference is used for representing identical element or structure, wherein：1- coats, 2-
Pure silica cladding, 3- cross sections are the annular silica glass core, 4- air-cores, the 5- chalcogenide glass fibre cores that adulterate Ge element.
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.
The invention provides a kind of high non-linearity compound-glass optical fiber, the fibre core of the compound-glass optical fiber is coaxial double-core,
It includes the first fibre core and the second fibre core, and the first fibre core is chalcogenide glass fibre core, and the second fibre core is the doped germanium that section is annular
The silica glass core of element, the second fibre core form the coaxial double-core, and the diameter of the first fibre core and second around the first fibre core
The internal diameter of fibre core is identical, and pure quartz glass covering is also set up outside the second fibre core, also has coat outside pure quartz glass covering.This is multiple
It is misaligned to close at least end face of the first fibre core of side and the end face of the second fibre core in glass optical fiber, to ensure at least one end
Welding can be carried out with ordinary optic fibre, and the distance between misaligned two end faces are not less than 3cm, to avoid optical fiber of the present invention
The first fibre core chalcogenide glass fibre core melted by heat destroys waveguiding structure and influence and fibre system when with fibre system welding
Normal welding.
In other words, the first fibre core chalcogenide glass fibre core is not required for existing all the time in this kind of composite construction optical fiber, can be with
Only in a fiber between region the first fibre core chalcogenide glass fibre core be present, it is and fine only existing second close to composite fiber end region
The annular silica glass core of core doped germanium and outer pure quartz glass covering, so as to traditional silica fibre phase welding, namely
The composite fiber both ends end section at least one end does not contain the first fibre core chalcogenide glass fibre core, and the second fibre core only partially surrounds institute
State the first fibre core and form the coaxial double-core.
A diameter of 3 μm~10 μm of first fibre core, a diameter of 9 μm~30 μm of the second fibre core, cladding diameter be 125 μm~
400μm.Second fibre core is 0.3%~0.6% relative to the refractive index contrast Δ of pure quartz glass covering.Chalcogenide glass is tool
There is the glass containing element sulphur of high non-linearity specific refractivity, such as orpiment glass its nonlinear viscoelastic piles ratio
Pure high 2 to 3 orders of magnitude of quartz glass, generally 4 × 10-18m2/ W or so；The and for example nonlinear system of germanium-arsenic-selenium chalcogenide glass
Number about 7.9 × 10-18m2The nonlinear factor of/W or so and arsenic selenide chalcogenide glass is about 1.5 × 10-17m2/W。
The preparation of high non-linearity compound-glass optical fiber of the invention containing chalcogenide glass fibre core, can enter in accordance with the following steps
OK：
(1) a hollowcore precast rod for carrying airport is made using MCVD, using wire-drawer-tower by the preform one
What section center band had an airport mixes germanium annular core fibre, referred to as air core fibre, and the optical fiber includes the annular quartz of doped germanium
Fibre core, center air hole and pure quartz glass surrounding layer；The annular silica core of doped germanium is relative to pure quartz glass surrounding layer
Refractive index contrast Δ be 0.3%~0.6%, preferably 0.467%.Center air bore dia is 3 μm~10 μm, doped germanium
A diameter of 9 μm~30 μm of annular silica core, outer cladding diameter be 125 μm~400 μm；Preferable scheme is wherein used as, in
A diameter of 4 μm of heart airport, a diameter of 10 μm of the annular silica core of doped germanium, outer cladding diameter are 125 μm, now, are drawn
Phase welding can be lost with the loss less than 5dB with conventional standard single-mode fiber in optical fiber processed, while also can guarantee that nonlinear system
Number disclosure satisfy that nonlinear fiber requirement of experiment.
(2) chalcogenide glass is placed in high temperature furnace and is heated at high temperature and is kept for some time, its chalcogenide glass is turned into melting
State, obtain the chalcogenide glass under molten condition；Chalcogenide glass is the glass containing element sulphur, and the heating temperature range is 400
DEG C to 600 DEG C, the retention time is 6~10 hours.As preferable scheme, heating-up temperature is 450 DEG C, and the retention time is 8 hours,
And be closed environment, in order to avoid be contaminated.
(3) optical fiber drawn in step (1) is gradually heating to chalcogenide glass melting temperature, preheated, and kept for 10 minutes,
The optical fiber one end is inserted in the melting chalcogenide glass in the step (2) after preheating, other end connection air extractor simultaneously seals
Interface, then air extractor be persistently evacuated, in the presence of pressure difference, the chalcogenide glass under the molten condition is inhaled into described
Hollow silica fibre in, by controlling the time of pumping to control the length that the chalcogenide glass under the molten condition is filled
Degree, obtains the primary compound-glass optical fiber containing chalcogenide glass fibre core.
(4) the primary compound-glass optical fiber containing chalcogenide glass fibre core described in step (3) is made annealing treatment, as
Preferable scheme, optical fiber in step (3) is annealed 3 hours at 350 DEG C, is gradually cooled to room temperature.Prevent because glass heat conduction
Property difference and the thermograde of caused internal layer and superficial layer, stress and tissue defects are reduced or eliminated with this, be prepared containing
The high non-linearity compound-glass optical fiber of chalcogenide glass fibre core.
It is embodiment below：
One of the high non-linearity compound-glass optical fiber of sulfur-bearing system provided by the invention glass core is to use with example
This optical fiber of femtosecond laser pumping produces super continuum light spectrum.Super continuum light spectrum Raman scattering is micro-, multi-wavelength tuning, frequency degree
There is important research to be worth and effect in the field such as amount, optical fiber high-precision sensing and spectral scan, in recent years, atmospheric communication, red
The rise of outer remote sensing, infrared imaging and infrared laser guidance etc. causes the super continuous spectrums of mid and far infrared to turn into new research heat
Point, conventional quartz glass optical fiber have strong intrinsic loss after wavelength is more than 3 μm, typically pass through quartzy photonic crystal fiber
Caused super continuous spectrums end in 3 μm, but chalcogenide glass has excellent translucency, such as trisulfides two in mid and far infrared
Loss after arsenic optical fiber dewater treatment at 4 μm can be with as little as 0.7dB/m, and its nonlinear viscoelastic piles is up to 1.5 × 10-17m2/ W, therefore sulphur system optical fiber is the currently the only medium that can produce mid and far infrared super continuous spectrums, however chalcogenide glass there is also
That fusing point is low, damage threshold is low, the natural inferior position of easy fracture etc., but by the design of this patent, sulphur system glass can made up
The advantage of chalcogenide glass is fully utilized while glass deficiency, the inside of optical fibre designed by the present invention is filled with sulphur system glass
Glass, the super continuous spectrums of mid and far infrared can be produced using femto-second laser pumping.
A kind of preparation method of the high non-linearity compound-glass optical fiber of sulfur-bearing system glass core, comprises the following steps：
(1) a hollowcore precast rod for carrying airport is made using MCVD, using wire-drawer-tower by the preform one
What section center band had an airport mixes germanium annular core fibre, referred to as air core fibre, and the optical fiber includes doping Ge element section and is
The silica glass core of annular, center air hole and pure quartz glass surrounding layer, wherein stone of the doping Ge element section for annular
A diameter of 10um of English glass core, a diameter of 4um of central circular airport, pure quartzy outer cladding diameter are 125um；
(2) chalcogenide glass orpiment is placed in high temperature furnace and be heated at high temperature, heating-up temperature is 450 DEG C, the retention time
For 8 hours, chalcogenide glass is turned into molten condition, obtain the orpiment chalcogenide glass under molten condition.
(3) optical fiber drawn in step (1) was first gradually heating to 450 DEG C in 1 hour and preheats and keep 10 minutes, in advance
The optical fiber one end is inserted in the melting chalcogenide glass in the step (2) after heat, the other end connects air extractor and sealed and connects
Mouthful, then air extractor is persistently pumped to pressure as 133.3 × 10-6Pa, in the presence of pressure difference, melting chalcogenide glass is inhaled
Enter in described air core fibre, kept for 1 hour of sealing state of the optical fiber and air extractor, fill out melting orpiment
It is 2cm to fill length, obtains the primary compound-glass optical fiber containing chalcogenide glass fibre core；
(4) the primary compound-glass optical fiber containing chalcogenide glass fibre core is subjected to the processing such as anneal, by the optical fiber
Annealed 3 hours at 350 DEG C of arsenic trisulphide glass transition temperature, be gradually cooled to room temperature.Prevent from producing because of glass poor thermal conductivity
Raw internal layer and the thermograde of superficial layer, the residual stress and tissue defects of inside are eliminated, prepares the height described in the invention
Non-linear compound-glass optical fiber, resulting optical fiber one end is cut out to the air core fibre of suitable length, makes remaining air-core
The length of optical fiber is 10cm or so, i.e. the first fibre core chalcogenide glass fibre core and the second fibre core doping Ge element silica glass core
The distance between misaligned and misaligned both ends of the surface in end face be 10cm or so, the other end cuts out all air core fibres,
Obtain the high non-linearity compound-glass optical fiber for the present embodiment.
The compound-glass optical fiber of the representative instance of the present invention is obtained according to above-mentioned preparation method, internal structure is had an X-rayed such as
Fig. 1, end section such as Fig. 2, sectional view such as Fig. 3, including coat 1, pure silica cladding 2, the doping Ge element that cross section is annular
Silica glass core 3, surround air-core 4, filling chalcogenide glass fibre core 5.
The dispersion curve such as Fig. 4 for the air core fibre that the representative instance step (1) obtains, the sulphur of the obtained representative instance
It is dispersion curve such as Fig. 5 of glass-filled section, is full negative dispersion in mid and far infrared because chalcogenide glass fibre core is too small.Will be free
One end of gaseous core optical fiber and the tail optical fiber phase welding of femtosecond laser pumping source, splice loss, splice attenuation is in below 3dB at this.Peak power
5000W, the typical optical fiber of the femtosecond laser pumping that wavelength the is 2 microns present invention can be produced as Fig. 6 mid and far infrared is super continuous
Spectrum.
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 (10)
- A kind of 1. high non-linearity compound-glass optical fiber, it is characterised in that the fibre core of the compound-glass optical fiber is coaxial double-core, its Including the first fibre core and the second fibre core, first fibre core is chalcogenide glass fibre core, and second fibre core is that cross section is annular Doping Ge element silica glass core, second fibre core forms the coaxial double-core around first fibre core, and described The diameter of first fibre core is identical with the internal diameter of second fibre core, and pure quartz glass covering is additionally provided with outside second fibre core.
- 2. compound-glass optical fiber as claimed in claim 1, it is characterised in that at least side in the compound-glass optical fiber The end face of first fibre core and the end face of second fibre core are misaligned.
- 3. compound-glass optical fiber as claimed in claim 1, it is characterised in that at least side in the compound-glass optical fiber The distance between the end face of first fibre core and the end face of second fibre core are not less than 3cm.
- 4. compound-glass optical fiber as claimed in claim 1, it is characterised in that a diameter of 3 μm~10 μm of first fibre core, A diameter of 9 μm~30 μm of second fibre core, the cladding diameter are 125 μm~400 μm.
- 5. compound-glass optical fiber as claimed in claim 1, it is characterised in that second fibre core relative to the covering phase Refractive index difference Δ is 0.3%~0.6%.
- 6. compound-glass optical fiber as claimed in claim 1, it is characterised in that the chalcogenide glass is to be reflected with high non-linearity The glass containing element sulphur of rate coefficient, its nonlinear viscoelastic piles two to three orders of magnitude higher than pure quartz glass.
- 7. a kind of preparation method of the high non-linearity compound-glass optical fiber containing chalcogenide glass fibre core, it is characterised in that comprising such as Lower step：(1) draw that one section of center band has an airport mixes germanium annular core fibre, the optical fiber is referred to as into hollow silica fibre, the optical fiber Include the silica glass core of center air hole, cross section for the doping Ge element of annular and pure quartz glass surrounding layer；(2) chalcogenide glass is placed in high temperature furnace and is heated at high temperature and is kept for some time, its chalcogenide glass is turned into molten condition, Obtain the chalcogenide glass under molten condition；(3) under vacuo by the hollow silica fibre preheating described in step (1) and the molten condition described in one end inserting step (2) Under chalcogenide glass in, the other end connection air extractor simultaneously be evacuated, in the presence of pressure difference, the sulphur system under the molten condition Glass is inhaled into the center air hole in described hollow silica fibre, and the melting is controlled by controlling the time of pumping The length of chalcogenide glass filling under state, obtains the primary compound-glass optical fiber containing chalcogenide glass fibre core；(4) the primary compound-glass optical fiber containing chalcogenide glass fibre core described in step (3) is made annealing treatment, eliminated internal Residual stress and tissue defects, the high non-linearity compound-glass optical fiber containing chalcogenide glass fibre core is prepared.
- 8. preparation method as claimed in claim 7, it is characterised in that the quartz glass of step (1) the doping Ge element is fine Core is 0.3%~0.6% relative to the refractive index contrast Δ of pure quartz glass surrounding layer.
- 9. preparation method as claimed in claim 7, it is characterised in that step (1) the center air bore dia is 3 μm~10 μm, a diameter of 9 μm~30 μm of the silica glass core of Ge element is adulterated, outer cladding diameter is 125 μm~400 μm；Preferably, walk Suddenly (1) described center air bore dia is 4 μm, adulterates a diameter of 10 μm of the silica glass core of Ge element, and outer cladding diameter is 125μm。
- 10. preparation method as claimed in claim 7, it is characterised in that step (2) described chalcogenide glass is the glass containing element sulphur Glass, the heating temperature range are 400 DEG C to 600 DEG C, and the retention time is 6~10 hours.
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