CN104003614B - A kind of OAM Transmission Fibers and manufacture method thereof - Google Patents
A kind of OAM Transmission Fibers and manufacture method thereof Download PDFInfo
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- CN104003614B CN104003614B CN201410195087.2A CN201410195087A CN104003614B CN 104003614 B CN104003614 B CN 104003614B CN 201410195087 A CN201410195087 A CN 201410195087A CN 104003614 B CN104003614 B CN 104003614B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
- C03C13/046—Multicomponent glass compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
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Abstract
The invention discloses a kind of OAM Transmission Fibers and manufacture method thereof, relate to fiber optic communication field.The method includes: utilize plasma activated chemical vapour deposition technique to be sequentially depositing formation surrounding layer, annular sandwich layer and middle pericardial layer；At a temperature of 2000 DEG C～2400 DEG C, collapsing post-treatment forms OAM Transmission Fibers prefabricated rods；OAM Transmission Fibers prefabricated rods carried out wire drawing and coats external coating, forming OAM Transmission Fibers；OAM Transmission Fibers 1550nm wavelength attenuation quotient less than 2.0dB/km, OAM Transmission Fibers can support+/ 4 rank more than OAM pattern transmission, OAM mode-coupling resonat < 20dB/km.The present invention can not only meet the requirement to fibre-optic waveguide structure of the OAM optical fiber high capacity transmission, and can expand OAM pattern transmission capacity in optical fiber in a large number, it is simple to people use.
Description
Technical field
The present invention relates to fiber optic communication field, particularly relate to a kind of OAM (Orbital Angular
Momentum, orbital angular momentum) Transmission Fibers and manufacture method thereof.
Background technology
Along with the progress of society, information technology has become as the most important production of socio-economic development
One of power source, the lasting extension of information system capacity is that social informatization development is requisite
Demand, development space and the potentially boundless not discharged of information system capacity are the hugest.
In fibre system communicates, it is analyzed solving to energy, linear momentum and the polarization state of photon
Code can obtain the information entrained by photon.The capacity of optical communication system experienced by WDM
After (Wavelength Division and Multiplexing, wavelength-division multiplex) improves rate of increase,
The growth rate of the capacity of optical communication system has fallen back to about annual 0.5dB (or 12%),
The average rate of increase of the spectrum efficiency of optical communication system is about annual 1dB.
The progress of optical communication technique therewith, another physical quantity OAM (orbital angular of photon
Momentum, orbital angular momentum) by extensive concern, OAM is the most systemic
Be used in communication.Utilize exponent number value l of this group electromagnetic wave eigen mode of OAM pattern,
(different l value is i.e. utilized to represent different volume as the new parameter dimensions resource for modulation or multiplexing
Code state or different communication channel), it is possible to as the new way improving spectrum efficiency further.
Owing to l value has unlimited span, can have unlimited increase photon in theory or electromagnetic wave holds
The potentiality of the quantity of information carried.
Due to the dimension of electromagnetic wave OAM, and it is currently used for the frequency, the direction of propagation phase that communicate
Orthogonality relation is belonged to, therefore for manufactured by existing communication technology between the dimensions such as position, amplitude
For all kinds optical fiber, the distribution of OAM signal light intensity meets Gauss-Laguerre beam characteristics,
The transmission in the high index waveguide structure of center of OAM signal can cause serious pattern crosstalk,
It is difficult to the high capacity transmission of OAM pattern.
Boston Univ USA and University of Southern California achieved a length of 1.1km's in 2012
The multiplexing of special optical fiber OAM Information, but, because the transmission mode of described special optical fiber is subject to
To the restriction of fibre-optic waveguide structure, so described special optical fiber is only capable of transmitting 4 orbital angular momentums
Pattern (i.e. l=4)；The transmission capacity of the most described special optical fiber is less, is not easy to people and uses.
Summary of the invention
For defect present in prior art, it is an object of the invention to provide a kind of OAM
Transmission Fibers and manufacture method thereof, can not only meet OAM optical fiber high capacity transmission to optical fiber
The requirement of waveguiding structure, and OAM pattern transmission capacity in optical fiber can be expanded in a large number, just
Use in people.
For reaching object above, the present invention adopts the technical scheme that: a kind of OAM transmits light
Fine manufacture method, comprises the following steps:
A, percent travel according to effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the perfluoroethane C of 10% of germanium tetrachloride, 10～30%2F6Put into quartz
Guan Zhong, utilizes plasma activated chemical vapour deposition process deposits 600～4800 times, forms outsourcing
Layer；
B, percent travel according to effusion meter, by 30～the Silicon chloride. of 70%, 20～65%
Germanium tetrachloride and 0～the C of 10%2F6Put in the quartz ampoule in step A, utilize plasma
Body chemical vapor phase growing process deposits 300～1200 times, form annular sandwich layer；
C, percent travel according to effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the C of 10% of germanium tetrachloride, 10～30%2F6Put into the stone in step B
Ying Guanzhong, utilizes plasma activated chemical vapour deposition process deposits 200～6000 times, in formation
Pericardial layer；
D, will be formed with surrounding layer, annular sandwich layer and the quartz ampoule of middle pericardial layer and put into high fire stons
Ink induction furnace, this quartz ampoule collapsing at a temperature of 2000 DEG C～2400 DEG C forms solid mandrel；
Solid mandrel is processed to form OAM Transmission Fibers prefabricated rods；By wire-drawer-tower, OAM is passed
Defeated preform carries out wire drawing and coats external coating, forms OAM Transmission Fibers；Described
OAM Transmission Fibers passes less than 2.0dB/km, OAM at the attenuation quotient of 1550nm wavelength
Lose fibre and can support that the OAM pattern on more than +/-4 rank is transmitted, OAM mode-coupling resonat
<-20dB/km。
On the basis of technique scheme, described in step D, solid mandrel is processed to form
OAM Transmission Fibers prefabricated rods comprises the following steps: formed by solid mandrel melted set quartz ampoule
OAM Transmission Fibers prefabricated rods.
On the basis of technique scheme, described in step D, solid mandrel is processed to form
OAM Transmission Fibers prefabricated rods comprises the following steps: solid mandrel grinds formation OAM and passes
Defeated preform.
On the basis of technique scheme, Silicon chloride. described in step A is 70%, four
Germanium chloride is 15%, and phosphorus oxychloride is 12%, C2F6Being 5%, deposition number is 1500 times.
On the basis of technique scheme, Silicon chloride. described in step B is 40%, four
Germanium chloride is 60%, C2F6Being 1%, deposition number is 350 times.
On the basis of technique scheme, Silicon chloride. described in step C is 70%, four
Germanium chloride is 15%, and phosphorus oxychloride is 12%, C2F6Being 5%, deposition number is 4750 times.
A kind of OAM Transmission Fibers manufactured according to above-mentioned manufacture method, it is characterised in that: institute
State middle pericardial layer that OAM Transmission Fibers includes setting gradually from the inside to the outside, annular sandwich layer and outer
Covering；The radius of described middle pericardial layer is 1～52.5:1 with the ratio of the radius of annular sandwich layer,
The radius of described surrounding layer is 0.5～60.5:1 with the ratio of the radius of annular sandwich layer；
The refractive index of described middle pericardial layer is identical with the refractive index of surrounding layer；Described annular sandwich layer
Maximum refractive index is more than the refractive index of middle pericardial layer, and the maximum refractive index of annular sandwich layer is more than outsourcing
The refractive index of layer；The lowest refractive index of described annular sandwich layer is less than the refractive index of middle pericardial layer, ring
The lowest refractive index of core layer is less than the refractive index of surrounding layer；
The annular maximum refractive index of sandwich layer is defined as with the refractive index contrast of middle pericardial layer
Δn1%；The annular maximum refractive index of sandwich layer is defined as with the refractive index contrast of surrounding layer
Δn2%；The annular lowest refractive index of sandwich layer is defined as with the refractive index contrast of middle pericardial layer
Δn3%；Δn1% and Δ n2% is identical, be 0.10%～1.90%, Δ n3% be 0.01%～
0.09%.
On the basis of technique scheme, in described annular sandwich layer, it is provided with grading structure layer,
The starting point refractive index of grading structure layer and center cladding relative refractive difference are defined as Δ n4%,
The starting point refractive index of described grading structure layer and the refractive index contrast of surrounding layer, with Δ n4% phase
With, Δ n4% is 0.01%～0.06%；The refractive index curve fit slope of described grading structure layer
It is 0.7.
On the basis of technique scheme, the radius of described middle pericardial layer and the half of annular sandwich layer
The ratio in footpath is 52.5:1, and the radius of described surrounding layer with the ratio of the radius of annular sandwich layer is
4.2:1；Described Δ n1% and Δ n2% is 0.10%, described Δ n3% is 0.01%, described Δ n4%
It is 0.01%.
On the basis of technique scheme, the radius of described middle pericardial layer and the half of annular sandwich layer
The ratio in footpath is 1:1, and the radius of described surrounding layer is 60.5 with the ratio of the radius of annular sandwich layer:
1；Described Δ n1% and Δ n2% is 1.90%, described Δ n3% is 0.09%, described Δ n4%
It is 0.06%.
Compared with prior art, it is an advantage of the current invention that:
(1) the OAM Transmission Fibers of the present invention can adapt to the space phase of OAM pattern
Distribution character, it is achieved the high-fidelity transfer of OAM pattern.
(2) present invention utilizes plasma activated chemical vapour deposition technique accurate profile control energy
Power, it is possible to be directly realized by and design the annular fibre core formula waveguiding structure mated, effectively solving OAM
The doping problem of ad-hoc location in Transmission Fibers covering.Therefore, the present invention disclosure satisfy that OAM
The requirement to fibre-optic waveguide structure of the optical fiber high capacity transmission.
(3) present invention passes through plasma activated chemical vapour deposition technique, it is possible at fibre cladding
Region realizes the concentric type distribution of multiple toroidal cores Rotating fields, it is possible to ensure multiple concentric distribution
The integrity of OAM Transmission Fibers complexity cross-section structure.Therefore, the present invention can expand in a large number
Fill OAM pattern transmission capacity in optical fiber, it is simple to people use.
(4) the little surrounding layer of lowest refractive index of the annular sandwich layer of the present invention, the folding of middle pericardial layer
Penetrate rate, and then the power density of core region in signals transmission can be reduced, suppress non-thread
The distorted signals that property effect causes.
(5) by the OAM Transmission Fibers of the method manufacture of the present invention at 1550nm wavelength
Attenuation quotient can support the OAM on more than +/-4 rank less than 2.0dB/km, OAM Transmission Fibers
Pattern is transmitted, OAM mode-coupling resonat <-20dB/km.Therefore, OAM Transmission Fibers possesses good
Good optical property and reliability, its quality is preferable.
Accompanying drawing explanation
Fig. 1 is the flow chart of OAM Transmission Fibers manufacture method in the embodiment of the present invention；
Fig. 2 is the structural representation of the cross section of OAM Transmission Fibers in the embodiment of the present invention；
Fig. 3 is OAM Transmission Fibers precast rod refractivity section signal in the embodiment of the present invention
Figure.
In figure: pericardial layer in 1-, 2-annular sandwich layer, 3-grading structure layer, 4-surrounding layer.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
OAM (Orbital Angular shown in Figure 1, that the embodiment of the present invention provides
Momentum, orbital angular momentum) manufacture method of Transmission Fibers, comprise the following steps:
S1: according to the percent travel of effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the C of 10% of germanium tetrachloride, 10～30%2F6(perfluoroethane) is put into
In quartz ampoule, utilize plasma activated chemical vapour deposition process deposits 600～4800 times, formed
Surrounding layer 4.
Silicon chloride. in step S1 can be 70%, and germanium tetrachloride can be 15%, trichlorine
Oxygen phosphorus can be 12%, C2F6Can be 5%, deposition number can be 1500 times.
S2: according to the percent travel of effusion meter, by 30～the Silicon chloride. of 70%, 20～65%
Germanium tetrachloride and 0～the C of 10%2F6Put in the quartz ampoule in step S1, utilize plasma
Body chemical vapor phase growing process deposits 300～1200 times, form annular sandwich layer 2.
Silicon chloride. in step S2 can be 40%, and germanium tetrachloride can be 60%, C2F6
Can be 1%, deposition number can be 350 times.
S3: according to the percent travel of effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the C of 10% of germanium tetrachloride, 10～30%2F6Put in step S2
In quartz ampoule, utilize plasma activated chemical vapour deposition process deposits 200～6000 times, formed
Middle pericardial layer 1.
Silicon chloride. in step S3 can be 70%, and germanium tetrachloride can be 15%, trichlorine
Oxygen phosphorus can be 12%, C2F6Can be 5%, deposition number can be 4750 times.
During formation of deposits surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1, specific
Deposition raw material, flow proportional and the number of deposition, annular sandwich layer 2 can not only be controlled with outer
Covering 4, the refractive index contrast of middle pericardial layer 1, and surrounding layer 4, annular can be controlled
Sandwich layer 2 and the radii ratio of middle pericardial layer 1.
S4: the quartz ampoule that will be formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1 is put into
Pyrographite induction furnace, this quartz ampoule collapsing at a temperature of 2000 DEG C～2400 DEG C forms reality
Core rod；Solid mandrel is processed to form the OAM Transmission Fibers prefabricated rods of counter structure.
Solid mandrel is added man-hour, solid mandrel melted set quartz ampoule can be formed OAM and pass
Defeated preform, it is also possible to solid mandrel is ground formation OAM Transmission Fibers prefabricated rods.
S5: carry out being coated with outside wire drawing coating to OAM Transmission Fibers prefabricated rods by wire-drawer-tower
Layer, forms OAM Transmission Fibers.OAM Transmission Fibers is in the decay system of 1550nm wavelength
Number can support the OAM pattern on more than +/-4 rank less than 2.0dB/km, OAM Transmission Fibers
Transmission, OAM mode-coupling resonat <-20dB/km.
Shown in Figure 2, embodiment of the present invention offer manufactures based on above-mentioned manufacture method
OAM Transmission Fibers, for OAM mode signaling.OAM Transmission Fibers includes by interior
To the middle pericardial layer 1 set gradually outward, annular sandwich layer 2 and surrounding layer 4.Middle pericardial layer 1
Radius is 1～52.5:1 with the ratio of radius of annular sandwich layer 2, preferably 52.5:1 or
1:1；The radius of surrounding layer 4 is 0.5～60.5:1 with the ratio of the radius of annular sandwich layer 2,
It is preferably 4.2:1 or 60.5:1.
Shown in Figure 3, the refractive index of middle pericardial layer 1 is identical with the refractive index of surrounding layer 4.
The maximum refractive index of annular sandwich layer 2 is more than the refractive index of middle pericardial layer 1, and annular sandwich layer 2 is
High index of refraction is more than the refractive index of surrounding layer 4.The lowest refractive index of annular sandwich layer 2 is less than center
The refractive index of covering 1, the lowest refractive index of annular sandwich layer 2 is less than the refractive index of surrounding layer 4.
The annular maximum refractive index of sandwich layer 2 is defined as with the refractive index contrast of middle pericardial layer 1
Δn1%, by the refractive index contrast definition of the maximum refractive index of annular sandwich layer 2 with surrounding layer 4
For Δ n2%, by the refractive index contrast of the lowest refractive index of annular sandwich layer 2 with middle pericardial layer 1
It is defined as Δ n3%.Δn1% and Δ n2% is identical, be 0.10%～1.90%, Δ n1% and Δ n2%
It is preferably 0.10% or 1.90%；Δn3% is 0.01%～0.09%, preferably 0.01% or
Person 0.09%.
It is provided with grading structure layer 3 in annular sandwich layer 2, the starting point of grading structure layer 3 is reflected
Rate and middle pericardial layer 1 refractive index contrast are defined as Δ n4%, the starting point folding of grading structure layer 3
Penetrate the refractive index contrast of rate and surrounding layer 4, with Δ n4% is identical.Δn4% be 0.01%～
0.06%.The refractive index curve fit slope of grading structure layer 3 is 0.7.
OAM Transmission Fibers is less than 2.0dB/km, OAM at the attenuation quotient of 1550nm wavelength
Transmission Fibers can support that the OAM pattern on more than +/-4 rank is transmitted, OAM mode-coupling resonat
<-20dB/km。
OAM Transmission Fibers and the manufacture thereof of the present invention is described in detail below by 3 embodiments
Method.
Embodiment 1
According to the percent travel of effusion meter, Silicon chloride. by 70%, the germanium tetrachloride of 20%,
The phosphorus oxychloride of 10% and the C of 5%2F6Put in quartz ampoule, utilize plasma enhanced chemical vapor
Depositing operation deposits 1500 times, forms surrounding layer 4.
According to the percent travel of effusion meter, the Silicon chloride. by 70%, the germanium tetrachloride of 65%
With 1% C2F6Put in quartz ampoule, utilize plasma activated chemical vapour deposition process deposits 350
Time, form annular sandwich layer 2.
According to the percent travel of effusion meter, Silicon chloride. by 70%, the germanium tetrachloride of 20%,
The phosphorus oxychloride of 10% and the C of 5%2F6Put in quartz ampoule, utilize plasma enhanced chemical vapor
Depositing operation deposits 4750 times, pericardial layer 1 in formation.
High temperature put into by the quartz ampoule that will be formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1
Graphite induction furnace, this quartz ampoule collapsing at a temperature of 2200 DEG C forms solid mandrel.Will be real
Core rod melts set quartz ampoule and forms the OAM Transmission Fibers prefabricated rods of counter structure；By drawing
Silk tower carries out wire drawing to OAM Transmission Fibers prefabricated rods and coats external coating, forms OAM
Transmission Fibers.
The OAM Transmission Fibers that embodiment 1 manufactures at the attenuation quotient of 1550nm wavelength is
1.92dB/km, OAM Transmission Fibers can support that the OAM pattern on more than +/-22 rank is transmitted,
OAM mode-coupling resonat is-20dB/km.
A diameter of 125 μm of the silica clad of OAM Transmission Fibers, the thickness of annular fibre core is
4.0 μm, a diameter of 244 μm of coating；The radius of the middle pericardial layer 1 of OAM Transmission Fibers
It is 52.5:1 with the ratio of the radius of annular sandwich layer 2, the radius of surrounding layer 4 and annular sandwich layer
The ratio of the radius of 2 is 4.2:1；Δn1% and Δ n2% is 0.10%, Δ n3% is 0.01%,
Δn4% is 0.01%, and the refractive index curve fit slope of grading structure layer 3 is 0.7.
Embodiment 2
According to the percent travel of effusion meter, the Silicon chloride. by 80%, the germanium tetrachloride of 10%
With 30% phosphorus oxychloride put in quartz ampoule, utilize plasma activated chemical vapour deposition technique sink
Long-pending 4800 times, form surrounding layer 4.
According to the percent travel of effusion meter, the Silicon chloride. by 30% and four chlorinations of 20%
Germanium is put in quartz ampoule, utilizes plasma activated chemical vapour deposition process deposits 300 times, is formed
Annular sandwich layer 2.
According to the percent travel of effusion meter, the Silicon chloride. by 80%, the germanium tetrachloride of 10%
With 30% phosphorus oxychloride put in quartz ampoule, utilize plasma activated chemical vapour deposition technique sink
Long-pending 200 times, pericardial layer 1 in formation.
High temperature put into by the quartz ampoule that will be formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1
Graphite induction furnace, this quartz ampoule collapsing at a temperature of 2000 DEG C forms solid mandrel.Will be real
Core rod grinds the OAM Transmission Fibers prefabricated rods forming counter structure；By wire-drawer-tower pair
OAM Transmission Fibers prefabricated rods carries out wire drawing and coats external coating, forms OAM and transmits light
Fine.
The OAM Transmission Fibers that embodiment 2 manufactures at the attenuation quotient of 1550nm wavelength is
2.0dB/km, OAM Transmission Fibers can support that the OAM pattern on more than +/-4 rank is transmitted,
OAM mode-coupling resonat is-22dB/km.
A diameter of 125 μm of the silica clad of OAM Transmission Fibers, the thickness of annular fibre core is
2.0 μm, a diameter of 244 μm of coating；The radius of the middle pericardial layer 1 of OAM Transmission Fibers
It is 1:1 with the ratio of the radius of annular sandwich layer 2, the radius of surrounding layer 4 and annular sandwich layer 2
The ratio of radius be 60.5:1.Δn1% and Δ n2% is 1.90%, Δ n3% is 0.09%,
Δn4% is 0.06%, and the refractive index curve fit slope of grading structure layer 3 is 0.7.
Embodiment 3
According to the percent travel of effusion meter, Silicon chloride. by 50%, the germanium tetrachloride of 15%,
The phosphorus oxychloride of 12% and the C of 10%2F6Put in quartz ampoule, utilize plasma chemistry gas
Phase depositing operation deposits 600 times, forms surrounding layer 4.
According to the percent travel of effusion meter, the Silicon chloride. by 40%, the germanium tetrachloride of 60%
With 10% C2F6Put in quartz ampoule, utilize plasma activated chemical vapour deposition process deposits
1200 times, form annular sandwich layer 2.
According to the percent travel of effusion meter, Silicon chloride. by 50%, the germanium tetrachloride of 15%,
The phosphorus oxychloride of 12% and the C of 10%2F6Put in quartz ampoule, utilize plasma chemistry gas
Phase depositing operation deposits 6000 times, pericardial layer 1 in formation.
High temperature put into by the quartz ampoule that will be formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1
Graphite induction furnace, this quartz ampoule collapsing at a temperature of 2400 DEG C forms solid mandrel.Will be real
Core rod grinds the OAM Transmission Fibers prefabricated rods forming counter structure；By wire-drawer-tower pair
OAM Transmission Fibers prefabricated rods carries out wire drawing and coats external coating, forms OAM and transmits light
Fine.
The OAM Transmission Fibers that embodiment 3 manufactures at the attenuation quotient of 1550nm wavelength is
1.90dB/km, OAM Transmission Fibers can support that the OAM pattern on more than +/-4 rank is transmitted,
OAM mode-coupling resonat is-20dB/km.
A diameter of 125 μm of the silica clad of OAM Transmission Fibers, the thickness of annular fibre core is
2.0 μm, a diameter of 245 μm of coating；The radius of the middle pericardial layer 1 of OAM Transmission Fibers
It is 10:1 with the ratio of the radius of annular sandwich layer 2, the radius of surrounding layer 4 and annular sandwich layer 2
The ratio of radius be 0.5:1.Δn1% and Δ n2% is 1.50%, Δ n3% is 0.04%,
Δn4% is 0.04%, and the refractive index curve fit slope of grading structure layer 3 is 0.7.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications,
Within these improvements and modifications are also considered as protection scope of the present invention.This specification is not made in detail
The content described belongs to prior art known to professional and technical personnel in the field.
Claims (3)
1. the manufacture method of an OAM Transmission Fibers, it is characterised in that include following step
Rapid:
A, percent travel according to effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the perfluoroethane C of 10% of germanium tetrachloride, 10～30%2F6Put into quartz
Guan Zhong, utilizes plasma activated chemical vapour deposition process deposits 600～4800 times, forms outsourcing
Layer (4)；
B, percent travel according to effusion meter, by 30～the Silicon chloride. of 70%, 20～65%
Germanium tetrachloride and 0～the C of 10%2F6Put in the quartz ampoule in step A, utilize plasma
Body chemical vapor phase growing process deposits 300～1200 times, form annular sandwich layer (2)；
C, percent travel according to effusion meter, by 50～the Silicon chloride. of 80%, 10～20%
The phosphorus oxychloride and 0～the C of 10% of germanium tetrachloride, 10～30%2F6Put into the stone in step B
Ying Guanzhong, utilizes plasma activated chemical vapour deposition process deposits 200～6000 times, in formation
Pericardial layer (1)；
D, will be formed with surrounding layer (4), annular sandwich layer (2) and the stone of middle pericardial layer (1)
Pyrographite induction furnace put into by English pipe, and this quartz ampoule is molten at a temperature of 2000 DEG C～2400 DEG C
Contracting forms solid mandrel；Solid mandrel is processed to form OAM Transmission Fibers prefabricated rods；Pass through
Wire-drawer-tower carries out wire drawing to OAM Transmission Fibers prefabricated rods and coats external coating, forms OAM
Transmission Fibers；Described OAM Transmission Fibers is less than at the attenuation quotient of 1550nm wavelength
2.0dB/km, OAM Transmission Fibers can support that the OAM pattern on more than +/-4 rank is transmitted,
OAM mode-coupling resonat <-20dB/km.
2. the manufacture method of OAM Transmission Fibers as claimed in claim 1, its feature exists
In: described in step D, solid mandrel is processed to form OAM Transmission Fibers prefabricated rods include with
Lower step: solid mandrel melted set quartz ampoule is formed OAM Transmission Fibers prefabricated rods.
3. the manufacture method of OAM Transmission Fibers as claimed in claim 1, its feature exists
In: described in step D, solid mandrel is processed to form OAM Transmission Fibers prefabricated rods include with
Lower step: solid mandrel is ground formation OAM Transmission Fibers prefabricated rods.
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| CN105242347B (en) * | 2015-10-13 | 2018-05-15 | 华南理工大学 | A kind of high-purity, the orbital angular momentum Transmission Fibers of low intrinsic crosstalk |
| CN105866881B (en) * | 2016-06-01 | 2021-12-24 | 上海交通大学 | Ring auxiliary type few-mode optical fiber for non-coupling mode division multiplexing transmission and transmission method thereof |
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| CN109100827A (en) * | 2018-07-13 | 2018-12-28 | 上海大学 | A kind of optical fiber and preparation method thereof kept for vortex beams transmission |
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