CN104003614A - OAM transmission fiber and manufacturing method thereof - Google Patents
OAM transmission fiber and manufacturing method thereof Download PDFInfo
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- CN104003614A CN104003614A CN201410195087.2A CN201410195087A CN104003614A CN 104003614 A CN104003614 A CN 104003614A CN 201410195087 A CN201410195087 A CN 201410195087A CN 104003614 A CN104003614 A CN 104003614A
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- C03—GLASS; MINERAL OR SLAG WOOL
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- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre 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
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- 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 an OAM transmission fiber and a manufacturing method thereof, which relates to the field of optical fiber communication. The method comprises the following steps: successively forming an external cladding, an annular core layer and a central cladding through deposition by using a plasma chemical vapor deposition process; carrying out melting polycondensation at a temperature of 2000 to 2400 DEG C and then carrying out processing so as to form an OAM transmission fiber preform; and subjecting the OAM transmission fiber preform to wire drawing and coating of an outer coating so as to prepare the OAM transmission fiber. The OAM transmission fiber has an attenuation coefficient of less than 2.0 dB/km at a wavelength of 1550 nm and can support OAM mode transmission of more than +/- 4 orders, and OAM mode coupling is less than -20 dB/km. The OAM transmission fiber can meet requirements of high-capacity transmission of the OAM fiber on the waveguide structure of the fiber and substantially expand OAM mode transmission capacity in the fiber and is convenient to use by people.
Description
Technical field
The present invention relates to fiber optic communication field, relate in particular to a kind of OAM (Orbital Angular Momentum, orbital momentum) Transmission Fibers and manufacture method thereof.
Background technology
Along with social progress, information technology has become one of the most important productivity of socio-economic development source, the lasting expansion of infosystem capacity is that social informatization develops requisite demand, and the development space of infosystem capacity and the potential information demand not discharging are very huge.
In fibre system communication, energy, linear momentum and the polarization state to photon analyzed decoding can obtain the entrained information of photon.The capacity of optical communication system has experienced WDM (Wavelength Division and Multiplexing, wavelength-division multiplex) improve after rate of increase, the rate of growth of the capacity of optical communication system has fallen back to approximately annual 0.5dB (or 12%), and the average growth rate of the spectrum effectiveness of optical communication system is approximately annual 1dB.
The progress of optical communication technique thereupon, another physical quantity OAM (orbital angular momentum, orbital momentum) of photon is by extensive concern, and OAM is systematically used in communication so far not yet.Utilize the exponent number value l of this group hertzian wave eigenmodes of OAM pattern, modulate or multiplexing parameter dimensions resource (utilizing different l values to represent different coding state or different information channel) as new supplying, can serve as the new way of further raising spectrum effectiveness.Because l value has unlimited span, can there are in theory the potentiality of the quantity of information of unlimited increase photon or hertzian wave carrying.
Due to the dimension of hertzian wave OAM, with at present for belonging to orthogonality relation between the dimensions such as the frequency of communicating by letter, propagation direction phase place, amplitude, therefore for the various types of optical fiber of existing communication technology manufacturing, OAM signal light intensity distributes and meets Gauss-Laguerre beam characteristics, the transmission in height of center specific refractory power waveguiding structure of OAM signal can cause serious pattern to crosstalk, and is difficult to realize the large volume transport of OAM pattern.
Boston Univ USA and University of Southern California have realized the multiplexing of special optical fiber OAM information that length is 1.1km in 2012, but, because the transmission mode of described special optical fiber is subject to the restriction of fibre-optic waveguide structure, so described special optical fiber only can transmit 4 orbital momentum patterns (being l=4); Therefore the transmission capacity of described special optical fiber is less, is not easy to people and uses.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of OAM Transmission Fibers and manufacture method thereof, not only can meet the requirement of the large volume transport of OAM optical fiber to fibre-optic waveguide structure, and can expand in a large number OAM mode transfer capacity in optical fiber, be convenient to people and use.
For reaching above object, the technical scheme that the present invention takes is: a kind of manufacture method of OAM Transmission Fibers, comprises the following steps:
A, according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% hexafluoroethane C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 600～4800 times, form surrounding layer;
B, according to the aperture per-cent of under meter, by 30～70% silicon tetrachloride, 20～65% germanium tetrachloride and 0～10% C
2f
6put into the silica tube of steps A, utilize plasma activated chemical vapour deposition process deposits 300～1200 times, form annular sandwich layer;
C, according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% C
2f
6put into the silica tube of step B, utilize plasma activated chemical vapour deposition process deposits 200～6000 times, pericardial layer in formation;
D, the silica tube that is formed with surrounding layer, annular sandwich layer and middle pericardial layer is put into pyrographite induction furnace, the molten contracting at the temperature of 2000 DEG C～2400 DEG C of this silica tube forms solid mandrel; Solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods; By wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers; Described OAM Transmission Fibers is less than 2.0dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, OAM intermode coupling <-20dB/km.
On the basis of technique scheme, described in step D, solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods and comprises the following steps: solid mandrel melting cover silica tube is formed to OAM Transmission Fibers prefabricated rods.
On the basis of technique scheme, described in step D, solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods and comprises the following steps: solid mandrel is ground and forms OAM Transmission Fibers prefabricated rods.
On the basis of technique scheme, silicon tetrachloride described in steps A is 70%, and germanium tetrachloride is 15%, and phosphorus oxychloride is 12%, C
2f
6be 5%, deposition number is 1500 times.
On the basis of technique scheme, silicon tetrachloride described in step B is 40%, and germanium tetrachloride is 60%, C
2f
6be 1%, deposition number is 350 times.
On the basis of technique scheme, silicon tetrachloride described in step C is 70%, and germanium tetrachloride is 15%, and phosphorus oxychloride is 12%, C
2f
6be 5%, deposition number is 4750 times.
An OAM Transmission Fibers of manufacturing according to above-mentioned manufacture method, is characterized in that: described OAM Transmission Fibers comprises the middle pericardial layer setting gradually from the inside to the outside, annular sandwich layer and surrounding layer; The ratio of the radius of described middle pericardial layer and the radius of annular sandwich layer is 1～52.5:1, and the ratio of the radius of described surrounding layer and the radius of annular sandwich layer is 0.5～60.5:1;
The specific refractory power of described middle pericardial layer is identical with the specific refractory power of surrounding layer; The maximum refractive index of described annular sandwich layer is greater than the specific refractory power of middle pericardial layer, and the maximum refractive index of annular sandwich layer is greater than the specific refractory power of surrounding layer; The lowest refractive index of described annular sandwich layer is less than the specific refractory power of middle pericardial layer, and the lowest refractive index of annular sandwich layer is less than the specific refractory power of surrounding layer;
The refractive index contrast of the maximum refractive index of annular sandwich layer and middle pericardial layer is defined as to Δ n
1%; The refractive index contrast of the maximum refractive index of annular sandwich layer and surrounding layer is defined as to Δ n
2%; The refractive index contrast of the lowest refractive index of annular sandwich layer and middle pericardial layer is defined as to Δ n
3%; Δ n
1% and Δ n
2% is identical, be 0.10%～1.90%, Δ n
3% is 0.01%～0.09%.
On the basis of technique scheme, in described annular sandwich layer, be provided with grading structure layer, the starting point specific refractory power of grading structure layer and middle pericardial layer refractive index contrast are defined as to Δ n
4%, the starting point specific refractory power of described grading structure layer and the refractive index contrast of surrounding layer, with Δ n
4% is identical, Δ n
4% is 0.01%～0.06%; The refractive index curve fit slope of described grading structure layer is 0.7.
On the basis of technique scheme, the ratio of the radius of described middle pericardial layer and the radius of annular sandwich layer is 52.5:1, and the ratio of the radius of described surrounding layer and the radius of annular sandwich layer is 4.2:1; Described Δ n
1% and Δ n
2% is 0.10%, described Δ n
3% is 0.01%, described Δ n
4% is 0.01%.
On the basis of technique scheme, the ratio of the radius of described middle pericardial layer and the radius of annular sandwich layer is 1:1, and the ratio of the radius of described surrounding layer and the radius of annular sandwich layer is 60.5:1; Described Δ n
1% and Δ n
2% is 1.90%, described Δ n
3% is 0.09%, described Δ n
4% is 0.06%.
Compared with prior art, the invention has the advantages that:
(1) OAM Transmission Fibers of the present invention can adapt to the space phase distribution character of OAM pattern, realizes the high-fidelity transmission of OAM pattern.
(2) the present invention utilizes the accurate profile control ability of plasma activated chemical vapour deposition technique, can directly realize and design the annular fibre core formula waveguiding structure mating, and effectively solves the doping problem of specific position in OAM Transmission Fibers covering.Therefore, the present invention can meet the requirement of the large volume transport of OAM optical fiber to fibre-optic waveguide structure.
(3) the present invention is by plasma activated chemical vapour deposition technique, and the concentric type that can realize multiple annular core structures in fibre cladding region distributes, and can ensure the integrity of the complicated cross-section structure of OAM Transmission Fibers of multiple concentric distributions.Therefore, the present invention can expand OAM mode transfer capacity in optical fiber in a large number, is convenient to people and uses.
(4) specific refractory power of the little surrounding layer of the lowest refractive index of annular sandwich layer of the present invention, middle pericardial layer, and then can reduce the power density of core region in signals transmission, suppress the signal distortion that non-linear effect causes.
(5) the OAM Transmission Fibers of manufacturing by method of the present invention is less than 2.0dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, OAM intermode coupling <-20dB/km.Therefore, OAM Transmission Fibers possesses good optical property and reliability, and its quality is better.
Brief description of the drawings
Fig. 1 is the schema 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 diagrammatic cross-section in the embodiment of the present invention.
In figure: pericardial layer in 1-, 2-annular sandwich layer, 3-grading structure layer, 4-surrounding layer.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shown in Figure 1, the manufacture method of OAM (Orbital Angular Momentum, the orbital momentum) Transmission Fibers that the embodiment of the present invention provides, comprises the following steps:
S1: according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% C
2f
6(hexafluoroethane) puts into silica tube, utilizes plasma activated chemical vapour deposition process deposits 600～4800 times, forms surrounding layer 4.
Silicon tetrachloride in step S1 can be 70%, and germanium tetrachloride can be 15%, and phosphorus oxychloride can be 12%, C
2f
6can be 5%, deposition number can be 1500 times.
S2: according to the aperture per-cent of under meter, by 30～70% silicon tetrachloride, 20～65% germanium tetrachloride and 0～10% C
2f
6put into the silica tube of step S1, utilize plasma activated chemical vapour deposition process deposits 300～1200 times, form annular sandwich layer 2.
Silicon tetrachloride in step S2 can be 40%, and germanium tetrachloride can be 60%, C
2f
6can be 1%, deposition number can be 350 times.
S3: according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% C
2f
6put into the silica tube of step S2, utilize plasma activated chemical vapour deposition process deposits 200～6000 times, pericardial layer 1 in formation.
Silicon tetrachloride in step S3 can be 70%, and germanium tetrachloride can be 15%, and phosphorus oxychloride can be 12%, C
2f
6can be 5%, deposition number can be 4750 times.
In the process of formation of deposits surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1, the number of specific deposition raw material, flow proportional and deposition, not only can gate ring core layer 2 with the refractive index contrast of surrounding layer 4, middle pericardial layer 1, and can control the radius ratio of surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1.
S4: the silica tube that is formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1 is put into pyrographite induction furnace, and the molten contracting at the temperature of 2000 DEG C～2400 DEG C of this silica tube forms solid mandrel; Solid mandrel is processed to form to the OAM Transmission Fibers prefabricated rods of counter structure.
Solid mandrel is added to man-hour, solid mandrel melting cover silica tube can be formed to OAM Transmission Fibers prefabricated rods, also solid mandrel can be ground and form OAM Transmission Fibers prefabricated rods.
S5: by wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers.OAM Transmission Fibers is less than 2.0dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, OAM intermode coupling <-20dB/km.
Shown in Figure 2, the embodiment of the present invention provides the OAM Transmission Fibers of manufacturing based on above-mentioned manufacture method, for OAM mode signaling.OAM Transmission Fibers comprises the middle pericardial layer 1, annular sandwich layer 2 and the surrounding layer 4 that set gradually from the inside to the outside.The ratio of the radius of the radius of middle pericardial layer 1 and annular sandwich layer 2 is 1～52.5:1, is preferably 52.5:1 or 1:1; The ratio of the radius of the radius of surrounding layer 4 and annular sandwich layer 2 is 0.5～60.5:1, is preferably 4.2:1 or 60.5:1.
Shown in Figure 3, the specific refractory power of middle pericardial layer 1 is identical with the specific refractory power of surrounding layer 4.The maximum refractive index of annular sandwich layer 2 is greater than the specific refractory power of middle pericardial layer 1, and the maximum refractive index of annular sandwich layer 2 is greater than the specific refractory power of surrounding layer 4.The lowest refractive index of annular sandwich layer 2 is less than the specific refractory power of middle pericardial layer 1, and the lowest refractive index of annular sandwich layer 2 is less than the specific refractory power of surrounding layer 4.
The refractive index contrast of the maximum refractive index of annular sandwich layer 2 and middle pericardial layer 1 is defined as to Δ n
1%, is defined as Δ n by the refractive index contrast of the maximum refractive index of annular sandwich layer 2 and surrounding layer 4
2%, is defined as Δ n by the refractive index contrast of the lowest refractive index of annular sandwich layer 2 and middle pericardial layer 1
3%.Δ n
1% and Δ n
2% is identical, be 0.10%～1.90%, Δ n
1% and Δ n
2% is preferably 0.10% or 1.90%; Δ n
3% is 0.01%～0.09%, is preferably 0.01% or 0.09%.
In annular sandwich layer 2, be provided with grading structure layer 3, the starting point specific refractory power of grading structure layer 3 and middle pericardial layer 1 refractive index contrast are defined as to Δ n
4%, the starting point specific refractory power of grading structure layer 3 and the refractive index contrast of surrounding layer 4, with Δ n
4% is identical.Δ n
4% is 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 at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, OAM intermode coupling <-20dB/km.
Describe OAM Transmission Fibers of the present invention and manufacture method thereof in detail below by 3 embodiment.
Embodiment 1
According to the aperture per-cent of under meter, by 70% silicon tetrachloride, 20% germanium tetrachloride, 10% phosphorus oxychloride and 5% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 1500 times, form surrounding layer 4.
According to the aperture per-cent of under meter, by 70% silicon tetrachloride, 65% germanium tetrachloride and 1% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 350 times, form annular sandwich layer 2.
According to the aperture per-cent of under meter, by 70% silicon tetrachloride, 20% germanium tetrachloride, 10% phosphorus oxychloride and 5% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 4750 times, pericardial layer 1 in formation.
The silica tube that is formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1 is put into pyrographite induction furnace, and the molten contracting at the temperature of 2200 DEG C of this silica tube forms solid mandrel.Solid mandrel melting cover silica tube is formed to the OAM Transmission Fibers prefabricated rods of counter structure; By wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers.
The OAM Transmission Fibers that embodiment 1 manufactures is 1.92dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-22 rank, be coupled as-20dB/km of OAM intermode.
The diameter of the quartzy covering of OAM Transmission Fibers is 125 μ m, and the thickness of annular fibre core is 4.0 μ m, and the diameter of coating is 244 μ m; The ratio of the radius of the middle pericardial layer 1 of OAM Transmission Fibers and the radius of annular sandwich layer 2 is 52.5:1, and the ratio of the radius of the radius of surrounding layer 4 and annular sandwich layer 2 is 4.2:1; Δ n
1% and Δ n
2% is 0.10%, Δ n
3% is 0.01%, Δ n
4% is 0.01%, and the refractive index curve fit slope of grading structure layer 3 is 0.7.
Embodiment 2
According to the aperture per-cent of under meter, 80% silicon tetrachloride, 10% germanium tetrachloride and 30% phosphorus oxychloride are put into silica tube, utilize plasma activated chemical vapour deposition process deposits 4800 times, form surrounding layer 4.
According to the aperture per-cent of under meter, the germanium tetrachloride of 30% silicon tetrachloride and 20% is put into silica tube, utilize plasma activated chemical vapour deposition process deposits 300 times, form annular sandwich layer 2.
According to the aperture per-cent of under meter, 80% silicon tetrachloride, 10% germanium tetrachloride and 30% phosphorus oxychloride are put into silica tube, utilize plasma activated chemical vapour deposition process deposits 200 times, pericardial layer 1 in formation.
The silica tube that is formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1 is put into pyrographite induction furnace, and the molten contracting at the temperature of 2000 DEG C of this silica tube forms solid mandrel.Solid mandrel is ground to the OAM Transmission Fibers prefabricated rods that forms counter structure; By wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers.
The OAM Transmission Fibers that embodiment 2 manufactures is 2.0dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, be coupled as-22dB/km of OAM intermode.
The diameter of the quartzy covering of OAM Transmission Fibers is 125 μ m, and the thickness of annular fibre core is 2.0 μ m, and the diameter of coating is 244 μ m; The ratio of the radius of the middle pericardial layer 1 of OAM Transmission Fibers and the radius of annular sandwich layer 2 is 1:1, and the ratio of the radius of the radius of surrounding layer 4 and annular sandwich layer 2 is 60.5:1.Δ n
1% and Δ n
2% is 1.90%, Δ n
3% is 0.09%, Δ n
4% is 0.06%, and the refractive index curve fit slope of grading structure layer 3 is 0.7.
Embodiment 3
According to the aperture per-cent of under meter, by 50% silicon tetrachloride, 15% germanium tetrachloride, 12% phosphorus oxychloride and 10% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 600 times, form surrounding layer 4.
According to the aperture per-cent of under meter, by 40% silicon tetrachloride, 60% germanium tetrachloride and 10% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 1200 times, form annular sandwich layer 2.
According to the aperture per-cent of under meter, by 50% silicon tetrachloride, 15% germanium tetrachloride, 12% phosphorus oxychloride and 10% C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 6000 times, pericardial layer 1 in formation.
The silica tube that is formed with surrounding layer 4, annular sandwich layer 2 and middle pericardial layer 1 is put into pyrographite induction furnace, and the molten contracting at the temperature of 2400 DEG C of this silica tube forms solid mandrel.Solid mandrel is ground to the OAM Transmission Fibers prefabricated rods that forms counter structure; By wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers.
The OAM Transmission Fibers that embodiment 3 manufactures is 1.90dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, be coupled as-20dB/km of OAM intermode.
The diameter of the quartzy covering of OAM Transmission Fibers is 125 μ m, and the thickness of annular fibre core is 2.0 μ m, and the diameter of coating is 245 μ m; The ratio of the radius of the middle pericardial layer 1 of OAM Transmission Fibers and the radius of annular sandwich layer 2 is 10:1, and the ratio of the radius of the radius of surrounding layer 4 and annular sandwich layer 2 is 0.5:1.Δ n
1% and Δ n
2% is 1.50%, Δ n
3% is 0.04%, Δ n
4% 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, under the premise without departing from the principles of the invention, can also make some improvements and modifications, within these improvements and modifications are also considered as protection scope of the present invention.The content not being described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. a manufacture method for OAM Transmission Fibers, is characterized in that, comprises the following steps:
A, according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% hexafluoroethane C
2f
6put into silica tube, utilize plasma activated chemical vapour deposition process deposits 600～4800 times, form surrounding layer (4);
B, according to the aperture per-cent of under meter, by 30～70% silicon tetrachloride, 20～65% germanium tetrachloride and 0～10% C
2f
6put into the silica tube of steps A, utilize plasma activated chemical vapour deposition process deposits 300～1200 times, form annular sandwich layer (2);
C, according to the aperture per-cent of under meter, by 50～80% silicon tetrachloride, 10～20% germanium tetrachloride, 10～30% phosphorus oxychloride and 0～10% C
2f
6put into the silica tube of step B, utilize plasma activated chemical vapour deposition process deposits 200～6000 times, pericardial layer in formation (1);
D, the silica tube that is formed with surrounding layer (4), annular sandwich layer (2) and middle pericardial layer (1) is put into pyrographite induction furnace, the molten contracting at the temperature of 2000 DEG C～2400 DEG C of this silica tube forms solid mandrel; Solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods; By wire-drawer-tower, OAM Transmission Fibers prefabricated rods carried out wire drawing and applied external coating (EC), forming OAM Transmission Fibers; Described OAM Transmission Fibers is less than 2.0dB/km at the reduction coefficient of 1550nm wavelength, and OAM Transmission Fibers can be supported OAM mode transfer more than +/-4 rank, OAM intermode coupling <-20dB/km.
2. the manufacture method of OAM Transmission Fibers as claimed in claim 1, is characterized in that: described in step D, solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods and comprises the following steps: solid mandrel melting cover silica tube is formed to OAM Transmission Fibers prefabricated rods.
3. the manufacture method of OAM Transmission Fibers as claimed in claim 1, is characterized in that: described in step D, solid mandrel is processed to form to OAM Transmission Fibers prefabricated rods and comprises the following steps: solid mandrel is ground and forms OAM Transmission Fibers prefabricated rods.
4. the manufacture method of the OAM Transmission Fibers as described in claims 1 to 3 any one,
It is characterized in that: silicon tetrachloride described in steps A is 70%, germanium tetrachloride is 15%, and phosphorus oxychloride is 12%, C
2f
6be 5%, deposition number is 1500 times.
5. the manufacture method of the OAM Transmission Fibers as described in claims 1 to 3 any one,
It is characterized in that: silicon tetrachloride described in step B is 40%, germanium tetrachloride is 60%, C
2f
6be 1%, deposition number is 350 times.
6. the manufacture method of the OAM Transmission Fibers as described in claims 1 to 3 any one, is characterized in that: silicon tetrachloride described in step C is 70%, and germanium tetrachloride is 15%, and phosphorus oxychloride is 12%, C
2f
6be 5%, deposition number is 4750 times.
7. an OAM Transmission Fibers of manufacturing according to manufacture method described in claims 1 to 3 any one, is characterized in that: described OAM Transmission Fibers comprises the middle pericardial layer (1) setting gradually from the inside to the outside, annular sandwich layer (2) and surrounding layer (4); The ratio of the radius of the radius of described middle pericardial layer (1) and annular sandwich layer (2) is 1～52.5:1, and the ratio of the radius of the radius of described surrounding layer (4) and annular sandwich layer (2) is 0.5～60.5:1;
The specific refractory power of described middle pericardial layer (1) is identical with the specific refractory power of surrounding layer (4); The maximum refractive index of described annular sandwich layer (2) is greater than the specific refractory power of middle pericardial layer (1), and the maximum refractive index of annular sandwich layer (2) is greater than the specific refractory power of surrounding layer (4); The lowest refractive index of described annular sandwich layer (2) is less than the specific refractory power of middle pericardial layer (1), and the lowest refractive index of annular sandwich layer (2) is less than the specific refractory power of surrounding layer (4);
The refractive index contrast of the maximum refractive index of annular sandwich layer (2) and middle pericardial layer (1) is defined as to Δ n
1%; The refractive index contrast of the maximum refractive index of annular sandwich layer (2) and surrounding layer (4) is defined as to Δ n
2%; The refractive index contrast of the lowest refractive index of annular sandwich layer (2) and middle pericardial layer (1) is defined as to Δ n
3%; Δ n
1% and Δ n
2% is identical, be 0.10%～1.90%, Δ n
3% is 0.01%～0.09%.
8. OAM Transmission Fibers as claimed in claim 7, it is characterized in that: in described annular sandwich layer (2), be provided with grading structure layer (3), the starting point specific refractory power of grading structure layer (3) and middle pericardial layer (1) refractive index contrast are defined as to Δ n
4%, the refractive index contrast of the starting point specific refractory power of described grading structure layer (3) and surrounding layer (4), with Δ n
4% is identical, Δ n
4% is 0.01%～0.06%; The refractive index curve fit slope of described grading structure layer (3) is 0.7.
9. OAM Transmission Fibers as claimed in claim 8, it is characterized in that: the ratio of the radius of the radius of described middle pericardial layer (1) and annular sandwich layer (2) is 52.5:1, the ratio of the radius of the radius of described surrounding layer (4) and annular sandwich layer (2) is 4.2:1; Described Δ n
1% and Δ n
2% is 0.10%, described Δ n
3% is 0.01%, described Δ n
4% is 0.01%.
10. OAM Transmission Fibers as claimed in claim 8, it is characterized in that: the ratio of the radius of the radius of described middle pericardial layer (1) and annular sandwich layer (2) is 1:1, the ratio of the radius of the radius of described surrounding layer (4) and annular sandwich layer (2) is 60.5:1; Described Δ n
1% and Δ n
2% is 1.90%, described Δ n
3% is 0.09%, described Δ n
4% is 0.06%.
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| CN106950644A (en) * | 2017-05-03 | 2017-07-14 | 华中科技大学 | A kind of weak lead ring shape structured optical fiber |
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