Method of producing light guides based on deuterium-alloyed quartz glass

FIELD: chemistry.

SUBSTANCE: dry, deuterium-containing gases, for example dimethylsulphoxide D6 vapours, are introduced into a tube of a fibrous light guide workpiece. Alloying of precipitable layers of a glass core and envelope with small additions of deuterium is carried out both in the process of the layer precipitation and at high-temperature tube compression.

EFFECT: reduction of the light guide optical loss and mass loss of workpieces, reduction of thereof production process duration.

2 cl, 1 tbl

 

The invention relates to fiber optics, in particular to the manufacture of optical fibers (SU) modified chemical vapor deposition (modified chemical vapor deposition - MCVD). Optical fiber produced by this method, different additional optical losses in the spectral region of transparency of quartz glass (1300-1550 nm) due to the radiation absorption of the impurity hydroxyl groups in which hydrogen atoms are contained in the form is widely distributed in nature isotopes - protium (H).

The core of the sun, produced by MCVD method, surrounded by reflective synthetic sheath that isolates the core from impurities reference material quartz tubes industrial production. The admixture of hydrogen creates major problems in the technology of the sun, as it has the highest diffusion mobility in comparison with other impurities. When protium penetrates germanosilicate the core, the reaction occurs recovery GeO2:

It results in additional optical losses throughout the spectral region of transparency of the glass, especially at a wavelength of 1.38 μm, corresponding to the position of the peak of the main absorption overtone vibrations of the associated atoms of protium and oxygen (A. Iino, M. Kuwabara, K. Kokura Mechanism of hydrogen-induced loss in silica-based optical fibers. - Journal of lighwave technology. 1990, v. 8, No. 11, p. 1675-1679).

Treatment with deuterium source quartz tubes used in the MCVD process for the manufacture of sun, resolves in optical fibers, the absorption at the wavelength of 1.38 μm, thus shifting the absorption band in the region of 1.9 μm due to the isotopic exchange of protium by deuterium (Shang N. T., Stone J., Burrus, S. A. Low - HE MCVD fibers without a barrier layer using the OH-OD exchange substrate tubes. - Electronics letters. 1983, v 19, No. 3, p. 95-96). However, the additional optical loss due to the recovery of GeO2not removed: deuterium and protium, at high temperature diffuses into germanosilicate glass core and restores dioxide Germany.

Closest to the proposed technical solution "Method of making fibers based on quartz glass with low optical losses," RF patent for the invention №2462737, published on 03.03.2011 by index IPC G02B 6/024; SV 37/18, taken as a prototype. This way made the sun MCVD method based on silica glass, optionally doped by small additions of deuterium oxide during the high-temperature compression of the tube. This eliminates optical losses due to the recovery of GeO2. Deuterium is introduced to the grid of the glass according to the reaction:

Formed according to reaction (2) OD group rip regular Si-O glass connection, lowering its viscosity, and slip the reaction� (1) to the left side, thereby reducing the degree of recovery GeO2and additional optical losses.

The use of this solution for MCVD method of manufacturing the sun has a major drawback:

- recommended this patent supplements of deuterium oxide can be used only during the high-temperature compression of the tube, thereby providing the desired effect only for singlemode sun with a small core diameter. The introduction of deuterium oxide in the gas-vapor mixture (ASG) during the deposition of the doped layers of the shell and the core is not feasible, since the reagents interact with D2O at room temperature and block line feed calibration gas solid products of hydrolysis.

The object of the present invention is to improve the manufacturing technology of quartz fiber sun doped with deuterium, which allows the fabrication of multimode and single-mode optical fibers with low optical losses, increase productivity for manufacturing workpieces with the increase of their diameter.

The technical result is achieved in that the deuterium is introduced into the glass during the deposition of the layers, and compression of the tube. As a result:

- decreases the viscosity of the glass core and cladding for multimode and singlemode sun, resulting in a reduction of optical losses on adjusting�Fairplay scattering;

- by reducing the duration of high-temperature compression improves the performance of the manufacturing process of the workpiece and increases the diameter of the blanks due to the reduction of massonica glass.

The problem is solved by a new method of manufacturing the armed forces on the basis of quartz glass doped with deuterium, including the processes of manufacture of the optical fiber MCVD method with doping of deposited layers of glass with deuterium and follow the sun hood, which, unlike the prototype, the deuterium is introduced in the deposition process of the layers of the shell and the core, and at high temperature compression tube, and as lateristriga reagents used dry (dew point less than -50°C) lateristriga gases or vapors of volatile substances, such as dimethyl sulfoxide D6 (C2D6SO), the content of oxygen lower explosive limit of the mixture.

Improvement of manufacturing technology SA is that the introduction of such additives provides the solution to these problems, allowing you to alloy deuterium both singlemode and multimode fibers. Formed in the deposited glass OD group reduce its viscosity, thereby reducing optical losses by Rayleigh scattering and reduction in the duration of high-temperature compression process tube.Limit of moisture content in lateristriga substances (to a dew point of less than -50°C) due to which when administered in ASG halides (SiCl4, GeCl4, POCl3, BCl3interact with moisture at room temperature and block line of reagent solid products of hydrolysis (SiO2, GeO2, R2O5and In2O3).

The sum total of the characteristics and analysis of the differences from the prototype on the existing level of technology allows to make a conclusion about the "novelty" and "inventive step" of the new method.

The proposed new solution is implemented experimentally in the following examples, the method of manufacture of the aircraft.

Example No. 1. The known MCVD technology manufactured multimode sun during heating source rotating tube the oxygen-hydrogen torch, reciprocating movement. On the inner surface of the meter tube of quartz glass with an outer diameter of 22 mm, a wall thickness of 2.1 mm MCVD method was applied 10 layers of protective membranes (0,963 SiO2-0,03 P2O5-0,007 (F), 4 layers of insulating sheathing (0,973 SiO2to -0.02 GeO2-0,007 (F) and layer 2 core (0,948 SiO2to -0.05 GeO2-0,002 (F). In the process of deposition of glass layers and the compression tube in the line of reagent was injected bypass oxygen after bubbling through the liquid dimethyl sulfoxide D6 (D6 LCA) at 25°C. the content of oxygen in the calibration gas during the deposition of all layers was about 0.05. %, and in the process� compression - about 0.1. %. High-temperature compression of a tube in a rod-made in two passes of the burner at temperatures of 2000°C and 2150°C. In the second pass of the burner in the opposite direction of its motion and the velocity of 10 mm/min inner channel was shut. Received round blank with an outer diameter equal to 12.5 mm and a diameter of germanosilicate core ≈0.7 mm. the refractive Index (PP) all shells matched to claims of quartz glass supporting the quartz tube. The difference between PP core and an insulating sheath, measured on the Refractometer R-101, equal 0,0065.

From the thus obtained preform is pulled singlemode VS No. 1 with a diameter of 125 μm and a length of 1 km when the billet heating up to 2000°C in a furnace with a graphite heater. In the process of pulling the fiber is covered with a layer of soft and hard epoxyacrylate polymer, cured by ultraviolet irradiation. The diameter of the sun in the double coating was 250 μm. Wavelength cutoff of the highest fashion ≈1,38 mm.

Example No. 2. Similarly, the fabricated sample VS No. 2, differs from the previous method in that for receiving multimode sun was precipitated from 2 to 20 layers of the core. Return speed of the burner due to the collapse of the inner channel was 11 mm/min. Obtained round blank with an outer diameter equal to 12.8 mm and the same PP value of the core and about�lock with a core diameter of ≈2.2 mm.

From the thus obtained preform is pulled mnogomodovyj sun No. 2 with a diameter of 125 μm and a length of 2 km. In the process of pulling the fiber is covered with a layer of soft and hard epoxyacrylate polymer, cured by ultraviolet irradiation. The diameter of the optical fiber in a double coating was 250 µm.

Example No. 3. Similarly made a control sample of single-mode SA No. 3 differs from example 1 by the fact that LCA D6 not used in the manufacturing process of the workpiece. During high-temperature compression tube was flushed with oxygen that passed through the catalytic combustion of hydrogen-containing impurities and dried on a molecular sieve. The concentration of hydrogen impurities in oxygen, subjected to this treatment did not exceed 10-4mol. %. The travel speed of the torch during the collapse of the inner channel in this way was 40% lower (6 instead of 10 mm/min) than in example No. 1. This is due to the increased viscosity of the core material and the shell due to the lack of OD groups in the glass. The outer diameter of the workpiece is equal to 11.9 mm, 0.6 mm less than in example 1 due to increased evaporation of the glass by increasing the duration of high-temperature compression of the tube.

From billet extended single-mode SA No. 3 with a diameter of 125 μm and a length of 1 km. In the process of pulling the fiber is covered with a layer of soft chiffon.� and hard epoxyacrylate polymer, cured by ultraviolet irradiation. The diameter of the sun in the double coating was 250 μm. Wavelength cutoff of the highest fashion ≈1,45 mm.

Example No. 4. Similarly, control sample made multimode VS No. 4 kilometer length, which differs from example No. 2 the fact that LCA D6 not used in the manufacturing process of the workpiece. During high-temperature compression tube was flushed with oxygen, the concentration of hydrogen-containing impurities in which not more than 10-4mol. %. The travel speed of the torch during the collapse of the inner channel in this method was 36% lower (7 instead of 11 mm/min) than in example No. 2. This is due to the increased viscosity of the precipitated glass due to the lack of OD groups in it. Received round blank with outer diameter equal to 12.3 mm and the core diameter ≈2.2 mm under the same values of PP cores and shells.

The table is mapped to the optical loss at the wavelength of 1.55 µm for MO, obtained at different concentrations of D6 LCA in the gas phase at high-temperature compression of the workpiece.

With increasing content of deuterium in the gas phase inside the support tube of the optical losses of the armed forces are reduced due to the lower viscosity of the glass and, consequently, decreasing the magnitude of Rayleigh scattering. Reduced the mass of the evaporated glass read more�tirovaca 4-5%.

The above data confirm the obvious industrial applicability of the proposed method of manufacture of the aircraft for use in communication systems and fiber optic sensors.

1. The method of manufacture of optical fibers based on silica glass doped with deuterium, including the processes of manufacture of the optical fiber preform by modified chemical vapor deposition of doped quartz glass with a doping of deposited layers of glass with deuterium and follow the sun hood, characterized in that the deuterium is introduced in the deposition process of the layers of the shell and the core, and at high temperature compression tube, and use dry with a dew point of less than -50°C lateristriga gases, the content of oxygen less than the lower explosive limit of the mixture.

2. A method according to claim 1, characterized in that as lateristriga gas used pair of dimethyl sulfoxide D6 (C2D6SO).



 

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