Organosilicon-rare earth derivatives and their synthesis methods and applications in the preparation of rare earth doped optical fibers
A rare earth doping and silicone technology, applied in the field of optical fiber manufacturing, can solve the problems of easy introduction of impurities, difficulty in quantitative control of doping content, difficulty in overcoming uneven doping of preform rods, etc.
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Embodiment 1
[0033] This embodiment provides an organosilicon-rare earth derivative, the general chemical structure of which is shown in formula 4, which is prepared by the reaction of vinyltriethoxysilane and erbium chloride, and the chemical reaction formula is shown in formula 5.
[0034]
[0035] The specific preparation process of the above-mentioned organosilicon-rare earth derivatives, the steps are as follows:
[0036] (1) Get a dry 500ml single-mouth ground flask, add a tetrafluoro stirring paddle; add erbium chloride 0.2mol, 54.75g, solvent cyclohexane 2mol, 168g in the flask, fully stir and dissolve, and obtain a molar concentration of 10% Erbium chloride solution;
[0037] (2) After pre-drying, N 2 Fully replaced 1000ml three-neck bottle, in N 2 Under protection, add 0.2 mol of vinyltriethoxysilane, 38g, and heat to 50°C; then, dropwise add the erbium chloride solution obtained in step (1) into the three-necked flask, and finish adding in about 1 hour, and continue the rea...
Embodiment 2
[0040] This embodiment provides an organosilicon-rare earth derivative, the general chemical structure of which is shown in formula 6, which is prepared by the reaction of tetramethyltetravinylcyclotetrasiloxane and ytterbium octanoate, and the chemical reaction equation is shown in formula 7 Show.
[0041]
[0042] The specific preparation process of the above-mentioned organosilicon-rare earth derivatives, the steps are as follows:
[0043](1) Get a dry 500ml single-mouth ground flask, add a tetrafluoro stirring blade; add ytterbium octanoate 0.2mol, 120.4g, solvent cyclohexane 2mol, 168g in the flask, fully stir and dissolve, and obtain a molar concentration of 10%. Ytterbium octanoate solution;
[0044] (2) After pre-drying, N 2 In a fully replaced 1000ml three-necked bottle, in N 2 Add 0.2mol, 68.8g, of tetramethyltetravinylcyclotetrasiloxane under protection, and heat to 50°C; then, dropwise add the ytterbium octanoate solution obtained in step (1) into the three-n...
Embodiment 3
[0047] Using organic silicon-rare earth derivatives with chemical structures such as Formula 4 as raw materials (both silicon sources and rare earth raw materials), the conventional MCVD process is used to produce erbium-doped optical fiber preforms. The production process is as follows:
[0048] Prepare a 1200mm quartz liner, and perform flame polishing between 1900°C and 2100°C to eliminate defects such as scratches, impurities, and bubbles on the inner wall of the liner, and deposit 10- 15 layers with SiO 2 -P 2 o 5 - The inner cladding layer of -F is reverse-deposited between 1530°C and 1580°C, and the gas-deposited loose core layer of organic silicon-rare earth derivatives with a chemical structure such as formula 4 is introduced, and then passed between 1150°C and 1200°C He,O 2 , Cl 2 The loose core layer is dehydrated, and finally the quartz tube is melted and shrunk into a solid preform rod at 2220°C-2300°C.
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