Optical fiber eat treatment method and device
A heat treatment method and technology of heat treatment device, which are applied in glass manufacturing equipment, glass production, manufacturing tools, etc., can solve the problem of unspecified holding time and holding furnace temperature setting, unspecified length of temperature zone, optical fiber processing time, complicated application, etc. problem, to achieve the effect of reducing Rayleigh backscattering loss, reducing small density changes, and reducing attenuation coefficient
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[0026] The optical fiber corresponding to Example 1 is a PCVD method to prepare a core rod, and an OVD method to prepare a cladding germanium-fluorine doped matched cladding single-mode fiber. The length and temperature parameters of the holding furnace are selected so that the temperature of the optical fiber is maintained at the required temperature for a period of time. Specifically, the furnace cavity of the holding furnace is divided into two temperature control zones, each of which has a length of 1 m; the temperature of the first zone and the second zone are respectively 850°C and 1050°C. The drawing speed is set to 1300m / min, the total residence time of the optical fiber in the holding furnace is about 0.09s, and the residence time in each temperature control zone is about 0.045s. The surface temperature of the optical fiber entering the holding furnace is 1476°C, and the surface temperature of the optical fiber leaving the holding furnace is 1156°C. The average coolin...
Example Embodiment
[0029] The optical fiber corresponding to Example 2 is a PCVD method to prepare a core rod, and an OVD method to prepare a cladding germanium-fluorine doped matching cladding single-mode fiber. The drawing speed is set to 1500m / min, and the temperature at which the optical fiber enters the holding furnace is 1511°C. The length and temperature parameters of the holding furnace are selected so that the temperature of the optical fiber is maintained at the required temperature for a period of time. Specifically, the thermal division of the holding furnace is divided into 3 zones, each of which has a length of 1 m; the temperatures of the first to third zones are 800°C, 950°C, and 1050°C, respectively. In this way, the total residence time of the optical fiber in the holding furnace is about 0.12s, and the residence time in each hot zone is about 0.04s. The surface temperature of the optical fiber when it leaves the holding furnace is 1163°C. The average cooling rate in the holdi...
Example Embodiment
[0033] The optical fiber corresponding to Example 3 is a PCVD method to prepare a core rod, and an OVD method to prepare a cladding germanium-fluorine doped matched cladding single-mode fiber. The drawing speed is set to 1800m / min, and the temperature at which the optical fiber enters the holding furnace is 1564°C. The length and temperature parameters of the holding furnace are selected so that the temperature of the optical fiber is maintained at the required temperature for a period of time. Specifically, the thermal division of the holding furnace is divided into 3 zones, each of which has a length of 1 m; the temperatures of the first to third zones are 750°C, 950°C, and 1050°C, respectively. In this way, the total residence time of the optical fiber in the holding furnace is about 0.1s, and the residence time in each hot zone is about 0.033s. The surface temperature of the optical fiber when it leaves the holding furnace is 1158°C. The average cooling rate in the holdin...
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