Method for producing low water peak single mode fiber with high efficiency

A single-mode optical fiber and low water peak technology, applied in the field of optical fiber, can solve problems such as potential safety hazards, and achieve the effects of improving processing effect, increasing diffusion rate, and good hydrogen aging resistance
CN101654328BActive Publication Date: 2011-10-26NANJING WASIN FUJIKURA OPTICAL COMM LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING WASIN FUJIKURA OPTICAL COMM LTD
Publication Date
2011-10-26

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Abstract

The invention relates to a method for producing low water peak single mode fibers with high efficiency. The method for lowering optical fiber hydrogen loss comprises the following steps: after a perform rod is drawn to form optical fibers, carrying out primary resin coating, and entering an UV lamp box to carry out primary illumination curing after the coating; and then carrying out secondary resin coating, and entering the UV lamp box to carry out secondary illumination curing after the coating, wherein optical fiber curing is carried out in mixed gas containing deuterium in a quartz tube vessel, the concentration of the deuterium in the mixed gas is 1-2 percent, the balance of the mixed gas is nitrogen gas or other inert gases, the gas flow is 30-50 l / min, the UV lamp illumination strength inside the lamp box is 100-500 mW, the temperature is kept at 100-300 DEG C, and the inner temperature of the quartz tube vessel is kept at 170-200 DEG C. The invention takes a quartz tube as a vessel for deuterization reaction to carry out on-line reaction of the optical fibers and the mixed gas containing the deuterium, and utilizes the temperature in the tube and the illumination of the UV lamp to enhance the diffusion rate of deuterium gas to enable the deuterium to be in defect reaction with the optical fibers with short reaction contact time, thereby enhancing the treating effect of the deuterium gas, and greatly enhancing the production effect.
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Description

technical field

[0001] The invention relates to an optical fiber, and more particularly relates to a method for efficiently producing a low water peak single-mode optical fiber. Background technique

[0002] The window of optical fiber communication is in the range of 1260nm to 1675nm, but there is a high water absorption peak around 1383nm in conventional optical fiber, which makes the spectral region of 1350-1550nm unusable due to too high attenuation.

[0003] The hydroxide radicals in the quartz glass have a great influence on the optical fiber absorption loss. Such as quartz glass containing water 1 × 10 -6 It causes strong absorption at the wavelength of 2.72μm, resulting in an attenuation of 10000dB / km. The reason is caused by the basic elongation vibration mode of hydroxide. Hydroxide ions have great deformability and are prone to vibration absorption, and the degree and scope of their influence are large. If there is -Si-OH in quartz glass, the absorption peak g...

Claims

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