采用二氧化锗-五氧化二磷-二氧化硅作原料的渐变型多模光纤和发光二极管作光源的未来系统中,为减小色散,希望工作在1.2μm和1.6μm之间,以获得低损耗和宽频带。在1.39μm,由于OH振动的一次谐波而造成的吸收是该频带光纤总损耗的主要因素。为了充分利用这一部分频谱,要求光纤OH含量非常低。在采用 MCVD法制造光纤的过程中,预制件的 OH含量主要来源于材料中的氢氧根杂质和从基管中扩散出来的OH离子,所以制造低损耗多模光纤需采用高纯度的原材料和阻挡层。最近,已报导了一种依靠OH→OD转换工艺的新方法,利用氘处理基 In future systems using graded multimode fibers of germanium dioxide-phosphorus pentoxide-silica as starting materials and light-emitting diodes as light sources, in order to reduce the chromatic dispersion, it is desirable to work between 1.2 μm and 1.6 μm in order to obtain low Loss and broadband. At 1.39 μm, the absorption due to the first harmonic of OH vibration is a major factor in the total loss of the optical fiber in this band. In order to make full use of this part of the spectrum, the OH content of the optical fiber is required to be very low. In the process of manufacturing optical fiber by MCVD method, the OH content of the preform is mainly derived from the hydroxide impurities in the material and the OH ions diffused out of the base tube. Therefore, low-loss multimode optical fiber needs to be made of high-purity raw materials and Barrier layer. Recently, a new method that relies on the OH → OD conversion process has been reported that uses deuterium-treated groups