摘要:
An optical transmission fiber comprises a central core having an index difference Δn1 with an outer optical cladding; a first inner cladding having an index difference Δn2 with the outer cladding; and a second buried inner cladding having an index difference Δn3 with the outer cladding of less than −3.10−3. The second buried inner cladding moreover contains Germaniumn in a weight concentration of between 0.5% and 7%. The fiber shows reduced bending and microbending losses whilst exhibiting the optical performances of a standard single-mode fiber (SSMF).
摘要:
A polarized lightwave reflectometry method including the steps of sending at least two polarized light signals into the optical fiber to be tested, the signals presenting a determined angular offset relative to each other so that the polarization mode dispersion coefficient remains independent of any rotation of polarization in the optical fiber under test; extracting a scalar parameter of the relative noise type for each trace obtained by back-scattering of the light signal; and estimating the polarization mode dispersion coefficient by a function having a single scalar input, which function is of the type based on exponentials and has the form exp (a+bP+cP−1).
摘要翻译:一种偏振光波反射测量方法,包括以下步骤:将至少两个偏振光信号发送到要测试的光纤中,所述信号相对于彼此呈现确定的角度偏移,使得偏振模色散系数保持独立于任何偏振旋转 被测光纤; 提取通过光信号的反向散射获得的每个迹线的相对噪声类型的标量参数; 并且通过具有单个标量输入的函数来估计偏振模色散系数,该函数是基于指数的类型,并且具有形式exp(a + bP + cP -1)。
摘要:
Natural or synthetic silica is deposited on a preform set into rotation in front of a plasma torch which moves back and forth substantially parallel to a longitudinal direction of the preform, a first feed duct feeds the plasma with grains of natural or synthetic silica while a second feed duct feeds the plasma with a fluorine or chlorine compound, preferably a fluorine compound, mixed with a carrier gas. Any sodium or lithium contained in the grains of natural or synthetic silica react with the fluorine or chlorine of the fluorine or chlorine compound, thereby making it possible to improve the optical quality of fibers drawn from a preform built up with natural or synthetic silica, and to do so at reduced cost.
摘要:
A method of using a plasma to build up an optical fiber preform consists in injecting hydroxyl ions in a controlled manner into the build-up silica that is deposited on the preform. The invention is applicable to the manufacture of optical fibers, in particular monomode fibers.