1.5 μm的工作波长为光纤系统所吸引,因为在该波长大多数玻璃光纤呈现出最小衰减。然而,在 1.5μm波长工作,通常会受到低的数据速率或者系统要具有光谱极纯的光源的限制,这是由于光纤色散(在 1.3μm为最小)在 1.5μm值得注意的缘故。目前两个独立的研究组分别制作了在 1.5μm呈现低损耗、最小色散的折射率V型分布的光纤,这为高速的长距离传输开辟了道路。 The working wavelength of 1.5 μm is attractive for fiber systems because most glass fibers exhibit a minimum attenuation at this wavelength. However, working at 1.5 μm wavelength is usually limited by the low data rate or the system’s need to have a very purely spectral source, due to the notable dispersion of the fiber (at 1.3 μm minimum) at 1.5 μm. At present, two independent research groups each produce optical fibers with refractive index V-shaped distribution exhibiting low loss and minimum dispersion at 1.5 μm, which opens the way for high-speed long-distance transmission.