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我们在0.5-2.5微米的长波长范围内对低 OH 根含量光纤的传输损耗特性作了研究,这种 OH根含量极低的光纤是用改进的化学气相沉积法(MCVD)制作的。在0.9 5-1.68微米光谱范围(除1.39微米左右外),观察到了最低损耗小于0.5分贝/公里的超低损耗“窗口”,处于该“窗口”时的损耗不到1分贝/公里。根据这一研究来阐述二氧化硅系光纤波导的损耗机理,并且可以提议采用掺杂二氧化硅单模光纤或渐变型光纤的低损耗“窗口”的光传输系统作为一种有前途的传输系统,这种系统的中继器间距很长,可达几十公里。
We studied the transmission loss characteristics of low OH-content optical fibers over a long wavelength range of 0.5-2.5 μm. This very low OH-content optical fiber was fabricated using a modified CVD method (MCVD). In the spectral range of 0.9 5-1.68 μm (except for about 1.39 μm), an ultra-low loss “window” with a minimum loss of less than 0.5 dB / km was observed, where the loss was less than 1 dB / km at this “window”. Based on this study, the loss mechanism of a silica-based fiber waveguide is explained and a low-loss “window” optical transmission system doped with a silica single-mode fiber or a tapered fiber can be proposed as a promising transmission system The repeater spacing of such a system is very long, up to tens of kilometers.