Keck D B, Tynes R
Appl Opt. 1972 Jul 1;11(7):1502-6. doi: 10.1364/AO.11.001502.
The attainment of 20-dB/km attenuation in experimental single-mode glass optical waveguides has spurred interest in their use for optical communications. The primary wavelength region of interest is in the red or near-infrared region of the spectrum. In this work independent attenuation measurements from 600 nm to 1060 nm have been made on low-loss waveguides and bulk cladding glass, using both laser and scanning-prism monochromator sources. Three bands were observed in the waveguides, at 725 nm, 875 nm, and 950 nm, and identified as due to OH in the glass. Absorptions too small to be precisely measured in the bulk glass measured in them. are seen to be exceedingly important in the waveguides and easily measured in them.
实验性单模玻璃光波导中实现了20分贝/千米的衰减，这激发了人们对其用于光通信的兴趣。主要感兴趣的波长区域在光谱的红色或近红外区域。在这项工作中，使用激光和扫描棱镜单色仪光源，对低损耗波导和块状包层玻璃进行了从600纳米到1060纳米的独立衰减测量。在波导中观察到三个波段，分别在725纳米、875纳米和950纳米处，被确定为是由玻璃中的羟基引起的。在块状玻璃中无法精确测量的吸收，在波导中却显得极为重要且易于测量。
