The relationship between IR characteristic peak and microstructure of the glass used as optical fiber^①

来源期刊：中南大学学报(英文版)2006年第3期

论文作者：段吉安 蔡国华 帅词俊

文章页码：238 - 241

Key words：fiberglass; IR spectroscopic; microstructure

Abstract: Based on the harmonic vibration equation, the relationship between IR characteristic peak of fiberglass and Si-O-Si bond angle was deduced, and 1 100 cm^-1characteristic peak was specifically studied. It is found that 1 100 cm^-1characteristic peak shifts to higher wave number when Si-O-Si bond angle increases. Taking fused biconical taper (FBT) coupler as an example, the microstructures of the fiber coupler manufactured at different drawing speeds were tested with micro infrared spectrum. According to the test results, it is found that the bond angle at the taper region is the largest, the one at the fused region is the second largest, and the one of bare fiber is the smallest. The characteristic peaks of fused-taper region shift to higher wave number when drawing speed increases.