Structure analysis of optical fiber coupler with infrared spectrometry^①

来源期刊：中南大学学报(英文版)2004年第3期

论文作者：段吉安 帅词俊 苗健宇 钟掘

文章页码：328 - 331

Key words：optical fiber coupler; fused biconical taper; infrared spectrometry; SiO₂; structure

Abstract: To obtain excellent performance optical fiber couplers, the structural difference of SiO2in couplers with different manufacturing techniques was investigated. With 740-FT-IR infrared spectrometric analyzer, the infrared absorption spectrum of SiO₂in couplers at different drawing velocities was measured, and two characteristic peaks in the wavenumber range of 650 2000 cm^-1were observed. One characteristic peak is at about 943 cm^-1, which is attributed to Si—O—Si bond asymmetric stretching vibration, the other is at about 773 cm^-1, which is attributed to Si—O—Si bond symmetric stretching vibration. From the infrared spectrum, it is found that the intensity and wavenumber of the characteristic peaks are related to the manufacturing technique of couplers. The characteristic peak at about 943 cm-1becomes steeper when increasing the drawing velocity. At the drawing velocity of 150μm/s, the distance between the two characteristic peaks is maximum, and then the optical fiber coupler has excellent performance, indicating that the performance of the optical fiber coupler has a close relationship with the wavenumber of the two characteristic peaks.