Abstract
To obtain excellent performance optical fiber couplers, the structural difference of SiO2 in couplers with different manufacturing techniques was investigated. With 740-FT-IR infrared spectrometric analyzer, the infrared absorption spectrum of SiO2 in couplers at different drawing velocities was measured, and two characteristic peaks in the wavenumber range of 650–2000 cm−1 were 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 wave-number of the characteristic peaks are related to the manufacturing technique of couplers. The characteristic peak at about 943 cm−1 becomes steeper when increasing the drawing velocity. At the drawing velocity of 150 µm/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.
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Foundation item: Project (50235040) supported by the National Natural Science Foundation of China
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Duan, Ja., Shuai, Cj., Miao, Jy. et al. Structure analysis of optical fiber coupler with infrared spectrometry. J Cent. South Univ. Technol. 11, 328–331 (2004). https://doi.org/10.1007/s11771-004-0067-5
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DOI: https://doi.org/10.1007/s11771-004-0067-5