Investigation of Brillouin properties in high-loss doped silica waveguides by comparison experiment

作者：Shujing Li; Xing Li; Wenfu Zhang; Jianping Chen; Weiwen Zou*
摘要：We demonstrate a novel scheme to investigate Brillouin properties of waveguides with high loss and serious reflection by comparison experiment with a single-mode fiber (SMF). An optical filter is used to filter the reflected pump light and Brillouin scattering is detected using a lock-in amplifier (LIA). In order to obtain a sufficiently large Brillouin gain in a very short medium, a modulation signal with a time width of 2 ms is used. Using the mathematical relationship between the output power and measurement range of the LIA, the measured Brillouin gains of the waveguides and the SMF are normalized to derive the relationship between their Brillouin gain coefficients. This scheme is verified on two doped silica waveguides. The Brillouin scattering properties of the doped silica waveguides are further characterized and the Brillouin gain coefficients are derived.
出版源：IEEE Photonics Technology Letters
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