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Characterization of fiber distributed-feedback lasers with an index-perturbation method

机译：折射率扰动法表征光纤分布式反馈激光器

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摘要

We demonstrate the characterization of fiber distributed-feedback lasers by scanning a heat-induced index perturbation along the cavity and by measuring the induced laser frequency shift. The measured shift is shown to be a good indicator for the intensity distribution in the cavity, and the experimental results reveal that the sensitivity of fiber distributed-feedback laser sensors with frequency readout is highly localized near the grating phase-shift position. Use of the characterization data to determine the grating coupling parameter k, the polarization dependence of k, and birefringence nonuniformities as well as for identitfication of the order of longitudinal mode operation are discussed and demonstrated experimentally. Asymmetrically phase-shifted lasers with highly directional output are also investigated.
机译：我们通过扫描沿腔的热感应折射率扰动并测量感应的激光频移来证明光纤分布反馈激光器的特性。实验表明，测得的位移是腔内强度分布的良好指标，实验结果表明，具有频率读数的光纤分布式反馈激光传感器的灵敏度高度位于光栅相移位置附近。讨论并通过实验证明了使用表征数据确定光栅耦合参数k，k的偏振依赖性和双折射不均匀性以及确定纵向模式操作的顺序。还研究了具有高定向输出的非对称相移激光器。

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