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首页> 外文会议>Passive Components and Fiber-based Devices III pt.1 >Fiber-Bragg-grating cavity sensor based on a self-seeded Fabry-Perot laser diode
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Fiber-Bragg-grating cavity sensor based on a self-seeded Fabry-Perot laser diode

机译：基于自种法布里-珀罗激光二极管的光纤布拉格光栅腔传感器

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摘要

We propose a low-cost, general-purpose fiber Bragg grating (FBG) cavity sensing technique, where optical picosecond pulses generated from a self-seeded Fabry-Perot laser diode are used to interrogate a fiber cavity formed with two chirped FBGs and the optical loss in the cavity is determined from the peak power ratio of the first two pulses reflected from the cavity. This technique does not require intensity referencing and the sensor output is insensitive to drifts in the center wavelengths of the FBGs. We demonstrate this technique experimentally with a long-period fiber grating (LPFG) placed in the fiber cavity as a refractive-index sensor. The results from the cavity-loss measurement are consistent with the wavelength-shift measurement of the LPFG in response to a change in the surrounding index. This technique is applicable to general intensity-based sensors and has the potential to be further developed for remote sensing of a wide range of physical or chemical parameters. It also provides a new way of converting the wavelength shift of an LPFG sensor into an intensity-based signal for easy processing.
机译：我们提出了一种低成本的通用光纤布拉格光栅（FBG）腔传感技术，该技术将自种的Fabry-Perot激光二极管产生的皮秒脉冲用于询问由两个chi FBG和光纤形成的光纤腔。腔中的损耗由腔中反射的前两个脉冲的峰值功率比确定。此技术不需要强度参考，并且传感器输出对FBG中心波长的漂移不敏感。我们通过放置在光纤腔中作为折射率传感器的长周期光纤光栅（LPFG），以实验方式演示了该技术。响应于周围折射率的变化，腔损耗测量的结果与LPFG的波长偏移测量结果一致。此技术适用于基于常规强度的传感器，并且有可能进一步开发用于遥感各种物理或化学参数。它还提供了一种将LPFG传感器的波长偏移转换为基于强度的信号以便于处理的新方法。

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