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首页> 外文期刊>Optics Letters >Optically tunable fiber Bragg grating based on a photo-mechanical tuning mechanism
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Optically tunable fiber Bragg grating based on a photo-mechanical tuning mechanism

机译：基于光电调谐机构的光学调谐光纤布拉格光栅

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摘要

We present an optically tunable fiber Bragg grating (FBG) based on a photo-mechanical tuning mechanism. Azobenzene containing polymer was utilized as a photomechanical tuning agent coated over a bare section of FBG. Controlled by ultraviolet (UV) irradiation, the polymer coating acts as a micro-actuator that deforms the fiber structure. Reversible tunability was obtained by the coating locally stretching the embedded FBG fiber by the intensity and the spatial distribution of the UV light. We found that our tunable FBG could linearly tune its center wavelength as large as 2.2 nm in a symmetric UV irradiation. We also found that a chirp of grating periods could be produced by an asymmetric irradiation, where the center of the UV irradiation profile is offset to that of the FBG device. The spectral width measured at 10 dB could be broadened from 0.4 to 1.2 nm by simply adjusting the relative position of the UV light source. The direction of the chirp, in either normal or anomalous dispersion, could be easily switched as well. Our observations demonstrated that our device provides a versatile means of tunable filters or dispersion generators, which is useful in various applications. (C) 2019 Optical Society of America
机译：我们基于光电调谐机构介绍光学调谐光纤布拉格光栅（FBG）。含氮苯苯的聚合物用作涂覆在FBG的裸截面上的光学机械调节剂。由紫外（UV）照射控制，聚合物涂层用作变形纤维结构的微致动器。通过局部延伸嵌入的FBG纤维通过UV光的空间分布局部涂覆嵌入的FBG光纤来获得可逆的可调节性。我们发现，在对称的紫外线照射中，我们的可调式FBG可以线性地调谐其中心波长，其中心波长大至2.2nm。我们还发现光栅周期的啁啾可以通过不对称照射产生，其中UV照射分布的中心偏移到FBG装置的中心。通过简单地调节UV光源的相对位置，在10dB处测量的光谱宽度可以从0.4到1.2nm宽。啁啾的方向，正常或异常的分散，也可以容易地切换。我们的观察结果表明，我们的装置提供了一种可调谐过滤器或色散发生器的多功能手段，可用于各种应用。 （c）2019年光学学会

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