利用悬臂梁将均匀周期光纤光栅变为啁啾光纤光栅

利用均质、等厚及等腰梯形的悬臂梁，对刚性粘贴其表面的光纤光栅的布喇格反射中心波长在1557．68～1564．2nm范围内进行了线性调谐，同时带宽为外0.52nm的均匀周期的光纤光栅被调谐成带宽为2．52nm的啁啾光栅，且啁啾量可调。随着带宽的增加，反射谱的峰值功率呈减弱的趋势。

Transforming a Uniform Fiber Grating into a Chirped One Using a Cantilever Beam

Employing a uniform density and thickness isosceles trapezoid-shaped cantilever beam, the central wavelength of the reflected wave of a fiber Bragg grating, which is pasted on the surface of the beam along the beam axis, is linearly tuned within the range of 1557. 68 to 1564.2 nm experimentally. At the same time, the original uniform period fiber grating with a width of 0. 52 nm (FWHM) is transformed into a chirped one which is with the maximum bandwidth of 2. 52 nm and the chirp is tunable. The peak power of the reflection spectrum of the tuned grating decreases with broadening of the bandwidth.