报道了基于圆柱型光子晶体自准直效应的低功耗Fabry-Perot干涉仪。该干涉仪是在二维光子晶体中引入两排线缺陷构成的。引入的线缺陷具有高反射率和低透射率。在自准直频率范围0.187c/a~0.201c/a,线缺陷的透射率介于20.77%~40.65%。利用时域有限差分方法对FPI的透射谱进行研究,结果表明对两排缺陷的间距d即使进行微小的扩大也会引起透射峰向低频移动,透射谱的自由光谱范围和透射峰的频率随着d的增大而变小,透射谱的半高宽会随着线缺陷的反射率的提高而逐渐变小。 A low power Fabry-Perot interferometer based on self-collimation of cylindrical photonic crystals is reported. The interferometer is a two-dimensional photonic crystal in the introduction of two rows of defects formed. The introduced line defects have high reflectance and low transmittance. In the self-collimation frequency range of 0.187c / a ~ 0.201c / a, the line defect transmissivity ranged from 20.77% to 40.65%. The time-domain finite difference method is used to study the transmission spectrum of FPI. The results show that the pitch d of the two rows of defects can cause the transmission peak to move to the low frequency even if the distance d between the two rows of defects is small. The frequency of the free spectral range and the transmission peak of the transmission spectrum varies with d increases and decreases, the half-width of the transmission spectrum will gradually decrease with the increase of the reflectivity of the line defects.