【摘要】 介绍了一种Si基热光Fabry Perot (F P)腔可调谐滤波器 .F P腔由电子束蒸发的非晶硅构成 .利用非晶硅的热光效应 ,通过对Si腔加热 ,改变F P腔的折射率 ,从而引起透射峰位的红移 .该原型器件调谐范围为 1 2nm ,透射峰的FWHM (峰值半高宽 )为 9nm ,加热效率约为 0 1K/mW .精确控制DBR(分布式Bragg反射镜 )生长获得高反射率镜面是减小带宽的有效途径 ;通过改进加热器所处位置及增强散热能力 ,有望进一步提高加热效率更多还原

【Abstract】 A 1.55μm Fabry-Perot (F-P) thermo-optical t unable filter is fabricated.The cavity is made of amorphous silicon (a-Si) layer grown by electron-beam evaporation technique.Due to the excellent thermo-optical property of a-Si,the refractive index of the F-P cavity will be changed by heating;the transmittance resonant peak will therefore shift substantially.The measured tuning rang is 12nm, FWHM (full-width-at-half-maximum) of the transmissi on peak is 9nm,and heating efficiency is 0.1K/mW.The large FWHM is mainly due to th e non-ideal coating deposition and mirror undulation.Possible improvements to increase the efficiency of heating are suggested.更多还原