检测法布里-珀罗滤波器传输时延的谐振腔方法（英文）

Resonator Method to Measure Optical-pulse-propagation Delay of Fabry-Perot Filters

提出一种谐振腔方案用于测量法布里-珀罗滤波器的光传输时延.将法布里-珀罗滤波器置于谐振腔中,根据谐振腔长与谐振频率的关系,将滤波器的传输延时量转化为谐振基频的减小量进行测量.实验测得谐振基频的变化量为0.167MHz,对应谐振腔长的变化量为3.570m.除去器件的尾纤等包装长度,滤波器的传输延时为1.542m.该方案不依赖于镜面反射系数、精细度等滤波器参数,可顺利测得光信号经过高精细度法布里-珀罗滤波器的传输时延,甚至可实现很小尺寸的滤波器时延测量.通过谱分析法测量得到延时量为1.581m,验证了实验结果的正确性.

A resonant method is proposed to measure the optical-pulse-propagation delay of the Fabry-Perot filter.The Fabry-Perot filter is placed in a resonant cavity,so its transmission delay is converted to the decrease of the resonant fundamental frequency,according to the relationship between the cavity length and the resonant frequency.The change in the fundamental frequency of the resonance is measured to be 0.167 MHz,which corresponds to a change in the length of the resonant cavity of 3.570 m.Subtracting the package length,the transmission delay is1.542 m.No other parameters are needed in the scheme,such as the reflection coefficient of specular surface,the fineness and so on,it is easy to get noticeable propagation delay of high-finesse Fabry-Perot filters,even a minor-sized one.A transmission delay of1.581 m is obtained by spectral analysis,which is a verification to the above experimental results.