中文摘要：

基于自由频谱区（FSR）倍数增长式光梳状滤波器阵列,设计了一种微波瞬时频率测量方案,实现了具有自然二进制编码的数字输出。待测微波信号经过载波抑制型单边带调制后加载到光波上产生一阶边带,而后将其输入到光梳状滤波器阵列中;阵列由多个梳状滤波器并联而成,它们滤波响应对应的FSR呈倍数增长趋势,最高位数字输出对应滤波器的FSR最大。滤波后输出的光信号经光电检测、比较和判决后,获得N位自然二进制码标识的频率值,提高了编码效率和测量精度。最后,在0～40GHz范围,验证了4位有效长度的数字编码式测频结果。

英文摘要：

Based on an optical filter array with multiplied free spectral ranges（FSRs）,an approach is proposed to perform instantaneous frequency measurement,with natural binary coded digital outputs achieved.An optical carrier is modulated by a microwave signal to be measured in terms of carrier-suppression and single sideband modulation,resulting in a single induced optical sideband which goes through an optical filter array.The optical filter array consists of several filters which are connected in parallel.The FSRs of these filters′ responses are multiply increased step by step and the filter corresponding to the most significant bit has the largest FSR.The filtered optical sideband is detected,compared and decided,such that the measured frequency is labeled by an N-bit natural binary digital code,which improves the coding efficiency and measurement accuracy.In simulation,4-bit digital outputs are achieved for frequency measurement within the range of 0-40 GHz.