针对宽温宽带大动态高精度光延时调控的需求, 结合数控级联和空间光连续可调延时技术, 设计了一种大动态高精度延时稳定可调的9bit光纤延时线, 并采用磁光开关和稳相光纤搭建了工程样机。试验结果表明, 样机在60℃宽温范围内实现了工作频率1~18GHz, 以5ns为步进, 延时范围达2555ns, 延时精度优于±5.8ps的任意可调; 同时, 针对某一延时点实现了动态范围为600ps、精度优于1ps的延时连续可调。

This paper presents an introduction to the researches in microwave photonics based packages and its application, a 973 project (No. 2012CB315600), which focuses on addressing new requirements for millimeter wave (MMW) system to work with higher frequency, wider bandwidth, larger dynamic range and longer distance of signal distribution. Its key scientific problems, main research contents and objectives are briefed, and some latest achievements by the project team, including generation of linear frequency modulation wave (LFMW), tunable optoelectronic oscillator (OEO) with lower phase noise, reconfigurable filter with higher Q value, time delay line with wider frequency range, down conversion with gain, and local oscillator (LO) transmission with stable phase, are introduced briefly.

采用过滤阴极真空弧法，制备了满足激光稳相加速机制要求的超薄自支撑类金刚石碳靶。室温下沉积，基片偏压为-32 V，薄膜沉积速率约为每脉冲0.002 nm。选取NaCl膜作脱膜剂，采用漂浮法进行脱膜。打捞板孔径为1 mm时，自支撑厚度范围为5~50 nm，自支撑成功率约为70%。利用拉曼光谱仪及原子力显微镜等仪器，测量了薄膜的结构、表面粗糙度等关键参数。