一种CPT铯原子钟控制系统的设计  

Design of control system for a CPT Cesium atomic clock

作　　者：王淼儿 姚燕 Wang Miaoer;Yao Yan(Collage of Metrology and Testing Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018

出　　处：《电子技术应用》2020年第12期57-60,66,共5页Application of Electronic Technique

摘　　要：实现微型化、低功耗的相干布居囚禁(CPT)原子钟对于其在通信、定位等精密测量领域的应用具有重要意义。而外围控制电路控制频率和激光精准输出是实现相干布居囚禁原子钟的关键技术。设计了一种CPT铯原子钟外围控制电路系统。系统利用微调和粗调两级电流调节共同驱动VCSEL激光器工作,相对于单一电流调节,输出更加精准;采用锁相环电路产生可调制的微波信号;为实现微波功率可以调节,采用PIN二极管调节微波功率衰减;同时采用软件调制解调方法代替传统硬件调制解调电路,节约电路逻辑资源。实验测试结果表明,微波调制激光器产生相干调频多色光,微波频率为4.596 267 GHz时,微波输出功率达到-3.33 dBm。微波射频电路在1 kHz频率偏移量下,相位噪声低于-80 dBc/Hz,具有较好的性能。The realization of coherent population trapping(CPT)atomic clock with miniaturized,low-power is of great significance for its applications in the fields of precision measurement such as communication and position.The peripheral circuit controlling accurate frequency and laser output is the key technology to achieve coherent population trapping atomic clock.A peripheral control system of CPT Cesium atomic clock is developed in this paper.The system uses two levels for fine—tuning and coarse-tuning to drive the VCSEL laser to work,which is more accurate than single current adjustment and uses phase-locked loop circuit to generate modulated microwave signal.PIN diodes are used to adjust the microwave power attenuation in order to realize the adjustment of microwave power.In the meanwhile,software modulation and demodulation methods is applied to replace traditional hardware modulation and demodulation circuits,which saves circuit logic resources.The testing results show that the output of the microwave power reaches-3.33 dBm when the microwave frequency is 4.596267 GHz.The phase noise of the radio frequency circuit is better than-80 dBc/Hz under the frequency offset of 1 kHz which has better capability.

关 键 词：相干布居囚禁 原子钟 控制系统 调制解调 相位噪声 

分 类 号：TB939[一般工业技术—计量学]