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分析了X射线自由电子激光装置对飞秒同步定时系统的技术需求。系统中采用光纤来传输定时/相位信息。而光纤的光长度会随温度的慢漂而改变,因此通过对比实验研究了温度慢漂对光纤长度变化的影响。研制了基于现场可编程门阵列(FPGA)的数字化相位和幅度检测器对光纤长度变化进行数据监测。百米光纤在典型昼夜温差下导致的时间延迟约6ps。结果显示此数字化相位和幅度检测器可以用于飞秒同步定时系统的长度变化监测和稳定控制系统当中。
The technical requirements of the X-ray free electron laser device for the femtosecond synchronous timing system are analyzed. The system uses optical fiber to transmit timing / phase information. However, the optical length of the optical fiber changes with the slow drift of temperature. Therefore, the influence of the slow drift of temperature on the optical fiber length variation is studied through comparative experiments. A digital phase and amplitude detector based on Field Programmable Gate Array (FPGA) was developed to monitor the fiber length variation. The 100-meter fiber causes a typical time delay of about 6 ps at a typical temperature difference between day and night. The results show that this digital phase and amplitude detector can be used in the femtosecond timing system, length change monitoring and stability control system.