光纤网时间同步性能计量校准装置研制

为解决光纤时间传递系统中存在的远距离传递准确度低的问题，分析了环回法、双纤双向时间同步、双向波分复用、双向时分复用四种主流的高精度光纤时间传递方法的基本原理和技术特点，在此基础上研制了单信道时频传递装置。该装置采用电学相位补偿法实现频率传递同步，采用环回法与时分复用相结合的方法实现时间传递同步；使用1 秒脉冲（Pulse Per Second， PPS）和100 MHz共同标记时刻信号，其中1 PPS作为时刻粗标记，100 MHz作为时刻细标记，实现高精度时间同步。经实验证明，单信道时频传递装置的不确定度约为13 ps，能够满足现有光纤时频同步网计量校准的要求。该装置在多级时间传递同步、光纤时频同步网计量校准等领域中具有广阔的应用前景，为建设高稳定性、高可靠性和高精度的授时体系提供了重要技术支撑。

Development of time synchronization performance measurement and calibration device for optical fiber network

In order to solve the problem of low accuracy of long?distance transmission in fiber optic time transfer system, the basic principles and technical characteristics of four mainstream high?precision fiber optic time transfer methods, namely round?trip, dual?fiber bidirectional time synchronization, bidirectional wavelength division multiplexing and bidirectional time division multiplexing, were analyzed. Based on this, a single?channel time?frequency transmission device was developed. The device adopts the electrical phase compensation method to realize frequency transfer synchronization, and uses the round?trip method combined with bidirectional time division multiplexing to achieve time transfer synchronization. It uses 1 PPS and 100 MHz to jointly mark the time signal, with 1 PPS as the coarse time marker and 100 MHz as the fine time marker, to achieve high precision time synchronization. Experiments show that the uncertainty of the single?channel time?frequency transmission device is about 13 ps, which can meet the requirements of the existing fiber optic time?frequency synchronization network metrology calibration. The device has broad application prospects in the fields such as cascaded time transfer synchronization and fiber optic time?frequency synchronization network metrology calibration. It provides an important technical support for the construction of high stability, high reliability and high precision time service system.