光传送网中复用映射电路的设计

为了简化光传送网中光数据单元的时钟电路设计、降低成本,提出了一种基于均匀缺口时钟的同步电路。首先,采用异步FIFO实现缺口同步时钟的生成;然后,通过带有缺口的同步时钟设计了一种复用映射电路,处理不同类型的光数据单元,实现信号频偏吸收、时钟数据恢复和前向错误纠错。并通过电路仿真证明,该方案设计的电路可达到与传统方案相同的性能,且设计和实现采用虚拟时钟替代锁相环,使电路更加简单经济。

Design of Data Unit Multiplexing and Mapping in Optical Transport Network

In order to simplify the clock circuit design of optical data unit in optical transport network and reduce costs,a synchronization circuit based on uniform gap clock is proposed.First,the generation of gap synchronous clock is achieved by using the asynchronous FIFO;then a multiplexing and mapping circuit using the synchronous clock with a notch is designed to handle different types of optical data unit,to achieve the absorption of the signal frequency offset,clock data recovery,and forward error correction.The proof by circuit simulation shows the program can achieve the same performance as traditional programs,but the design and implementation of the circuit are simple and economical by using a virtual clock instead of phase-locked loop.