In the solution of FTTR,the received radio signals was multiplied by a pseudorandom noise (PN) at Terminal Stations(TSs) ,and encapsul ated into the envelope of optical signal by IM of LD. 在光纤到铁路沿线(FTTR)方案中对终端站接收的无线信号进行扩频编码，进入光纤通道并到达中心站。
With this technique,the encapsulated Bifidoacterium maintains high living activity and can still multiply in the encapsule. 微囊中的菌体仍然保持较高的活性，且能在微囊中继续增殖。该耐酸微囊化技术有希望应用于新型微生态制剂。
