On the one hand , the receiver must be self - adaptive to set as fast as possible the " 0 " and " 1 " bit level judgement threshold in a dynamic way ; on the other hand , the transmitter of onu should take some measures to minimize and compensate for the burst delay . the optical burst transmission circuit is thus required to switch on and off the laser in a snappy way to ensure fast signal sending . in that sense , the laser must be designed with a superb response speed 一方面，接收机必须具有自适应功能，能以最快的速度动态调定" 0 " 、 " 1 "比特电平判决门限；另一方面， onu的发射机应该采取-定的措施减小和补偿突发时延，其光突发发送电路要求能够非常快速地开启和关断激光器，迅速发送信号，所以，它需要使用响应速度很快的激光器。
