摘要
通过理论分析、实验和计算机模拟得到：进行直接强度调制时，体块型DFB激光器的总微分量子效率（与多量子阱DFB激光器相比）过低，从而导致其绝热啁啾占激光器啁啾的主要部分；用于无再生中继距离较大的强度调制／直接检测（IM／DD）光纤通信系统时，色散效应将导致信号脉冲上升沿压缩，使系统误码率增加。据此建议：在无再生中继距离大于100～120km的常规单模光纤IM／DD系统中，应采用多量子阱激光器。
It is revealed from the theoretical analysis, experimental study and computer simulation of IM/DD optical transmission systems that, compared with MQW DFB laser, the lower total differential quantum efficiency of bulk DFB laser makes adiabatic chirp dominate its total chirp.This causes pulse-leading-edge compression along transmission over conventional single-mode fiber, which may lead serious system bit-error rate to increase. Accordingly, it is recommended to use MoW lasers for IM/DD optical fiber transmission systems with a nonregeneration span longer than 100～120km.
出处
《高技术通讯》
EI
CAS
CSCD
1997年第8期22-25,共4页
Chinese High Technology Letters
基金
863计划资助
关键词
绝热啁啾
光纤通信
DFB激光器
Pulse compression, Adiabatic chirp, Total differential quantum efficiency
