摘要
提出了一种基于直流光注入直接调制分布反馈式半导体激光器(DFB-LD)的载波可调的光毫米波生成方案,利用直接调制DFB-LD的输出瞬态波长随驱动电流增大而蓝移的特点,将直流光注入至直调DFB-LD的0码波长附近注入锁定。锁定的直调激光器在1码时输出的蓝移波长与原注入波长相位相干,再通过光电探测器将拍频信号转换为调制的光毫米波信号。实验重点讨论了40GHz光毫米波的产生,同时完成了30、40、50和60GHz光毫米波的可调谐性实验。本文的方案结构简单,无需外调制器和微波本振,载波可调并可产生高至60GHz光毫米波信号,可作为光/无线混合接入中成本节省的光上变频方案。
An all-optical modulated millimeter-wave （mm-wave） signal generation scheme with the tunable carrier frequency based on continuous wave （CW） injection locking of direct modulation distributed feedback laser diode （DFB-LD） is proposed. When the ON-OFF keyed （OOK） data stream directly modulates the DFB-LD,the output transient wavelengths of ＂0＂ and ＂1＂ bit in laser are different owing to the frequency chirp. As a result,if the CW light injection locks the DFB-LD for the duration of ＂0＂ bit,the blue shifted DFB laser and the injected CW light still maintain coherence at the time of ＂1＂ bit, and the two tones then beat together at a high speed photo-detector for ram-wave signal generation. We experimentally implement all-optical up-conversion from 2.5 Gbit/s directly modulated optical data to 30 GHz,40 GHz,50 GHz and 60 GHz mm-wave optical signals. The scheme has a simple structure,with no external modulator or radio frequency （RF） local oscillator, and it is low cost for optical mm-wave signal generation in optical/wireless hybrid system.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2012年第7期1291-1295,共5页
Journal of Optoelectronics·Laser
基金
国家"973"计划(2010CB327603
2012CB315704)资助项目
关键词
光通信
光毫米波生成
注入锁定
啁啾
直调
optical communication optical millimeter-wave generation injection locking
chirp directmodulation
