NDLI: Suppressing longitudinal spatial hole burning with dual assisted phase shifts in pitch-modulated DFB lasers

Content Provider	Springer Nature Link
Author	Guo, Renjia Zheng, Junshou Zhang, Yunshan Shi, Yuechun Li, Lianyan Qiu, Bocang Lu, Linlin Chen, Xiangfei
Copyright Year	2015
Abstract	An equivalent corrugation pitch-modulated (ECPM) distributed feedback (DFB) semiconductor laser with two equivalently assisted phase shifts (EAPS) was theoretically studied and experimentally demonstrated. The simulated results showed that the longitudinal photon density distribution of the ECPM + EAPS DFB lasers was much more uniform than that of a sole ECPM DFB laser without EAPS, and the longitudinal spatial hole burning was therefore suppressed more effectively. The results of experiment showed that good single longitudinal mode operation was achieved, with side mode suppression ratio (SMSR) being over 35 dB, and the wavelength range was from 1,559.64 to 1,563.02 nm when the operation current was from 50 to 160 mA at the temperature of 25 °C, and the SMSR increased to 46.29 dB when the injection current was 130 mA.由于分布反馈式(DFB)半导体激光器具有结构简单、频谱稳定等优点,在光通信领域具有十分广泛的应用。传统的DFB激光器在大电流条件下容易产生空间烧孔效应,从而造成单模特性不稳定。为了抑制空间烧孔效应,本文基于重构等效啁啾技术设计了具有双辅助相移的周期调制光栅结构,并从理论和实验两个方面进行了研究,理论仿真和实验结果吻合。另外仿真计算了激光器谐振腔中光场分布的平坦因子,利用双辅助相移周期调制光栅结构的DFB激光器,其腔内光场分布平坦程度得到明显提高。实验结果表明:温度25 °C,注入电流50-160 mA时,激光器边模抑制比均超过35 dB,单模特性保持稳定。因此,本文论述的DFB激光器对空间烧孔效应具有明显抑制作用。
Starting Page	1026
Ending Page	1032
Page Count	7
File Format	PDF
ISSN	20959273
Journal	Chinese Science Bulletin
Volume Number	60
Issue Number	11
e-ISSN	20959281
Language	Chinese
Publisher	Science China Press
Publisher Date	2015-05-15
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Distributed feedback corrugation-pitch-modulated Reconstruction equivalent chirp Spatial hole burning Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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