光子晶体面发射蓝光激光器的高速调制性能分析  

Analysis of High-Speed Modulation Performance of Photonic Crystal Surface-Emitting Blue Lasers

作　　者：周扬 贺树敏 沈威 刘启发[1] Zhou Yang;He Shumin;Shen Wei;Liu Qifa(College of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,Jiangsu,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《中国激光》2023年第23期23-29,共7页Chinese Journal of Lasers

基　　金：信息光子学与光通信国家重点实验室(北京邮电大学)开放基金(IPOC2021B03);区域光纤通信网与新型光通信系统国家重点实验室开放基金(2023GZKF018);国家自然科学基金(11974188)。

摘　　要：光子晶体面发射激光器基于光子晶体能带带边模式,形成二维微腔谐振,继而实现光增益和激射,其具有高功率、单纵模等优异特性。基于氮化镓基蓝光激光器结构和速率方程调制理论,对异质结构光子晶体面发射激光器进行了动态调制性能分析。通过仿真计算得出,在所研究的激光器结构参数下,阈值电流为1.76 mA,最大3 dB调制带宽为42 GHz,最低数据发送能耗为62.78 pJ·bit^(-1),展示出了该结构激光器的基础性能和高速调制特性,为具有大调制带宽的蓝光激光器的设计提供了参考。Objective With the development of a new generation of electronic communication technology,data traffic for transmitting information is increasing,thereby driving the development of optical communication technology for higher speed,larger capacity,and lower power consumption.Photonic crystal surface-emitting lasers(PCSELs)are the key devices in this field that have a wide range of potential applications.PCSELs exhibit outstanding features,such as large-area single-mode excitation,arbitrary beam shaping and polarization,and high power.Simultaneously,GaN compounds can be flexible and adjustable to cover any wavelength band from ultraviolet(UV)to green,thereby the laser based on this is complementary to the mature GaAs-and InP-based lasers.Using a photonic crystal heterostructure design can improve the performance of a laser,particularly for achieving large bandwidths.In this study,the expressions for the threshold current,3 dB modulation bandwidth,and output power of PCSELs are derived using the rate equation model,and the fundamental and modulation performances of a GaN-based photonic crystal surface emission laser are analyzed and compared with those of other reported lasers.This investigation lays the foundation for the design of blue-light lasers with large modulation bandwidths.Methods In this study,we first derive expressions for the threshold current,3 dB modulation bandwidth,and output power of PCSELs using the classical rate equation model to lay the foundation for subsequently writing the code in MATLAB.GaN-based PCSELs are selected for modulation analysis,and the core parameters of the laser are derived after strict finite-domain difference(FDTD)-based calculations and verified using the ensemble wave analysis method(RCWA).The MATLAB codes are written using the derived equations and the laser parameter values are substituted into this code to obtain a plot in which the 3 dB modulation bandwidth,output power,and minimum energy consumption are indicated.The relationship between the calculated and simulated

关 键 词：激光器 光子晶体面发射激光器 速率方程 异质结构 3 dB调制带宽 发送能耗 

分 类 号：TN248[电子电信—物理电子学]