Design and analysis of a mode-hop-free tunable laser based on etched diffraction grating  

作　　者：Rui-xing ZENG Lei WANG Jian-jun HE 

机构地区：[1]Center for Integrated Optoelectronics, State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2010年第10期793-797,共5页浙江大学学报C辑（计算机与电子（英文版）

基　　金：supported by the National Natural Science Foundation of China (No 60788403);the Fundamental Research Funds for the Central Universities of China

摘　　要：A novel semiconductor laser which can achieve mode-hop-free tuning is proposed. The device consists of an etched diffraction grating （EDG） as a dispersive element to provide the mode selection function and an active waveguide to provide optical gain for the laser. The slab waveguide region of the EDG contains a tuning section covered by an electrode to inject a tuning current, and thus changes the refractive index. Mode-hop-free tuning is achieved by specially designing the shape of the tuning section, so that the tuning rate of the central wavelength reflected by the EDG and the tuning rate of the resonant wavelength of the laser cavity are equal. An optimized tuning section shape is designed to obtain the largest tuning range within a limited current range. Numerical simulation is presented to demonstTate the mode-hop-free tuning operation.A novel semiconductor laser which can achieve mode-hop-free tuning is proposed.The device consists of an etched diffraction grating(EDG) as a dispersive element to provide the mode selection function and an active waveguide to provide optical gain for the laser.The slab waveguide region of the EDG contains a tuning section covered by an electrode to inject a tuning current,and thus changes the refractive index.Mode-hop-free tuning is achieved by specially designing the shape of the tuning section,so that the tuning rate of the central wavelength reflected by the EDG and the tuning rate of the resonant wavelength of the laser cavity are equal.An optimized tuning section shape is designed to obtain the largest tuning range within a limited current range.Numerical simulation is presented to demonstrate the mode-hop-free tuning operation.

关 键 词：Semiconductor laser Integrated optics Etched diffraction grating 

分 类 号：TN253[电子电信—物理电子学] TN248