A Ⅲ-Ⅴ-on-Si ultra-dense comb laser  

作　　者：Zhechao Wang Kasper Van Gasse Valentina Moskalenko Sylwester Latkowski Erwin Bente Bart Kuyken Gunther Roelkens 

机构地区：[1]Department of Information Technology(INTEC),Photonics Research Group,Ghent University-IMEC,Gent 9052,Belgium [2]Center for Nano-and Biophotonics,Ghent University,Gent 9052,Belgium [3]Electrical Engineering Department,Eindhoven University of Technology,Eindhoven 5600,Netherlands

出　　处：《Light(Science & Applications)》2016年第1期45-51,共7页光（科学与应用)（英文版）

基　　金：supported by the European Space Agency through the EPFC project(Electro Photonic Frequency Converter).

摘　　要：Optical frequency combs emerge as a promising technology that enables highly sensitive,near-real-time spectroscopy with a high resolution.The currently available comb generators are mostly based on bulky and high-cost femtosecond lasers for dense comb generation(line spacing in the range of 100 MHz to 1 GHz).However,their integrated and low-cost counterparts,which are integrated semiconductor mode-locked lasers,are limited by their large comb spacing,small number of lines and broad optical linewidth.In this study,we report a demonstration of a Ⅲ-Ⅴ-on-Si comb laser that can function as a compact,low-cost frequency comb generator after frequency stabilization.The use of low-loss passive silicon waveguides enables the integration of a long laser cavity,which enables the laser to be locked in the passive mode at a record-low 1 GHz repetition rate.The 12-nm 10-dB output optical spectrum and the notably small optical mode spacing results in a dense optical comb that consists of over 1400 equally spaced optical lines.The sub-kHz 10-dB radio frequency linewidth and the narrow longitudinal mode linewidth(o400 kHz)indicate notably stable mode-locking.Such integrated dense comb lasers are very promising,for example,for highresolution and real-time spectroscopy applications.

关 键 词：mode-locked lasers near-infrared spectroscopy optical frequency comb semiconductor lasers silicon photonics 

分 类 号：TN2[电子电信—物理电子学]