THz optical pulses from a coupled-cavity quantum-dot laser |
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| Authors: | J Liu ZG Lu PJ Poole PJ Barrios D Poitras Z Jiao XP Zhang |
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| Institution: | 1. Institute for Microstructural Sciences, National Research Council Canada, 1200 Montreal Road, Ottawa, Canada K1A 0R6;2. Department of Electrical and Computer Engineering, Concordia University, Montreal, Canada H3G 1M8;1. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, PR China;3. School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, People?s Republic of China;2. Department of Physics, Qufu Normal University, Qufu 273165, People?s Republic of China |
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| Abstract: | Optical pulses are generated from a coupled-cavity quantum-dot (QD) laser consisting of a short QD-waveguide Fabry–Perot (F–P) cavity and three long external fiber Bragg grating (FBG) cavities. When the laser is biased at low operation current, the feedback from the external cavities dominates and laser pulses have a 1.01 THz repetition rate, determined by the equal frequency difference of the three FBGs. We are thus able to decouple the repetition rate of a mode-locked laser from the cavity length. With much higher bias current, the QD F–P cavity dominates and the repetition rate is switched to 43.8 GHz, defined by the length of the F–P cavity. |
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