High Power Single-Lobe Operation of Quantum-Dot Lasers Arrays

• Main Authors: Lin, Zhi-Yang, 林志洋
• Other Authors: Lee, Chien-Ping
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/44589052266876008210

碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 103 === 　　In this thesis, InAs quantum dot laser arrays are studied. The goal was to achieve high power laser output with a narrow and single lobed far field distribution in the horizontal (in plan) direction. We used coupled waveguide designs with various stripe distributions to control the output mode of the laser. The result was compared with that of a broad area cavity. 　　Using combinations of a chirped distribution of ridge-waveguides and chirped absorption region in the waveguides, we are able to obtain single lobe far field with excellent angular distributions. 　　The lasers all emitted at 1.3μm. We have achieved single lobe operation in several array designs. With a 1mm cavity length, we obtained a far field pattern with a full width at half maximum (FWHM) of 6.9°at 0.94W output power (no absorption region). With absorption regions in each stripe, we were able to obtain a FWHM of 4.8°at 0.764W for a cavity length of 1mm and a FWHM of 5.1°at 1.85W output power for a cavity length of 1.5mm