Title :
Delayed self-heterodyne linewidth measurement of VCSELs
Author :
Schmid, W. ; Jung, C. ; Weigi, B. ; Reiner, G. ; Michalzik, R. ; Ebeling, K.J.
Author_Institution :
Dept. of Optoelectron., Ulm Univ., Germany
Abstract :
We report on high-resolution linewidth measurements of proton-implanted InGaAs-GaAs VCSELs employing the delayed self-heterodyne method. Devices with 16-μm active diameter exhibit record low linewidths of 20 MHz and 4-MHz residual linewidth. The linewidth enhancement factor is accurately determined from the ratio of induced phase to amplitude modulation indexes.
Keywords :
III-V semiconductors; gallium arsenide; indium compounds; laser variables measurement; semiconductor lasers; spectral line breadth; surface emitting lasers; InGaAs-GaAs; amplitude modulation index; delayed self-heterodyne method; high-resolution linewidth measurement; linewidth enhancement factor; phase modulation index; proton-implanted InGaAs-GaAs VCSEL; Amplitude modulation; Delay lines; Frequency modulation; Intensity modulation; Laser modes; Optical modulation; Phase modulation; Photodiodes; Power generation; Vertical cavity surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
