Title :
RF-modulation measurement of linewidth enhancement factor and nonlinear gain of vertical-cavity surface-emitting lasers
Author_Institution :
Center for High Technol. Mater., New Mexico Univ., Albuquerque, NM, USA
Abstract :
Using RF-modulation technique of pump current, the linewidth enhancement factor /spl alpha/ and the nonlinear gain of a vertical-cavity surface-emitting laser (VCSEL) were obtained from the measured normalized phase-modulation index versus modulation frequency, is found as 2.7/spl plusmn/0.5 and the measured nonlinear gain of the VCSEL device is found to behave differently from that of edge-emitting lasers with an increase in pump level.
Keywords :
electro-optical modulation; laser cavity resonators; laser variables measurement; optical pumping; phase modulation; refractive index; semiconductor lasers; spectral line breadth; surface emitting lasers; RF-modulation measurement; VCSEL; edge-emitting lasers; linewidth enhancement factor; measured nonlinear gain; measured normalized phase-modulation index; modulation frequency; nonlinear gain; pump current; pump level; vertical-cavity surface-emitting lasers; Current measurement; Frequency measurement; Frequency modulation; Gain measurement; Laser excitation; Phase measurement; Phase modulation; Pump lasers; Surface emitting lasers; Vertical cavity surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
