Title :
Side-mode suppression for long DBR lasers
Author :
Tager, Alexei A.
Author_Institution :
Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
We present the results of a traveling-wave analysis of the excitation of side longitudinal modes for a nearly-single mode DBR laser with long passive waveguide. The theory accounts for the intraband and interband mode mixing and predicts their joint multiplicative broadband effect on the side mode intensities. The sign of the effect depends on the location of the lasing mode on the net gain curve, yielding strong symmetrical side-mode suppression for negative frequency detuning. The spectrum thus features a symmetrical shape with asymmetrical tuning characteristics. The effect enables almost single-mode operation of cm-long DBR lasers.<>
Keywords :
distributed Bragg reflector lasers; laser modes; laser tuning; semiconductor lasers; waveguide lasers; DBR lasers; asymmetrical tuning characteristics; cm-long DBR lasers; interband mode mixing; intraband mode mixing; joint multiplicative broadband effect; lasing mode; negative frequency detuning; net gain curve; passive waveguide; side longitudinal modes; side mode intensities; side-mode suppression; single-mode operation; symmetrical shape; symmetrical side-mode suppression; traveling-wave analysis; Distributed Bragg reflectors; Frequency; Laser excitation; Laser mode locking; Laser modes; Laser noise; Laser theory; Laser tuning; Optical coupling; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
