Title :
Experimental and theoretical evaluation of the CW suppression of TE side modes in conventional 1.55 μm InP-InGaAsP distributed feedback lasers
Author :
Ketelsen, Leonard J P ; Hoshino, Isako ; Ackerman, David A.
Author_Institution :
AT&T Bell Lab., Murray Hill, NJ, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
A study is made of the factors that influence the suppression of the second TE Bragg mode in conventional 1.55 μm capped-mesa-buried-heterostructure distributed-feedback (CMBH-DFB) lasers. It is shown that the TE side-mode suppression becomes increasingly worse as the coupling of the optical mode to the grating ( kL) becomes larger, as expected from theoretical predictions. This degradation is not correlated to changes in the measured threshold gain margin, as obtained from spectral resonances. To explain the results, the authors introduce a new parameter-the threshold bias margin-which is a measure of the threshold difference between the lasing mode and the most prominent side mode
Keywords :
III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; laser transitions; semiconductor junction lasers; 1.55 micron; III-V semiconductors; InP-InGaAsP; capped mesa buried heterostructure distributed feedback lasers; continuous wave suppression; coupling; grating; lasing mode; optical mode; second TE Bragg mode; spectral resonances; theoretical evaluation; theoretical predictions; threshold bias margin; threshold gain margin; transverse electric side mode suppression; Distributed feedback devices; Gain measurement; Laser modes; Laser theory; Optical coupling; Optical distortion; Optical feedback; Optical fiber communication; Resonance; Tellurium;
Journal_Title :
Quantum Electronics, IEEE Journal of
