Title :
Influence of higher order modes on angled-facet amplifiers
Author :
Wang, Z. ; Mikkelsen, B. ; Stubkjaer, K.E.
Author_Institution :
Electromagn. Inst., Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
4/1/1991 12:00:00 AM
Abstract :
The influence of the first-order mode on the residual reflectivity of angled-facet amplifiers is analyzed. For a 7 degrees angled-facet ridge waveguide amplifier with a single-layer antireflective (AR) coating, a gain ripple lower than 1-dB at 25-dB gain can be obtained independent of the polarization, even in the presence of a first-order mode with a 15-dB gain. The tolerances for the thickness and refractive index of the AR coating are reduced by a factor of three compared to operation in the fundamental mode only. The influence of the higher order mode can virtually be suppressed by increasing the facet angles to 10 degrees .<>
Keywords :
antireflection coatings; laser modes; laser theory; optical waveguide theory; reflectivity; semiconductor junction lasers; 15 dB; 25 dB; angled-facet amplifiers; coating thickness; first-order mode; gain ripple; higher order modes; refractive index; residual reflectivity; ridge waveguide amplifier; semiconductor laser; single-layer antireflective coating; Coatings; Electromagnetic waveguides; Gain; Optical coupling; Planar waveguides; Polarization; Reflectivity; Refractive index; Waveguide junctions; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
