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

Volume

3

Issue

4

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

366

Lastpage

368

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.82114

Filename

82114