Title :
Integrated laser Mach-Zehnder modulator on indium phosphide free of modulated-feedback
Author :
Lovisa, Stéphane ; Bouché, N. ; Helmers, Håkon ; Heymes, Yvon ; Brillouet, François ; Gottesman, Yaneck ; Rao, Krishna
Author_Institution :
Opto+, Marcoussis, France
Abstract :
The main problem of integrated laser/Mach-Zehnder modulators is the modulated feedback due to reflections on the output multimode image (MMI). We have solved this problem changing the modulator technology from "deep-ridge" to "shallow-ridge" technology. In that case, the index step seen by the light in the MMI is far lower, then reflections which are nondetectable in optical low coherence reflectometry (OLCR) and there is no laser resonance left. This technology also enables a wider bandwidth (thanks to a stronger electrooptic effect) and a higher output power (better coupling between laser and modulator and lower loss of shallow-ridge guides).
Keywords :
III-V semiconductors; distributed feedback lasers; electro-optical modulation; indium compounds; integrated optics; laser feedback; light reflection; optical waveguide components; reflectometry; ridge waveguides; semiconductor lasers; InP; bandwidth; coupling; deep-ridge technology; electrooptic effect; index step; integrated laser Mach-Zehnder modulator; laser; laser resonance; modulated feedback; modulated-feedback; modulator; modulator technology; optical low coherence reflectometry; output multimode image; output power; reflections; shallow-ridge guides; shallow-ridge technology; Bandwidth; Indium phosphide; Laser feedback; Lasers and electrooptics; Optical feedback; Optical modulation; Optical reflection; Output feedback; Reflectometry; Resonance;
Journal_Title :
Photonics Technology Letters, IEEE
