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Proceedings Paper

Optical feedback from extremely short external cavity in VCSEL
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Paper Abstract

Vertical-cavity surface-emitting lasers (VCSELs) have now entered the stage of implementation in optical devices and networks. Besides the number of properties superior to EEL, VCSELs have the drawback of less stabilized polarization. As any semiconductor laser, VCSELs are sensitive to Optical Feedback (OF) due to parasitic reflections inevitable in practical applications. Here we experimentally and numerically investigate the spectral and polarization properties of VCSELs subject to polarization insensitive optical feedback from an extremely short external cavity -ESEC (few microns). We observe that the total output power and the wavelength of laser emission are sinusoidally, in-phase modulated with the external cavity (EC) length and with a period equal to half the wavelength of the VCSEL. Moreover the currents at which the switches between the two linearly polarized (LP) modes happen and the hysteresis width are also sinusoidally modulated with the same period. When biasing the VCSEL at the switching current polarization switching between two orthogonal linearly polarized states happens at different EC lengths. This polarization switching happens through a hysteresis when decreasing and increasing the EC length. We have also develop a two modes rate equation model that proves and explains the changes of all VCSEL characteristics observed in the experimental part, showing very good agreement with the experimental results.

Paper Details

Date Published: 8 September 2004
PDF: 12 pages
Proc. SPIE 5453, Micro-Optics, VCSELs, and Photonic Interconnects, (8 September 2004); doi: 10.1117/12.545071
Show Author Affiliations
Mikel Arizaleta, Vrije Univ. Brussel (Belgium)
Miren Camarena, Vrije Univ. Brussel (Belgium)
Heiko J. Unold, Univ. Ulm (Germany)
Johannes M. Ostermann, Univ. Ulm (Germany)
Rainer Michalzik, Univ. Ulm (Germany)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)
Krassimir Panajotov, Vrije Univ. Brussel (Belgium)
Institute of Solid State Physics (Bulgaria)

Published in SPIE Proceedings Vol. 5453:
Micro-Optics, VCSELs, and Photonic Interconnects
Hugo Thienpont; Kent D. Choquette; Mohammad R. Taghizadeh, Editor(s)

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