Demonstration of post-growth wavelength control of VCSELs using high-contrast gratings
Preprint, 2015

We demonstrate post-growth wavelength setting of vertical-cavity surface-emitting lasers (VCSELs) using high-contrast gratings (HCGs). By fabricating HCGs with different duty-cycle and period, the HCG reflection phase can be varied, in effect giving different optical cavity lengths for HCGVCSELs with different grating parameters. This enables fabrication of monolithic multi-wavelength HCG-VCSEL arrays for wavelength-division multiplexing (WDM). The GaAs HCG is suspended in air by selective removal of an InGaP sacrificial layer. Electrically injected 980-nm HCGVCSELs with sub-mA threshold currents indicate high reflectivity from the GaAs HCGs. Lasing over a wavelength span of 15 nm was achieved, enabling a 4-channel WDM array with 5 nm channel spacing. Device design, fabrication and experimental proof-of-concept are presented.

Wavelength division multiplexing

CWDM

VCSELs

Optical waveguides

Surface emitting lasers

High reflectivity

Semiconducting gallium

Gallium arsenide

Optical interconnects

High-contrast gratings

Sacrificial layer

Threshold currents

High contrast grating

Transceivers

Electrically injected

Diffraction gratings

Wavelength control

Författare

Erik Haglund

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Johan Gustavsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Jörgen Bengtsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Åsa Haglund

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Anders Larsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

David Fattal

W. V. Sorin

Hewlett Packard Laboratories

Michael Tan

Hewlett Packard Laboratories

HP Laboratories Technical Report

1368-6798 (ISSN)

Ämneskategorier

Annan elektroteknik och elektronik