Demonstration of post-growth wavelength control of VCSELs using high-contrast gratings
Share- Author(s): Haglund, E.; Gustavsson, J.S.; Bengtsson, J.; Haglund, A.; Larsson, A.; Fattal, D.; Sorin, W.; Tan, M.
- HP Laboratories
- HPL-2015-70
- Keyword(s): High Contrast Grating; VCSELs; CWDM; Optical interconnects
Abstract: 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 HCG-VCSELs 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 HCG- VCSELs 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.
6 Pages
- External Posting Date: External Posting Date: August 21, 2015 [Fulltext]. Approved for External Publication
- Internal Posting Date: Internal Posting Date: August 21, 2015 [Fulltext]