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Posted On: 03/30/2018 7:46:46 PM
Post# of 22465
Crunch, that article is based on old MBE tech. There are now VCSEL colloidal QD lasers that bypass the 'growing QD' process on a wafer. MBE QD is ok for researchers, but colloidal QD enable low cost manufacture of high-efficiency lasers at precise wavelengths.
One example:
Integration of an O-band VCSEL on silicon photonics with polarization maintenance and waveguide coupling https://doi.org/10.1364/OE.25.005758
Abstract
We demonstrate the hybrid integration of an O-band vertical-cavity surface-emitting laser (VCSEL) onto a silicon photonic chip using a grating coupler that is optimized to simultaneously provide feedback to maintain the single emission polarization and efficient in-plane coupling. The grating coupler was fabricated on silicon-on-insulator using a standard silicon photonics foundry process, and integrated with a commercially available VCSEL. A transparent VCSEL submount was fabricated with femtosecond laser templating and chemical etching to simplify the passive and active alignment steps. A record-high VCSEL-to-chip coupling efficiency of −5 dB was obtained at a bias current of 2.5 mA. The slope efficiency and output power are competitive with microcavity hybrid silicon lasers. The results show the feasibility of VCSELs as low threshold current on-chip sources for silicon photonics.
© 2017 Optical Society of America
One example:
Integration of an O-band VCSEL on silicon photonics with polarization maintenance and waveguide coupling https://doi.org/10.1364/OE.25.005758
Abstract
We demonstrate the hybrid integration of an O-band vertical-cavity surface-emitting laser (VCSEL) onto a silicon photonic chip using a grating coupler that is optimized to simultaneously provide feedback to maintain the single emission polarization and efficient in-plane coupling. The grating coupler was fabricated on silicon-on-insulator using a standard silicon photonics foundry process, and integrated with a commercially available VCSEL. A transparent VCSEL submount was fabricated with femtosecond laser templating and chemical etching to simplify the passive and active alignment steps. A record-high VCSEL-to-chip coupling efficiency of −5 dB was obtained at a bias current of 2.5 mA. The slope efficiency and output power are competitive with microcavity hybrid silicon lasers. The results show the feasibility of VCSELs as low threshold current on-chip sources for silicon photonics.
© 2017 Optical Society of America
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