Tag Archives: OPTO

Output beam engineering with 2-step ridge etching

Presented in: SPIE OPTO 2023 Authors: Riina Ulkuniemi, Ville Vilokkinen, Petri Melanen, Petteri Uusimaa    Presented in: SPIE OPTO 2023 Authors: Riina Ulkuniemi, Ville Vilokkinen, Petri Melanen, Petteri Uusimaa   Silicon photonics offers platforms to build mass-producible optical circuits. Extremely small optical components are required for this purpose, so fiber coupled systems are an order of magnitude too large. In order to successfully integrate laser source to the circuits, output beam properties have to be controlled and desired for the purpose. When fabricating single-mode ridge waveguide (RWG) laser diodes, ridge width has to be narrow enough for ensuring single-mode operation. Continue reading →

High-density single-mode laser arrays for quantum systems

Published in: SPIE OPTO 2022 Authors: Riina Ulkuniemi, Petri Melanen, Jari Nikkinen, Jari Ovaskainen, Petteri Uusimaa  Published in: SPIE OPTO 2022 Authors: Riina Ulkuniemi, Petri Melanen, Jari Nikkinen, Jari Ovaskainen, Petteri Uusimaa Quantum systems have highly variable requirements and tailored solutions depending on the technology. For instance, lasers are used for quantum control of particles or molecules and excitation for quantum systems. For the latter purpose, suitable applications are frequency comb generation, timing sources for picosecond pulses, and single photon emitters. Key performance parameters for lasers used in this area are single-mode operation, narrow linewidth, and frequency stability. Wavelength of the lasers Continue reading →

High temperature AlGaInAs-based 25g DML-DFB lasers operating in O-band for data center use

Published in: SPIE OPTO 2021 Authors: Antti Saarela, Petri Melanen, Ville Vilokkinen, Luukas Kuusela, Petteri Uusimaa, Pekko Sipilä, Riina Ulkuniemi, Ossi Mäkinen  Published in: SPIE OPTO 2021 Authors: Antti Saarela, Petri Melanen, Ville Vilokkinen, Luukas Kuusela, Petteri Uusimaa, Pekko Sipilä, Riina Ulkuniemi, Ossi Mäkinen Hyperscale datacenters are driving the growth of datacom laser diode market. Small wavelength drift over temperature, small footprint and low power consumption makes directly modulated distributed feedback (DFB) lasers ideal for uncooled operation in intra-datacenter interconnects. DFB lasers require significantly less process steps than electro absorption modulated lasers (EMLs), used typically for higher speeds and longer distances. AlGaInAs-based lasers are exceptionally desirable for uncooled operation compared to InGaAsP because of the Continue reading →