InP lasers integrated into photonics process

1 min read

Imec has announced that it, along with Sivers Photonics and ASM AMICRA Microtechnologies, has fabricated wafer-scale integration of InP distributed feedback (DFB) lasers from Sivers’ InP100 platform onto Imec’s silicon photonics platform (iSiPP).

By using ASM AMICRA’s latest NANO flip-chip bonder tool, the InP DFB laser diodes it was possible to bond onto a 300mm silicon photonics wafer with an alignment precision within 500nm, enabling reproducible coupling of more than 10mW of laser power into the silicon nitride waveguides on the silicon photonics wafer.

Supported by its partners, Imec will offer this technology later in 2021 as a prototyping service, thereby accelerating the adoption of silicon photonics in a wide range of applications from optical interconnects, over LiDAR, to biomedical sensing.

Many silicon photonic systems today still rely on external light sources, owing to the lack of efficient on‐chip light sources. Silicon itself does not emit light efficiently and, therefore, light sources made of III-V semiconductors, such as indium-phosphide (InP) or gallium-arsenide (GaAs), are typically implemented as separately packaged components.

However, these off‐chip lasers often suffer from higher coupling losses, a large physical footprint and a high packaging cost.

Together with its partners Sivers and ASM AMICRA, Imec is extending its silicon photonics prototyping services to include high-precision flip-chip integration capability of InP lasers and amplifiers.

In the recently completed development phase, C-band InP DFB lasers have been passively aligned and flip-chip bonded onto 300mm silicon photonics wafers with ultra-high alignment precision within 500nm (three-sigma value), resulting in reproducible on-chip waveguide-coupled laser power beyond 10mW.

Throughout the second half of 2021, the hybrid integration portfolio will be extended with reflective semiconductor optical amplifiers (RSOA), leveraging the etched-facet capability of Sivers’ InP100 technology, and ASM AMICRA NANO’s superior bonding alignment precision.

This capability will enable advanced, external cavity laser source types, as required for emerging optical interconnect and sensing applications, and will become available in early 2022.