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Compact light couplers for lateral III-V membrane devices grown on SOI platforms
Optics Letters- received 03/21/2024; accepted 04/10/2024; posted 04/16/2024; Doc. ID 524405
- Abstract: Compact light couplers between III-V devices and Si waveguides are crucial for advancing the scalability of Si photonics. Here, we present a compact light coupling strategy for lateral III-V membrane lasers and PDs directly grown on SOI platforms. Benefiting from the coplanar configuration of epitaxial III-V membrane and Si device layer, we designed novel butt couplers to achieve both small footprint and high efficiency coupling. We employed sub-wavelength grating structures to gradually bridge the effective refractive index between III-V membrane and Si waveguide and obtained a coupling loss of less than 0.5 dB across the entire telecom band in a length of less than 10 μm. Our work here offers a fresh perspective for future densely-integrated Si-photonics.