We report on the optimization of a scalable optical interfacing approach for silicon photonics based on adiabatic optical coupling between tapered silicon waveguides and single-mode polymer waveguides. Different taper-designs and assembly methods were investigated to minimize the coupling loss for both polarizations. We could demonstrate very low coupling losses per interface down to < 1.0 dB for TE and < 0.5 dB for TM across the entire O-band. Moreover, first TE-measurements in the C-band with the same assembly and design showed even lower coupling losses below 0.5 dB.
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