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Multi-photon lithography has emerged as a powerful tool for photonicintegration, allowing to complement planar photonic circuits by 3D-printedfreeform structures such as waveguides or micro-optical elements. Thesestructures can be fabricated with high precision on the facets of opticaldevices and lend themselves to highly efficient package-levelchip-chip-connections in photonic assemblies. However, plain light transportand efficient coupling is far from exploiting the full geometrical designfreedom that is offered by 3D laser lithography. Here, we extend thefunctionality of 3D-printed optical structures to manipulation of opticalpolarization states. We demonstrate compact ultra-broadband polarization beamsplitters (PBS) that can be combined with polarization rotators (PR) andmode-field adapters into a monolithic 3D-printed structure, fabricated directlyon the facets of optical devices. In a proof-of-concept experiment, wedemonstrate measured polarization extinction ratios beyond 11 dB over abandwidth of 350 nm at near-infrared (NIR) telecommunication wavelengths around1550 nm. We demonstrate the viability of the device by receiving a 640 Gbit/sdual-polarization data signal using 16-state quadrature amplitude modulation(16QAM), without any measurable optical-signal-to-noise-ratio (OSNR) penaltycompared to a commercial PBS.

Ultra-broadband polarization beam splitter and rotator based on 3D-printed waveguides