Ultracompact 3D Splitter for Single‐Core to Multi‐Core Optical Fiber Connections Fabricated Through Direct Laser Writing in Polymer (Laser Photonics Rev. 18(11)/2024)

In article number 2400089, Tigran Baghdasaryan and co-workers introduce an unprecedented 3D-printed splitter to tackle key interconnection challenges in the field of spatial division multiplexing.For the proof-ofconcept 1x4 splitter, the pivotal element is a triangular cross-section 3D multimode interference coupler, complemented by S-bends and adiabatic tapers, allowing for an insertion loss of around 3 dB per channel and a remarkably short length of 180 mm.