Taking light to the limit: The Nokia Photonic Service Engine 3 (PSE-3) is the industry’s most advanced coherent digital signal processor (DSP) and powers the latest generation of Nokia wavelength division multiplexing, packet-optical transport, and data center interconnect (DCI) platforms. Supporting probabilistic constellation shaping and high baud rates, the PSE-3 sets new industry benchmarks for optical performance and flexibility. Its novel approach to programmability simplifies network operations and planning.