The PASSION project will develop new photonic technologies for supporting agile metro networks, enabling capacities of Tb/s per channel, 100 Tb/s per link and Pb/s per node over increased transport distances. A new metro network infrastructure is envisioned, fitting the network operator roadmap and targeting at least a tenfold reduction in components energy consumption and footprint. These breakthroughs are achieved by developing all the essential photonic building blocks. On the transmitter side a novel 3D stacked modular design will be developed combining a silicon photonics (SiPh) circuit layer with directly modulated high-bandwidth 1550nm VCSELs light sources. At the receiver side we will develop novel InP based coherent receiver arrays which handle polarization on chip making polarization handling off chip unnecessary. Finally, we will develop a compact and cost-effective switching concept which can support the Pb/s capacities generated by the transceiver modules, using a combination of InP and SiPh PICs. Increased system flexibility and modularity is obtained by sliceable bandwidth/bitrate variable transceivers. The resulting solution will offer scalability, programmability and re-configurability using agile aggregation in spectrum, polarization and space dimensions. PASSION will contribute to reinforce European industrial technological leadership in high-capacity photonic devices and sub-systems, addressing the growing market of metro network scenarios, improving business opportunities in Europe. The PASSION consortium includes universities, research centres, device manufacturers, a supplier of communication equipment and a network operator addressing the entire value chain. The strong industrial commitment is demonstrated through the presence of two large enterprises and four SMEs, which will identify the path to industrial exploitation, standardization and commercialization, while universities and research centres will support the scientific dissemination.