5G-PHOS is a H2020 5GPPP Phase II project focusing on 5G integrated Fiber-Wireless networks that leverage existing photonic technologies towards implementing a high-density SDN-programmable network architecture. The project has a duration of 3 years, from 01/09/2017 until 31/08/2020, comprising a consortium of 16 partners and coordinated by Aristotle University of Thessaloniki. 5G-PHOS steps into invest in and exploit integrated optical technologies towards enhancing Fiber-Wireless (FiWi) convergence and realizing cost-effective and energy-efficient 5G network solutions for high density use cases. 5G-PHOS is the first coordinated attempt that will draw from existing scientific results in the area of photonics in order to architect 5G networks for dense, ultra-dense and Hot-Spot areas incorporating Photonic Integrated Cirtuits (PICs) in optical mmWave signal generation, DSP-assisted optical transmission, reconfigurable optical add/drop multiplexing (ROADM) and optical beamforming functionalities. 5G-PHOS expects to release a seamless, interoperable, RAT-agnostic and SDN-programmable FiWi 5G network that supports 64x64 MIMO antennas in the V-band.