Photonic circuits are designed in three sub tasks to showcase the use of PIC100 technology for three different fields of applications. Each relates to a corresponding demonstrator development subtask in WP5. A 4-channel PIC with 100 GBd symbol rate using a PAM4 modulation format is developed in subtask 4.1.1 and will be integrated in the datacom demonstrator for IMDD intra-data center applications in subtask 5.1.1. The photonic circuits in subtask 4.1.2 contain photonic crystal structures which are implemented in demonstrators for advanced filtering techniques in subtask 5.3.3 as well as photonic reservoir computing in subtask 5.2.4. In subtask 4.1.3, a coherent-lite O-band Tx/Rx PIC for coherent data interconnects is developed, targeting a total data rate of 3.2 Tbit/s. In T4.1.4, a multi-channel transceiver PIC for analog radio over fibre is developed to remove the power-hungry digital signal processing from the 6G antenna unit. In 4.1.5 PIC for RAN optical switch will be developed and will serves as an optical switching node within a ring network.