Semiconductor packages are provided. The semiconductor package includes a first redistribution layer structure, a photonic integrated circuit, an electronic integrated circuit, a waveguide and a memory. The photonic integrated circuit is disposed over and electrically connected to the first redistribution layer structure, and includes an optical transceiver and an optical coupler. The electronic integrated circuit is disposed over and electrically connected to the first redistribution layer structure. The waveguide is optically coupled to the optical coupler. The memory is electrically connected to the electronic integrated circuit.