Memory devices having optical I/O interfaces are described herein. In one embodiment, a memory device includes a plurality of memories coupled to a substrate, each memory including one or more photon integrated (PIC) chips for converting electrical signals to/from optical signals. The memory device can further include a plurality of optical fibers, wherein individual ones of the memories are optically coupled to at least one of the optical fibers. The memories can receive/transmit the optical signals over the optical fibers and can be electrically coupled to a power supply/ground via the substrate.