A processor issues a command to a memory through an electrical memory link and performs a process according to the command through the electrical memory link. The processor issues a routing command to an optical circuit switch (OCS) through an OCS control line. In response to the routing command, the OCS establishes a routing of an optical memory link from the processor to the BDM. In response to the establishment of the optical memory link from the processor to the BDM, the processor (or a BDM (internal/dedicated) controller) switches from performing the process through the electrical memory link to performing a process through the optical memory link (continuously without an interruption between the successive processes). Corresponding systems are also disclosed herein.