Optically-coupled memory systems are disclosed. In one embodiment,
a system memory includes a carrier substrate, and a controller attached to the
carrier substrate and operable to transmit and receive optical signals, and first
and second memory modules. The module substrate of the first memory module has
an aperture formed therein, the aperture being operable to provide an optical path
for optical signals between the controller and an optical transmitter/receiver
unit of the second memory module. Thus, the system memory provides the advantages
of "free space" optical connection in a compact arrangement of memory modules.
In an alternate embodiment, the first memory module includes a beam splitter attached
to the module substrate proximate the aperture. In another embodiment, the first
and second memory modules are staged on the carrier substrate to provide an unobstructed
path for optical signals. In another embodiment, the optical transmitter/receiver
unit projects outwardly from the module substrate to provide an unobstructed path
for optical signals.