  Passive Time-of-Flight (ToF) imaging can be enabled by optical wireless
communication (OWC). The lighting infrastructure is the backbone of emerging
light-based wireless communication. To this end, communication sources are used
as opportunity illuminators to probe the scene, and an array of time-resolved
pixels are exploited to demodulate the return, provided that the ToF camera can
be externally synchronized. Our work employs a direct line-of-sight path to
synchronize the camera externally. Together with the indirect path given by the
reflections from the scene, this yields a bistatic configuration. Each
Time-of-Flight (ToF) measurement induced a solution space of ellipsoidal shape
and redefined the image formation model based on the bistatic configuration. In
this demo, we showcase a passive ToF camera capable of delivering intensity and
depth information in practice without emitting photons from the ToF camera. Our
passive modality can eliminate built-in illumination sources, thus coping with
optical power constraints, as is desired in future ToF cameras.
