Abstract: Frames of sensor data may be obtained from many sensors arranged throughout a facility. These frames may be time synchronized to support further processing. For example, frames containing image data obtained at about the same time from many cameras within the facility may be used to create an aggregate or “stitched” view of the facility at that time. The synchronization may involve storing the frames from several sensors in buffers. A time window may be specified and used in conjunction with timestamps of the frames to select a set of sensor data from the buffers that are deemed to be synchronized data. The synchronized data may then be used for further processing.

Abstract: A tap detector monitors an optical signal propagating through a waveguide as a portion of the optical signal is tapped and directed to the monitor detector. A precisely formed grating structure formed within the waveguide surface causes a portion of the propagating optical signal to be coupled out of the waveguide at a particular angle. The grating structure produces an angular separation of light propagating through the waveguide in opposite directions and which is directed out of the waveguide by the grating structure. A monitor detector is positioned to detect the light tapped from the optical signal and to avoid being influenced by any other signals that may be propagating in a direction opposite the optical signal and that are diffracted out of the waveguide by the grating structure.