1. A phase-based time-of-flight (TOF) system including a primary output source adapted to emit first energy S out having a modulation frequency ω and a phase φ, and a time of flight sensor which detects incoming signal S in , which is at least a fraction of emitted said first energy that is reflected-back by a target object a distance Z away, and is adapted to determine said distance Z from a shift in said phase φ in S in , said TOF system comprising: at least one auxiliary wireless optical emitting (WOE) unit that includes at least one optical sensor for receiving a portion of S out and is adapted to output second energy S out-n at a frequency and phase derived from the received portion of S out ; wherein said first energy and second optical energy are adapted to be received by said time of flight sensor in replicated modulation frequency and phase as optical energy S out emitted by said TOF system when reflected by said target object.