Patent ID: 7912376

Claim:
An apparatus comprising: a photo receiver operable to detect a stream of light pulses transmitted from a photo transmitter paired with the photo receiver, wherein a frequency of the stream of light pulses has a harmonic relationship with a frequency of at least one other stream of light pulses transmitted by a photo transmitter not paired to the photo receiver; wherein the stream of light pulses from the transmitter paired with the photo receiver has a pulse width that is different from a pulse width of the at least one other stream of light pulses transmitted by the photo transmitter not paired to the photo receiver, and the stream of light pulses is detectable by the photo receiver even when the photo receiver is receiving one or more light pulses from the at least one other stream of light pulses, and wherein the photo receiver and the photo transmitted that is paired with the photo receiver are not connected by a synchronizing interconnect between the photo transmitter and the photo receiver, and no synchronization is required between the photo receiver and the photo transmitter that is paired with the photo receiver.