Patent ID: 8824896

Claim:
A system for optical open space data communication using digital signals, the system comprising a transmitting device and an optical receiver and using multiple, varying levels of emitted radiation outputs, wherein the transmitting device comprises multiple emitter groups that are capable of being switched on and off, each of which is capable of being activated in parallel to emit fixed, varying radiation outputs, wherein a total radiation output emitted by the transmitting device is defined by a sum of the emitted radiation outputs of the emitter groups, wherein to transmit a bit vector (b 0 . . . b n ) an emitter group assigned to a most significant bit (b 0 ) emits a maximum radiation output P max and emitter groups assigned to less significant bits (b 1 . . . b n ) of the bit vector emit radiation outputs P x =P max /2 x , where x=1 . . . n.