Patent ID: 6643040
Filing Date: 2003-11-04
Classification: G02F,H04B

Abstract:
A device for converting a binary digital optical signal in the RZ format having a bit time into a binary digital optical signal in the NRZ format characterized in that it comprises:an optical bistable means having an input and an output, an output logic level of this optical bistable means passing from a low level to a high level when a power level present at input passes from a level below a first threshold S1 to a level above this first threshold S1 and passing from a high level to a low level when the power level present at input passes from a level above a second threshold to a level below this second threshold, the second threshold being below the first threshold, the output of this optical bistable means carrying the NRZ format signal; a means for converting the binary digital optical signal in the RZ format into a control signal of an output logic level of the optical bistable means, this conversion means having an input and an output, this means receiving, at its input, the RZ signal to be converted and delivering at its output said control signal, said output being coupled to the input of the optical bistable means, the conversion means producing a signal the level of which becomes above the first threshold when a signal present at the input of this circuit passes from a low logic level present for more than one bit time to a high logic level and remains at a level above the second threshold so long as the input signal does not return for more than one bit time to a low logic level, and producing a signal having a level below the second threshold when a signal present at the input of this means passes from a high logic level to a low logic level and remains there for more than one bit time.