Method and apparatus for transmission of optical data between two electrically separated transmitting receiving units

A method for the optical data transmission of data between first and second transmitter-receivers which are spaced apart;

• said first and second transmitter-receivers each has a data transmitter and a data receiver;
• the first transmitter-receiver has a light transmitter for transmitting light energy;
• the second transmitter-receiver has a light receiver for receiving the light energy transmitted by said first transmitter-receiver and said second transmitter-receiver has means for converting and storing the received light energy into electrical energy,
• characterized by the successive steps of:
• (a) transmitting by said first transmitter-receiver light energy for a predetermined time, receiving said light energy at said second transmitter-receiver and converting it inot electrical energy and storing said electrical energy to energize said second transmitter-receiver,
• (b) sending with the data transmitter of said first transmitter-receive an auxiliary synchronization pulse during said predetermined time;
• (c) simultaneously shutting off the emission of the light energy and of the auxiliary synchronization pulse at said first transmitter-receiver,
• (d) and detecting and using the two, simultaneously appearing shut-off edges at the second transmitter-receiver as a synchronization signal.