Pulse-frequency modulated injection laser

Claim 1

A PULSE-FREQUENCY MODULATION TRANSMISSION DEVICE, COMPRISING: A SOURCE OF MODULATED DIRECT CURRENT, THE MAGNITUDE OF SAID CURRENT VARYING IN PROPORTION TO THE AMPLITUDE VARIATION OF AN INFORMATION BEARING VOLTAGE SIGNAL; CAPACITANCE MEANS IN SERIES WITH SAID CURRENT SOURCE FOR STORING A CHARGE AT A RATE PROPORTIONAL TO THE MAGNITUDE OF SAID CURRENT; NORMALLY OPEN SWITCH MEANS IN PARALLEL WITH SAID CAPACITANCE MEANS, SAID SWITCH MEANS BEING ADAPTED TO CLOSE WHEN THE VOLTAGE ON SAID CAPACITANCE MEANS REACHES A PREDETERMINED MAXIMUM LEVEL AND TO OPEN WHEN THE CURRENT THROUGH SAID SWITCH MEANS REACHES A PREDETERMINED MINIMUM LEVEL, THEREBY PRODUCING A SERIES OF CAPACITANCE DISCHARGE PULSES OCCURRING AT INTERVALS DESCRIPTIVE OF THE MAGNITUDE OF SAID MODULATED CURRENT; AND A LASER DEVICE IN SERIES WITH SAID SWTICH MEANS, AND LASER DEVICE EMITTING, UNDER THE INFLUENCE OF SAID DISCHARGE PULSES, A SERIES OF RADIATION PULSES HAVING A REPETITION RATE CORRESPONDING TO THAT OF SAID SERIES DISCHARGE PULSES.