OPTICAL COMMUNICATION INTERFACE

摘要

PROBLEM TO BE SOLVED: To realize an optical communication interface by which a distributed control system capable of communication among plural devices connected to an optical transmission line is configured without changing a communication protocol. SOLUTION: A transmission signal TX and a signal delaying the signal TX by a delay circuit 1103a are inputted to an AND circuit 1103b to be a signal with a time width where a prescribed delay time is subtracted. An output signal from a distortion correction circuit 1103 is supplied to a pulse width detection circuit 1108 and recognizes occurrence of collision of signals when the signals have the pulse width of 1-bit time or over. A reception signal from an optical receiver 1102 is inputted to an AND circuit 1105 in which the signal is ANDed with a transmission reception identification signal from a pulse width magnification circuit 1107 and a logic inverting circuit 1106. The magnification circuit 1107 extends an output period of a valid signal by a period more than a total signal propagation delay time stored through a transmission line. The signal of which the time width of the valid signal is extended by a prescribed time is supplied from the magnification circuit 1107 to an OR circuit 1105 via the inverting circuit 1106.