Optical signal transmission method for optical information communications

摘要

The optical signal transmission method has at least part of the signal transmission path between a signal source (Tx) and a signal drain (Rx) provided with a parallel redundant signal path to which the transmitted optical information signal is diverted when the main signal path is indicated as having a fault using bidirectional test signals transmitted alongside the optical information signal. Two types of test signals are respectively used as indicators for an intact signal path and a faulty signal path. An Independent claim for an optical line network is also included.