BIDIRECTIONAL OPTICAL TRANSMISSION METHOD AND APPARATUS THEREFOR

摘要

A method and an apparatus for bidirectional optical transmission capable of communicating in the bidirection through a single optical transmission path are disclosed. A light traveling in one direction is modulated by a first base band signal and another light traveling in another direction is modulated by a subcarrier signal which is modulated by a second base band signal for subsequent conversion into the binary digit pulse. A light receiving circuit for receiving the light traveling in said another direction is comprised of a synchronizing detection demodulator and at least a light receiver to which an electrical signal synchronizing to the subcarrier signal is applied.