Optical communication system and optical communication method

An optical communication system having a station apparatus and multiple subscriber resident apparatuses connected to the station apparatus and sending/receiving data by optical communication between the station apparatus and the multiple subscriber resident apparatuses,

• wherein the station apparatus selects a specific subscriber resident apparatus among the multiple subscriber resident apparatuses as a selected subscriber resident apparatus, generates transmission permission issuance information for issuing data transmission permission to the selected subscriber resident apparatus, and sends the transmission permission issuance information to the multiple subscriber resident apparatuses, and
• wherein each of the multiple subscriber resident apparatuses receives the transmission permission issuance information sent from the station apparatus, checks if the transmission permission issuance information is destined to a subscriber resident apparatus itself, sends predetermined data to the station apparatus as upward main data when the transmission permission issuance information is destined to the subscriber resident apparatus itself, and does not send any data to the station apparatus when the transmission permission issuance information is not destined to the subscriber resident apparatus itself.