Transmission apparatus, transmission method, and recording medium of transmission program

A transmission method in an optical submarine apparatus included in an optical submarine cable system performing optical communication through an optical submarine cable, the transmission method comprising:

• detecting a first command signal superposed on a first optical signal traveling through the optical submarine cable in a first direction;
• detecting a first response signal being a response signal to the first command signal and being superposed on a second optical signal traveling through the optical submarine cable in a second direction by a first separate optical submarine apparatus being an optical submarine apparatus other than an own optical submarine apparatus;
• superposing, on the second optical signal, a first response signal being a response signal to the first command signal a destination of which is the own optical submarine apparatus, when a first stage being a stage of first transmission permission information is a first setting stage;
• and
• updating the first stage, based on a detection completion count of the first command signal the destination of which is the first separate optical submarine apparatus and a detection completion count of the first response signal.

A tangible and non-transitory recording medium of a transmission program on which a program is recorded, the program causing a computer included in an optical submarine apparatus included in an optical submarine cable system performing optical communication through an optical submarine cable to execute:

• processing comprising detecting a first command signal superposed on a first optical signal traveling through the optical submarine cable in a first direction;
• processing comprising detecting a first response signal being a response signal to the first command signal and being superposed on a second optical signal traveling through the optical submarine cable in a second direction by a first separate optical submarine apparatus being an optical submarine apparatus other than an own optical submarine apparatus;
• processing comprising superposing, on the second optical signal, a first response signal being a response signal to the first command signal a destination of which is the own optical submarine apparatus, when a first stage being a stage of first transmission permission information is a first setting stage;
• and
• processing comprising updating the first stage, based on a detection completion count of the first command signal the destination of which is the first separate optical submarine apparatus and a detection completion count of the first response signal.