Optical communication system, master station device, slave station device, and optical communication method

A master station device, comprising:

• a generation unit configured to generate a digital signal including one frame in which plural pieces of control information are stored;
• and
• a transmission unit configured to transmit an optical signal including the digital signal generated by the generation unit, and an analog main signal, to another device via an optical fiber.

A slave station device, comprising:

• a reception unit configured to receive an optical signal that includes a digital signal including one frame in which plural pieces of control information are stored, and an analog main signal, from another device via an optical fiber;
• and
• an acquisition unit configured to acquire at least one control information out of the plural pieces of control information, from the digital signal included in the optical signal received by the reception unit.

An optical communication method in an optical communication system including a master station device and a slave station device, the method comprising:

• by the master station device, generating a digital signal including one frame in which plural pieces of control information are stored, and transmitting an optical signal including the generated digital signal and an analog main signal, to the slave station device via an optical fiber;
• and
• by the slave station device, acquiring at least one piece of control information out of the plural pieces of control information, from the digital signal included in the optical signal received from the master station device via the optical fiber.