Optical communication device, optical network terminal and communication system

The embodiment of the utility model provides an optical communication device, an optical network terminal and a communication system, and aims to reduce the occupation of the internal space of a circuit board and facilitate the reduction of the area of the circuit board. According to the optical communication device provided by the embodiment of the invention, two-way communication between the user equipment and the communication system can be realized, so that fiber to the room (Fiber To The Room, short for FTTR) is realized. The optical communication device comprises a circuit board, a medium access control chip, a physical layer chip, an optical emission unit and a first flexible connection structure, the first flexible connection structure is arranged outside the circuit board, and the medium access control chip is connected with the physical layer chip through the first flexible connection structure. The first flexible connection structure realizes the electrical interconnection of the medium access control chip and the physical layer chip outside the circuit board, avoids the arrangement of a printed circuit in the circuit board between the medium access control chip and the physical layer chip, reduces the occupation of the internal space of the circuit board, and facilitates the reduction of the area of the circuit board.