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, an optical receiving unit and a first connecting structure, the first connecting structure is arranged outside the circuit board, the medium access control chip is connected with the optical receiving unit through the first connecting structure, and the first connecting structure realizes electrical interconnection of the medium access control chip and the optical receiving unit outside the circuit board. The arrangement of a printed circuit in the circuit board between the medium access control chip and the light receiving unit is avoided, the occupation of the internal space of the circuit board is reduced, and the area of the circuit board is conveniently reduced.