Optical up-down wave device, optical up-down wave system and optical communication equipment

The embodiment of the invention provides an optical up-down wave device, an optical up-down wave system and optical communication equipment, and is applied to the technical field of optical communication. The optical up-down wave device comprises an adjustable beam splitter and a fixed beam splitter. The adjustable beam splitter comprises a first transmission waveguide structure and an electrode, and the electrode is coupled to the first transmission waveguide structure. The fixed beam splitter includes a second transmission waveguide structure. And the adjustable beam splitter and the fixed beam splitter are coupled to form an optical signal upper wave path structure or form an optical signal lower wave path structure. In the embodiment of the invention, the beam splitter is used for carrying out optical signal up-down wave processing, so that the cost of the optical up-down wave system is greatly reduced. Meanwhile, the splitting ratios of different optical communication devices are adjusted through the adjustable beam splitter, the insertion loss of optical signal transmission is reduced, and the transmission quality of optical signals is improved.