OTU1H4 is a compact and high-density photoelectric optical converter, which can realize wavelength conversion, 3R and optical signal amplification. It can be used in combination with Mux / Demux in DWDM network. It needs to be deployed with OA and DCM for long distance application. The board supports 40G/100G QSFP28/QSFP+ client side. It is suitable for 40G/100G Ethernet, data center and other scenarios.