Youopto 50G PON three-mode Combo OLT compact optical device is characterized by small size, high coupling efficiency, high reliability. Compared with 10G PON, the 50G PON standard provides five times more access bandwidth and better service support capabilities (large bandwidth, low latency, and high reliability). This optical device is fully suitable for SFP-DD and QSFP-DD module packages, helping the access network to smoothly evolve to 50G PON.