Gigaopto's 200G QSFP56 series of optical transceivers support the demands of an evolving technology environment and optimize optical links in modern networking and storage systems. They use 4x50Gb/s PAM4 lanes to achieve 200GE. This transceiver consists a transmitter/receiver unit operating on a set of 4 wavelengths on the ITU G.694.2 CWDM grid near 1300nm or 4 channels 850nm wavelength. The electrical interface of this module complies with the 200GAUI-4 interface defined by IEEE 802.3bs. This portfolio includes SR4 100m, FR4 2km and LR4 10km, etc. The optical transceiver is RoHS compliant.