QSFP-DD optical module, QSFP-DD optical fiber module, QSFP-DD 200G optical module, QSFP-DD 200G optical fiber module, QSFP-DD 400G optical module, QSFP-DD 400G optical fiber module; currently QSFP28 optical module has four electrical channels. Each channel operates at 10Gbps or 25Gbps and supports 40G and 100G Ethernet applications.