This QSFP28 pluggable EDFA preamplifier offers an optical input range and provides a +17dB nominal gain to a C-Band DWDM link. Availability: 3 View Details Explore the benefits of working with us. Get started today! Get. QSFP28 transceiver provides 100GBase-DWDM throughput up to 80km over single-mode fiber (SMF) using a wavelength of 1556. In Find company information you can search current information about Swedish companies for free.