C20 DWDM-SFP25G-61.41 Cisco Compatible, 25G DWDM SFP28 100GHz 1561.41nm 10km DOM LC SMF Fiber Optical Transceiver Module GLsun's DWDM-SFP25G-10-C20-T02 single-mode transceiver is SFP28 module for duplex optical data communications support up to 25.78Gb/s. It is with the SFP+ 20-pin connector to allow hot plug capability. Digital diagnostic functions are available via an I C. It has built-in clock and data recovery (CDR). This module is designed for single-mode fiber. https://www.glsunmall.com/product/dwdm-sfp25g-61-41-optical-transceiver-module.html