This Source Photonics SP-GB-SX-CDFA is high performance, cost effective module. It is designed for Gigabit Ethernet applications, which supports 550m transmission with 50/125um MMF. The SP-GB-SX-CDFA incorporates a highly reliable 850nm VCSEL in its transmitter section, and the receiver section. Our Compatible Source Photonics SP-25E-LR-xDFD SFP28 transceiver is based on our 25G-SFP28-10 product, which has the same parameters and is manufactured in accordance with the same industry standards as its OEM counterpart. The transceiver. Source Photonics is a leading global manufacturer of optical communication products, specializing in high-speed transceivers and optical components for data centers, telecommunications, and enterprise networks.