The SFBD-1250A4K3RF from Delta Electronics, Inc. is a Fiber Optic Transceiver with Data Rate 1.2288 Gbps, Wavelength 1310 to 1490 nm, Distance/Reach 20 km, Output Power -5 to 0 dBm, Receiver Sensitivity -20 dBm. More details for SFBD-1250A4K3RF can be seen below.