The ALQ28-LR4-20 from 10Gtek Transceivers is a Fiber Optic Transceiver with Data Rate 100 Gb/s, Wavelength 1269 to 1332 nm (LWDM), Distance/Reach 20 km, Output Power -2.5 to 4.5 dBm, Receiver Sensitivity -14.5 to 4.5 dBm. More details for ALQ28-LR4-20 can be seen below.