Accelight’s 25G SFP28 CWDM LR series optical transceiver is designed for fiber communications application up to 25.78Gbps, which fully compliant with the specification of SFF-8402. This module is designed for single mode fiber and operates at a nominal wavelength of CWDM wavelength. There are six center wavelengths available from 1271nm to 1371nm, with each step 20nm.It can communicate over single mode fibers (SMF) of length from 2m to at least 10km. The module is with the SFP+ connector to allow hot plug capability. Single 3.3V power supply is needed. The optical output can be disabled by LVTTL logic high-level input of TX_DIS. Loss of signal (RX_LOS) output is provided to indicate the loss of an input optical signal of receiver. This module provides digital diagnostic functions via a 2-wire serial interface as defined in the SFF-8472 specification