1000Base-LH40 SFP optical module is a high-performance, cost-effective module that supports a transmission rate of 1 Gbps and an SMF transmission distance of 10km. The optical module consists of three parts: a FP laser transmitter, a PIN photodiode, a transimpedance preamplifier (TIA) and MCU control unit. All modules meet the first-class laser safety requirements. The optical module is compatible with SFP multi-source agreement (MSA) and SFF-8472.