GLSUN 1G CWDM Fiber Optic Transceivers SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gb/s and 40km transmission distance with SMF. The transceiver consists of three sections: an uncooled CWDM DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.