SFP 1.25G WDM 1310/1550NM SM 20KM SC single-mode modules set. Bidirectional SFP modules are high-performance, cost-effective  single-mode SFP modules supporting data transfer rates 1.25 Gbps/1.0625 Gbps and transmission ranges up to 20 km with SMF. The fiber optic SFP module consists of three sections, i.e. FP laser transmitter, PIN photodiode integrated with transimpedance preamplifier (TIA) and MCU control unit. All SFP optical modules meet Class I laser safety requirements. The bidirectional SFP 1.25G SFP modules comply with SONET OC-24-LR-1 and the RoHS directive.