How to choose the suitable single mode fiber optic media converter |fiber optic transceiver? When you only have one optic fiber how to choose the suitable fiber optic media converter| fiber optic transceiver? ? Usually , the fiber optic cable is dulplex optic fiber : one fiber is used for received signal;the other one used for transmitting signals. However , the single fiber is use a fiber optic cable to transmit and received signals simultaneously. According to the principle of different wavelengths of light can not communicate. The transmission of at least two different wavelengths of light in single mode fiber .Signal transmit and receive simultaneously to reach the results. Therefore, in the selection of fiber optic transceivers also requires a separate purchase. Common fiber optic transceivers can be used alone, it can also be used in pairs. However, single fiber transceiver must be used in pairs, in general, this is the end to end is R5T3 R3T5 (R / T 1550NM / 1