Optical modules transmit signals over optical fibers. Optical transmission features low loss and is fit for long distance transmission.
Optical transceivers are mainly used for optical-to-electrical and electrical-to-optical conversions and provide the following functions: optical power control, modulation transmission, signal probe, IV conversion, and limiting amplifier and decision regeneration. In addition, transceivers provide some other functions, such as counterfeit-prevention query and TX-disable.