Optical modules are optoelectronic devices that perform photoelectric and electro-optical conversion. The transmitting end of the optical module converts electrical signals into optical signals, while the receiving end converts optical signals into electrical signals. Optical modules are classified according to their packaging forms, commonly including SFP, SFP+, SFF, Gigabit Ethernet Road Interface Converter (GBIC), etc.
The transmission part is to input a certain bit rate electrical signal, which is processed by an internal driving chip to drive a semiconductor laser (LD) or light-emitting diode (LED) to emit a modulated optical signal at a corresponding rate. The internal part is equipped with an optical power automatic control circuit to keep the output optical signal power stable.
The receiving part is: the optical signal with a certain bit rate is input into the module and converted into an electrical signal by the photodetector diode. After passing through the preamplifier, the corresponding bit rate electrical signal is output.
