Components receiver is consists of Front End, Linear Channel, Data Recovery.










Optical ReceiverFront End
Photodiode: To change the optical signal into electric current.
Preamplifier: To strengthen the signal for the next.

Linear channel
Main Amplifier: Automatically controlled to limit the output voltage.
Low Pass Filter: Voltage to form a useful balance to reduce noise.

Data Recovery
Decision circuit: To compare the output of the linear channel to the level.
threshold and decide whether the signal is a bit "1" or bit "0".
Circuit Clock Recovery: Synchronous decision-making process.