Difference between Optical Amplifier and Regenerator

Optical Amplifier and Regenerator both deal with increasing the signal power. Here is the difference between two:

Optical Amplifier Regenerator
Increases the optical power of signal New signal is generated
It is an all optical process i.e. optical signal is not converted to electrical It is an Optical-Electrical-Optical process. The reason it involves electronics is that building an all optical generator capable of deciding what is signal and what is noise is difficult. It’s a three stage process:1)Reshaping = > O-E 2) Re-amplification => Optical 3) Retiming => O-E
Multiplexed signals can be amplified together Operates on single channel of data
No upgrades required with frequency upgrade High frequency upgrades requires regenerator upgrades
Introduces noise Removes noise

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