prevent unwanted reflections

Posted by raviteja on August 8th, 2023

It helps prevent unwanted reflections from returning to the source. When a signal enters an optical fiber amplifier, it passes through a circulator first.

Then, the circulator directs the light to the input of the amplifier.

After that, the circulator sends the light to the output of the amplifier.

At the output of the amplifier, the circulator sends all of the light back to the input of the circulator.

As mentioned earlier, the output of an EDFA provides about 20 dB of gain.

However, the gain is not constant. The more light you add to the system, the greater the gain will be.

The gain increases up to 40 dB.

Once the gain reaches 40 dB, the signal starts getting distorted.

So, if you want to amplify your signal, make sure that the gain never exceeds 40 dB.

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