Cause why the VOA embedded on an OA board on the main optical path of a coherent system must be configured on the OUT port of the board

In a coherent system, the VOA embedded on an OA board must be configured on the OUT port of the board. This position change helps adjust the incident optical power and also helps adjust the input optical power of the receive-end OA board in the downstream direction. This requirement decreases non-linear effect and helps improve the system performance.

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