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alistu
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Hi Dhiman,

Again this is the case I have explained earlier in your post “photodiode”, in the link below:

Photodiode

In case you are using 4-QAM, then you have two inputs to your QAM demodulator (or 4-QAM), whereas in the image you have attached there is only one output port to your coherent optical receiver, which enters QADM.

Regards

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