How can I make a simple Tx-fiber-Rx system with QAM modulation? From the existing sample in the optisystem using QAM followed by OFDM, can I use QAM modulation without OFDM? Then, How to measure the BER value? because when I try to make a simple system from QAM samples in https://optiwave.com/resources/applications-resources/optical-system-manchester-and-pam-codingdecodingdigital-modulation-qam/ the BER value is 0
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