Experimental comparison of modulation formats for 200 G/λ IMDD data centre networks

We experimentally evaluate and compare the performance of IMDD modulation formats including duobinary PAM-4, PAM-6, trellis-coded two-dimensional PAM-8, and DMT for 200G per lambda data centre applications using commercial components. The achievable link budget, FEC and DSP requirement are major criteria for the evaluation.