[EN] We propose a PAM-4 modulation scheme with unequally spaced levels in order to
mitigate chirp effects caused by IQ modulators. Experimental results of 56 Gb/s transmission over
25 km link demonstrate the robustness of ...
[EN] We investigate partial response signaling (PRS) as a way of increasing the transmission length achievable by direct detection optical systems. The performance of the duobinary and PRS modulations is evaluated against ...