Fig. 5: Data experiment of MZ modulator
From: The plasmonic BTO-on-SiN platform – beyond 200 GBd modulation for optical communications
a Data experiment results of the MZ modulator. It reaches 256 GBd using 2PAM, 170 GBd using 4PAM, and 96 GBd using 8PAM, while staying below the SD-FEC limit with 20% overhead. With simplified DSP consisting of linear equalization only, we reach 196 GBd below the SD-FEC and 160 GBd below the KP4-FEC limit. b BER as a function of the taps in the LMS filter. We compare 140 GBd with the 160 and 196 GBd. Only a small number of taps are required for the 140 GBd signal. Still, a minimum of 3 is necessary to equalize. For the 160 GBd 21 taps allow transmission below the KP4-FEC limit. c Eye diagrams of the 400 m fiber transmission using full DSP. In 2PAM, 256 GBd can be transmitted with a BER of 3.11\(\cdot\)10−2. In the 4PAM transmission experiment, the 400 m fiber showed a larger penalty in comparison to back-to-back measurements. 160 GBd was successfully transmitted with a BER of 4.00\(\cdot\)10−2
