Fig. 4. Up to 200 Gbit s⁻¹ operating at elevated temperature.

a Normalized Q factors (dB) of the synthesized OOK signals at 56, 100 and 110 Gbit s⁻¹ as a function of the operating ambient temperature (25–110 °C). Inset: measured optical eye diagrams of 56 and 100 Gbit s⁻¹ OOK signals at elevated temperature (105 °C). The unnormalized Q factors versus the operating ambient temperatures can be found in Supplementary Figure 4. b Measured BERs of 200 Gbit s⁻¹ Nyquist PAM4 versus operating ambient temperatures (22–110 °C). The solid red solid line represents the fitted curve. Inset: measured optical eye diagrams of 200 Gbit s⁻¹ Nyquist PAM4 at temperatures of 100 and 110 °C.