Figure 6

(a) Measured (blue points) and modeled (blue lines) signal Q-factors and measured BER (red lines) vs. sourced laser power (lower x-axis) and average power at the receiver (upper x-axis) at 14 and 25 Gbps. (b) Dependence of the measured BER on measured signal Q-factor for both data rates and comparison with the theoretical curve derived from Gaussian noise statistics (black line). The dashed red curve shows the modeled Q-factor at 25 Gbps assuming in addition a system jitter of 17.2 ps further discussed in the Supplementary Materials. (c) Real-time transmitter eye diagram recorded at 25 Gbps with 0 dBm of laser power (typical power of the isolated MLL comb lines). Note that the commercial photo-receiver used to record the eye is inverting and the optical levels have thus been flipped.