Fig. 4. MmWave power versus number of comb lines and dispersion.

a MmWave power at 100 GHz for different number of comb lines at four different photocurrents. The measurements agree very well with the theoretical calculation results based on Eq. (1), which are shown as dashed lines. b Corresponding optical spectra of two, twelve, and twenty-two comb line measurements in panel (a). c MmWave power versus dispersion compensation added by the waveshaper, d_c. The maximum output power is reached at d_c=−1.95 ps/nm, where the dispersion from the fibre and EDFA is completely compensated. A theoretical curve from Eq. (2) is shown as dashed line and agrees very well with the measurement. The PD diameter and bias voltage are indicated in each panel