Fig. 1. Block diagram of the proposed v-band signals and pulses generator scheme. LO, local oscillator; SMF, single mode fiber; OSA, optical spectrum analyzer; OSC, oscilloscope; PD, photodiode; ESA, electrical spectrum analyzer; BERT, bit error rate tester.

Fig. 2. Calculation and simulation results: (a) OCSR versus bias angle θ at calculation (black line) and simulation (red line) cases; (b) OCSR versus bias angle θ with a different extinction ratio (ER).

Fig. 3. Simulation results of the proposed generator when θ equals 157.8°: (a) optical spectrum at the output of the DP-MZM; (b) electrical spectrum at the output of the PD without SMF transmission (red) and with 20 km SMF transmission(blue); (c) BER curves and corresponding eye diagram, BTB transmission (red), 20 km transmission (blue), and power penalty (Δ).

Fig. 4. Simulation and results of OCSR versus bias voltage drift: (a) the voltage drift effect of Vbias_a, Vbias_b, and Vbias_c, respectively; (b) the voltage drift superposition effect of Vbias_a and Vbias_b; (c) the voltage drift superposition effect of Vbias_a, Vbias_b, and Vbias_c. (Note that for ease of expression, ‘+’ represents voltage drift ranges from 0 to +10mV, ‘−’ represents voltage drift ranges from −10 to 0 mV, and ‘a, b, c’ represents the Vbias_a, Vbias_b, and Vbias_c, respectively. For example, ‘+a−b+c’ represents voltage drifts of the Vbias_a and Vbias_c, which ranges from 0 to +10mV, and the voltage drift of Vbias_b, which ranges from −10 to 0 mV.)

Fig. 5. Simulation results of the proposed generator when θ equals 102.6°: (a) optical spectrum at the output of the DP-MZM; (b) the waveforms of the generated triangular-shaped pulses with different pulse durations (100 ps yellow line, 66.7 ps green line, 50 ps red line, 40 ps blue line).

Fig. 6. Simulation results of the proposed generator when θ equals 180°: (a) optical spectrum at the output of the DP-MZM; (b) the waveforms of the generated Nyquist waveform pulses with different pulse durations (100 ps yellow line, 66.7 ps green line, 50 ps red line, 40 ps blue line).