Carrier-suppressed 160 GHz pulse-train generation using a 40 GHz phase modulator with polarization-maintaining fiber

We demonstrate chirp-free carrier-suppressed return-to-zero pulse generation with a repetition rate of 160 GHz using a phase modulator driven by a 40 GHz clock with two-stage polarization-maintaining fibers. The unwanted low-frequency tones are suppressed by more than 25 dB.