Optical Nyquist pulse generation by using a dual-electrode Mach-Zehnder modulator.

Optics letters

PubMedID: 28454178

Yokota N, Igarashi R, Yasaka H. Optical Nyquist pulse generation by using a dual-electrode Mach-Zehnder modulator. Opt Lett. 2017;42(9):1856-1859.
We demonstrate a simple and efficient optical Nyquist pulse generation by using a dual-electrode Mach-Zehnder modulator (MZM) driven by a combination of fundamental and second-harmonic RF signals. The method is based on a raised-cosine-shaped time filter and time lens created in the MZM under operation conditions given by a simple equation. Optical Nyquist pulses with a roll-off factor of 0. 52 and intrinsic conversion efficiency of 37% are experimentally confirmed. Numerical analyses indicate that the roll-off factor can be moderately controlled down to ~0. 3 by increasing relative strength of fundamental RF signals.