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

Nobuhide Yokota, Ryo Igarashi, Hiroshi Yasaka

    Optics Letters
    |April 29, 2017
    PubMed
    Summary

    We present a straightforward method for generating optical Nyquist pulses using a dual-electrode Mach-Zehnder modulator (MZM). This technique achieves efficient pulse generation with a specific roll-off factor, confirmed experimentally.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Signal Processing

    Background:

    • Optical pulse generation is crucial for high-speed communication systems.
    • Existing methods for generating optical Nyquist pulses can be complex or inefficient.

    Purpose of the Study:

    • To demonstrate a simple and efficient method for generating optical Nyquist pulses.
    • To achieve precise control over pulse shaping parameters like the roll-off factor.

    Main Methods:

    • Utilizing a dual-electrode Mach-Zehnder modulator (MZM).
    • Driving the MZM with a combination of fundamental and second-harmonic radio frequency (RF) signals.
    • Implementing a raised-cosine-shaped time filter and time lens within the MZM.

    Main Results:

    • Experimentally confirmed generation of optical Nyquist pulses with a roll-off factor of 0.52.
    • Achieved an intrinsic conversion efficiency of 37%.
    • Numerical analysis showed roll-off factor control down to approximately 0.3 by adjusting RF signal strength.

    Conclusions:

    • The demonstrated method offers a simple and efficient approach to optical Nyquist pulse generation.
    • The technique allows for moderate control over the roll-off factor, enhancing its versatility.
    • This method has potential applications in advanced optical communication systems.