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Multiple optical carrier generation using frequency mixing in damage resistant multiple QPM device.

Kazuki Nakamura, Hin Channa, Masaki Asobe

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    |March 1, 2017
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    Summary
    This summary is machine-generated.

    Researchers developed a method to measure phase-matching curves in lithium niobate waveguides for high-power applications. This technique preserves phase-matching conditions, enabling the generation of multiple phase-correlated optical carriers for coherent wavelength division multiplexing (WDM).

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Nonlinear Optics

    Background:

    • High-power second-harmonic generation (SHG) in lithium niobate (LiNbO3) waveguides is crucial for optical device applications.
    • Maintaining phase-matching conditions under high optical power is a significant challenge.
    • Directly bonded LiNbO3 waveguides offer potential for enhanced stability and damage resistance.

    Purpose of the Study:

    • To develop and validate a method for measuring the phase-matching curve of multiple quasi-phase-matched (QPM) LiNbO3 waveguides under high-power SHG.
    • To investigate the preservation of phase-matching conditions in directly bonded LiNbO3 waveguides.
    • To demonstrate the generation of multiple, phase-correlated optical carriers for advanced optical communication systems.

    Main Methods:

    • Measurement of the phase-matching curve for multiple QPM LiNbO3 waveguides during high-power SHG.
    • Evaluation of the damage resistance and phase-matching stability of directly bonded LiNbO3 waveguides.
    • Multi-stage frequency mixing within the QPM device to generate multiple optical carriers.
    • Generation and transmission of a 20 Gb/s quadrature phase shift keying (QPSK) signal using the generated optical carriers.

    Main Results:

    • The developed method successfully measured the phase-matching curve of multiple QPM LiNbO3 waveguides.
    • High damage resistance of the directly bonded LiNbO3 waveguide preserved the phase-matching condition under high optical power.
    • Multiple phase-correlated optical carriers were successfully generated via multi-stage frequency mixing.
    • A 20 Gb/s QPSK signal was demonstrated with good signal quality, confirming the suitability for coherent WDM.

    Conclusions:

    • Directly bonded LiNbO3 waveguides are robust for high-power nonlinear optical processes.
    • The developed measurement technique is effective for characterizing QPM devices under demanding conditions.
    • The generation of phase-correlated optical carriers is a viable approach for advanced coherent WDM systems.