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Pure phase modulation based on a silicon plasma dispersion modulator.

Hong Deng, Wim Bogaerts

    Optics Express
    |November 2, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a configurable modulator circuit to eliminate spurious intensity modulation in silicon photonic circuits. This method significantly suppresses unwanted intensity variations, enabling pure phase modulation for advanced communication and photonics applications.

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    Area of Science:

    • Silicon Photonics
    • Optical Modulators
    • Integrated Optics

    Background:

    • Plasma dispersion modulators (PDMs), including carrier injection and depletion types, are crucial for high-speed phase modulation in silicon photonics.
    • A significant challenge with PDMs is their inherent spurious intensity modulation, which degrades performance in coherent communication and microwave photonics.
    • This intensity modulation complicates complex modulation formats and limits analog signal fidelity.

    Purpose of the Study:

    • To propose and demonstrate a novel method for achieving pure phase modulation using PDMs.
    • To compensate for and suppress spurious intensity modulation in silicon photonic circuits.
    • To enhance the applicability of PDMs in demanding optical communication and analog systems.

    Main Methods:

    • Implementation of a configurable modulator circuit based on a Mach-Zehnder interferometer (MZI).
    • Integration of a PDM and tunable couplers (TCs) within the MZI architecture.
    • Compensation of spurious intensity modulation by precisely tuning the coupling ratios of TCs and the phase delay between MZI arms.

    Main Results:

    • For carrier depletion modulators, spurious intensity modulation was reduced from 1.26 dB to 0.023 dB over a 0.4π phase range.
    • For carrier injection modulators, spurious intensity modulation was suppressed from 1.27 dB to 0.07 dB over a 0.76π phase range.
    • The proposed method effectively mitigates intensity modulation, achieving near-pure phase modulation.

    Conclusions:

    • The configurable modulator circuit offers an effective solution to suppress spurious intensity modulation in PDMs.
    • This technique significantly improves the performance of silicon photonic modulators for advanced applications.
    • The results pave the way for more robust and high-fidelity optical communication and microwave photonics systems.