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Variable optical attenuators based on SOI with 3  μm top silicon layer.

Pei Yuan, Yue Wang, Yuanda Wu

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    This study optimized electro-absorption variable optical attenuators (VOAs) for lower power consumption. Key factors like doping distance, width, depth, and concentration were adjusted, leading to significant power reduction in silicon-on-insulator devices.

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    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Variable optical attenuators (VOAs) are crucial components in optical networks.
    • Silicon-on-insulator (SOI) technology offers advantages for integrated photonic devices.

    Purpose of the Study:

    • To investigate and optimize the design of electro-absorption VOAs (EA-VOAs) on SOI for reduced power consumption.
    • To analyze the impact of various doping parameters on VOA performance.

    Main Methods:

    • Simulated the influence of doping distance, width, depth, concentration, and length on VOA power consumption at 20 dB attenuation.
    • Fabricated EA-VOAs with varied doping structures and dimensions.
    • Experimentally verified theoretical findings through device testing.

    Main Results:

    • Reduced power consumption achieved by decreasing doping distance and width, and increasing doping depth and concentration.
    • Theoretical demonstration of power reduction through increased doping length and series configuration.
    • Fabricated series VOA achieved 470 mW power consumption at 20 dB attenuation with specific doping parameters (8 μm distance, 15 μm width, 1 cm length, 1x10^19 cm^-3 concentration, 0.9 μm depth).
    • Achieved fast switching times of 54 ns rising and 49.5 ns falling.

    Conclusions:

    • Optimized doping parameters significantly reduce power consumption in SOI-based EA-VOAs.
    • The study provides a clear design guideline for low-power, high-performance VOAs.
    • Experimental results validate the theoretical analysis, confirming the effectiveness of the proposed optimization strategies.