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Related Experiment Videos

Monolithic optical link in silicon-on-insulator CMOS technology.

Satadal Dutta, Vishal Agarwal, Raymond J E Hueting

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    This study demonstrates a wide-spectrum optical link using silicon light-emitting diodes (LEDs) and photodiodes (PDs) in CMOS technology. An integrated heat sink significantly reduces thermal coupling, enabling efficient optical communication.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Silicon photonics is crucial for integrated optical links.
    • Wide-spectrum optical communication requires efficient light sources and detectors.
    • Thermal management is a key challenge in integrated optoelectronic devices.

    Purpose of the Study:

    • To present a monolithic, wide-spectrum optical link in silicon-on-insulator CMOS technology.
    • To analyze optical coupling in both avalanche-mode and forward-mode silicon light-emitting diodes (LEDs).
    • To investigate the impact of thermal coupling and evaluate heat sink effectiveness.

    Main Methods:

    • Fabrication of a silicon (Si) LED and Si photodiode (PD) using vertical abrupt n+p junctions.
    • Optical coupling analysis under various designs and bias conditions for LED operation modes.

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  • DC and pulsed transient measurements to assess thermal coupling and heat sink performance.

    • Main Results:

    • Demonstrated a monolithic, laterally-coupled optical link with a wide spectrum (350 nm to 1270 nm).
    • Identified slow thermal coupling (ms time constants) from avalanche-mode LED to PD due to heating.
    • Showcased a ∼ 6x reduction in PD junction temperature change with an integrated heat sink.

    Conclusions:

    • The developed optical link is suitable for wide-spectrum applications in CMOS technology.
    • Thermal management strategies, like integrated heat sinks, are vital for reliable optical link performance.
    • This work enables integrated wide-spectrum optical links for smart power technologies.