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Ultrahigh-speed Si-integrated on-chip laser with tailored dynamic characteristics.

Gyeong Cheol Park1, Weiqi Xue1, Molly Piels1

  • 1Department of Photonics Engineering (DTU Fotonik), Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

Scientific Reports
|December 10, 2016
PubMed
Summary

We developed an ultrahigh-speed microcavity laser using a transverse magnetic high-contrast grating mirror. This laser achieves high speed at low currents, offering a promising solution for energy-efficient on-chip optical interconnects.

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Area of Science:

  • Photonics and Optical Engineering
  • Semiconductor Devices
  • Integrated Optics

Background:

  • On-chip interconnects require light sources with low energy consumption and high output power.
  • Nanocavity lasers offer low operating energy but struggle with sufficient output power.
  • Existing solutions face challenges in balancing speed, power, and energy efficiency.

Purpose of the Study:

  • To propose and demonstrate an ultrahigh-speed microcavity laser structure.
  • To overcome the output power limitations of nanocavity lasers.
  • To achieve high-speed operation at low injection currents for optical interconnects.

Main Methods:

  • Designed a vertical cavity microcavity laser with a high-contrast grating (HCG) mirror for transverse magnetic (TM) polarization.

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  • Utilized the TM HCG to achieve a small mode volume and compact optical feedback.
  • Optically pumped the laser at 1.54-μm wavelength and measured its 3-dB frequency response.

    • Main Results:

    • Achieved a 3-dB frequency of 27 GHz at a sub-milliampere pumping level.
    • Demonstrated a modulation current efficiency factor (MCEF) of 42.1 GHz/mA1/2, superior to existing microcavity lasers.
    • Confirmed lateral light emission into a silicon waveguide.

    Conclusions:

    • The proposed TM HCG microcavity laser offers a pathway to very high speeds at low injection currents.
    • This technology holds significant potential for reducing heat generation in high-bitrate applications.
    • The laser is highly desirable for both on-chip and off-chip optical interconnects due to its efficiency and speed.