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Ultracompact and large-bandwidth silicon modulator in a CMOS-compatible foundry.

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Researchers developed a novel silicon modulator using slow-light effects for optical interconnects. This breakthrough achieves high bandwidth in a compact size, offering energy-efficient solutions for data centers.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Exponential growth in global data traffic necessitates advanced data center solutions.
  • Conventional electro-optic modulators struggle with a bandwidth-footprint trade-off, limiting optical interconnect performance.
  • Photonic interconnects are crucial for overcoming bandwidth limitations in modern computing.

Purpose of the Study:

  • To demonstrate a silicon modulator that overcomes the bandwidth-footprint trade-off in optical interconnects.
  • To leverage the slow-light effect for enhanced modulator performance.
  • To achieve high-speed and energy-efficient data transmission for data centers.

Main Methods:

  • Fabrication of a silicon modulator utilizing a photonic crystal nanobeam cavity.
  • Exploitation of the slow-light effect to enhance electro-optic modulation.
  • Characterization of the modulator's bandwidth, footprint, tuning efficiency, and energy consumption.

Main Results:

  • Achieved a 110-GHz electro-optic bandwidth with an ultracompact footprint of 10 µm².
  • Demonstrated precise light manipulation with 80 pm/V tuning efficiency in a 0.12 µm³ mode volume.
  • Successfully transmitted 110-Gbps and 130-Gbps non-return-to-zero signals with low bit error rates at 5.9 fJ/bit power consumption.

Conclusions:

  • The demonstrated silicon modulator overcomes the critical bandwidth-footprint trade-off in photonic interconnects.
  • The device offers ultra-high energy efficiency, paving the way for next-generation optical interconnects.
  • This technology is vital for developing ultracompact, high-speed, and energy-efficient data centers.