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Updated: Jun 13, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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Published on: September 5, 2019

An all-optical signal processor enabling terabit-per-second real-time equalization.

Benshan Wang1, Qiarong Xiao1, Tengji Xu1

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.

Science (New York, N.Y.)
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces an optical signal processor (OSP) for faster, more efficient AI training interconnects. The OSP offers real-time, all-optical equalization, significantly reducing latency and power consumption in graphics processing unit clusters.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Last Updated: Jun 13, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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Published on: September 5, 2019

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Optical Engineering
  • Artificial Intelligence Hardware
  • Telecommunications

Background:

  • Large-scale AI training requires high-speed, low-latency, energy-efficient interconnects for GPU clusters.
  • Digital signal processing (DSP) equalization in intensity-modulation/direct-detection links faces limitations due to phase loss, power, and latency constraints.

Purpose of the Study:

  • To present an integrated, programmable optical signal processor (OSP) for DSP-free, real-time equalization.
  • To overcome the limitations of current DSP equalization methods in high-performance computing interconnects.

Main Methods:

  • Development of an OSP featuring a deep reservoir with all-optical readout for a Vernier scheme.
  • Implementation of ~1-picosecond sampling resolution and a tunable memory window.
  • Simultaneous equalization of eight wavelength-division-multiplexing (WDM) channels.

Main Results:

  • Achieved 1.6-terabits/second aggregate throughput with <60-picoseconds latency.
  • Demonstrated energy consumption in the tens of femtojoules/bit.
  • Provided superior chromatic dispersion compensation and mitigation of transceiver bandwidth limits and fiber nonlinearity.

Conclusions:

  • The OSP enables all-optical, DSP-free, real-time equalization, functioning as a nonlinear universal equalizer.
  • Expanded the usable WDM window by a factor of 6.8, enhancing optical link performance.
  • Offers a promising solution for ultralow-latency, energy-efficient interconnects crucial for AI training.