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250 Gb/s All-Optical XNOR Logic Using a Single QD-SOA-MZI: Demonstration and Comprehensive Performance Analysis.

Amer Kotb1,2, Bisheng Zhu1, Jiali Cui1,3

  • 1School of Chips, XJTLU Entrepreneur College (Taicang), Xi'an Jiaotong-Liverpool University, Taicang 215400, China.

Micromachines
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

This study demonstrates an ultra-fast all-optical XNOR logic gate using a quantum-dot semiconductor optical amplifier (QD-SOA) in a Mach-Zehnder interferometer (MZI). The QD-SOA-MZI gate achieves high speeds and quality factors, crucial for next-generation optical networks.

Keywords:
Mach–Zehnder interferometer (MZI)cross-phase modulation (XPM)exclusive-NOR (XNOR)quality factor (QF)quantum-dot semiconductor optical amplifier (QD-SOA)

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Area of Science:

  • Optoelectronics and Photonics
  • Optical Communications
  • Nonlinear Optics

Background:

  • Optical networks demand faster data rates, necessitating all-optical logic gates to overcome electro-optic conversion limitations.
  • Quantum-dot semiconductor optical amplifiers (QD-SOAs) offer ultrafast carrier dynamics and high nonlinearity, making them suitable for high-speed optical processing.

Purpose of the Study:

  • To numerically simulate and analyze the performance of an all-optical XNOR logic gate.
  • To investigate the operational envelope and optimize critical parameters for a QD-SOA-MZI based gate.
  • To confirm the potential of this device for ultra-high-speed optical communication systems.

Main Methods:

  • Numerical simulation of an all-optical XNOR logic gate implemented with a single QD-SOA in a Mach-Zehnder interferometer (MZI).
  • Performance analysis based on Quality Factor (QF) and theoretical bit-error rate (BER).
  • Systematic investigation of parameter dependence including data rate, pulse energy, probe power, injection current density, and noise tolerance.

Main Results:

  • The QD-SOA-MZI gate operates at 250 Gb/s with a QF of 26.30 (BER < 10-9).
  • The gate maintains QF > 6 up to 700 Gb/s (QF = 10.47), demonstrating robust high-speed capability.
  • Optimal performance is achieved at specific pulse energy (0.20 pJ), probe power (0.40 mW), and injection current density (4 kA/cm2), with defined noise tolerances.

Conclusions:

  • The QD-SOA-MZI all-optical XNOR gate shows significant potential for ultra-high-speed optical signal processing.
  • Parameter optimization is crucial for maximizing performance and ensuring signal integrity in practical applications.
  • This technology offers a compact and efficient solution for future optical communication networks.