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<p>This paper presents a novel design of a reconfigurable multi-function logic gate based on a photonic crystal Sagnac interferometer. Operating at the telecommunication wavelength of 1550&#xa0;nm, the proposed device leverages linear interference within a Sagnac loop structure. By reconfiguring the input port assignments and the phase of the reference signal, the same hardware can be dynamically configured to realize seven fundamental logic functions: AND, OR, XOR, NAND, NOR, XNOR, and NOT. The logic gates are numerically investigated via the Finite-Difference Time-Domain (FDTD) method, and their performance is evaluated in terms of contrast ratio, insertion loss, and bit rate. The results demonstrate the potential of the proposed design for photonic integrated circuits and all-optical signal processing systems.</p>

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Design of a multifunctional all-optical logic gate based on a photonic crystal Sagnac loop

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Ming Xu,
  • Qiuyang Song,
  • Zhiwen Xiao,
  • Jianhua Ji,
  • Ke Wang

摘要

This paper presents a novel design of a reconfigurable multi-function logic gate based on a photonic crystal Sagnac interferometer. Operating at the telecommunication wavelength of 1550 nm, the proposed device leverages linear interference within a Sagnac loop structure. By reconfiguring the input port assignments and the phase of the reference signal, the same hardware can be dynamically configured to realize seven fundamental logic functions: AND, OR, XOR, NAND, NOR, XNOR, and NOT. The logic gates are numerically investigated via the Finite-Difference Time-Domain (FDTD) method, and their performance is evaluated in terms of contrast ratio, insertion loss, and bit rate. The results demonstrate the potential of the proposed design for photonic integrated circuits and all-optical signal processing systems.