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<p>In this paper, authors propose and design a new all-optical frequency encoded signed 1-bit half subtractor based on two-dimensional (2D) photonic crystal structure. The proposed half subtractor system can perform the binary subtraction between two 1-bit numbers by realizing difference bit and sign bit. To design the proposed structure, some photonic crystal semiconductor optical amplifiers (PC-SOAs), optical filters, and linear waveguides have been used. The switching operation has been achieved by exploiting cross-gain modulation property of PC-SOAs. This proposed structure operates within the frequency range of 0.574548 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2819_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="46" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{\mu\:m}^{-1}\)</EquationSource> </InlineEquation> − 0.840877 <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2819_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="46" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{\mu\:m}^{-1}\)</EquationSource> </InlineEquation>. The dimension of wafer used for this proposed structure is 1479 µm<sup>2</sup>. The response time of the structure is 0.67 ps and is capable of operating at a bit rate of 1.5 Tbps. These results are obtained by the simulation experiment with opti-FDTD software. Due to its fast response time and high bit rate, the proposed optical half subtractor has the potentiality to be used in optical micro-computing, data processing, and integrated circuits.</p>

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Frequency encoded all-optical signed 1-bit half subtractor using photonic crystal-based semiconductor optical amplifiers

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Ayan Dey,
  • Mir Nadim Sarfaraj,
  • Snigdha Hazra,
  • Debashri Saha,
  • Sourangshu Mukhopadhyay

摘要

In this paper, authors propose and design a new all-optical frequency encoded signed 1-bit half subtractor based on two-dimensional (2D) photonic crystal structure. The proposed half subtractor system can perform the binary subtraction between two 1-bit numbers by realizing difference bit and sign bit. To design the proposed structure, some photonic crystal semiconductor optical amplifiers (PC-SOAs), optical filters, and linear waveguides have been used. The switching operation has been achieved by exploiting cross-gain modulation property of PC-SOAs. This proposed structure operates within the frequency range of 0.574548 \(\:{\mu\:m}^{-1}\) − 0.840877 \(\:{\mu\:m}^{-1}\) . The dimension of wafer used for this proposed structure is 1479 µm2. The response time of the structure is 0.67 ps and is capable of operating at a bit rate of 1.5 Tbps. These results are obtained by the simulation experiment with opti-FDTD software. Due to its fast response time and high bit rate, the proposed optical half subtractor has the potentiality to be used in optical micro-computing, data processing, and integrated circuits.