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      https://www.ias.ac.in/article/fulltext/pram/096/0174

    • Keywords

       

      Photonic crystals; half adder; T-shaped waveguide; finite-difference time domain; contrast ratio.

    • Abstract

       

      In digital the detection techniques, the half adder is a component of electronic systems that performs calculations faster than the other logic gates. This article focusses on an all-optical half adder logic gate using a two dimensional T-shaped photonic crystal waveguide and silicon in an air medium. The half adder design is predicated on the concept of constructive (in-phase) and destructive (out-of-phase) interferences. The high-intensity output is achieved by carefully selecting the lattice constant, rod radius and refractive index of the half adder structure. The effectiveness of the half adder is investigated using finite-difference time-domain and plane-wave expansion techniques at 1.55 μm wavelength. The suggested structure features a minimal size of 8.4 μm × 8.4 μm. For this structure, the CARRY has a greater contrast ratio of 18.96 dB and SUM of 8.7 dB, as expressed by the results. SUM and CARRY have bit rates of 28.5 Tbps and 23.8 Tbps, respectively. The proposed circuit’s primary objective is to be compact and to have a high contrast ratio.

    • Author Affiliations

       

      MADDALA RACHANA1 SANDIP SWARNAKAR1 NOONEPALLE HARI PRIYA1 SABBI VAMSHI KRISHNA2 PRABHA SHANKAR SHARMA3 SANTOSH KUMAR3 4

      1. Photonics Lab, Department of Electronics and Communication Engineering, G. Pullaiah College of Engineering and Technology, Nandikotkur Road, Kurnool 518 002, India
      2. Department of Electronics and Communication Engineering, Ravindra College of Engineering for Women, Nandikotkur Road, Kurnool 518 452, India
      3. Department of Electrical and Electronics & Communication Engineering, DIT University, Dehradun 248 009, India
      4. Shandong Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, Shandong, People’s Republic of China
    • Dates

       
  • Pramana – Journal of Physics | News

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