• Method of implementing frequency-encoded NOT, OR and NOR logic operations using lithium niobate waveguide and reflecting semiconductor optical amplifiers

    • Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Nonlinear optics; sum and difference frequency generation; optical filter; LiNbO3 crystal; semiconductor optical amplifier; optical logic gates; add and drop multi-plexer.

    • Abstract


      Optics has already proved its strong potentiality for the conduction of parallel logic, arithmetic and algebraic operations. In the last few decades several all-optical data processors were proposed. To implement these processors different data encoding/decoding techniques have been reported. In this context, polarization encoding technique, intensity-based encoding technique, tristate and quaternary logic operation, multivalued logic operations, symbolic substitution techniques etc. may be mentioned. Very recently, frequency encoding/decoding technique has drawn interest from the scientific community. Frequency is the fundamental character of any signal; and it remains unaltered in reflection, refraction, absorption etc. during the propagation and transmission of the signal. This is the most important advantage of frequency encoding technique over the conventional encoding techniques. In this communication the authors propose a new scheme for implementing NOT, OR and NOR logic operations. For this purpose co-propagating beams having different frequencies in C-band (1535–1560 nm) have been used for generating cascaded sum and difference frequency, exploiting the nonlinear response character of periodically poled LiNbO3 waveguide. The cross-gain modulation property of the semiconductor optical amplifier (SOA) and the wavelength conversion property of the reflecting semiconductor optical amplifiers (RSOA) are exploited here to implement the desired optical logic and arithmetic operations.

    • Author Affiliations


      Sisir Kumar Garai1 Sourangshu Mukhopadhyay2

      1. Department of Physics, M.U.C. Women’s College, Burdwan 713 104, India
      2. Department of Physics, The University of Burdwan, Burdwan 713 104, India
    • Dates

  • Pramana – Journal of Physics | News

© 2017-2019 Indian Academy of Sciences, Bengaluru.