Journal of Engineering Research

, 2:5

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

All-optical polarization-encoded negabinary signed-digit adder designs using terahertz-optical-asymmetric-demultiplexer switches

  • A. K. CherriAffiliated withDepartment of Electrical Engineering, Kuwait University Email author 
  • , N. I. KhachabAffiliated withDepartment of Electrical Engineering, Kuwait University
  • , A. T. HajjiahAffiliated withDepartment of Electrical Engineering, Kuwait University


In contrast to intensity-encoded negabinary modified signed-digit number representation, a polarization-encoding scheme is proposed to design all-optical adders. The utilization of the proposed polarization-encoding produces more efficient circuits in terms of gates numbers and circuit delays. Three all-optical adder circuits are designed using Terahertz-Optical- Asymmetric-Demultiplexer (TOAD) switches, polarization beam splitters, polarization converters, and beam combiners. It will be shown that the proposed circuits utilize 51.7%, 45.5%, and 21% less gates and they are faster by 44.4%, 42.9%, and 40%, respectively, than the corresponding intensity-encoded circuits.


All-optical gates Intensity-encoding Negabinary signed-digit Polarization-encoding Terahertz-optical-asymmetric-demultiplexer