TITLE:
Designs of All-Optical Higher-Order Signed-Digit Adders Using Polarization-Encoded Based Terahertz-Optical-Asymmetric-Demultiplexer (TOAD)
AUTHORS:
Ali Hajjiah, Abdullah Alqallaf, Abdallah Cherri
KEYWORDS:
Multiple-Valued Signed-Digit, All-Optical Gates, Polarization-Encoding, Terahertz-Optical-Asymmetric-Demultiplexer (TOAD)
JOURNAL NAME:
Optics and Photonics Journal,
Vol.4 No.6,
June
11,
2014
ABSTRACT: Various designed circuits for multiple-valued all-optical arithmetic are
demonstrated. The terahertz-optical-asymmetric-demultiplexer (TOAD) switch is
used as the basic structure unit in the proposed circuits due to its compact
size, thermal stability, and low power operation. The designs of trinary and
quaternary signed-digit numbers based adders are presented using different
polarized states of light. These proposed polarization-encoded based adders use
much less switches and their speeds are higher than the intensity-encoded
counterparts. Further, it will be shown that one of the proposed trinary
signed-digit adders is twice as fast as a recently reported modified
signed-digit adder.