Abstract
An all-optical 3:8 decoder unit with the help of terahertz optical asymmetric demultiplexer (TOAD) is proposed. The all-optical 3:8 decoder unit with a set of all-optical full-adders and optical exclusive-ORs (XORs), can be used to perform a fast central processor unit using optical hardware components. We try to exploit the advantages of TOAD-based optical switch to design an integrated all-optical circuit which can perform decoding of signal. A theoretical model is presented and verified through numerical simulation. The new method promises both higher processing speed and accuracy. The model can be extended for studying more complex all-optical circuit of enhanced functionality in which decoder is the basic building block. The operation of the proposed circuit is parallel in nature. The impact of the switching energy with small signal gain and variation of extinction ratio and contrast ration with control pulse energy of the switching outcome is explored and assessed by means of numerical simulations.
Highlights
The development of different ultrafast all-optical switches has received considerable interest all over the world in recent years for future optical computing and information processing
To study the operation of the circuit, we find the appropriate value of the semiconductor optical amplifier (SOA) small signal gain for which switching energy is minimized
The proposed scheme has been verified with numerical simulations
Summary
The development of different ultrafast all-optical switches has received considerable interest all over the world in recent years for future optical computing and information processing. A revolution has been brought about in all-optical information processing system with the help of the discovery of ultra high speed all-optical switches based on cross phase modulation. Ghosh et al have proposed a new scheme of implementing a wavelength encoded complete binary full-adder and full-subtractor unit in all-optical domain using the wavelength conversion by the nonlinear polarization rotation in a single semiconductor optical amplifier [21]. J. Wang et al have proposed all-optical simultaneous half-adder, half-subtractor, and OR logic gate at 40 Gbit/s based on the cascaded sum and difference-frequency generation using periodically poled lithium niobate waveguide [23]. A terahertz-optical-asymmetric demultiplexer (TOAD)-based gate has already taken a significant role in the field of ultrafast all-optical information processing. The operation of the proposed circuit is parallel in nature
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