Channel (broadcasting)

Operating system

CMOS

Computer science

Process (computing)

Optics

Adder

Kerr effect

Constructive

Interference (communication)

Quantum mechanics

Photonics

XOR gate

Phase difference

Optoelectronics

Telecommunications

Algorithm

Logic gate

Contrast ratio

Physics

Nonlinear system

Bandwidth (computing)

Applied Optics

In this paper, we aim to propose an optical structure for realizing half-adder operation without using the nonlinear Kerr effect. Constructive and destructive interference of optical beams is the main working mechanism of the proposed structure. The phase difference required for the destructive interface will be created by choosing different lengths for the input waveguides of the XOR gate. For the proposed structure, the on-off contrast ratios for SUM and CARRY are 9.77 dB and 6.98 dB, respectively. Also, the delay time and footprint of the proposed structure are about 4 ps and 1056 μm2, respectively.

Proposal for realizing an all-optical half adder based on photonic crystals