A new design for concurrent implementation of all-optical half-adder and AND & XOR logic gates based on nonlinear photonic crystal ring resonator has been proposed. The finite different time domain and plane wave expansion methods are used to analyze the behavior of the structure. The ring resonator has a low switching time of about 0.85 ps and low switching power equal to $$277\,\text{ mW}/\upmu \text{m}^{2}$$
 . The simulation results show that the contrast ratio is 12.78 dB for AND gate and 5.67 dB for XOR gate. Moreover, the operational wavelength of the input ports is $$1.55\,\upmu \text{m}$$
 . Since the structure has a simple geometric shape with clear operating principle, it is potentially applicable for photonic integrated circuits.

Concurrent implementation of all-optical half-adder and AND & XOR logic gates based on nonlinear photonic crystal

Implementation of full-adder and full-subtractor based on electro-optic effect in Mach–Zehnder interferometers

In this paper, we propose to implement an all-optical XOR gate for 160 Gb/s return-to-zero data signals using a single quantum-dot semiconductor optical amplifier (QD-SOA) assisted by a detuned optical filter (OF). These two elements are connected in series in a probe-dual pump configuration. By conducting numerical simulations, we thoroughly investigate and assess the impact of the critical performance parameters on the Q2-factor. The analysis of the obtained results against this metric enables us to specify the data signals peak power, QD-SOA small signal gain, current density, electron relaxation time from the excited state to the ground state and linewidth enhancement factor, and OF detuning, bandwidth and shape, for which the XOR logic is executed at the target data format and rate both with logical correctness and high quality. The confirmation of its design feasibility combined with its simplicity and ultrafast capability makes the XOR gate scheme promising for exploitation in all-optical signal processing and switching applications.

All-Optical XOR Gate Using Single Quantum-Dot SOA and Optical Filter

Design of micro-ring resonator based all-optical parity generator and checker circuit

Micro-ring resonator based all-optical reconfigurable logic operations

Interferometric devices have drawn a great interest in all-optical signal processing for their high-speed photonic activity. Quantum-dot semiconductor optical amplifier (QD-SOA)-based gate has added a new momentum in this field to perform all-optical logic and algebraic operations. In this paper, a new and alternative scheme for all-optical half adder using two QD-SOA-based Mach-Zehnder interferometers is theoretically investigated and demonstrated. The proposed scheme is driven by the pair of input data streams for one switch between which the Boolean xor function is to be executed to produce sum-bit. Then the output of the first switch and one of the input data are utilized to drive the second switch to produce carry-bit. The impact of the peak data power as well as of the QD-SOAs current density, small signal gain, and QD-SOAs length on the ER and Q-factor of the switching outcome are explored and assessed by means of numerical simulation. The operation of the system is demonstrated with 160 Gbit/s.

Ultrafast All-Optical Half Adder Using Quantum-Dot Semiconductor Optical Amplifier-Based Mach-Zehnder Interferometer

All-optical 4-bit binary to binary coded decimal converter with the help of semiconductor optical amplifier-assisted Sagnac switch

All-optical 4-bit binary to 2's complement converter has been designed with the help of Terahertz optical asymmetric demultiplexer (TOAD) switches The paper describes all-optical conversion scheme using a set of all-optical switches 2's complement is common in computer systems and is used in binary subtraction and for logical manipulation The operations of the circuit are studied theoretically and analyzed through numerical simulations

4-bit all-optical binary to two's complement converter

All-optical 5-bit binary coded decimal (BCD) to binary converter has been designed with the help of Semiconductor Optical Amplifier (SOA) — assisted Sagnac switches. Binary is handy because we can easily use something physical to represent numbers. We use laser source for incoming pulse and input data. When it is on, it means 1-state and when it is off, it means 0-state. The paper describes all-optical conversion scheme using a set of all-optical NOT and AND gates. The circuit can perform the conversion at very high speed. The operations of the circuit are studied theoretically. We also make the simulation of this proposed circuit.

All-optical binary coded decimal to Binary converter with the help of terahertz asymetric demultiplexer based switch

1's complement of a number is the inversion of the given number. As an example 1's compliment of a number (10100)2 is (01011)2. To convert a number to its 1's compliment equivalent we require NOT gate. In this paper we have designed n-bit all optical 1's compliment conversion circuit. We require n-numbers of NOT gate to design this circuit. All optical NOT gate can be designed with Terahertz optical asymmetric demultiplexer (TOAD) based switch. Here we require n-numbers of TOAD based switches to design this circuit. The circuit performance is verified through numerical simulations.

Arunava Bhattachryya

Papers

Ultrafast All-Optical Half Adder Using Quantum-Dot Semiconductor Optical Amplifier-Based Mach-Zehnder Interferometer

All-optical 4-bit binary to binary coded decimal converter with the help of semiconductor optical amplifier-assisted Sagnac switch

4-bit all-optical binary to two's complement converter

All-optical binary coded decimal to Binary converter with the help of terahertz asymetric demultiplexer based switch

Design of all-optical n-bit 1's complement conversion circuit