Reflective semiconductor optical amplifiers (RSOAs) are versatile gain media that find applications in passive optical networks. Due to their double-pass characteristics, they show better gain compared with ordinary semiconductor optical amplifiers, resulting in better switching performance. In this work, the RSOA-based gain dynamics is utilized to design and analyze a parity checker and generator using soliton pulses. The results of MATLAB simulations at a rate of 200 Gbps show the practical feasibility of such gates. The effect of the amplified spontaneous emission noise on the performance of the logic gate is also investigated.

Numerical simulations of an all-optical parity generator and checker utilizing a reflective semiconductor optical amplifier at 200 Gbps

All optical frequency encoded logic gates XOR and XNOR are designed and simulated using quantum dot semiconductor optical amplifiers (QDSOA) at 1 Tb/s for the first time as far as our knowledge goes. The logic gates use Mach Zehnder Interferometer (MZI) configuration. Simulation of gain and phase dynamics of QDSOA is presented. The present paper investigates output bit patterns using MATLAB. Amplitude Modulation (AM) is calculated and found to be as low as 0.007 dB for unsaturated gain of 10 dB of the QDSOA. A maximum Quality factor 27 dB is calculated for 5mW control power. The paper also investigates the effect of QDSOA length on quality factor. In this paper, I have modified the definitions of AM and Quality Factor (Qfe) to apply in case of frequency encoded logic.

Design and analysis of all optical frequency encoded X-OR and X-NOR gate using quantum dot semiconductor optical amplifier-Mach Zehnder Interferometer

In this paper, the unique features of the reflective semiconductor optical amplifiers (RSOAs) are exploited to numerically simulate the ultrafast performance of an all-optical NOT-AND (NAND) logic ...

120 Gb/s all-optical NAND logic gate using reflective semiconductor optical amplifiers

In this communication, a new semiconductor optical amplifier (SOA)-based module for multi-valued logic units using the cross-polarization modulation effect is proposed and analyzed. The design is simple and compact, consisting of only three SOAs and a few passive optical elements. SOAs have very low switching power (< 1mW), and are very small (< 1 mm) and integrable into modern optical integrated circuits. Being multifunctional, the design is versatile; it can function as a demultiplexer, comparator, half adder, half subtractor, and as basic (OR, AND), universal (NOR, NAND), XOR, and XNOR logic gates. This design follows a tree architecture, operates at very high speed (~ 100Gbit/s), and provides a good Q factor (30 dB or more). The corresponding bit error rate (BER) is very low (~ 10–24). In this work, a relative eye opening as large as 90.4% is calculated. The variations in Q and BER with noise and control power are also investigated.

Design analysis and applications of all-optical multifunctional logic using a semiconductor optical amplifier-based polarization rotation switch

The continuous quest for reversible computation that could be extensively used in applications such as digital signal processing, quantum computing, quantum-dot cellular automata, and nanotechnology has recently discovered its optical implementation as light tenders high-speed computing with the slightest information loss. The electro-optic effect of a lithium-niobate-based Mach-Zehnder interferometer is explored to configure a 4×4 modified Fredkin gate, capable of furnishing as many as 16 logical combinations, and thus showing potential of curbing the area overhead. The optical design is carried out using the beam propagation method. We have also performed the mathematical modeling and analyzed the results in MATLAB.

Optical configuration of modified Fredkin gate using lithium-niobate-based Mach–Zehnder interferometer

All-optical frequency-encoded AND, OR, and NOT logic gates are proposed and their performance simulated to confirm their feasibility. Terahertz optical asymmetric demultiplexer (TOAD)-based logic gates with a control pulse energy as low as 50 fJ are used, and real-time simulations of their input and output pulse patterns reveal a rate of 20 Gbps. Such logic gates could be used for future all-optical logic processors for optical computation and communication systems.

An alternative method for implementation of frequency-encoded logic gates using a terahertz optical asymmetric demultiplexer (TOAD)

Hybrid encoding technique for the representation of the binary states of information, four-wave mixing in semiconductor optical amplifier (SOA) as frequency generator and cross-polarization rotation effect in semiconductor optical amplifier as a frequency converter are used to design all-optical universal logic gate NAND. The devices can perform ultrafast operation and easily integrable. The simulated results of the proposed logic gate ensure feasibility of the proposals.

All-optical logic gate NAND using semiconductor optical amplifiers with simulation

In this paper we have proposed performance of optical logic XOR gate using dual control Tera Hertz Optical Asymmetric Demultiplexer (DCTOAD). For the first time DCTOAD based XOR gate with soliton pulse is proposed and analyzed in terms of eye diagram and quality factor. Extinction Ratio (ER), Contrast Ratio(CR) and relative eye opening are also calculated. High Q factor implies bit error free operation.

Performance analysis of optical logic XOR gate using dual-control Tera Hertz Optical Asymmetric Demultiplexer (DCTOAD)

Semiconductor Optical Amplifier based half adder in dual control configuration in a nonlinear optical loop mirror is proposed in this communication at 100 Gbps rate. The device is analyzed numerically and Extinction Ratio (ER ~ 81 dB), Contrast Ratio (CR ~ 82 dB), Q value (Q ~ 85 dB) are calculated and their dependence on control pulse energy and spontaneous noise factor is studied. Large relative eye opening of the order of 99.52% for SUM and 95.23% for CARRY output respectively ensure practical feasibility of this device. Almost negligible bit error rate and power penalty make this device suitable for all optical communication systems.

Kajal Maji

Papers

An alternative method for implementation of frequency-encoded logic gates using a terahertz optical asymmetric demultiplexer (TOAD)

Numerical simulations of an all-optical parity generator and checker utilizing a reflective semiconductor optical amplifier at 200 Gbps

All-optical logic gate NAND using semiconductor optical amplifiers with simulation

Performance analysis of optical logic XOR gate using dual-control Tera Hertz Optical Asymmetric Demultiplexer (DCTOAD)

Design and analysis of all- optical dual control dual SOA Tera Hertz asymmetric demultiplexer based half adder