Nonlinear All Optical Digital Amplification of the Light Pulse in Weakly Coupled Photonic Crystal Waveguides

TL;DR

This paper proposes a method for all-optical digital amplification using weakly coupled nonlinear photonic crystal waveguides, demonstrating effective soliton-based signal amplification at specific frequencies.

Contribution

It introduces a novel approach to optical amplification leveraging nonlinear photonic crystal waveguides and analyzes soliton formation for signal enhancement.

Findings

Effective amplification demonstrated at specific frequencies.

Soliton formation enables all-optical digital amplification.

Detailed near-field and power distribution analysis provided.

Abstract

All-optical amplification of the light pulse in a weakly coupled two nonlinear photonic crystal waveguides (PCWs) is proposed. We consider pillar-type PCWs, which consist of the periodically distributed circular rods made from a Kerr-type dielectric material. Dispersion diagrams of the symmetric and antisymmetric modes are calculated. The operating frequency is properly chosen to be located at the edge of the dispersion diagram of the modes. In the linear case no propagation modes are excited at this frequency, however, in case of nonlinear medium when the amplitude of the injected signal is above some threshold value, the solitons are formed and they are propagating inside the coupled nonlinear PCWs. Near field distributions of the light pulse propagation inside the coupled nonlinear PCWs and the output powers of the registered signals are studied in a detail. The amplification coefficient is calculated at the various amplitudes of the launched signal. The results vividly demonstrate the effectiveness of the weakly coupled nonlinear PCWs as all-optical digital amplifier.