Linear Amplification of Optical Signal in Coupled Photonic Crystal Waveguides

TL;DR

This paper proposes a novel all-optical amplifier using a symmetric coupled photonic crystal waveguide, leveraging mode control to achieve amplification of signals and pulses.

Contribution

It introduces a new design for all-optical amplification based on mode selection in coupled photonic crystal waveguides, demonstrating effective signal enhancement.

Findings

Amplification coefficient calculated for continuous signals.

Effective mode control enables all-optical amplification.

Design achieves selective mode propagation for amplification.

Abstract

We introduce a weakly coupled photonic crystal waveguide as a promising and realistic model for all-optical amplification. A symmetric pillar type coupled photonic crystal waveguide consisting of dielectric rods periodically distributed in a free space is proposed as all-optical amplifier. Using the unique features of the photonic crystals to control and guide the light, we have properly chosen the frequency at which only one mode (odd mode) becomes the propagating mode in the coupled photonic crystal waveguide, whereas another mode (even mode) is completely reflected from the guiding structure. Under this condition, the all-optical amplification is fully realized. The amplification coefficient for the continuous signal and the Gaussian pulse is calculated.