High-Performance Dual-Wavelength All-Optical Reflective Semiconductor Optical Amplifier Utilizing Solution-Processed Quantum Dots

Hamed Ghatei Khiabani Azar ¹ ( Quantum and Photonic Research Lab., Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran )
Samiye Matloub ² ( Quantum and Photonic Research Lab., Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran )
Hamed Baghban ³ ( Quantum and Photonic Research Lab., Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran )

Submited date : 2025-01-25 Accepted date : 2025-04-24

Keywords: Dual-wavelength, Quantum dot reflective semiconductor optical amplifier (QD-RSOA), Optical pumping, Solution-processed quantum dots, All-optical signal processing, Gain recovery.,

Abstract :

This study introduces a novel dual-wavelength all-optical quantum dot reflective semiconductor optical amplifier (QD-RSOA) designed to operate at 1.31 μm and 1.55 μm wavelengths. The device is capable of simultaneous or independent signal amplification, addressing the growing demand for efficient and versatile optical amplifiers in advanced communication systems. The proposed QD-RSOA utilizes solution-processed InAs/AlAs quantum dots and optical pumping to achieve carrier population inversion, leading to several key benefits. These include faster gain recovery, broader gain bandwidth, and improved amplification efficiency when compared to conventional optically pumped quantum dot semiconductor optical amplifiers (QD-SOAs).

The reflective architecture of the device further enhances carrier replenishment, enabling superior modulation depth and wider spectral response. This combination of features makes the QD-RSOA particularly well-suited for applications in wavelength-division multiplexing (WDM) and all-optical signal processing.

Numerical simulations provide strong evidence of its outstanding gain performance, broad spectral coverage, and operational efficiency. These findings underscore the potential of the QD-RSOA for seamless integration into high-speed, multi-channel optical communication networks, marking a significant advancement in optical amplifier technology.

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