Experimental Study Of PbSe Quantum-Dot-Doped Fiber Amplifier Based On Sodium-Aluminum-Borosilicate Silicate Glass

Nanocrystal quantum dots(QDs)have recently attracted much attention due to the unique quantum-confinement effects and optical performance.In near-infrared waveband,there have been studies to show that PbSe QD has the highest quantum yield of IV-VI QDs.In addition,Its particle size is much smaller than its Bohr radius(46 nm),the quantum confinement effect is obvious,and agglomeration is difficult to occur.Therefore,PbSe quantum dots have received more attention.In this dissertation,a PbSe quantum-dot doped fiber amplifier(QDFA)based on the sodium-aluminum-borosilicate-silicate glass in near-infrared(NIR)waveband is realized experimentally for the first time.Through optimizing the melting annealing heattreatment condition,the quantum-dot doped fiber(QDF)with embedded particle size of 4.08-5.88 nm is prepared.The prepared QDF shows strong and steady photoluminescence(PL)emission in NIR region.The realized QDFA is comprised of the QDF,wavelength division multiplexer(WDM),isolator(ISO),and pump laser(LD).In experiment,it is observed that the broadband signal in QDFA is amplified in the region of 1260-1380 nm depending on the size of QDs.The on-off gain is 16.4 dB at the central wavelength and the 3-dB bandwidth reaches 80 nm when the inputting signal power is-17 dBm.An excitation threshold and gain saturation are also observed in the experiment.This glass-based QDFA provides a novel approach to extend the current waveband of erbium-doped fiber amplifiers(EDFAs)and industrial applications in the future.The near-infrared PbSe quantum dot fiber amplifier realized in this paper demonstrates the feasibility of glass-based quantum dot fiber amplifiers for the first time,providing a new way to expand communication bands to S waveband and industrial applications.