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Modeling a Single Doped Quantum Dot Fiber Amplifier

A new kind of dopant-semiconductor nanocrystal (quantum dot) doped into a fiber forming a quantum-dot-doped fiber and thereby configuring a quantum-dot-doped fiber amplifier (QDFA) is presented. The bandwidth, gain and noise of the QDFA is simulated by choosing a kind of PbSe quantum dot with 5.5-nm diameter and solving rate equations in a two-level system. The PbSe-QDFA is obviously advantageous in respects of the bandwidth and noise compared with usual erbium-doped fiber amplifiers available.