Quantum dot amplifiers.

曾凤 Zeng Feng, 张振娟 Zhang Zhenjuan

Takashi Kita, P. Jayavel, Hirokazu Tanaka +8 more

Polarization insensitivity of InAs/GaAs quantum dot optical amplifier has been demonstrated by controlling dot shape. This polarization insensitivity covers a bandwidth in excess of 40 nm.

Vitaliy V. Shtykov, Sergey M. Smolskiy

Paola Borri, Stephan Schneider, W. Langbein +7 more

The ultrafast gain dynamics measured with femtosecond resolution in InAs-based quantum dot amplifiers are presented. An ultrafast gain recovery of the dot ground-state transition under electrical injection is measured, promising for high-speed applications.

Cheng Cheng, Zhang Hang, 浙江工业大学应用物理系，杭州 310023

A novel kind of fiber amplifier——quantum dot doped fiber amplifier (QDFA) is presented. Using semiconductor nanocrystal PbSe as a dopant, the gain bandwidths of the PbSe-QDFA are simulated by solving the rate equation and the light propagation equation in a two-level system, applying a genetic algorithm combined with an “inversing method”. Comparing with conventional erbium-doped fiber amplifiers available, there is evidence to show that characteristics of the PbSe-QDFA are obviously advantageous in respect of bandwidth and noise, especially on long-waelength band. Furthermore, the ideal emission-absorption cross-sections of the quantum dot are determined by utilizing the genetic algorithm. Under such ideal cross-sections, the QDFA possesses with the performance of ultra-bandwidth and low noise figure near a quantum limit.