Study on optical integrated circuits using quantum dot optical triode

利用三极管演示了负反馈光放大器的噪声抑制特性。光三极管由两个半导体光放大器组成。通过研究负反馈光强与误码率的关系，评价了该系统的噪声抑制特性。从测量结果得到的误码率曲线显示，随着负反馈光强的增加，误码率降低。进一步分析表明，虽然信号增益降低了2.4 dB，但功率损失显著提高了15 dB。这将产生一个输出信号，其增益、波形和基线将自动稳定。由于这些实验发现，它显示了可能的光学放大噪声降低到一个低水平使用光三极管。我们还演示了基于两个负反馈半导体光放大器的全光三极管的全光波长转换和多播特性。

We demonstrated noise suppression characteristics of negative feedback optical amplifier using an optical triode. Optical triode was constituted by two semiconductor optical amplifiers. Noise suppression characteristic was evaluated by investigating the relationship of negative feedback light intensity with bit error rate. The BER curves obtained from measurement results showed reduction in BER as negative feedback light intensity increases. Further analysis revealed that although the signal gain decreases by 2.4 dB, power penalty was improved remarkably by 15 dB. This will result an output signal whose gain, waveform, and baseline, which stabilized automatically. Because of these experimental findings, it was shown possible to reduce optical amplification noise to a low level using optical triode. We also demonstrated an all-optical wavelength conversion and multicasting characteristics based on an all- optical triode using two negative feedback semiconductor optical amplifiers.