Low noise optical multi-carrier generation using optical-FIR filter for ASE noise suppression in re-circulating frequency shifter loop.
Low noise optical multi-carrier generation using optical-FIR filter for ASE noise suppression in re-circulating frequency shifter loop.
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DOI：
10.1364/oe.22.007852
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发表时间：
2014-04
期刊：
影响因子：
3.8
通讯作者：
Jiachuan Lin;Lixia Xi;Jian-rui Li;Xiaoguang Zhang;Xia Zhang;S. Niazi
中科院分区：
文献类型：
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作者：
Jiachuan Lin;Lixia Xi;Jian-rui Li;Xiaoguang Zhang;Xia Zhang;S. Niazi
本文提出了一种基于单边带循环移频器和光学有限脉冲响应（FIR）滤波器的多载波产生方案，用于抑制放大自发辐射（ASE）噪声。引入载噪比（CNR）代替音噪比（TNR），更合理、更准确地评估具有非平坦噪声基底的多载波信源的信噪比。实验结果表明，对于产生的50和69个平坦低噪声载波，最坏情况下的CNR分别为22.5dB和19.1dB，这比以前引用的基于循环移频器的工作有明显的改善。
In this paper, an improved multi-carrier generation scheme based on single-side-band recirculating frequency shifter with optical finite impulse response (FIR) filter for amplified spontaneous emission (ASE) noise suppression is proposed and experimentally demonstrated. The carrier-to-noise-ratio (CNR) instead of tone-to-noise-ratio (TNR) is introduced to more reasonably and exactly evaluate the signal-to-noise-ratio of a multi-carrier source with non-flat noise floor. We have experimentally attain the worst case CNR of 22.5dB and 19.1dB for generated 50 and 69 flat low noise carriers, which has shown significant improvement than the previous cited works based on recirculating frequency shifter.