Nonlinear fiber system for shot-noise limited intensity noise suppression and amplification.
Nonlinear fiber system for shot-noise limited intensity noise suppression and amplification.
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DOI：
10.1364/ol.431861
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发表时间：
2021-05
期刊：
影响因子：
3.6
通讯作者：
Marvin Edelmann;Y. Hua;K. Şafak;F. Kärtner
中科院分区：
文献类型：
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作者：
Marvin Edelmann;Y. Hua;K. Şafak;F. Kärtner
我们提出了一种非线性光纤系统，用于限制短噪声、全光强度降噪和信号放大。其机理是基于保偏光纤放大器中正交偏振模式之间不同非线性相移的积累，并结合实现的正弦传输函数。由此产生的输入强度波动与系统传输之间的相关性使输入脉冲序列的强度噪声降低成为可调的。在实验中，锁模振荡器的噪声谱密度被抑制了20 dB，达到测量的理论短噪声极限-151.1dBc/Hz，同时脉冲放大13.5 dB。
We propose a nonlinear fiber system for shot-noise limited, all-optical intensity noise reduction and signal amplification. The mechanism is based on the accumulation of different nonlinear phase shifts between orthogonal polarization modes in a polarization-maintaining fiber amplifier in combination with an implemented sinusoidal transmission function. The resulting correlation between the input intensity fluctuations and the system transmission enables tunable intensity noise reduction of the input pulse train. In the experiment, the noise spectral density of a mode-locked oscillator is suppressed by up to 20 dB to the theoretical shot-noise limit of the measurement at -151.1dBc/Hz with simultaneous pulse amplification of 13.5 dB.