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Suppression of Modal Noise in a Multimode Fiber-Optic Delivery Output from an Ultra-Broadband Supercontinuum Light Source

机译：抑制超宽带超连续谱光源在多模光纤输出中的模态噪声

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摘要

We have tested various methods to suppress the modal noise in multi-mode fiber (MMF) output from an ultra-broadband supercontinuum light which is generated in a nonlinear photonic-crystal fiber (PCF) pumped with a 1,06-μm-wavelength, sub-nanosecond-pulse-width, 8-kHz-rep-rate Nd.YAG laser source. Significant amount of modal noise including spectral fluctuations was observed when the output from the photonic crystal single-mode fiber (SMF) was directly coupled into MMF. Standard mode-exciting and -mixing techniques such as mode scrambling and fiber stretching showed minimal effect on noise suppression. We observed significant suppression of modal noise by expanding the output beam from the PCF and tightly focus back into MMF using multiple lenses. The resulting spectra of the different MMFs are compared with the output from different SMFs coupled to the supercontinuum source, which are necessary to cover the broadband range of the supercontinuum source over more than two octaves, from 450 nm up to 2100 nm wavelength.
机译：我们已经测试了多种方法来抑制超宽带超连续谱光输出的多模光纤（MMF）中的模态噪声，该超模超连续光在以1,06μm波长泵浦的非线性光子晶体光纤（PCF）中产生，亚纳秒脉冲宽度，8 kHz重复频率Nd.YAG激光源。当光子晶体单模光纤（SMF）的输出直接耦合到MMF时，观察到大量的模态噪声，包括频谱波动。标准的模式激励和混合技术（例如模式加扰和光纤拉伸）对噪声抑制的影响最小。我们观察到通过扩展PCF的输出光束并使用多个透镜将焦点紧紧聚焦回MMF中，从而显着抑制了模态噪声。将不同MMF的最终光谱与耦合到超连续谱源的不同SMF的输出进行比较，这对于覆盖超过450个2100 nm波长的两个以上倍频程的超连续谱源的宽带范围是必需的。

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