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首页> 外文期刊>Applied optics >Switchable and tunable multiple-channel erbium-doped fiber laser using graphene-polymer nanocomposite and asymmetric two-stage fiber Sagnac loop filter
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Switchable and tunable multiple-channel erbium-doped fiber laser using graphene-polymer nanocomposite and asymmetric two-stage fiber Sagnac loop filter

机译：使用石墨烯-聚合物纳米复合材料和不对称两级光纤Sagnac环路滤波器的可切换和可调多通道掺-光纤激光器

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摘要

A high-performance multiple-channel erbium-doped fiber laser (EDFL) is proposed and experimentally demonstrated, using graphene-polymer nanocomposite as a multiwavelength equalizer and an asymmetric two-stage polarization-maintaining fiber (PMF) Sagnac loop as a flexible comb filter. At first, the filtering characteristics of the PMF Sagnac loop filter (SLF) are investigated. Both theoretical and experimental results show that it can provide a flexibly switchable and tunable comblike filtering. Then, the two-stage PMF SLF is inserted into a graphene-assisted EDFL cavity for generating multi-wavelength oscillation. The extreme-high third-order optical nonlinearity of graphene is exploited to suppress the mode competition of the EDFL, and a stable multiple-channel lasing is observed. By carefully adjusting the polarization controllers in the two-stage PMF SLF, not only can the lasing-line number per channel be switchable between single and multiple wavelengths, but also the wavelength spacing in the triple-wavelength condition can be tunable. In the case of triple wavelengths per channel, up to 12 wavelengths with four channels stable oscillations can be achieved. The multiple-channel EDFL can keep a high extinction ratio of >40 dB and a narrow linewidth of <0.01 nm.
机译：提出并通过实验证明了高性能多通道掺-光纤激光器（EDFL），它使用石墨烯-聚合物纳米复合材料作为多波长均衡器，并使用非对称两级保偏光纤（PMF）Sagnac环作为柔性梳状滤波器。首先，研究了PMF Sagnac环路滤波器（SLF）的滤波特性。理论和实验结果均表明，它可以提供灵活的可切换和可调梳状滤波。然后，将两级PMF SLF插入石墨烯辅助的EDFL腔中，以产生多波长振荡。利用石墨烯的极高三阶光学非线性来抑制EDFL的模式竞争，并观察到稳定的多通道激光。通过仔细调节两级PMF SLF中的偏振控制器，不仅可以在单个波长和多个波长之间切换每个通道的激射线数，而且可以调节三波长条件下的波长间隔。在每通道三波长的情况下，最多可在四个通道中获得12个波长的稳定振荡。多通道EDFL可以保持大于40 dB的高消光比和小于0.01 nm的窄线宽。

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