Recently, the integration of two-dimensional materials with optical fibers has opened up a great opportunity to develop all-fiber signal-processing devices. Graphene is an ideal material for all-optical signal processing via thermal-optic effect because of its high electrical and thermal conductivity, as well as broadband light-matter interactions with fast responses. Herein, we report the achievement of all-optical switching with fast response by integrating few-layer graphene onto a tilted fiber Bragg grating (TFBG) inscribed in a reduced-diameter fiber. Relying on graphene's decent photothermal effect, the transmission spectrum of the TFBG could be all-optically modulated by tuning the incident pump power. The all-optical switch can consequently operate at a series of wavelengths owing to the TFBG's comb-like resonances. The reduced diameter of the graphene-integrated TFBG and the pump at its resonant wavelength promise the all-optical switch to have a fast-dynamic response of around 1 μs and an extinction ratio exceeding 13 dB. This compact device with graphene integration has the potentials to be integrated into all-fiber system to extend the functions of all-optical signal processing.

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用于全光交换的几层石墨烯集成式倾斜光纤光栅

近来，二维材料与光纤的集成为开发全光纤信号处理设备开辟了巨大的机会。石墨烯是一种通过热光效应进行全光信号处理的理想材料，因为它具有很高的电导率和导热率，以及宽带光物质相互作用且响应速度快。本文中，我们报告了通过将几层石墨​​烯集成到直径减小的光纤中刻入的倾斜光纤布拉格光栅（TFBG）上，实现具有快速响应的全光切换的效果。依靠石墨烯的良好光热效应，可以通过调节入射泵浦功率来全光调制TFBG的透射光谱。因此，由于TFBG的梳状共振，全光开关可以在一系列波长下工作。石墨烯集成的TFBG的直径减小，并且泵浦在其共振波长处，保证了全光开关具有约1μs的快速动态响应和超过13 dB的消光比。这种具有石墨烯集成的紧凑型器件具有被集成到全光纤系统中的潜力，以扩展全光信号处理的功能。