用二硫化钨（WS2）沉积拉锥光纤实现1550 nm附近的全光移相器和开关
An all optical phase shifter and switch near 1550nm using tungsten disulfide (WS2) deposited tapered fiber
摘要：
光移相器和光开关在光信号处理、传感和通信等各种光学应用中起着重要的作用。在本文中，我们展示了一个光纤全光移相器使用少层二维材料二硫化钨（WS 2）沉积在锥形光纤。WS 2吸收注入的980 nm泵浦光（控制光）并产生热，由于热光效应改变了锥形光纤的折射率，在1550 nm附近实现了6.1π的最大相移。该器件的损耗为3.7 dB。通过构建一个马赫-曾德尔干涉仪与WS 2为基础的移相器在一个臂，全光开关也获得了消光比为15 dB，上升时间为7.3 ms。这种全光纤低成本和紧凑的光移相器和开关演示了二维过渡金属二硫族化合物的潜力，为全光信号处理设备。
英文摘要：
Optical phase shifters and switches play an important role for various optical applications including optical signal processing, sensing and communication. In this paper, we demonstrate a fiber all optical phase shifter using few-layer 2D material tungsten disulfide (WS2) deposited on a tapered fiber. WS2 absorbs injected 980 nm pump (control light) and generates heat which changes the refractive index of the tapered fiber due to thermo-optic effect and achieves a maximum phase shift of 6.1π near 1550 nm. The device has a loss of 3.7 dB. By constructing a Mach-Zehnder interferometer with WS2 based phase shifter in one arm, an all optical switch is also obtained with an extinction ratio of 15 dB and a rise time of 7.3 ms. This all fiber low-cost and compact optical phase shifter and switch demonstrates the potential of 2D transition metal dichalcogenides for all optical signal processing devices.
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