Matjasec Ziga, Campelj Stanislav, Donlagic Denis
University of Maribor, Faculty of Electrical Engineering and Computer Science, Laboratory for electro-optics and sensor systems, Smetanova 17, 2000 Maribor, Slovenia.
Opt Express. 2013 May 20;21(10):11794-807. doi: 10.1364/OE.21.011794.
This paper presents an all-fiber, fully-optically controlled, optical-path length modulator based on highly absorbing optical fiber. The modulator utilizes a high-power 980 nm pump diode and a short section of vanadium-co-doped single mode fiber that is heated through absorption and a non-radiative relaxation process. The achievable path length modulation range primarily depends on the pump's power and the convective heat-transfer coefficient of the surrounding gas, while the time response primarily depends on the heated fiber's diameter. An absolute optical length change in excess of 500 µm and a time-constant as short as 11 ms, were demonstrated experimentally. The all-fiber design allows for an electrically-passive and remote operation of the modulator. The presented modulator could find use within various fiber-optics systems that require optical (remote) path length control or modulation.
本文介绍了一种基于高吸收光纤的全光纤、全光控光程长度调制器。该调制器利用高功率980nm泵浦二极管和一小段通过吸收和非辐射弛豫过程加热的钒共掺杂单模光纤。可实现的光程长度调制范围主要取决于泵浦功率和周围气体的对流换热系数，而时间响应主要取决于加热光纤的直径。实验证明了绝对光程变化超过500μm，时间常数短至11ms。全光纤设计允许调制器进行电无源和远程操作。所提出的调制器可用于各种需要光（远程）光程长度控制或调制的光纤系统中。
