All-optical, thermo-optical path length modulation based on the vanadium-doped fibers
Matjašec, Žiga ; Čampelj, Stanislav ; Đonlagić, Denis
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 pumpćs power and the convective heat-transfer coefficient of the surrounding gas, while the time response primarily depends on the heated fiberćs diameter. An absolute optical length change in excess of 500 m 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.
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