A compact current sensor is demonstrated using a Microfiber Knot Resonator (MKR) which is obtained by knotting silica microfiber fabricated from flame brush technique. With the assistance of a copper wire touching the circumference of the ring, resonant wavelength inside the MKR can be tuned by injecting electric current into the copper wire. The wavelength shift is due to the thermally induced optical phase shifts attributable to the heat produced by the flow of the current. It is shown experimentally that the wavelength shift is linearly proportional to square of the amount of current with a tuning slope of 90 pm/A2. Compared to the previous work that place the copper in the loop of the MKR, this technique is simple, more sensitive and robust.
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机译：使用微纤维结谐振器（MKR）来证明紧凑型电流传感器，该微纤维结谐振器（MKR）是通过通过从火刷技术制造的石英微纤维而获得的。 通过触摸环的圆周的铜线的辅助，可以通过将电流注入铜线来调谐MKR内部的谐振波长。 波长偏移是由于具有由电流流动产生的热量的热诱导的光学相移。 实验示出了波长移位与具有90μm/ a 2 的调谐斜率的电流量的平方线性成比例。 与以前的工作相比，将铜放在MKR的环路中，这种技术简单，更灵敏和强大。
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