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首页> 外文期刊>Applied optics >OPTICAL FIBER MONITORED BY A DIRECTIONAL COUPLER FOR DELIVERING LASER RADIATION IN MEDICAL TREATMENTS
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OPTICAL FIBER MONITORED BY A DIRECTIONAL COUPLER FOR DELIVERING LASER RADIATION IN MEDICAL TREATMENTS

机译：定向耦合器监测的光纤用于在医疗治疗中提供激光辐射

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The safety of therapeutic laser treatments could be strongly improved by introducing real-time monitoring to the fiber delivery system. Since any fiber damage leads to a significant variation of the backscatter, its detection could be exploited to monitor the system, in particular the fiber trip. To assess this potential, the backscattered modal power distribution (BMPD) from flat, bulb, and damaged fiber tips were investigated. The BMPD detection was accomplished by using a conventional beam-splitter method and two directional couplers: a prism-fiber and a fiber-fiber lapped coupler. Unlike the conventional method, use of the couplers allows for the separate detection of backscattered and forward transmitted signals. Therefore variations in the backscatter that are due to only a change in the laser pulse can be determined. Moreover, the directional couplers, because of the amplification of high-index modes, allow for an increase in sensitivity of the method. This was particularly evident in our tests on fiber tips that had been dipped into water to obtain a better simulation of the real working conditions. Finally, the influence of the target on the BMPD was investigated as a function of its distance from the fiber tip. All the tests confirm that the target must be taken into account if the distance is < 1 mm, but the monitoring system can also be used when the fiber tip works in contact with the tissue wall provided that one can ensure contact by pushing the tip against the target wall. [References: 8]
机译：通过将实时监控引入光纤传输系统，可以大大提高治疗性激光治疗的安全性。由于任何光纤损坏都会导致反向散射的显着变化，因此可以利用其检测来监视系统，尤其是光纤行程。为了评估这种潜力，研究了扁平，灯泡和损坏的光纤尖端的反向散射模态功率分布（BMPD）。 BMPD检测是通过使用常规的分束器方法和两个定向耦合器完成的：棱镜光纤和光纤重叠的耦合器。与常规方法不同，使用耦合器可以分别检测反向散射和正向传输的信号。因此，可以确定仅由激光脉冲的变化引起的反向散射的变化。此外，定向耦合器由于高折射率模式的放大而使得该方法的灵敏度提高。在我们对浸入水中以更好地模拟实际工作条件的纤维尖端进行的测试中，这一点尤其明显。最后，研究了靶材对BMPD的影响，它是其距纤维尖端距离的函数。所有测试均确认，如果距离小于1毫米，则必须考虑到目标，但是当光纤尖端与组织壁接触时，也可以使用监控系统，前提是可以通过将尖端推向上方来确保接触目标墙。 [参考：8]

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