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Highly index-sensitive optical devices including long period fiber gratings
Highly index-sensitive optical devices including long period fiber gratings
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机译:高度折射率敏感的光学设备,包括长周期光纤光栅
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摘要
A long period fiber grating (LPG) device is formed to exhibit a “turn-around-point” (TAP) in a phase matching curve when the group velocities of two propagating modes are matched. When the grating period of the LPG is selected to coincide with the TAP, a large tuning bandwidth is formed. This device has been found to be highly sensitive to changes in the refractive index of the ambient surrounding the LPG (recognizing a change in refractive index as low as 10−4), allowing the device to be used as a sensor for trace elements in the atmosphere. The ability of the TAP LPG to modify the intensity of a propagating optical signal as a function of changes in the refractive dielectric of a surround material also allows for this device to be used as an all-fiber high speed optical signal modulator.
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机译:当两个传播模式的群速度匹配时,形成一个长周期光纤光栅(LPG)设备以在相位匹配曲线中表现出“转折点”(TAP)。当LPG的光栅周期选择为重合与TAP时,形成一个大的调谐带宽。已发现该设备对液化石油气周围环境的折射率变化高度敏感(识别出的折射率变化低至10 -4 Sup>),因此该设备可以用作大气中微量元素的传感器。 TAP LPG根据周围材料的折射电介质变化来改变传播的光信号强度的能力也使该器件可用作全光纤高速光信号调制器。
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