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1. 发明申请

US20110199607A1 DETECTING A DISTURBANCE IN THE PHASE OF LIGHT PROPAGATING IN AN OPTICAL WAVEGUIDE 有权
标题翻译：检测在光波导中传播的光照相中的干扰
公开(公告)号：US20110199607A1
公开(公告)日：2011-08-18
申请号：US12312385
申请日：2007-11-08
申请人： Sotiris Emil Kanellopoulos , Sergry Vladimir Shatalin
发明人： Sotiris Emil Kanellopoulos , Sergry Vladimir Shatalin
IPC分类号： G01N21/00
CPC分类号： G01M11/3118
摘要： A partially coherent Optical Time Domain Reflectometry (OTDR) apparatus has a light source comprising a directly modulated semiconductor Distributed FeedBack (DFB) laser diode for transmitting partially coherent light pulses along a monomode optical fibre. Light Rayleigh backscattered from the light pulses as they travel along the optical fibre is output from the end of the fibre into which the light pulses are transmitted to a Fibre Bragg Grating (FBG) filter. The FBG filter reduces the supectral width of light received at a photodetector. In one embodiment, the supectral width of the FBG filter is around one fifth of the supectral width of the light pulse after it has travelled around 1 km along the optical fibre. As a consequence of reducing the supectral width of the light received at the photodetector, the FBG filter increases the temporal coherence of the light. So, the FBG filter can ensure that the detected light is sufficiently coherent that a temporal supeckle pattern can be detected at the photodetector. At the same time, the light traveling in the optical fibre can be relatively supectrally broad so that non-linear effects in the optical fibre, such as Brillouin scattering, can be reduced.
摘要翻译：部分相干光时域反射仪（OTDR）装置具有光源，该光源包括用于沿着单模光纤传输部分相干光脉冲的直接调制的半导体分布反馈反射（DFB）激光二极管。从光脉冲沿光纤行进的背光散射的光瑞利从光脉冲的光纤末端输出到光纤布拉格光栅（FBG）滤光片。 FBG滤光器减少了光电检测器的光接收宽度。在一个实施例中，在沿着光纤行进约1km之后，FBG滤波器的平面宽度大约是光脉冲的周长宽度的五分之一。作为减少在光电检测器处接收的光的超宽度的结果，FBG滤光器增加了光的时间相干性。因此，FBG滤波器可以确保检测到的光足够相干，使得可以在光电检测器处检测到时间超亮纹图案。同时，在光纤中行进的光可以相对地超广泛，从而可以减少光纤中的非线性效应，例如布里渊散射。

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