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31. 发明授权

US06324319B1 Spliced optical fiber coupler 有权
标题翻译：拼接光纤耦合器
公开(公告)号：US06324319B1
公开(公告)日：2001-11-27
申请号：US09357782
申请日：1999-07-21
申请人： Alexander Tselikov , Ronald E. Gerber , Edward C. Gage , Gregory S. Mowry
发明人： Alexander Tselikov , Ronald E. Gerber , Edward C. Gage , Gregory S. Mowry
IPC分类号： G02B600
CPC分类号： G11B7/1356 , G02B6/2551 , G02B6/262 , G02B6/4207 , G02B6/4216 , G11B7/1384 , G11B7/1398 , G11B11/10541
摘要： In general, the mode field pattern of a single-mode polarization-maintaining fiber is symmetric. There are preferred axes for the polarization states, but the intensity pattern emerging from the fiber is rotationally symmetric. If a short piece of multi-mode fiber is spliced onto the end of a polarization-maintaining single-mode fiber, it is possible to change the apparent shape of the mode field. The use of a fusion splicer affects the stress pattern in polarization-preserving fiber, and introduces asymmetry into the shape of the fiber mode field. If the spliced fiber is cleaved near the splice, and the asymmetry of the fiber mode field is matched to the asymmetry of a laser diode beam, then the laser beam is coupled efficiently into the fiber without the use of additional beam-shaping optics. The asymmetric beam from the laser is brought to a focus, which is also asymmetric. By matching the asymmetries of the focused spot and the distorted mode field (caused by the addition of the short piece of multi-mode fiber), good coupling is achieved into the fiber. Once the light has entered the spliced fiber and propagated past the splice, the mode field returns to its original symmetric pattern and the light propagates in a single mode, as it would in an unspoiled, single-mode polarization-maintaining fiber. The output from the unspoiled end is still symmetric, and there is little attenuation caused by the splice.
摘要翻译：通常，单模维持光纤的模场模式是对称的。存在用于偏振态的优选轴，但是从光纤出射的强度图案是旋转对称的。如果短路多模光纤被拼接到偏振保持单模光纤的端部，则可以改变模场的表观形状。使用熔接器影响偏振保持光纤中的应力模式，并将不对称性引入光纤模式场的形状。如果拼接光纤在接头附近被切割，并且光纤模式场的不对称性与激光二极管光束的不对称性匹配，则激光束有效地耦合到光纤中，而不需要额外的光束整形光学器件。使来自激光器的不对称光束成为焦点，其也是不对称的。通过匹配聚焦点的不对称性和失真模场（由添加短模的多模光纤引起），纤维实现良好的耦合。一旦光已经进入拼接的光纤并传播通过接头，则模式场将返回其原始的对称图案，并且光以单模式传播，如同在未受污染的单模偏振保持光纤中。未破坏端的输出仍然是对称的，并且由接头引起的衰减很小。

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