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1引言随着信息处理和传送需求的增长，光纤应用于高速信息传输日益增多．而在长距离传输系统中，单模玻璃光纤是最合适的传输媒质，这是由于它具有高带宽和高透明的特性。另一方面，同玻璃光纤相比，聚合物光纤（POF）具有芯径大、柔软性好、易于生产、处理且价格低等优点．近
1 Introduction With the increasing demand for information processing and transmission, the application of optical fiber to high-speed data transmission is increasing day by day. In the long-distance transmission system, single-mode glass fiber is the most suitable transmission medium, which is due to its high bandwidth and high transparency. On the other hand, polymer optical fiber (POF) has the advantages of large core diameter, good flexibility, easy production, processing and low price compared with glass optical fiber. near