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1. 发明公开

EP1030823A4 DRAW CONSTANT DOWNFEED PROCESS 审中-公开
标题翻译： KONSTANTES UNTERZIEHVERFAHREN
公开(公告)号：EP1030823A4
公开(公告)日：2000-12-27
申请号：EP98946905
申请日：1998-09-10
申请人： CORNING INC
发明人： ALLEN MARTIN W , HASKINS LORI L , RUGER LISA M
IPC分类号： G02B6/00 , C03B37/025 , C03B37/027 , C03B37/07
CPC分类号： C03B37/0253 , C03B2205/06 , C03B2205/40 , C03B2205/42 , C03B2205/44 , C03B2205/72
摘要： Optical fiber (14) is drawn from a preform (10) that is fed to a furnace at a constant downfeed rate. The optical fiber (14) is drawn by a tractor (20) at a rate of at least 10 meters per second and the tractor (20) is allowed to vary the draw speed of the fiber (14) based on the fiber diameter as measured by a diameter monitor (15) during the draw processing in order to maintain a relatively constant fiber diameter. Maintaining the preform downfeed rate constant even at high draw rates in excess of 20 meters per second does not adversely effect the draw process and is believed to reduce or eliminate oscillations in the draw control loop that can cause variations in the core shape during fiber formation, resulting in reduced PMD and improved MFD uniformity.
摘要翻译：光纤（14）从以恒定的降速进给到炉的预成型件（10）中拉出。光纤（14）由拖拉机（20）以至少10米/秒的速率拉伸，并且允许拖拉机（20）根据所测量的纤维直径来改变纤维（14）的拉伸速度通过直径监视器（15）在拉伸处理期间以保持相对恒定的纤维直径。即使在超过20米/秒的高拉伸速率下仍保持预成型坯向下进给速率恒定不会对牵引过程产生不利影响，并且被认为可减少或消除牵引控制回路中的振荡，其可能导致纤维形成期间的芯形变化，导致PMD降低和MFD均匀性得到改善。

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