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    • 1. 发明公开
    • OPTICAL FIBER PARENT MATERIAL AND METHOD FOR MANUFACTURING OPTICAL FIBER
    • 光纤母材和制造光纤的方法
    • EP3243803A1
    • 2017-11-15
    • EP16735094.1
    • 2016-01-08
    • Furukawa Electric Co. Ltd.
    • KAWASAKI, Mitsuhiro
    • C03B37/012C03C19/00G02B6/02
    • C03B37/012C03B37/01251C03B37/0253C03B37/02772C03B2205/40C03B2205/44C03B2205/45C03B2205/47C03B2205/72G02B6/02
    • An optical fiber preform includes: a columnar portion having an approximately constant radius of r; and a taper portion located adjacent to the columnar portion in a lengthwise direction and having a radius decreasing along the lengthwise direction. The taper portion includes: a first taper portion including a portion having a radius varying between 0.9r and 0.6r; and a second taper portion including a portion having a radius varying between 0.4r and 0.15r. A diameter of the first taper portion in the portion having the radius varying between 0.9r and 0.6r decreases so as to form a maximum angle θ1 between 40 degrees and 60 degrees with respect to the columnar portion, a diameter of the second taper portion in the portion having the radius varying between 0.4r and 0.15r decreases so as to form an average angle θ2 between 5 degrees and 30 degrees with respect to a central axis in the lengthwise direction, and a volume of the taper portion is smaller than or equal to 45% of a volume of a column having a same outer diameter as a maximum outer diameter of the taper portion and having a same length as the taper portion.
    • 一种光纤预制棒包括:具有近似不变的半径r的柱状部分; 以及在长度方向上与所述柱状部分相邻并且具有沿所述长度方向减小的半径的锥形部分。 锥形部分包括:第一锥形部分,其包括半径在0.9r和0.6r之间变化的部分; 以及包括半径在0.4r和0.15r之间变化的部分的第二锥形部分。 半径在0.9r和0.6r之间变化的部分中的第一锥形部分的直径减小,从而相对于柱形部分形成40度和60度之间的最大角度θ1,第二锥形部分的直径 半径在0.4r和0.15r之间变化的部分减小,从而相对于中心轴在长度方向上形成5度和30度之间的平均角度θ2,并且锥形部分的体积小于或等于 相同外径的锥体部分的最大外径的圆柱体积的45%,并具有与锥体部分相同的长度。
    • 6. 发明公开
    • DRAW CONSTANT DOWNFEED PROCESS
    • KONSTANTES UNTERZIEHVERFAHREN
    • EP1030823A4
    • 2000-12-27
    • EP98946905
    • 1998-09-10
    • CORNING INC
    • ALLEN MARTIN WHASKINS LORI LRUGER LISA M
    • G02B6/00C03B37/025C03B37/027C03B37/07
    • C03B37/0253C03B2205/06C03B2205/40C03B2205/42C03B2205/44C03B2205/72
    • 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.
    • 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。