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61.发明授权Optical fiber preform manufacturing method for shrinkage and closing of deposited tube 失效用于收缩和沉积管的光纤预制棒的制造方法公开(公告)号：US06840063B2
公开(公告)日：2005-01-11
申请号：US10059342
申请日：2002-01-31
申请人： Sung-Koog Oh , Man-Seok Seo , Jin-Seong Yang , Mun-Hyun Do
发明人： Sung-Koog Oh , Man-Seok Seo , Jin-Seong Yang , Mun-Hyun Do
IPC分类号： C03B37/027 , C03B37/012 , C03B37/018 , G02B6/00
CPC分类号： C03B37/01248 , C03B37/01257 , C03B37/01853 , C03B37/01869
摘要： An optical fiber preform manufacturing method whereby a clad layer and core layer are deposited on the inner surface of a preform tube for forming a deposited tube. One end of the deposited tube is shrunk and closed. The deposited tube which has a closed end is arranged extending vertically through a circular heater. A heat is applied to the deposited tube at a temperature lower than the softening point of a deposited tube, exhausting contaminants existing in the interior of the deposited tube while moving the circular heater. The heating temperature of the circular heater is then set to a temperature not lower than the softening point of the deposited tube-to shrink and close the deposited tube.
摘要翻译： 一种光纤预制棒的制造方法，其中包覆层和芯层沉积在用于形成沉积管的预成型管的内表面上。 沉积管的一端收缩并闭合。 具有封闭端的沉积管布置成垂直延伸通过圆形加热器。 在低于沉积管的软化点的温度下对沉积的管施加热量，在移动圆形加热器的同时排出存在于沉积管内部的污染物。 然后将圆形加热器的加热温度设定为不低于沉积管的软化点的温度 - 收缩并封闭沉积的管。
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公开(公告)号：US6133964A
公开(公告)日：2000-10-17
申请号：US873718
申请日：1997-06-12
申请人： Dong-seok Han
发明人： Dong-seok Han
摘要： A digital demodulator which removes frequency and phase errors existing in a digital signal and converting the error-removed digital signal into a base band signal. The digital demodulator uses a frequency that is twice the transmission rate as the frequency of the sampling clock signal of an analog-to-digital (A/D) converter, and demodulates a received signal in a digital processing using the A/D converter which is low-speed. Thus, all of the received signal processing becomes digitized.
摘要翻译： 数字解调器，其去除存在于数字信号中的频率和相位误差，并将去除错误的数字信号转换为基带信号。 数字解调器使用传输速率的两倍于模数（A / D）转换器的采样时钟信号的频率，并使用A / D转换器在数字处理中对接收信号进行解调， 是低速的 因此，所有接收到的信号处理变得数字化。
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