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    • 1. 发明申请
    • Method and apparatus for fabricating optical fiber preform using double torch in mcvd
    • 在mcvd中使用双炬制造光纤预制棒的方法和装置
    • US20050000252A1
    • 2005-01-06
    • US10497093
    • 2003-02-26
    • Chan-Joo LeeSoo-Il SonJi-Sang Park
    • Chan-Joo LeeSoo-Il SonJi-Sang Park
    • C03B37/018
    • C03B37/01853C03B37/01815C03B2201/04C03B2201/075Y02P40/57
    • Disclosed is a method for fabricating an optical fiber preform using a double torch in MCVD, which includes a first process of heating a quartz tube (10) at a temperature lower than a sintering temperature by using a first torch (21) with putting reaction gas, oxygen gas and dehydration gas into the tube so that soot particles are generated and deposited, and heating the tube to a predetermined temperature by using a second torch (22) spaced apart from the first torch after the first torch (21) passes so that moisture in the soot particles is removed; and a second process of conducting dehydration for removing moisture in the soot particles by use of the first torch (21) again, and heating the tube above a sintering temperature by using the second torch (22) so that the soot particles free from moisture are vitrified.
    • 公开了一种使用MCVD中的双炬制造光纤预制件的方法,该方法包括通过使用第一炬(21)将石英管(10)加热至低于烧结温度的第一工序, ,氧气和脱水气体进入管中,从而产生并沉积烟灰颗粒,并且通过在第一焊炬(21)通过之后使用与第一炬间隔开的第二炬(22)将管加热到预定温度,使得 除去烟灰颗粒中的水分; 以及再次通过使用第一炬(21)进行脱水以除去烟灰颗粒中的水分的第二过程,并且通过使用第二炬(22)将管加热到高于烧结温度,使得没有水分的烟灰颗粒是 玻璃化
    • 9. 发明授权
    • Method for manufacturing single mode optical fiber having low polarization mode dispersion
    • 具有低偏振模色散的单模光纤的制造方法
    • US07529452B2
    • 2009-05-05
    • US11838454
    • 2007-08-14
    • Ji-Sang ParkSoon-Il SohnLae-Hyuk Park
    • Ji-Sang ParkSoon-Il SohnLae-Hyuk Park
    • G02B6/02
    • C03B37/02745C03B2203/20C03B2203/36C03B2205/06
    • A method for manufacturing a single mode optical fiber with a reduced PMD (Polarization Mode Dispersion), by drawing an optical fiber preform composed of a core and a clad surrounding the core, includes (a) heating the optical fiber preform to a high temperature using a furnace, and drawing an optical fiber from an outlet of the furnace at a linear velocity (Vf) of 500 mpm or above by means of neck-down drawing; and (b) impressing a spin on the optical fiber by means of a spin impressing device provided on a drawing path of the optical fiber, wherein a maximum spatial frequency of spin (y) impressed on the optical fiber satisfies the following equations Exp ⁡ ( 24 ⁢ t - 12 ) ≤ y ≤ - 20 × log ( V f 500 ) + 25 and t=(0.21×CladOval)+(0.04×CoreOval)+(0.17×ECC), where y is a maximum spatial frequency of spin [turns/m], Vf is a drawing velocity [mpm], CladOval is a clad ovality [%], CoreOval is a core ovality [%], and ECC is an eccentricity [μm].
    • 制造具有降低的PMD(极化模式色散)的单模光纤的方法,通过绘制由芯和围绕芯的包层构成的光纤预制件,包括:(a)使用 炉,并通过颈缩拉丝以500mpm以上的线速度(Vf)从炉的出口拉出光纤; 和(b)通过设置在光纤的绘制路径上的自旋施加装置在光纤上施加自旋,其中施加在光纤上的最大旋转空间频率(y)满足以下等式 Exp 24 t - 12 <= y <= - 20 x log mo>( V f 500 / mo> + 25 和t =(0.21xCladOval) +(0.04xCoreOval)+(0.17xECC),其中y是旋转的最大空间频率[匝/ m],Vf是绘制速度[mpm],CladOval是包层椭圆度[%],CoreOval是核心椭圆度[ %],ECC是一个偏心[妈妈]。