Ls Cable Ltd.

Lg Cable Ltd.

Sang-Joon Bae

Young-Il Kwon

Chul-Min Kim

Joon-Keun Lee

Myung-Ho Jang

Dong-Young Kim

Won-Sang Yoo

Young-Gyu Yang

Young-Gyu Yaung

Jong-Pil Kim

Disclosed is an optical fiber coating apparatus for preventing generation of bubble in a coating layer of an optical fiber when the optical fiber is coated, which includes a coating unit for allowing an optical fiber to pass through and forming a coating layer on the optical fiber; a base coupled with a lower portion of the coating unit to draw the optical fiber; a cover installed to an upper portion of the coating unit to isolate the coating unit from an external air and having an optical fiber introduction hole; a gas supply line for supplying gas, having smaller kinetic viscosity than the air, into an inner space formed by the cover; and a coating agent discharge line for discharging a coating agent remained in the inner space of the cover. The inner space forms positive pressure circumstance by using the gas having smaller kinetic viscosity than the air.

Optical fiber coating apparatus for preventing generation of bubble in coating layer of optical fiber and method of coating optical fiber using the same

A furnace for drawing an optical fiber includes a body having an upper and lower openings for supplying a preform and discharging a drawn optical fiber, a heating unit installed in the body for receiving and melting the preform, an atmosphere blocking tube installed to the lower opening for discharging the drawn optical fiber and blocking the optical fiber from the atmosphere, an upper introduction port formed at an upper portion of the body for introducing an inert gas toward the preform and partially discharged outside through a gap between the preform and the upper opening, a central and lower introduction ports formed at central and lower portions for introducing an inert gas into the body, a first flow guiding means for guiding the inert gas introduced through the central introduction port upward and then flowed down along a surface of the preform, and a second flow guiding means for guiding the inert gas introduced through the lower introduction port upward and then discharged outside through the atmosphere blocking tube along a surface of the drawn optical fiber.

Optical fiber drawing furnace with gas flow tubes

A method for monitoring a spin imparted on an optical fiber in order to reduce Polarization Mode Dispersion (PMD) includes the steps of imparting a spin on a high-temperature optical fiber which is drawn from a preform, photographing a dispersion pattern peculiar to the spun optical fiber with a camera from scattered light naturally generated by the spin imparted on the optical fiber, and displaying the photographed dispersion pattern. The method enables monitoring of rate and period of the spin imparted on the optical fiber on the basis of the displayed dispersion pattern.

Method for monitoring spin imparted on optical fiber and method for making optical fiber by using the same

Disclosed is a method for measuring a pitch of a stranded cable which includes the steps of (A) manufacturing a stranded cable by stranding at least two wires; (B) irradiating a parallel ray on one side of the stranded cable moving at a regular velocity, and receiving the parallel ray at the opposed side of the stranded cable; and (C) determining a stranded cycle of the cable on the basis of a light-receiving quantity pattern on the opposed side corresponding to a stranded pattern of the cable, and then measuring a stranded pitch of the cable by calculating a moved distance of the cable during the stranded cycle. This method enables to measure a pitch of a spirally stranded cable in real time at a low cost.

Method and apparatus for measuring a pitch of stranded cable

Growing community of inventors

Gyeonggi-do, South Korea

Sang-Joon Bae