| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a low-loss optical fiber having a long size and a uniform dispersion property. SOLUTION: Eighteen holes 13 are perforated at a prescribed interval in a glass rod 14 by using an ultrasonic drill 9. Three pieces of the glass rods 14 having the perforated holes 13 are prepared, and a preform for a PCF is formed by inserting the three pieces of the glass rods 14a-14c having the perforated holes into a glass pipe 10. In the PCF, a defective part 15 free from the hole is arranged at the central part so as to impart waveguide property. After cleaning the inner faces of the holes 13 with hydrofluoric acid and drying the faces, the glass rod 14 having the perforated holes 13 is heated in an electrical furnace and drawn into an optical fiber having a diameter of 125μm. After drawing the optical fiber, the optical fiber is cut, and the hole diameters d and the intervals A between holes are measured with an electron microscope. The optical fiber having perforated holes analogous to the shape of the holes of the original glass rod having the perforated holes can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI |
