Optical fiber manufacturing method and optical fiber manufacturing apparatus
AssigneeFujikura Ltd.
InventorTomoyasu Honda
Life of this patent
Estimating the term…
Abstract
An optical fiber manufacturing method includes supplying power to a drawing furnace to cause T/V to decrease to Ttarget/Vtarget along a quadratic function having a value of the Ttarget/Vtarget at an apex with lapse of time, where T is a tension applied to an optical fiber when an optical fiber preform is heated by the drawing furnace and the optical fiber is drawn, V is speed of withdrawing the optical fiber when the optical fiber is heated by the drawing furnace and the optical fiber is drawn, Ttarget is a target value of the tension, and Vtarget is a target value of the speed.
Claims7
An optical fiber manufacturing method comprising:
- heating an optical fiber preform by a drawing furnace;
- drawing an optical fiber;
- and
- supplying power to the drawing furnace to cause T/V to decrease to Ttarget/Vtarget along a quadratic function having a value of the Ttarget/Vtarget at an apex with lapse of time, where
- T is a tension applied to the optical fiber when the optical fiber preform is heated by the drawing furnace and the optical fiber is drawn,
- V is speed of withdrawing the optical fiber when the optical fiber is heated by the drawing furnace and the optical fiber is drawn,
- Ttarget is a target value of the tension, and
- Vtarget is a target value of the speed.
An optical fiber manufacturing apparatus comprising:
- a drawing furnace that heats an optical fiber preform and draws an optical fiber;
- a power supplier that supplies power to the drawing furnace;
- and
- a controller that controls the power supplier to cause T/V to decrease to Ttarget/Vtarget along a quadratic function having a value of the Ttarget/Vtarget at an apex with lapse of time, where
- T is a tension applied to the optical fiber when the optical fiber preform is heated by the drawing furnace and the optical fiber is drawn,
- V is speed of withdrawing the optical fiber when the optical fiber is heated by the drawing furnace and the optical fiber is drawn,
- Ttarget is a target value of the tension, and
- Vtarget is a target value of the speed.
Dependencies are inferred from the claim text.