Method for manufacturing optical fiber

A method for manufacturing an optical fiber by coating a first resin on a glass fiber drawn from a glass base material, and curing the first resin to form a first coating, the method comprising:

• causing the glass fiber to travel at a first velocity during a first time period;
• increasing the velocity of the glass fiber from the first velocity to a second velocity during a second time period following the first time period;
• and
• maintaining the velocity of the glass fiber at the second velocity during a third time period following the second time period, wherein
• TB2/TB1 is greater than 1.0 and less than or equal to 11.0, where TB1 denotes a thickness of the first coating in the increasing, from a start of coating the first resin to a time when the velocity reaches a third velocity that is higher than the first velocity and lower than the second velocity, and TB2 denotes a thickness of the first coating in the maintaining,
• the increasing includes starting the coating of the first resin on the glass fiber when the velocity of the glass fiber is less than or equal to 0.2 times the second velocity, and
• an increase in the thickness of the first coating per 10 seconds, from the time when the velocity of the glass fiber reaches the third velocity to a time when the velocity of the glass fiber reaches the second velocity, is 1.00 μm at a maximum.