OPTICAL FIBER

摘要

The present invention provides an optical fiber in which transmission loss does not tend to increase even if the optical fiber is submerged in water and dried, and which has solvent resistance and microbending resistance properties. The optical fiber (1) according to one embodiment of the present invention is coated with at least two layers of a coating resin (3) around the outer periphery of a glass optical fiber (2). When the Young's modulus of a first coating layer (31) of the coating resin (3) is PY (MPa) and the leaching rate of the coating resin (3) when the optical fiber (1) is immersed in warm water at 60°C for 168 hours is E (mass%), PY=0.55 MPa and the formula 1.8=E=8.61×PY+1.40 is fulfilled.