Coated optical fiber, optical fiber tape core using it and optical fiber unit
   
   

The present invention provides a coated optical fiber in which a silica type optical fiber is coated with n layers (n being an integer of 2 or greater) of UV-curable resin, wherein the sum of respective contraction stress indices FI defined in the n layers of UV-curable resin by the following expression: FI [N]=(Young's modulus [MPa] of the UV-curable resin layer at -40 C.)(cross-sectional area [mm2] of the UV-curable resin layer)(effective linear expansion coefficient [10-6/ C.]/106)(temperature difference 190[ C.]) is 3 [N] or less. The present invention can sufficiently prevent transmission characteristics from deteriorating in a low temperature environment.

 
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