| 摘要 |
An optical fiber comprising a first core, a second core, a third core, and a cladding, wherein with a refractive index of the cladding as a reference, Delta1 is a maximum value of a relative refractive index difference of the first core, Delta2 is a maximum value of a relative refractive index difference of the second core, Delta3 is a minimum value of a relative refractive index difference of the third core, "a" is a half-value radial width for the relative refractive index difference (Delta1-Delta2) of the first core, "b" is a radius of a second core/third core boundary, and "c" is a radius of a third core/cladding boundary, the expressions 0.30%@Delta1@0.45%, -0.05%@Delta2@0.05%, -0.6%@Delta3@-0.3%, 2.85@b/a, 10 mum@b@15 mum, and 3 mum@c-b@5.5 mum are satisfied, and transmission loss for a wavelength of 1550 nm when the optical fiber is wound around a mandrel with a diameter of 10 mm is no greater than 0.2 dB/turn.
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