| 摘要 |
PURPOSE: An optical fiber, a dispersion compensator using the same and an optical transmission system are provided to allow a chromatic dispersion at a set wavelength in the wavelength range of or more 1420 nm but less than 1520 nm to be set to -8 ps/nm/km or less. CONSTITUTION: An optical fiber includes a first glass layer(1), a second glass layer(2) and a third glass layer(3), each of the glass layer(1,2,3) has a different composition between the neighboring layers. A standard layer serving as a standard for the refractive index distribution in these three glass layers(1,2,3) is the third glass layer(3). The first glass layer(1) and the second glass layer(2) are formed inside the third glass layer(3). In other words, the optical fiber is formed such that the outer peripheral portion of the first glass layer(1) is covered by the second glass layer(2), and the outer peripheral portion of the second glass layer(2) is covered by the third glass layer(3).
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