To provide an optical fiber having an MFD (mode field diameter) conforming to G652 standard (preferably 9 μm or above), improved bending characteristics, and for operating in a multi mode at 850 nm and having a wide transmission band.
The optical fiber includes: a first core at a center thereof; a second core adjacent to the first core to cover a circumference of the first core; a third core adjacent to the second core to cover a circumference of the second core; and a cladding adjacent to the third core to cover a circumference of the third core, where conditions of 0.28%≤Δ1≤0.4%, -0.05%≤Δ2≤0.05%, -1.0%≤Δ3≤-0.5%, 3.8 μm≤a≤4.5 μm, 12 μm≤b≤21 μm, and 1.5 μm≤c-b≤10 μm hold, where Δ1 is a specific refractive index difference of the first core from the cladding refractive index, Δ2 is a specific refractive index difference of the second core from the cladding refractive index, Δ3 is a specific refractive index difference of the third core from the cladding refractive index, "a" is a radius of a boundary between the first core and the second core with respect to a center of the first core, "b" is a radius of a boundary between the second core and the third core with respect to the center of the first core, and "c" is a radius of a boundary between the third core and the cladding with respect to the center of the first core.
| JP2010503019A | 2010-01-28 | |||
| JP2007535003A | 2007-11-29 | |||
| JP2006078543A | 2006-03-23 |
| WO2004092794A1 | 2004-10-28 |
Naotaka Kono
Kanji Arai
Akiko Ishii