An ultralow-loss and large-effective area
optical fiber of the present invention comprises, orderly from inside to outside, a core layer, cladding
layers and a
coating layer. The core layer is a pure
quartz glass layer, and the
radius of the core layer is between 4 micrometers and 6 micrometers. An inner cladding layer is a
fluorine-doped inner cladding layer, the
radius r2 of the inner cladding layer is between 6 micrometers and 10 micrometers, and the
relative refractive index is between -0.4% and -0.2%. The
radius r3 of an intermediate clapping layer is between 12 micrometers and 25 micrometers, and an outer cladding layer is a pure
silicon dioxide glass layer, and the radius r4 of the outer cladding layer is between 25 micrometers and 45 micrometers. The
coating layer adopts the polyacrylate and comprises an inner
coating layer and an outer coating layer, the
diameter of the inner coating layer is 192 micrometers, and the
diameter of the outer coating layer is 245 micrometers. The advantages of the present invention are that: the comprehensive performance parameters of the
optical fiber, such as the
cut-off
wavelength, the bending loss, the dispersion, etc., are good in an application waveband; the
optical fiber can be used for the long-distance optical
fiber communication spanning the mal-conditions, such as the gobi, the
deep sea, etc.; the
layers of the optical
fiber are good in roundness, so that the round appearance of the optical
fiber is guaranteed; the stress of the optical fiber can reach 2% or even more.