Bending-insensitive broadband dispersion flat single-mode optical fiber

The invention discloses a bending-insensitive broadband dispersion flat single-mode optical fiber which includes a fiber core center round layer, a first annular layer which wraps the fiber core center round layer, a second annular layer which wraps the first annular layer, and a uniform outer cladding layer which wraps the second annular layer, wherein the refractivity of the first annular layer is lower than the refractivity of the uniform outer cladding layer. The optical fiber spreads in an improved total internal reflection method. The high-order mode cutoff wavelength is smaller than 1400nm. The dispersion minimum value under a wavelength of 1400nm is larger than 2.0 ps/(nm*km). The effective area under a wavelength of 1550nm is not smaller than 70.0 mum<2>. When the mode field diameter is not smaller than 9.30 mum and the bending radius is 5mm, the bending loss is from being smaller than 0.2dB/100rings to being smaller than 0.004dB/100rings. Under a wavelength of 1700nm, the dispersion maximum value is from being smaller than 10.7 ps/(nm*km) to being smaller than 10.1 ps/(nm*km).