Low bend loss single mode optical fiber with bromine up-doped cladding

摘要

According to embodiments, an optical fiber may include a core portion comprising an outer radius r_C and a maximum relative refractive index Δ_Cmax. A cladding may surround the core portion and include a low-index trench and an outer cladding. The low index trench may surround the core portion and includes an outer radius r_T and relative refractive index Δ_T. The outer cladding may surround and be in direct contact with the low-index trench. The outer cladding may be formed from silica-based glass comprising greater than 1.0 wt. % bromine and has a relative refractive index Δ_OC, wherein Δ_CmaxΔ_OCΔ_T. The optical fiber may have a cable cutoff of less than or equal to 1530 nm. An attenuation of the optical fiber may be less than or equal to 0.185 dB/km at a wavelength of 1550 nm.