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A large mode field fiber with bend-resistance is proposed to work at 1550-nm wavelength. After modulation by high refractive index rings introduced in the core and cladding, this fiber can ensure the single-mode operation under a tight bend radius of 10 cm. The finite element method with perfect matching layers (PML) is used to simulate the proposed fiber. Numerical results show that the effective mode area can reach up to 1518.814 μm2 with a 0.004073 dB / m low bending loss of the fundamental mode. The designed all-solid-state fiber has a symmetrical structure and takes no consideration of the bending direction. This fiber has potential applications in high-power lasers. [ABSTRACT FROM AUTHOR]