Numerical investigation on the design of a novel kind of large-mode-area optical fiber is presented. Low bending loss propagation in the fiber is achieved by the introduction of low-index rods with small period and large normalized diameter in one segment of the cladding. Single-mode operation is realized by the introduction of low-index rods with large period and small normalized diameter in another segment of the cladding. When a conventional large-mode-area optical fiber is bent, it will generally experience large bend distortion and the mode area will reduce accordingly. To avoid that, a bend-resistant design by introducing a microstructure into the solid core of the proposed fiber is proposed. In particular, the mode area of one such fiber is always larger than 2000 μm2 when the bending radius is larger than 30 cm at the wavelength of 1.064 μm.
© 2011 IEEE
Ming-Yang Chen and Yong-Kang Zhang, "Bend Insensitive Design of Large-Mode-Area Microstructured Optical Fibers," J. Lightwave Technol. 29, 2216-2222 (2011)