Abstract
We present a single-mode multilayer-core fiber with a large mode
area (LMA) and a low bending loss in this Letter. A low equivalent
core-cladding refractive index difference is achieved by exploiting the
multilayer structure. The multilayer structure has a better bending
performance than a traditional step-index core and this structure also
contributes to realizing different curved refractive index profiles that
have a better bending performance. An index trench is also introduced to
dramatically reduce the bending loss. The experimental results show that,
at a wavelength of 1550 nm, the mode area of the fabricated fiber is about
215.5 μm2 and the bending loss is 0.58 dB/turn at a 10 mm
bending radius. The LMA and excellent bending performance can be obtained
simultaneously with the proposed fiber.
© 2016 Chinese Laser Press
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