We propose a novel femtosecond laser writing approach allowing the fabrication of arbitrary long optical waveguides in coreless optical fibers, directly through the coating. In a silica fiber, we demonstrate a 4m-long single-mode waveguide operating at 1 µm. The refractive index distribution and the spatial mode are characterized. Using a cutback method, the propagation losses of the laser-inscribed waveguides are properly measured. This approach paves the way toward the fabrication of complex arrangement of cores in various optical fibers.
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