Large Mode Area Single Trench Fiber for 2 μm Operation

Performance of single trench fibers has been investigated using finite-element method at 2 μm wavelength. Numerical investigations show that an effective single mode operation for large effective area between 3000-4000 μm
²
and 2000-3000 μm
²
can be achieved at ~40 and ~25 cm bend radius, respectively, by exploiting high delocalization of the higher order modes. Achievement of a large effective-area can be very useful to address nonlinear effects. Moreover, single trench fiber offers certain advantages such as low-cost fabrication and easy postprocessing (such as cleaving and splicing) thanks to the all-solid fiber design.