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Two highly birefringent polymer terahertz (THz) fibers were proposed in thispaper, which were formed with honeycomb cladding and some elliptical air holesin the fiber core. The losses and mode birefringence for two different fibersare investigated by finite-different time-domain method. The results show thatfiber 2 can achieve both high birefringence (larger than 0.022) and lowconfinement loss (0.01 dB/m) in a wide THz frequency range. Moreover, comparedwith a round solid-core fiber, guiding loss of the THz fiber caused by polymermaterial absorption can be reduced effectively as a part of the mode power istrapped in the air holes.

Highly birefringent polymer terahertz fiber with honeycomb cladding