The chirally-coupled core fibers exhibit excellent single mode performance without any external mode managements. In this paper, we numerically investigated effects of fiber parameters including side core size, NA, helix pitch and offset distance on high order modes loss. A general range of parameters was given for fiber design. The results indicate that to achieve high loss for side modes, the fiber requires side core diameter ranging at a dozen micrometers with a numerical aperture 0.09 and the helix pitch taking values in millimeter magnitude.
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