Abstract

A novel broadband ${\mathrm{LP}}_{01}\leftrightarrow {\mathrm{LP}}_{02}$ mode converter for dispersion compensation based on special dual-core fiber is theoretically investigated by using the coupled-mode theory. The simulated mode converter has $\sim 22\mathrm{nm}$ bandwidth with a conversion efficiency of over 80%. Furthermore, this noncomplete conversion only introduces the insertion loss rather than multipath interference resulting from the residual ${\mathrm{LP}}_{01}$ mode. Finally, one optimal scheme for broadening the bandwidth of high-efficiency conversion has been proposed by longitudinally tapering the dual-core fiber. The simulation results show that the conversion bandwidth can be improved to $\sim 31\mathrm{nm}$ by tapering with a scaling range of only 2%.

©2012 Optical Society of America

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