Abstract

This paper proposes a double fiber taper-based mode converter that converts ${\mathrm{LP}}_{01}$ to ${\mathrm{LP}}_{02}$ and vice versa. The first taper is used to convert ${\mathrm{LP}}_{01}$ to some higher order ${\mathrm{LP}}_{0m}$ ($m>1$) modes while the second taper suppresses the undesired higher order modes ($m>2$) and results in ${\mathrm{LP}}_{02}$ overwhelmingly dominated. A simulation shows that conversion efficiency of almost 100% at the central wavelength of O-, S-, and C-Band, and above 98% over the S- and C-Band was achieved. Moreover, suppression of undesired higher order modes is more than 10 dB over the whole O-, S-, and C-Band. In particular, the suppression is more than 19 dB for the whole C-Band. The analysis also shows that the performance of the mode converter is not sensitive to slight variations of the converter’s parameters. The same converter also can be used to convert ${\mathrm{LP}}_{02}$ back to ${\mathrm{LP}}_{01}$. It is shown that conversion efficiency higher than 99% and suppression of undesired higher order modes higher than 30 dB can be obtained. Further, a (de)multiplexer for an ${\mathrm{LP}}_{02}$ and an ${\mathrm{LP}}_{01}$ mode was designed using the mode converter combined with a symmetric directional coupler. The multiplexer is broadband and has an insertion loss less than 0.5 dB in the C-Band.

© 2015 Optical Society of America

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