Abstract

We have used two different photonic crystal fiber (PCF) techniques to make all-fiber mode converters. An ${\mathrm{LP}}_{01}$ to ${\mathrm{LP}}_{11}$ mode converter was made by the ferrule technique on a drawing tower, and an ${\mathrm{LP}}_{01}$ to ${\mathrm{LP}}_{02}$ mode converter was made by controlled hole inflation of an existing PCF on a tapering rig. Both devices rely on adiabatic propagation rather than resonant coupling; so high extinction was achieved across a wide wavelength range.

© 2007 Optical Society of America

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