Abstract

In this paper, a fiber-based tunable mode rotator is proposed and demonstrated by using the few mode-polarization maintaining fiber (FM-PMF). The mode birefringence in the FM-PMF causes phase difference between two orthogonal degenerate modes. With rotating the FM-PMF segment and getting a variation of aligning angle between the injected ${\mathrm{LP}}_{11}$ (${\mathrm{LP}}_{21}$) mode axis and FM-PMF axis, another intended ${\mathrm{LP}}_{11}$ (${\mathrm{LP}}_{21}$) mode with a certain orientation can be controllably generated at the FM-PMF output.

© 2016 Optical Society of America

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