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On-chip rotated polarization directional coupler fabricated by femtosecond laser direct writing
We present a rotated polarization directional coupler (RPDC) on a photonic chip.We demonstrate a doubletrack approach to modify the distribution of refractive index between adjacent tracks and form a single waveguide with arbitrary birefringent optical axis.We construct a RPDC with the two axis-rotated waveguides coupled in a strong regime.The obtained …