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Focusing grating couplers for polarization detection

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4 Author(s)

A new polarization detection method using focusing grating couplers was proposed and demonstrated. Mode dispersion of a waveguide and high selectivity of the coupling condition of the grating is utilized for detecting the polarization state of a beam in the air. The crosstalk depends on the grating aperture and the index difference between TE and TM modes in the waveguide. A high performance device was designed and fabricated, and the function was experimentally confirmed by using a laser diode of 0.83 μm wavelength

Published in:

Journal of Lightwave Technology  (Volume:6 ,  Issue: 6 )