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Array of grating–fiber couplers

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Abstract

Along a single-mode fiber a number M of grating–fiber couplers are fabricated at equal spacings L0. The fiber is coiled so that the couplers lie side by side, forming a planar optical antenna array. With varying optical frequency the resulting radiation lobes sweep slowly along the meridional direction but fast along the orthogonal azimuthal direction. In a spectrometer-type setup with M = 3 and L0 = 300 mm a frequency resolution of 230 MHz is demonstrated.

© 1990 Optical Society of America

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