title: Symmetric profile beams from waveguides with asymmetric grating couplers.
abstract: An accurate method to analyze integrated optics waveguides with a grating is used to design diffractive gratings. A novel approach to produce symmetric diffracted beams is proposed. In this approach, we vary the grating duty cycle along the propagation direction. We demonstrate that this method results in symmetrical diffracted beam profiles.
authors.forename: T
authors.initials: T
authors.lastname: Touam
authors.forename: S I
authors.initials: SI
authors.lastname: Najafi