title: Design of a high-efficiency seven-port beam splitter using a dual duty cycle grating structure.
abstract: In this paper, we propose a compact seven-port beam splitter which is constructed using only a single-layer high-density grating with a dual duty cycle structure. The properties of this grating are investigated by a simplified modal method. The diffraction efficiency can be achieved around 10% more than conventional Dammann gratings while the uniformity can still be maintained at less than 1%. The effect of deviations from the design parameters on the performance of the grating is also presented.
authors: Department of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong SAR, China.
authors: Fung Jacky
authors: FJ
authors: Wen
authors: Po Sheun
authors: PS
authors: Chung