We propose and investigate the optimal design of a nonperiodic grating-assisted directional coupler by iterative methods using the beam propagation method. Computer simulations were carried out at wavelengths of 0.8, 1.3, and 1.5 μm, which are often used in optical communications and networking. We found that the complete power coupling lengths can be reduced considerably in comparison with those in the case of the periodic grating-assisted waveguides with the same set of parameters.
© 2001 Optical Society of America
(050.2770) Diffraction and gratings : Gratings
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(220.0220) Optical design and fabrication : Optical design and fabrication
Pojamarn Pojanasomboon and Okan K. Ersoy, "Iterative Method for the Design of a Nonperiodic Grating-Assisted Directional Coupler," Appl. Opt. 40, 2821-2827 (2001)