Propagation constant errors (PCEs) of guided modes in regions of multimode interference in optical networks were analyzed. Results show that a graded-index waveguide can effectively decrease the PCEs. An example based on an exponential function is presented. Numerical results show that addition of a graded-index waveguide greatly improves device performance in this structure.
© 2002 Optical Society of America
(130.0130) Integrated optics : Integrated optics
(130.3120) Integrated optics : Integrated optics devices
(230.1360) Optical devices : Beam splitters
(230.3120) Optical devices : Integrated optics devices
Rui Yin, Xiaoqing Jiang, Jianyi Yang, and Minghua Wang, "Structure with improved self-imaging in its graded-index multimode interference region," J. Opt. Soc. Am. B 19, 1301-1303 (2002)