We propose a method to reduce cross talk by using single-mode filters, namely, extracting the fundamental mode from a multimode optical network (EFMON). The EFMON effect is evaluated for a three-step switching system consisting of cascade electro-optic (EO) waveguide prism deflector (WPD) micro-optical switches (MOSs) and a multimode waveguide network. The WPD MOS is optimized for single-mode operation in lead lanthanum zirconate titanate thin films as EO slab waveguides with a driving voltage of 12 V, a length of 310 μm, and a channel distance of 20 μm. Beam propagation method simulation reveals that mode disturbance, higher-order modes, and cross talk are accumulated by switching steps. A single-mode filter for EFMON in the output region of the switching system reduces cross talk to below −20 dB at a propagation length of 2000 μm in the single-mode filter and below −30 dB at 20000 μm.
© 2004 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(130.2790) Integrated optics : Guided waves
(230.2090) Optical devices : Electro-optical devices
(230.7400) Optical devices : Waveguides, slab
Tetsuzo Yoshimura, Masanori Ojima, Yukihiko Arai, Nobuhiro Fujimoto, and Kunihiko Asama, "Simulation of Cross-Talk Reduction in Multimode Waveguide-Based Micro-Optical Switching Systems by Use of Single-Mode Filters," Appl. Opt. 43, 1390-1395 (2004)