Simulation of cross-talk reduction in multimode waveguide-based micro-optical switching systems by use of single-mode filters.
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 microm, and a channel distance of 20 microm. 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 microm in the single-mode filter and below -30 dB at 20000 microm.
Department of Electronics, Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan. tetsu@cc.teu.ac.jp
Tetsuzo
T
Yoshimura
Masanori
M
Ojima
Yukihiko
Y
Arai
Nobuhiro
N
Fujimoto
Kunihiko
K
Asama