Open AccessA 2-to-4 decoder switch in SiGe/Si multimode inteference
Author(s) -
Zhiwen Chen,
Zhangjian Li,
Baojun Li
Publication year - 2006
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.002671
Subject(s) - multi mode optical fiber , optics , beam propagation method , modulation index , modal dispersion , optical switch , physics , modulation (music) , interference (communication) , materials science , refractive index , voltage , optical fiber , computer science , telecommunications , pulse width modulation , dispersion shifted fiber , channel (broadcasting) , fiber optic sensor , quantum mechanics , acoustics
Based on multimode interference principle and free-carrier plasma dispersion effect, a SiGe/Si 2-to-4 decoder switch is proposed and simulated. The decoder switch consists of two input single-mode ridge waveguides, a multimode interference section, and four output single-mode ridge waveguides. In the multimode interference section, two index-modulation regions are introduced. Design principle of the decoder switch is described and the device characteristics are demonstrated theoretically by beam propagation method. Simulated results show that the insertion loss of the decoder switch is less than 0.36 dB and the crosstalk is less than -19.7 dB. The device can divert input optical signals to any one of the four output waveguides when a forward bias voltage is applied to the two index-modulation regions.