Abstract
In this paper, we propose a broadband silicon Mach–Zehnder switch (MZS) for
wavelength division multiplexing applications on photonic networks on chip. The proposed
reconfigurable switch is based on a single-stage three-waveguide interferometric
configuration in which the phase shift is achieved via a p-i-n diode. The device is
analyzed by the coupled-mode theory and by the finite-difference beam propagation
method. The proposed configuration leads to a considerable increase in the bandwidth
with respect to the conventional MZS. For example, the two-waveguide MZS with a gap
g=0.30 μm between the two coupled waveguides exhibits bandwidth Δλ
=60 nm, crosstalk CT = - 15 dB, and insertion loss IL = 1.1 dB.
Conversely, a bandwidth Δλ =115 nm is achieved for the three-waveguide
configuration to parity of the other parameters.
© 2012 IEEE
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