For the high absorption loss of the Electro-optic (EO) polymers, there are only a few reports on polymeric EO switches.
This paper presents a new design and fabrication method of the polymer 1×2 Mach-Zehnder Interference (MZI) switch
operating at 1550nm. The switch is consists of two vertically coupled waveguides located at different levels. And it will
be easier to fabricate by traditional technology. The finite difference Beam Propagation Method (BPM) has been used to
analyze the device propagation characteristics. The result indicated that the propagation loss of this Three-dimensional
(3-D) switch is decreased 2dB by that of the ordinary two-dimensional (2-D) switch. And this kind of structure has high
potential for the application of low-loss optical modulator and attenuator.