Abstract
Optical switches are important in signal routing and switching. In this paper, a thermal optical switch with trapezoidal air trenches is proposed. The proposed structure consists of two cascaded 4×4 multimode interference (MMI) couplers. The beam propagation method is used to optimize the dimension and analyze the characteristics. Simulation results show excess loss (EL) and insertion loss (IL) are less than 0.14dB and 0.22dB at the wavelength of 1550nm, respectively. Besides, the extinction ratio (ER) is higher than 21dB. This design has the advantages of small size, low loss, and high flexibility, which is promising for application to all-optical network routing.
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