Cosine S-bend hybrid junction digital optical switch

Abstract

This paper presents the design of digital optical switch (DOS) which exhibit low crosstalk, low insertion loss and low power consumption. The geometry of Y-junction was simulated and optimized using finite difference beam propagation method (FD- BPM). The optimized Y-junction shape has been determined to be hybrid shape which consists of cosine s-bend branch connected to linear branch. Compare to conventional linear Y-junction, the effective index modulation was reduced to 26.5% to achieve -34 dB of crosstalk value.