A Multi-Beam Network Based on Silicon-Based Optical Waveguide

In this paper, a multi-beam network based on silicon-based optical waveguides is proposed. The multi-beam network is in the form of a Butler matrix consisting of coupler and phase shifter. First, the 90° bridge, cross coupler and phase shifter are designed to achieve good coupling or phase shifting effect. Then these elements are cascaded to form a Butler matrix. After simulation and optimization, the multi-beam network works at 1550 nm wavelength and achieves four phase differences between output ports: −45°, 135°, −135°, and 45°. Low transmission loss and beam steering characteristics make this Butler matrix applicable to multi-beam feeding network.