Design of 1×8 silicon nanowire arrayed waveguide grating for on-chip arrayed waveguide grating demodulation integration microsystem

The integration of fiber grating demodulation system is a research emphasis in the study of demodulation systems. On-chip arrayed waveguide grating (AWG) demodulation integration makes integration possible in a demodulation system. A 1×8 silicon nanowire AWG for on-chip AWG demodulation integration microsystem is proposed and designed. The center wavelength is 1550.918 nm, the waveguide width is 350 nm, the waveguide thickness is 220 nm, and the effective area is 267×259 μm2. The single-mode waveguide cross-section structure is designed according to the refractive index of the silicon-on-insulator material. The mask layout territory of the 1×8 AWG is designed and optimized using the beam propagation method. A cone-shaped mold spots converter is proposed in the design process. Furthermore, the wavelength-division-multiplexing-phasar simulation system is established to simulate the stable output optical propagation characteristics of the designed AWG. The simulation result shows that the insert loss of the AWG is 10.658 dB, and the crosstalk is 3.037 dB, which is lower under the same waveguide, thickness, and size. This condition makes the AWG design the best choice for a fiber Bragg grating demodulation microsystem.