Design,Simulation and Fabrication of AWG Chip for FBG Demodulation
The miniaturized fiber Bragg grating(FBG)demodulation system is a hot research topic in the field of fiber optics sensing.The development of photonic integration technology has given rise to a series of compact FBG demodulation devices.Arrayed waveguide gratings(AWGs)serve as the core components in photonic integrated demodulation systems.Their spectral characteristics have a significant impact on the demodulation performance of photonic integrated FBG demodulation systems.In this study,we designed,simulated,and fabricated an arrayed waveguide grating(AWG)based on a silicon on insulator(SOI)substrate.Test results indicate that this AWG has an on-chip insertion loss of 3 dB,crosstalk of less than-20 dB,and a 3 dB bandwidth of 2.3 nm.We constructed a demodulation system based on this AWG,and experimental results show that the system achieves a demodulation accuracy of 34.2 pm within a 0.8 nm range,with a wavelength resolution of 6 pm.
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