A high-
crosstalk array
waveguide grating structure capable of changing waveforms and improving
demodulation resolution comprises an input optical
waveguide, the output end of the input optical
waveguide is connected with the input end of a
coupling module, and the output end of the
coupling module is sequentially connected with a first slab waveguide, an array waveguide and a second slab waveguide. The output end of the second slab waveguide is respectively connected with the input ends of the first output waveguide, the second output waveguide, the third output waveguide and the fourth output waveguide; according to the invention, the array
waveguide grating structure connected with the
coupling module at the input end is adopted, so that the output spectrum of the adjacent output channels has large bandwidth, the
large dynamic range of the adjacent channels during FBG
wavelength demodulation is ensured, an optical waveguide width value different from a design value is adopted, the top end waveform of the output spectrum is regulated and controlled, and the
demodulation precision is improved. On the premise of ensuring that the
dynamic range of adjacent output channels is not changed, the resolution of the demodulation
wavelength is improved; the device has the advantages of simple structure, large bandwidth, high
crosstalk and high
wavelength demodulation resolution.