Band-pass optical filter with asymmetric cut-off wavelength

The utility model discloses a band-pass optical filter with an asymmetric cut-off wavelength. The band-pass optical filter comprises a substrate and a plurality of Fabry-Perot cavity cascades formed on the substrate. The structure of the Fabry-Perot cavity comprises (HL) m n (2H) (iLjH) m; h is a quarter-wavelength high-refractive-index material, and L is a quarter-wavelength low-refractive-index material; i > = 0.2, i < = 1.8, j > = 0.2, j < = 1.8, and i + j = 2; by adjusting the values of i and j, the adjustment of cut-off wavelength bandwidths on two sides of a passband is realized. By adjusting the optical thickness ratio of the high refractive index and the low refractive index of the band-pass optical filter, the cut-off wavelength range on the two sides of a pass band is adjusted, so that the requirement of a cut-off film is reduced, and the cost is reduced. The band-pass optical filter with the asymmetric cut-off wavelength combines the advantages of the traditional band-pass optical filter based on t