A silicon nitride narrow-band multimode waveguide Bragg grating (NBMWBG) optical filter with high SLSR and low insertion loss based on the inverse design of MWBG is demonstrated. The complementary lateral-misalignment modulation apodization is used to create physically grating structure of NBMWBG. The insertion loss, 3-dB bandwidth and SLSR of proposed NBMWBG are measured to be 0.9 dB, 0.8 nm and 32 dB, respectively. Keywords: Silicon nitride, Bragg grating, Narrow-band,
A polarization-insensitive optical filter based on silicon and silicon nitride film is demonstrated. The lateral-shift apodization is introduced to suppress the sidelobes. The fabricated optical filter shows polarization-insensitive performances with large 3dB-bandwidths of 3.5–5.1 nm, low losses of 1.72-1 dB, decent SLSRs of 18.5-19.1 dB for both polarizations.
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