Integrated Spiral Waveguide Filter with 55 Arbitrary Notches: Design and Fabrication

We design and fabricate an integrated arbitrary filter near 1550 nm. The 50 mm long 55-notch filter is implemented on a low-loss Si 3 N 4 /SiO 2 spiral waveguide. The notches have uniform depths/widths of about 28 dB/0.22 nm.