Integrated all-pass filters for tunable dispersion and dispersion slope compensation
01 December 1999
New integrated optical all-pass filters are presented that can be used for tunable dispersion compensation, dispersion slope compensation, and as building blocks in tunable bandpass filters. The dispersion slope compensation capability is demonstrated using ring resonators in Delta = 2% Ge-doped silica planar waveguides. In addition, a tunable four-stage filter with free-spectral range (FSR) = 25 GHz, a passband width of 14 GHz (0.56 x FSR), and D = 1800 ps/nm is reported.