Experiment and Theory of an Active Optical Filter ABSTRACT:The role of gain in an optical filter is advanced by good agreement between theory and experiment presented herein. The particular integrated photonic filter is composed of four semiconductor optical amplifiers and one four-port coupler located at the intersection of the amplifiers. The four-port coupler is realized using frustrated total internal reflection off a very thin slab of alumina embedded in the substrate. The delta function response of the filter is measured using an ultra-fast laser and cross-correlator, and the measured transfer functions agree well with a $z$-transform-based description of the device. Did you like this research project? To get this research project Guidelines, Training and Code... Click Here facebook twitter google+ linkedin stumble pinterest Characterization of Single-Crystal Synthetic Diamond for Multi-Watt Continuous-Wave Raman Lasers First Laser Action Observed From Optically Pumped $_}}$