Abstract:We propose and experimentally demonstrate a simple tunable photonic microwave notch filter with positive and negative coefficients. The negative coefficient is obtained from a single input signal (positive coefficient) using cross gain modulation (XGM) in a reflective semiconductor optical amplifier (RSOA). When the RSOA is operated in the saturated region, the signal carried on the pump wavelength is inversely copied to the probe wavelength by the XGM effect, showing a negative coefficient. This probe wavelen… Show more
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