Tunable optical filters using compound ring resonators for DWDM
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The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.
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The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.
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Optical filters, Optical ring resonators, Wavelength division multiplexing, Mirrors, Optical fiber filters, Optical tuning, Directional couplers, Sagnac interferometers, Resonator filters, Integrated optics, Optical filters, Optical ring resonators, Wavelength division multiplexing, Mirrors, Optical fiber filters, Optical tuning, Directional couplers, Sagnac interferometers, Resonator filters, Integrated optics