Tunable optical filtering device and method
June 17, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInfrared acousto-optic tunable filter Rapidly tunable wideband integrated optical filter Wavelength filter arrangements for use in fiber optics Reconfigurable device for insertion-extraction of wavelengths Wavelength division multiplexer/demultiplexer optical device Wavelength-division multiplexed M×N×M cross-connect switch using active microring resonators Tunable fiber optic filter Tunable add/drop filter Calibrated tunable fiber fabry-perot filters for optical wavelength scanners and optical spectrum analyzers Guided wave electrooptic and acoustooptic tunable filter apparatus and method Patent #: 6721466 InventorAssigneeApplicationNo. 10173540 filed on 06/17/2002US Classes:385/27, Particular coupling function385/14, INTEGRATED OPTICAL CIRCUIT359/308, Filter385/24, Plural (e.g., data bus)385/37, Grating385/140, Attenuator359/578, Electrically or mechanically variable (e.g., tunable, adjustable)356/519, Having partially reflecting plates in series (e.g., Fabry-Perot type)385/11, POLARIZATION WITHOUT MODULATION385/18Reflective-type switchExaminersPrimary: Le, Thien M.Attorney, Agent or FirmForeign Patent References
International ClassG02B 642AbstractA tunable filter structure, and an optical method and device utilizing the same are presented for processing a multi-frequency light signal to separate therefrom a desired frequency range. The filter structure has an input for receiving the multi-frequency input light signal, a first output for outputting a first light component of the input light signal including light of said predetermined frequency range, a second output for outputting a second light component including a remaining portion of the input light signal, and an intermediate input. The first output and the intermediate input of the filter structure may be connected to, respectively, input and output of a tunable frequency-selective optical unit, which may be a second filter structure, amplifier, attenuator. By using the second filter structure with a different tuning range as compared to that of the first filter structure such that these tuning ranges define overlapping spectra of the filter structures, a two-stage filter device is provided.Other References
Field of SearchParticular coupling functionPOLARIZATION WITHOUT MODULATION INTEGRATED OPTICAL CIRCUIT Grating Reflective-type switch Plural (e.g., data bus) Attenuator WITH OPTICAL COUPLER Electrically or mechanically variable (e.g., tunable, adjustable) By nonmovable driving element (e.g., piezoelectric, magnetostrictive) ABSORPTION FILTER Movable in or out of optical path Variable grating Multilayer filter or multilayer reflector | |
