Multiple-bipolar-tap tunable spectrum sliced microwave photonic filter
A spectrum sliced microwave photonic signal processor structure, which is all-fiber based and features simplicity, together with the ability to realize tunability, reconfigurability, bipolar taps, and multiple-tap rf filtering, is presented. It is based on thermally controlled optical slicing filters induced into two linearly chirped fiber Bragg gratings. Experimental results demonstrate the realization of versatile microwave photonic filters with frequency tunable, reconfiguration, and bipolar-tap generation capabilities.
- [Show abstract] [Hide abstract] ABSTRACT: We report a new mcirowave photonic filter that offers continously tunable true time delays, based on the concept of fractional delay lines. Proof of concept experiments demosntrate a 10-tap microwave photonic fractional delay filter.0Comments 0Citations
- [Show abstract] [Hide abstract] ABSTRACT: Recent developments in microwave photonic signal processing featuring tunability and reconfigurablity are presented in the paper, with emphasis on the realisation of multi-tap microwave photonic filters, and programmable signal processing functions based on photonic approaches.0Comments 0Citations
- [Show abstract] [Hide abstract] ABSTRACT: A tunable negative-tap photonic microwave filter using a cladding-mode coupler together with optical injection locking of large wavelength detuning is demonstrated. Continuous and precise tunability of the filter is realized by physically sliding a pair of bare fibers inside the cladding-mode coupler. Signal inversion for the negative tap is achieved by optical injection locking of a single-mode semiconductor laser. To couple light into and out of the cladding-mode coupler, a pair of matching long-period fiber gratings is employed. The large bandwidth of the gratings requires injection locking of an exceptionally large wavelength detuning that has never been demonstrated before. Experimentally, injection locking with wavelength detuning as large as 27 nm was achieved, which corresponded to locking the 36-th side mode. Microwave filtering with a free-spectral range tunable from 88.6 MHz to 1.57 GHz and a notch depth larger than 35 dB was obtained.0Comments 7Citations