Tunable microwave photonic filter based on chirped fiber gratings working with a single optical carrier at constant wavelength (original) (raw)

Tunable Photonic Microwave Filter With Single Bandpass Based on a Phase-Shifted Fiber Bragg Grating

IEEE Photonics Technology Letters, 2000

A novel tunable photonic microwave single bandpass filter based on the optical resonance originated by a local phase shift introduced in the periodic structure of a fiber Bragg grating is proposed. Dynamic control of the phase shift is obtained employing a piezoelectric transducer in order to stretch the grating, thus changing the resonance wavelength. A photonic microwave filter is obtained by using an optical single-sideband modulation. Experimental results are provided in order to prove the concept.

Continuously tunable microwave-photonic filter design using high-birefringence linear chirped grating

IEEE Photonics Technology Letters, 2003

A continuously tunable, coherence free microwave photonic filter is proposed and experimentally demonstrated. The filter is based on a high-birefringence linearly chirped fibre Bragg grating (Hi-Bi LCFBG) as the tuning component. The filter response tunability is realized through changing the differential group delay of the Hi-Bi LCFBG by applying gradient tension or adjusting the operating wavelength. Free spectral range tuning by 1.11 GHz with about 40 dB notch rejection is achieved.

Photonic microwave tunable single-bandpass filter based on a Mach-Zehnder interferometer

IEEE/OSA Journal of Lightwave Technology, 2006

The authors present the theoretical analysis and experimental demonstration of a novel single-bandpass tunable microwave filter. The filter is based on a broadband optical source and a fiber Mach-Zehnder interferometer and shows a high Q factor over a tuning range of 5-17 GHz. A generalized analysis considering that the optical signal propagates along optical delay lines with a dispersion slope different from zero is presented.

Photonic microwave transversal filter employing a fiber-Bragg-grating-based multiple resonator

Microwave and Optical Technology Letters, 2005

In this paper, we present a photonic microwave transversal filter with a multiple-fiber resonator formed by cascaded fiber Bragg gratings. The filter-free spectral range is extended via the Vernier effect, which can increase the filter rejection bandwidth and suppress the unwanted periodic passbands. The experiment is demonstrated to confirm the feasibility of the proposed scheme. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 369–371, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20637

Tunable microwave-photonic filter using frequency-to-time mapping-based delay lines

Optics Express, 2013

A new implementation of microwave-photonic filters (MPFs) based on tunable optical delay lines is proposed and demonstrated. The variable delay is based on mapping of the spectral components of an incoming waveform onto the time domain, the application of linearlyvarying temporal phase offsets, and an inverse mapping back to the frequency domain. The linear phase correction is equivalent to a frequency offset, and realized though suppressed-carrier single-sideband modulation by a radio-frequency sine wave. The variable delay element, controlled by the selected frequency, is used in one arm of a two-tap MPF. In a proof-ofconcept experiment, the free spectral range (FSR) of the MPF was varied by over a factor of four: between 1.2 GHz and 5.3 GHz.

Fully programmable spectrum sliced chirped microwave photonic filter

Optics express, 2015

A novel chirped microwave photonic filter (MPF) capable of achieving a large radio frequency (RF) group delay slope and a single passband response free from high frequency fading is presented. The design is based upon a Fourier domain optical processor (FD-OP) and a single sideband modulator. The FD-OP is utilized to generate both constant time delay to tune the filter and first order dispersion to induce the RF chirp, enabling full software control of the MPF without the need for manual adjustment. An optimized optical parameter region based on a large optical bandwidth >750 GHz and low slicing dispersion < ± 1 ps/nm is introduced, with this technique greatly improving the RF properties including the group delay slope magnitude and passband noise. Experimental results confirm that the structure simultaneously achieves a large in-band RF chirp of -4.2 ns/GHz, centre frequency invariant tuning and independent reconfiguration of the RF amplitude and phase response. Finally, a st...