Chinese Science Bulletin

, Volume 59, Issue 22, pp 2684–2692 | Cite as

Ultra-high suppression microwave photonic bandstop filters

  • David Marpaung
  • Blair Morrison
  • Mattia Pagani
  • Ravi Pant
  • Benjamin J. Eggleton
Article Optoelectronics & Laser


A bandstop radio frequency (RF) filter can enhance the capabilities of RF communication systems by removing unwanted signal components such as distortion, or interference. In modern cognitive radio systems, frequency agile filters are desired to block interferers with dynamically changing frequencies and powers. These filters should be tunable over a broad frequency range, and they should be capable of suppressing very strong signals with a high resolution. To simultaneously meet these requirements with traditional RF filters are highly challenging. Microwave photonic (MWP), a technology that primary deals with the generation, distribution, and processing of high speed RF signals using photonic techniques and components, is promising for creating frequency agile RF filters. However, traditional MWP filters are lacking the high resolution and peak suppression exhibited by state-of-the-art RF electrical filters. We recently introduced a new class of MWP notch filter which is free from this limitation. This scheme allowed the creation of anomalously high suppression MWP notch filter from virtually any kind of optical resonance, irrespective of its type (gain or absorption), or its magnitude. This enabled, for the first time, simultaneous optimization of the MWP filter resolution, peak attenuation, and frequency tuning range. In this paper, we present the analysis of notch filter response creation using the novel sideband processing technique. We then show the applicability of this technique to a wide range of optical filters. We compare simulated and experimental results of the notch filter response created using three types of optical filter commonly used in MWP signal processing, namely stimulated Brillouin scattering (SBS), an integrated optical ring resonator (ORR), and a phase-shifted fiber Bragg-grating (FBG).


Microwave photonics RF filters Stimulated Brillouin scattering Ring resonator Nonlinear optics Integrated optics Photonics 


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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • David Marpaung
    • 1
  • Blair Morrison
    • 1
  • Mattia Pagani
    • 1
  • Ravi Pant
    • 1
  • Benjamin J. Eggleton
    • 1
  1. 1.Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), the Institute of Photonics and Optical Sciences (IPOS), School of PhysicsUniversity of SydneySydneyAustralia

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