SBS-based Tunable Microwave Photonic Notch Filter and Amplifier Simultaneously with Enhanced Gain, Bandwidth, and Polarisation Control up to 50 GHz

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Stimulated Brillouin Scattering (SBS) based filters can provide high gain, narrow bandwidth, and wideband tunability, which are critical for modern radio frequency systems. However, it is important to optimise all performance parameters to obtain stable response over wideband along with high gain. We present a novel SBS-based Tuneable Microwave Photonics Notch Filter and Amplifier (TMWPNFA) configuration that can perform notch filtering, selective amplification or both simultaneously by exploiting additional Brillouin gain modes and using both SBS stokes and anti-stokes in single-mode fibre. The TMWPNFA amplification and notch suppression are shown for maximum of 50 GHz in Radio Domain, which is the highest reported tunability to our knowledge. The TMWPNFA exhibits high gain of ≃35dB by employing Radio Frequency Amplifier. The TMWPNFA achieves SBS gains from 24 to 4 dB over the range. The suppression achieved by TMWPNFA ranges from 12 to 3 dB. We demonstrated the SBS pump's RF Mixing approach for increasing the -3dB bandwidth of TMWPNFA to 35 MHz, resulting in greater separation of the amplification and suppression bands. The TMWPNFA phase noise distortion caused by SBS is measured to be < -8.6dBc/Hz at 125 kHz Spacing. The filter achieved sharp -3 dB bandwidth of 20 MHz and Q factor of 200 to 2500. The Degree of Polarisation of the SBS pump is shown to be the source of 6 dB gain control. It is shown that additional sound modes produced by SBS, separated by ≈2 x Bandwidth of SBS can be used for notch filtering while simultaneously achieving selective amplification. The proposed 50GHz TMWPNFA would provide unique benefits for satellite, aerospace and beyond communication technologies.
Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalIEEE Transactions on Instrumentation and Measurement
Early online date18 Dec 2023
Publication statusE-pub ahead of print - 18 Dec 2023


  • Microwave Photonics
  • Tuneable filters
  • Stimulated Brillouin Scattering (SBS)
  • Tuneable Microwave photonics filters

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