Coherence-free cascade IIR microwave photonic filter with high Q factor

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Coherence-free cascade IIR microwave photonic filter with high Q factor

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A new high-Q infinite impulse response (IIR) microwave photonic filter is demonstrated, in which two active recirculating delay line loops based on a semiconductor optical amplifier (SOA) are cascaded. Due to cross-gain modulation in the SOA, interferences between light beams travelling along different paths are removed, ensuring stable operation and linearity of the electrical transfer function. The whole transfer function comprises a term representing a cascade response of two IIR filters, which significantly increases the free spectral range and the Q factor. The filter exhibits a Q factor of 1870 with a rejection ratio of 25 dB.

Inspec keywords: optical transfer function; microwave photonics; microwave filters; optical modulation; Q-factor; optical delay lines; cascade networks; light interference; semiconductor optical amplifiers; IIR filters

Other keywords: electrical transfer function; coherence-free cascade IIR microwave photonic filter; light beam interference; rejection ratio; SOA; IIR filter; high-Q infinite impulse response microwave photonic filter; cross-gain modulation; active recirculating delay line loops; semiconductor optical amplifier; high Q factor

Subjects: Semiconductor lasers; Laser beam modulation, pulsing and switching; mode locking and tuning; Filtering methods in signal processing; Digital filters; Lasing action in semiconductors; Optical interference and speckle; Microwave photonics

References

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      • L.N. Zhou , X.L. Zhang , E.M. Xu , D.X. Huang . Q value analysis of a first-order IIR microwave photonic filter based on SOA. Acta Phys. Sin. , 1036 - 1041
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      • Hunter, D.B., Minasian, R.A.: `Microwave optical filters based on a fiber Bragg grating in a loop structure', Proc. Int. Top. Mtg on Microwave Photonics, (MWP'06), 2006, Genoble, France, p. 273–276.
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