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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 28,
  • Issue 3,
  • pp. 262-269
  • (2010)

Coherence-Free Microwave Photonic Bandpass Filter Using a Frequency-Shifting Recirculating Delay Line

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Abstract

A new microwave photonic filter that realizes a high-resolution bandpass filter response with coherence-free operation and without the limitations of phase-induced intensity noise is presented in this paper. It is based on a frequency-shifting recirculating delay line, which can simultaneously achieve a multitap, high-resolution filter and a very large suppression of noise, while also enabling the use of a conventional narrow-linewidth laser source without suffering from coherent interference effects. Experimental results demonstrate a filter $Q$ value of 200 and an SNR improvement of 40.3 dB compared to conventional recirculating delay line structures.

© 2010 IEEE

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