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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