Microwave Correlator Based on a Nonuniformly Spaced Photonic Microwave Delay-Line Filter

We propose and demonstrate a novel technique to perform matched filtering of a phase-coded microwave signal using a photonic microwave delay-line filter. The photonic microwave delay-line filter is designed to have a frequency response that is conjugate to the spectrum of the phase-coded microwave s...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-07, Vol.21 (14), p.969-971
Main Authors: Yitang Dai, Yitang Dai, Jianping Yao, Jianping Yao
Format: Article
Language:English
Subjects:
Conjugates
Correlation
Correlators
Decoding
Delay
Equivalence
Filtering
Filtration
Frequency response
Matched filters
Microwave correlator
Microwave filters
microwave photonics
Microwave theory and techniques
Microwaves
nonuniformly spaced sampling
Optical filters
Photonics
Signal design
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Summary:We propose and demonstrate a novel technique to perform matched filtering of a phase-coded microwave signal using a photonic microwave delay-line filter. The photonic microwave delay-line filter is designed to have a frequency response that is conjugate to the spectrum of the phase-coded microwave signal. To implement the delay-line filter, the tap coefficients are usually complex, which is difficult to implement in the optical domain. In this letter, a photonic microwave delay-line filter with equivalent complex coefficients implemented using an all-positive-coefficient photonic microwave delay-line filter based on a nonuniformly spaced delay-line structure is proposed. Since only positive coefficients are required, the implementation of the filter is greatly simplified. An experiment is performed. The decoding of a 6.75-GHz binary-phase-coded microwave signal is experimentally demonstrated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2021153