Abstract
We demonstrate a novel microwave photonic filter based on a non-coherent broadband optical source and the variable optical carrier time shift (VOCTS) method. Optical slicing which is essential conventionally is not employed in our scheme. Nevertheless, equivalent "electrical slicing" is performed by VOCTS, generating a passband free from the carrier-suppression effect. The baseband response is eliminated by using carrier-suppression or phase modulation. Single bandpass is also achieved due to the continuous-time sinusoidal impulse response. Detailed theoretical analyses are presented and agree with the experiments quite well.
Highlights
Finite-impulse-response microwave photonic filters (FIR-MPFs) are very attractive in highperformance radar, radio astronomy and millimeter-wave communications [1,2]
The baseband response is eliminated through balanced detection, for which high balances of both power and time delay are required for the two optical paths
Frequency responses free from the baseband response and the carrier suppression effect (CSE) were demonstrated via this variable optical carrier time shift (VOCTS) method
Summary
Finite-impulse-response microwave photonic filters (FIR-MPFs) are very attractive in highperformance radar, radio astronomy and millimeter-wave communications [1,2]. First is the all-positive system constraint, which implies that a baseband response always exists and is larger than the bandpass [3] Another constraint is the dispersion induced carrier suppression effect (CSE) when traditional double-sideband intensity modulation is used [1]. Reference [12] presents a single-passband MPF with no baseband response by exploiting a dual-input Mach-Zehnder modulator and the RF decay effect due to the slice spectral width. Reference [13] proposes a widely tunable chirped MPF based on nonlinear dispersion and a Mach-Zehnder interferometer before the photo detector. Frequency responses free from the baseband response and the CSE were demonstrated via this variable optical carrier time shift (VOCTS) method. We demonstrate a novel MPF based on a non-coherent broadband optical source (BOS) and the VOCTS method. Detailed theoretical and experimental investigations are presented which verifies our basic idea
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