Abstract
We experimentally demonstrate a novel tunable true-time delay line with separate carrier tuning using dual-parallel Mach-Zehnder modulator and stimulated Brillouin scattering-induced slow light. The phase of the optical carrier can be continuously and precisely controlled by simply adjusting the dc bias of the dual-parallel Mach-Zehnder modulator. In addition, both the slow light and single-sideband modulation can be simultaneously achieved in the stimulated Brillouin scattering process with three types of configuration. Finally, the true-time delay technique is clearly verified by a two-tap incoherent microwave photonic filter as the free spectral range of the filter is changed.
Highlights
Tunable photonic delay lines have attracted considerable attention due to their wide range of potential applications [1,2], such as phased array antennas (PAA), microwave photonic filters (MPF) and arbitrary waveform generators
true-time delay (TTD) have to be introduced to most MPFs which rely on discrete-time signal processing using real valued coefficients
We have experimentally demonstrated a tunable TTD line with separate carrier tuning (SCT) using DPMZM and SBSinduced slow light
Summary
Tunable photonic delay lines have attracted considerable attention due to their wide range of potential applications [1,2], such as phased array antennas (PAA), microwave photonic filters (MPF) and arbitrary waveform generators. The RF carrier frequency is much higher than the data signal bandwidth It means that no information is carried in the wide frequency range between the optical carrier (OC) and the single-sideband (SSB) microwave envelope. Compared with the OC phase-shifting methods reported in [18,19] using additional FBG or SBS-induced phase-shifting process, the phase of the OC in our method can be continuously and precisely tuned up to 360° by adjusting the dc bias of the modulator without using any complementary elements This would significantly reduce the complexity of the system and increase the stability of the TTD line. Both the SBS-induced slow light and SSB modulation can be simultaneously achieved in the SBS process without using any optical filters. We apply the TTD line for an incoherent two-tap MPF for a proof-of-concept demonstration of our method
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