Continuous ultra-wideband signal regeneration in random optoelectronic oscillators through injection locking

Abstract

By using an external injection locking method, for what we believe to be the first time, we experimentally demonstrate continuous ultra-wideband signal regeneration in random optoelectronic oscillators, achieving more adaptable signal processing capabilities than self-oscillation methods. Supported by theoretical analysis and experimental evidences, this system can regenerate any signal with sufficient gain in a random-feedback cavity, independent of cavity filters. Remarkably, enhanced phase noise performance with over 35.2 dB side mode suppression and a phase noise better than −86 dBc@1 kHz at higher injecting powers are demonstrated. Additionally, we successfully process complex multi-frequency communication signals, indicating potential applications in radar, remote sensing, and data communications.

Microwave Photonic Frequency Multiplier with Low Phase Noise Based on an Optoelectronic Oscillator

“…On the other hand, optoelectronic oscillators (OEOs) can be configured as self-starting microwave signal generators [26,27]. An OEO shows prominent performance in terms of high spectral purity and ultralow phase noise [28,29], which enables high-quality frequency multiplication signal generation.…”