Phase-stable transmission of broadband signals based on an MPPD-enabled optoelectronic phase-locked loop

A phase-stabilized transmission scheme for wideband RF signals over fiber links is proposed and experimentally demonstrated. By utilizing a wideband microwave photonic phase detector (MPPD) and an optoelectronic phase-locked loop (OEPLL), real-time compensation of fiber-induced delay jitter for broadband modulated signals is achieved, which overcomes the fundamental single-frequency limitation inherent in traditional MPPD-based systems. A proof-of-concept experiment is built over a 2-km fiber link. For a 100-MHz-bandwidth linear frequency-modulated (LFM) signal, the system realizes 34-dB phase noise suppression at 10-Hz offset and an Allan variance of 2.99 × 10^-13 at 100-s averaging time. It also supports phase-stabilized transmission of an 11-bit Barker code without any hardware reconfiguration, demonstrating outstanding advantages including wide format adaptability, ultra-high phase stability, and strong environmental robustness for high-fidelity wideband signal distribution.