Research on phase consistency control technology in multichannel optical fiber links

The new microwave photonic receiver system employs spatial light processing to enable multi-beam imaging within its field of view. This system uses fiber optic links for transmission, where the optical phase is sensitive to environmental disturbances, potentially affecting imaging quality. This paper aims to design and implement an efficient phase consistency control system for multi-channel optical fiber links. The system ensures the coherence of optical signals during transmission by precisely locking the phase in each channel's fiber optic link. Additionally, a serial digital-to-analog conversion scheme is proposed to address the pin count limitations of FPGA. Precise optical phase consistency control was achieved in single-channel experiments, and the serial digital-to-analog conversion scheme was validated on a 24- channel microwave photonic receiver, where stable image points were observed on the camera.