Wideband Four-channel Channelizer with High Interference Suppression

Future communication network architectures will increasingly rely on developing and utilizing high-frequency resources, and processing ultra-high frequency broadband RF signals remains challenging. The channelization technology emerges as an essential solution, enabling refined spectral segmentation processing. However, with the advancement in photonic integration technology, there is an increasing preference for lightweight and miniaturized payloads, especially in the field of satellite communication and radar. This work has experimentally demonstrated a polarization multiplexing-based microwave photonic four-channel reception scheme for channelization. The structure, characterized by its simplicity and compactness, and devoid of optical filters, effectively reduces the receiver's bandwidth requirement to one-fourth of the original signal bandwidth. The channelizer effectively slices four 8 GBaud QPSK signals, ensuring wideband isolation exceeds 20 dB, and outputs them parallel to four channels. Furthermore, the RF signals ranging from 8 to 40 GHz achieve an inter-channel interference rejection ratio of more than 42 dB.