Full-duplex cylindrical vector beam multiplexing communication using spin-dependent phase modulation metasurfaces

• Published in: Optics express Vol. 31; no. 25; p. 42299
• Main Authors: Zeng, Qingji, Wang, Jing, Huang, Huihua, Wu, Haisheng, Ren, Jianjun, Nong, Lvye, Xie, Zhiqiang, Liu, Junmin, Ye, Huapeng, Fan, Dianyuan, Chen, Shuqing
• Format: Journal Article
• Language: English
• Published: United States 04.12.2023
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.501577

Cylindrical vector beam (CVB) has recently gained attention as a promising carrier for signal multiplexing owing to its mode orthogonality. However, the full-duplex multiplexing communication has not been previously explored for the lack of effective technologies to parallelly couple and separate CVB modes. Herein, we present a full-duplex solution for CVB multiplexing communication that utilizes spin-dependent phase modulation metasurfaces. By independently phase-modulating the two spin eigenstates of CVBs with the metasurface via spin-dependent orbital interactions, and loading two binary Dammann vortex gratings, we enabled an independent and reciprocal wave vector manipulation of CVBs for full-duplex (de)multiplexing operation. To demonstrate this concept, we constructed a 16-channel (including 4 CVB modes and 4 wavelengths) full-duplex CVB multiplexing communication system and achieved the bidirectional transmission of 800 Gbit/s quadrature-phase shift-keying (QPSK) signals over a 5 km few-mode fiber. Our results demonstrate the successful multiplexing and demultiplexing of 2 radial CVB modes and 2 azimuthal CVB modes in full-duplex communication with the bit-error-rates approaching 1.87 × 10 .