期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 41, 期 7, 页码 2070-2078出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3217976
关键词
Couplers; Stars; Multiplexing; Optical fiber polarization; Optical fiber couplers; Crosstalk; Optical fiber devices; Orbital angular momentum; photonic integrated circuits; silicon photonics; space division multiplexing; wavelength-division multiplexing
In this research, an optical phased array (OPA) with two-dimensional antennas is used to generate circularly polarized OAM beams. The OAM multiplexer supports up to 46 simultaneous spatial modes and incorporates intensity tuning capability to improve the OAM quality and reduce crosstalk.
Orbital angular momentum (OAM) modes have low model interactions during fiber propagation at data center distances, and thus are suitable for ultra-high capacity systems at low digital signal processing. Generating OAM modes using free-space setups is useful for proof-of-concept experiments, but is not a scalable solution. We use an optical phased array (OPA) with two-dimensional antennas for on-chip circularly polarized OAM beam generation. Our previous work demonstrated an OAM multiplexer for lower-order modes. In this work, we demonstrate an OAM multiplexer that supports a record of 46 (23 per polarization) simultaneous spatial modes up to OAM order 11. We also improve the crosstalk performance of our multiplexer. We incorporate an intensity tuning capability that substantially improves the OAM quality by enabling a uniform power distribution across the antennas. The worst-case crosstalk for the supported OAM5 to OAM11 are found experimentally to be better than $-12$ dB, with OAM10 achieving -17.2 dB.
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