Crosstalk between two adjacent waveguides—
An important issue for photonic integration 

Surface Plasmon Polariton (SPP) can break through the diffraction limitation and displays promising way to achieve photonic integrated circuits (PICs). Also, it is widely believed that PICs based on SPP have great potential in the realization of optical interconnection. Generally, there will be a certain degree of coupling and crosstalk between two adjacent waveguides inevitably due to their modes overlap, and the crosstalk becomes stronger as the distance between the waveguides is reduced. For high dense photonic integration circuits, the component density is one of the most important points. It is therefore important to investigate the crosstalk between Plasmonic waveguides.

    The research group of Prof. Yang Yatao and Ma Junxian from Shenzhen University reviews the crosstalk research for plasmonic waveguides. SPP shows great potential in application of photonic integrated circuits and optical interconnection. In their research work of SPP waveguide and device used for photonic integrated circuits and optical interconnection, they found that crosstalk is a critical issue that has to be considered in practice. In some extent, crosstalk dominates the ultimate integration density of the planar photonic circuits. The group collected the relevant research work on crosstalk of plasmonic waveguides, and classified the data. The main crosstalk evaluation methods and crosstalk suppression methods have been presented. Specifically, three precise crosstalk evaluation methods had been introduced. Also, four specific approaches of reducing crosstalk have been illustrated as two categories according to their impacts on waveguide performances and the whole circuit. In the end, some extended methods had been put forward and discussed. The group hopes the review would provide useful references for readers carrying out research on PICs and optical interconnection.

Two parallel hybrid silicon plasmonic waveguides (HSPW) and their maximum transfer power 

About team
Center of Optical Internet of Things, Shenzhen University has been established in October 2017, which is affiliated to College of Information Engineering. The team is an innovative, interdisciplinary team that devotes to developing technologies and applications of fiber sensor and Internet of Things. Professor Yang Yatao and Ma Junxian are the leaders of the research center. The team is composed of ten faculties with broad specialty from optics to communication, microelectronics, materials, and identity algorithm. At present, the team focuses on the researches of brain information database and neurodegeneration, biological chips, smart city, and SPP waveguides and devices. Since established, the team has published more than 20 papers in SCI journals, and authorized 5 invention patents in China, also 3 software copyrights.

Ma J X, Zeng D Z, Yang Y T, Pan C, Zhang L et al. A review of crosstalk research for plasmonic waveguides. Opto-Electron Adv 2, 180022 (2019)