2*2 optical waveguide switch based on phase change material and preparation method thereof

Abstract

The invention discloses a phase change material-based 2 * 2 optical waveguide switch and a preparation method thereof. A 2 * 2 optical switch unit waveguide structure is arranged on a substrate, two waveguides are distributed in an axial symmetry mode and comprise two input ports and two output ports, and a coupling area is arranged between the two waveguides; and a uniform hundred-nanoscale Ge2Sb2Se4Te1 thin film consistent with the components of the target material is prepared in a coupling region by adopting a pulse laser deposition method. The switch unit is controlled by the phase change material covering the waveguide in the coupling area, the phase state of the phase change material is switched to complete the functions of dual-channel selection input, dual-channel gating and mode switching for the transverse electric fundamental mode, and the function of same-side port input and same-side port output for the transverse magnetic fundamental mode is met. The invention has the characteristics of high extinction ratio, small size and high switching speed.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and in particular relates to a 2×2 optical waveguide switch based on a phase change material and a preparation method thereof. Background technique [0002] With the development of technologies such as virtual reality, augmented display, cloud computing, big data, and artificial intelligence, higher requirements are placed on communication capacity, and finding new multiplexing technologies has become a new research hotspot in the field of optical communication. The use of spatial dimension as a new resource for information bearing has brought new changes to network technology. The multiplexing of spatial dimension increases the physical dimension and information capacity of communication networks. It is a multiplexing technology that needs to be developed and utilized urgently. Spatial mode multiplexing, referred to as "mode division multiplexing", is a kind of spatial dimension multiple...

AI Technical Summary

Problems solved by technology

At present, many common 2×2 optical switches are mechanical, which have large volume, large insertion loss, and unstable optical path switching.

Although the common 2×2 optical switch based on phase-change materials solves these problems, its coupling region is designed based on three-waveguide coupling (see literature: Zhang Q , ZhangY , Li J , et al. Broadband nonvolatile photonic switching based on optical phase change materials: beyond the classical figure-of-merit[J]. OpticsLetters, 2018, 43(1):94.), the phase change material covers the intermediate waveguide, which increases the Experiment difficulty

Also, because the input port of this type of optical switching device currently being studied basically only supports the input of a single transverse electric fundamental mode (TE0) or transverse magnetic fundamental mode (TM0), the mixed mode input of TE0 and TM0 cannot form a switching effect , limiting the application of such switches

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