90-degree optical mixer based on hybrid plasmon waveguide structure

Abstract

The invention discloses a 90-degree optical mixer based on a hybrid plasmon waveguide structure. The 90-degree optical mixer is composed of a single 4*4 multimode interference coupler (MMI). The hybrid plasmon waveguide structure consists of a dielectric waveguide layer, a slit dielectric interlayer on the dielectric waveguide layer, and a metal layer on the slit dielectric interlayer. When lightenters the hybrid plasmon waveguide, the special structure of the hybrid plasmon waveguide can excite a hybrid plasmon mode and confines the mode in the slit dielectric interlayer so that the propagation distance under the same optical path can be greatly reduced and thus the size of the device is greatly reduced. Thus, compared with a conventional dielectric waveguide mixer, the 90-degree opticalmixer is reduced in size from millimeters to micrometers, provides a new structural solution for highly integrated photonic devices and has far-reaching effects on the further integration of photonicdevices.

Description

technical field [0001] The invention relates to optical frequency mixing technology, in particular to a 90° optical mixer based on a hybrid plasmon waveguide structure. Background technique [0002] Coherent optical communication is an important modern communication method, and the coherent optical receiver is the most important device of the coherent optical communication system. In the coherent optical receiver, the received coherent optical signal is mixed with the optical signal generated by the local oscillator and then output to the photodiode for differential processing. Among them, the optical mixer is one of the most important components of the coherent optical receiver. At present, the main choice for integrated optical mixers is the multimode interference coupler (MMI). The structure of traditional optical mixers usually consists of a 4×4MMI or four 2×2MMIs, but traditional MMIs are Based on the dielectric optical waveguide, the device size is on the order of hu...

AI Technical Summary

Problems solved by technology

At present, the main choice for integrated optical mixers is the multimode interference coupler (MMI). The structure of traditional optical mixers usually consists of a 4×4MMI or four 2×2MMIs, but traditional MMIs are Based on the dielectric optical waveguide, the device size is on the order of hundreds of microns, and it is not easy to further improve the integration of the chip

Images