120-degree optical mixer based on hybrid plasmon optical waveguide

Abstract

The invention discloses a 120-degree optical mixer based on a hybrid plasmon optical waveguide, which is composed on a singe 3*3 multi-mode interference coupler, wherein the 3*3 multi-mode interference coupler is provided with a multi-mode waveguide region and three input waveguides and three output waveguides of the multi-mode waveguide region, and the waveguide cross section structure perpendicular to the light propagation direction of the 3*3 multi-mode interference coupler is a hybrid plasmon waveguide structure; the hybrid plasmon waveguide structure includes a metal layer, a slit dielectric interlayer, a dielectric waveguide layer and a substrate layer which are sequentially designed in a laminated manner from top to bottom, the clearance between the metal layer, the slit dielectricinterlayer and the dielectric waveguide layer and the substrate layer forms an air cladding; both input light of the input waveguides and output light of the output waveguides are of a hybrid plasmonfundamental mode, the hybrid plasmon waveguide structure is used for exciting the input light of the hybrid plasmon fundamental mode to form multiple hybrid plasmon optical waveguide modes in the multi-mode waveguide region. The size of the mixer is reduced from the millimeter level to the micron level.

Description

technical field [0001] The invention belongs to the technical field of optical frequency mixing, in particular to a 120° optical mixer based on a hybrid plasmon optical waveguide. 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. In the realization scheme of the coherent optical receiver, the 120° phase difference receiver is a very promising scheme. Recently, it has been proven not only in the microwave band to be a broadband receiver resistant to hardware errors [Perez-Lara P, et al. Broadband Five-Port Direct Receiver Based on Low-Pass and High-Pass Phase Shifters. IEEE Transactions on Microwave Theory&Technique...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a 120° optical mixer based on a hybrid plasmon optical waveguide, which has a smaller order of magnitude, is conducive to the high integration of photonic devices, and solves the problems of the prior art The size of the medium mixer is too large, which is not conducive to the further integration of photonic devices; the specific technical solutions are as follows:

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