Transverse electric-pass polarizer based on composite waveguide

Abstract

The invention discloses a transverse electric-pass polarizer based on composite waveguides. The polarizer comprises an incident silicon waveguide, an emitted silicon waveguide, and a middle coupling portion between the incident silicon waveguide and the emitted silicon waveguide. The middle coupling portion is of a five-layer waveguide structure arranged on an SOI substrate, the five-layer waveguide structure sequentially including, from bottom to top, a lower silicon layer, a lower silicon dioxide layer, an upper silicon layer, an upper silicon dioxide layer and a metal chromium layer. When a TM mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TM mold is coupled from the lower silicon dioxide layer to the upper silicon dioxide layer and is absorbed for attenuation by the metal chromium layer. When a TE mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TE mold is transmitted along the lower silicon dioxide layer and will not be coupled to the upper silicon dioxide layer. The polarizer has the advantages of small size, high extinction ratio and low insert loss, enables coupling loss to be reduced, and facilitates optical integration.

Description

technical field [0001] The invention relates to the technical field of optoelectronics, in particular to a polarizer based on a composite waveguide through which a transverse electric field passes. Background technique [0002] With the introduction of long-distance all-optical networks, optical communication systems are becoming more and more complex. The high sensitivity of silicon-based components to the polarization of incident light has attracted people to design efficient and compact polarization control components, including polarizers, polarization beam splitters, and polarization rotators. In these polarization-controlling components, polarizers can be used to suppress the passage of unwanted polarization states and thus play an integral part in solving the polarization-dependent problems of many optical systems. [0003] For on-chip applications, polarizers must achieve ultra-small packages, high extinction ratios, and low losses. Many TE-pass and transverse magn...

AI Technical Summary

Problems solved by technology

Polarizers based on hybrid plasmonic waveguides can reduce the device length, but the presence of metals will bring additional transmission loss, and in order to reduce the transmission loss of its devices, the extinction ratio will also be affected

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