90-degree optical mixer based on silicon-based silicon nitride waveguide

Abstract

The invention provides a 90-degree optical mixer based on a silicon-based silicon nitride waveguide. The 90-degree optical mixer comprises a substrate; the silicon dioxide layer is positioned on the substrate; the silicon nitride waveguide layer is located on the silicon dioxide layer; the silicon dioxide coating layer is coated on the silicon nitride waveguide layer; wherein the silicon nitride waveguide layer is configured to comprise a signal light input waveguide, a local oscillation light input waveguide, a multimode interference region and four output waveguides; the signal light input waveguide is coupled with the multi-mode interference area and used for receiving signal light, and the multi-mode interference area excites each order of mode, so that the signal light and the local oscillation light are subjected to frequency mixing to form four copy points of an input light field, and the four copy points are respectively led out to the four output waveguides. Based on the silicon-based silicon nitride waveguide and the multimode interference coupler, the 2 * 4 type 90-degree optical mixer with low loss, low phase deviation and high optical bandwidth is realized.

Description

technical field [0001] The invention belongs to the field of optical communication, in particular to a 90-degree optical mixer based on a silicon-based silicon nitride waveguide. Background technique [0002] With the maturity of 1.55μm band optical communication system technology and the limitation of standard single-mode fiber (SMF) capacity, finding more bands has become a research hotspot for next-generation high-capacity optical networks. Compared with conventional solid fibers, hollow photonic bandgap fibers (HC-PBGFs) are very promising due to their ultra-low nonlinearity and lower latency. Recently, 2μm-band WDM optical communication systems based on HC-PBGF fibers have been shown to have broad application prospects. At the same time, some key components have been developed in the 2μm band, including high-speed modulators and photodetectors, which provide the possibility of integration in this band, making transmission experiments in the 2μm band feasible. [0003]...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a 90-degree optical mixer based on silicon nitride waveguides, which is used to solve the problem of large mixer size, high loss and phase loss in the prior art. big deviation problem

Images