A compact photonic structure based on microring cavity to realize multiple resonance line shapes

Abstract

The invention relates to a compact photon structure capable of realizing various resonance line types based on a micro ring cavity. The compact photon structure comprises a straight waveguide (1), a micro ring cavity (2) and a substrate (4), and is characterized in that the straight waveguide (1) and a micro ring cavity (2) are located on the substrate (4), and a gap is reserved between the straight waveguide (1) and the micro ring cavity (2); the straight waveguide (1) is provided with two air holes; and the straight waveguide (1) and the micro ring cavity (2) are equal in thickness d and width w, and the straight waveguide (1) and the micro ring cavity mutually adopt lateral coupling. The beneficial effects comprise that the photon structure is compact, not only can realize various resonance line types at a specific resonant wavelength of a transmission spectrum of a waveguide-micro ring cavity coupling structure, but also has the characteristic at multiple resonant wavelengths in a wide band range, and can meet the demand of realizing various applications by using the single micro ring cavity.

Description

technical field [0001] The invention belongs to the field of optoelectronic integrated chips, and in particular relates to a compact photonic structure capable of realizing multiple resonance line shapes based on a micro-ring cavity on a photonic chip. Background technique [0002] A microring cavity is a typical optical cavity. With very compact structure size, high quality factor and extinction ratio, it is one of the important photonic devices constituting optoelectronic integrated chips. Through integration with other active or passive devices, microring cavities have been widely used in on-chip optical interconnects, optical sensor chips, and other fields. [0003] On the photonic chip, the function of the micro-ring cavity generally needs to be coupled with a channel waveguide side, that is, a waveguide-micro-ring cavity coupling structure is formed, so that the resonant optical field signal in the micro-ring cavity can be measured. After the light is coupled into th...

AI Technical Summary

Problems solved by technology

The Mach-Zehnder interference structure adds a straight waveguide on the basis of the waveguide-micro-ring cavity coupling structure, and needs to keep a certain distance from the original waveguide, so it is not compact enough

The Bragg grating reflective structure is a grating structure carved on a straight waveguide or a micro-ring cavity. Although it meets the compactness requirements, it has high requirements for processing technology and is only for a single wavelength.

[0005] In addition, by cascading multiple microring cavities, a transparent window similar to the phenomenon of electromagnetically induced transparency can be generated on the transmission spectrum of the waveguide-microring cavity coupling structure, that is, the transmission spectrum shows a peak rather than a depression at the resonance wavelength. , can be used for special purposes such as optical delay lines, but it also has the problem of not being compact enough, and it is a huge challenge to accurately control the resonance wavelength of multiple microring cavities at the same time

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