Ring Resonator Optical Switch for Low Loss and Compact Footprint
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Solution Overview
Problem
Conventional optical switches based on a Mach-Zehnder interferometer suffer from high insertion loss, low extinction ratio, and an excessively large footprint, making them unsuitable for certain applications.
Innovation Solution
A structure for an optical switch comprising a first and second waveguide core, a ring resonator adjacent to the waveguide cores, and an optical coupler coupled to the waveguide cores, with specific gap configurations and phase shifters to optimize light coupling and switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a Mach-Zehnder interferometer is used as a base device for an optical switch, then the switching function can be achieved, but the insertion loss becomes high and the footprint becomes excessively large
Solution Approach 1:
The patent merges the Mach-Zehnder interferometer arms with a ring resonator structure, where the ring resonator is integrated into one of the interferometer arms. This combination allows the ring resonator to provide both resonance filtering and interference functionality, reducing the overall device footprint while maintaining the switching function. The merged structure eliminates the need for separate components, thereby reducing insertion loss and device area.
Solution Approach 2:
The ring resonator is nested within the Mach-Zehnder interferometer structure, with the resonator loop embedded in one of the interferometer arms. This nesting allows the resonator to occupy the space within the interferometer arm rather than requiring additional external space, effectively reducing the overall device footprint while maintaining the switching functionality.
2Reliability
If a Mach-Zehnder interferometer is used as a base device for an optical switch, then the switching function can be achieved, but the extinction ratio becomes low
Solution Approach 1:
The patent introduces a ring resonator with specific local properties (resonance frequency, coupling strength) that are optimized to enhance the extinction ratio. The resonator is designed with particular gap dimensions and coupling coefficients that create strong resonant coupling, thereby improving the contrast between switched states. This local optimization of the resonator properties enhances the overall switching performance without requiring a complete redesign of the interferometer structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed optical switch achieves reduced insertion loss, improved extinction ratio, and a more compact footprint compared to conventional designs, making it suitable for advanced photonic applications.
Implementation Method 1
The first portion of the ring resonator is spaced from the first portion of the first waveguide core by a first gap over a first light coupling region, and the second portion of the ring resonator is spaced from the first portion of the second waveguide core by a second gap over a second light coupling region
Implementation Method 2
An optical coupler splits input light between a pair of arms of the Mach-Zehnder interferometer... The arms converge at a downstream optical coupler at which the light is combined
Data Source
AI summary
Structures for an optical switch and methods of forming such structures. The structure comprises a first waveguide core including a first portion and a second portion, a second waveguide core including a first portion and a second portion, a ring resonator having a first portion adjacent to the first portion of the first waveguide core and a second portion adjacent to the first portion of the second waveguide core, and an optical coupler coupled to the second portion of first waveguide core and the second portion of the second waveguide core. The first portion of the ring resonator is spaced from the first portion of the first waveguide core by a first gap over a first light coupling region, and the second portion of the ring resonator is spaced from the first portion of the second waveguide core by a second gap over a second light coupling region.