Resonant Interferometric Coupler for Selective Spectral Field Control
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Solution Overview
Problem
Existing photonic chips lack the ability to selectively enhance or suppress optical field within a specific spectral range, limiting the control over field enhancement or suppression to a given spectral range.
Innovation Solution
A resonant interferometric coupler is designed with a bus waveguide and multiple resonators, including a first and second resonator, where a phase shift is imparted by the second resonator to cause interference at the second evanescent coupling point, allowing for selective control of field enhancement or suppression over a specific spectral range through a tuning mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a Mach-Zehnder interferometer is used to enhance or suppress electromagnetic field, then field enhancement or suppression is achieved, but the spectral range is not limited to a specific range
Solution Approach 1:
The device segments the optical path into multiple resonant cavities (first and second resonant cavities) with different resonant frequencies, allowing independent control of field enhancement at different spectral ranges. Each cavity acts as an independent filter that can be tuned to specific wavelengths, enabling spectral selectivity while maintaining field enhancement capability.
Solution Approach 2:
Different sections of the interferometer are assigned different resonant properties through the use of resonant cavities with distinct resonant frequencies. The first resonant cavity is optimized for one spectral range while the second resonant cavity targets another spectral range, allowing localized field enhancement at specific wavelengths rather than across the entire spectrum.
2Adaptability or versatility
If a ring resonator is used as a band-pass filter to limit field enhancement to a resonant spectral range, then spectral selectivity is improved, but the spectral range becomes too narrow for some applications
Solution Approach 1:
The patent combines multiple ring resonators (first and second resonant cavities) with different resonant frequencies into a single interferometric structure. This merging allows the device to provide field enhancement across multiple spectral ranges simultaneously, effectively broadening the overall spectral response while maintaining the spectral selectivity of individual resonators. The constructive interference of multiple resonant modes enables enhanced field magnitude across a wider spectral bandwidth.
3Adaptability or versatility
If multiple resonators are used to broaden spectral response, then spectral range is improved, but device complexity increases
Solution Approach 1:
The interferometric structure serves multiple functions simultaneously: it acts as a beam splitter, combines multiple resonant cavities, and functions as an interferometer for constructive interference. This multi-functionality reduces the need for additional separate components, thereby limiting device complexity growth despite the inclusion of multiple resonators. The same structural elements perform multiple roles in achieving both spectral broadening and field enhancement.
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 coupler enables precise control over the quality factor and spectral position of resonances, enhancing or suppressing optical field as needed, and provides dynamic tunability and scalability, reducing thermal cross-talk and improving nonlinear process control.
Implementation Method 1
optical power ranging within a resonant spectral range of the ring resonator is allowed to build up over multiple round trips due to constructive interference and total internal reflection occurring within the ring resonator
Implementation Method 2
optical power ranging within a resonant spectral range of the ring resonator is allowed to build up over multiple round trips due to constructive interference and total internal reflection occurring within the ring resonator
Implementation Method 3
a first resonator evanescently coupled with an input section of the bus waveguide at a first coupling point
Implementation Method 4
The second resonator has a second resonance overlapping with at least one of the first resonances and across which a phase shift is imparted
Implementation Method 5
The phase shift imparted by the second resonator can cause interference at the second evanescent coupling point where the first and second arm paths are recombined
Data Source
AI summary
There is described a resonant interferometric coupler generally having: a substrate; a bus waveguide having in serial connection an input section, a bent section and an output section; a first resonator having a first evanescent coupling point with the input section and a second evanescent coupling point with the output section, the first resonator having first resonances; an interferometer having a first arm path extending along the bent section between the first and second evanescent coupling points, and a second arm path extending along the first resonator between the first and second evanescent coupling points; and a second resonator having a third evanescent coupling point with the bent section, the second resonator having a second resonance overlapping with one of the first resonances and across which a first phase shift is imparted, thereby causing interference at the second evanescent coupling point.