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Reducing phase errors in multimode interference coupler by side grooves formed on its top surface
Applied Optics
|September 14, 2023
Summary
This study introduces a novel method using rectangular grooves to reduce phase errors in multimode interference (MMI) couplers. This technique enhances the performance of MMI-based optical splitters, improving signal fidelity.
Area of Science:
- Photonics
- Optical Engineering
- Integrated Optics
Background:
- Multimode interference (MMI) couplers are essential optical devices.
- Their performance is often degraded by phase errors in spatial modes.
- These errors stem from deviations in mode propagation constants.
Purpose of the Study:
- To propose a simple and effective method for reducing phase errors in MMI couplers.
- To improve the performance of MMI-based optical splitters.
- To analyze the impact of groove dimensions on higher-order modes.
Main Methods:
- Forming rectangular grooves along the MMI coupler edges.
- Utilizing perturbation methods for analysis.
- Performing strict vector simulations for validation.
Main Results:
- Successfully reduced phase errors for higher-order spatial modes.
- Demonstrated improved performance in dual-mode MMI splitters (50:50 and 100:0).
- Validated the method for both medium- and high-index contrast materials (TiO2:SiO2/SiO2 and Si/SiO2).
Conclusions:
- The proposed groove-based method is effective in mitigating phase errors.
- This technique offers a practical approach to enhance MMI coupler performance.
- The findings are relevant for designing advanced optical splitters at 1.31 µm wavelength.
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