Performance Analysis of SiGe-Cladded Silicon MMI Coupler in Presence of Stress

In this study, we demonstrate the influence of operating temperature variation and stress-induced effects on a silicon-on-insulator (SOI)-based multi-mode interference coupler (MMI). Here, SiGe is introduced as the cladding layer to analyze its effect on the optical performance of the MMI coupler. S...

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Bibliographic Details
Published in:Computation 2023-02, Vol.11 (2), p.34
Main Authors: Kumari, Sneha, Pathak, Akhilesh Kumar, Gangwar, Rahul Kumar, Gupta, Sumanta
Format: Article
Language:English
Subjects:
Bandwidths
Birefringence
Cladding
coupler
Couplers
Design
Design and construction
Finite element method
Geometry
Integrated circuits
interference
Mathematical analysis
Misfit dislocations
Operating temperature
Parameter modification
Photonics
Propagation
Rectangular waveguides
Silicon
Silicon germanides
Silicon-on-isolator
stress
temperature
Thickness
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Summary:In this study, we demonstrate the influence of operating temperature variation and stress-induced effects on a silicon-on-insulator (SOI)-based multi-mode interference coupler (MMI). Here, SiGe is introduced as the cladding layer to analyze its effect on the optical performance of the MMI coupler. SiGe cladding thickness is varied from 5 nm to 40 nm. Characterization of the MMI coupler for ridge waveguides with both rectangular and trapezoidal sidewall slope angle cross-sections is reviewed in terms of power splitting ratio and birefringence. Stress-induced birefringence as a function of operating temperature and cladding thickness for fundamental mode have been calculated. A trapezoidal waveguide with 40 nm of cladding thickness induces more stress and, therefore, affects birefringence more than a rectangular waveguide of any thickness. Simulation results using the finite element method (FEM) confirmed that operating temperature variation, upper cladding thickness, and its stress effect are significant parameters that drastically modify the performance of an MMI coupler.
ISSN:2079-3197
2079-3197
DOI:10.3390/computation11020034