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Accurate Numerical Analysis of Multimode-Interference-Based 3-dB Couplers.

M Rajarajan, B M Rahman, K T Grattan

|February 21, 2008

Summary

This summary is machine-generated.

Accurate simulation of multimode interference 3-dB couplers is crucial for waveguide devices. Numerical methods, validated by experimental data, highlight the importance of 2D cross-section analysis for optical properties.

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Area of Science:

Optoelectronics
Computational Electromagnetics
Waveguide Optics

Background:

Multimode interference (MMI) couplers are fundamental components in photonic integrated circuits.
Accurate modeling of power coupling is essential for device performance optimization.

Purpose of the Study:

To analyze the power coupling characteristics of MMI-based 3-dB couplers.
To validate numerical simulation methods against experimental data.

Main Methods:

Vector finite-element method (VFEM).
Least-squares boundary residual (LSBR) method.
Comparison with published experimental data.

Main Results:

The VFEM and LSBR methods accurately predict the power coupling characteristics of MMI 3-dB couplers.
Numerical results show good agreement with experimental findings, demonstrating method versatility.
Full 2D cross-section treatment is critical for accurate simulation.

Conclusions:

The employed numerical schemes are accurate and versatile for analyzing MMI couplers.
Accurate simulation of optical properties, including polarization and fabrication tolerances, requires detailed 2D analysis.
These validated methods support the design and simulation of advanced waveguide devices.