Computationally efficient simulation of multimode interference reflectors in the frequency domain

Jandu, George ORCID: https://orcid.org/0009-0006-0758-9817 and Smowton, Peter ORCID: https://orcid.org/0000-0002-9105-4842 2026. Computationally efficient simulation of multimode interference reflectors in the frequency domain. Presented at: The 26th European Conference on Integrated Optics, Cardiff, UK, 10-12 June 2025. Springer Nature, Item availability restricted.

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Abstract

The optimum design strategy for multimode interference reflectors is investigated by comparing the accuracy of and the time taken for several methods to address an exemplar, practical problem of optimising device length for a given wavelength in the O-band. Previously, three-part simulations based on the finite difference time domain method combined with either a fast uni-directional or bi-directional approach have been employed. Here we present a new formulation of an equivalent geometry approach based on the eigenmode expansion technique, and demonstrate that it can be used to find the optimum length to within 0.5 μm, over 130 times quicker than a typical GPU accelerated three-part approach. This suggests that the optimal strategy is to use the equivalent geometry approach to efficiently map the parameter space, and then an accurate three-part simulation to finalise the design.

Item Type:	Conference or Workshop Item (Paper)
Status:	In Press
Schools:	Schools > Physics and Astronomy
Publisher:	Springer Nature
Date of First Compliant Deposit:	7 January 2026
Date of Acceptance:	27 November 2025
Last Modified:	12 Jan 2026 11:15
URI:	https://orca.cardiff.ac.uk/id/eprint/183657

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