Fabrication-tolerant inverse-designed mode multiplexers on X-cut thin-film lithium niobate

2026-08-08

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Siyuan Zhou

Wenqu Su

Chunde Li

Yushan Liu

Guanyu Chen *

Hua Yu *

DOI：10.1016/j.optlastec.2026.116105

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Abstract

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• Ultracompact, fabrication-tolerant two-channel mode MUX on X-cut TFLN. • MFS-constrained topological inverse design enabling manufacturable device features. • Anisotropic re-evaluation revealing scalability limits of four-channel mode MUXs. • Five-channel wavelength deMUX demonstrating hybrid mode- and wavelength-division multiplexing.

Keywords:

Integrated optics

X-cut thin-film lithium niobate

Inverse design

Mode multiplexer

Wavelength demultiplexer

Fabrication-tolerant inverse-designed mode multiplexers on X-cut thin-film lithium niobate

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