In:
Journal of the Optical Society of America B, Optica Publishing Group, Vol. 40, No. 3 ( 2023-03-01), p. 502-
Kurzfassung:
The multimode power splitter plays an essential role in on-chip mode-division multiplexing systems. In this work, a broadband dual-mode optical power splitter based on the self-imaging effect in the multimode interference (MMI) engineered by bricked subwavelength gratings (BSWGs) is proposed. The dual-mode power splitter is optimized by combining the 3D finite difference time domain (FDTD) and the particle swarm optimization (PSO) method. For the input T E 0 mode, the insertion loss (IL) and the imbalance (IB) are lower than 0.55 dB and 0.65 dB, while the IL and IB for the input T E 1 mode are, respectively, lower than 0.7 dB and 0.37 dB over 150 nm bandwidth in the wavelength range of 1.5–1.65 µm. In addition, the cross talk (CT) is lower than − 25 d B for the two modes over this wavelength range. Furthermore, the minimum feature size of the gratings is as large as 135 nm, and only a single etch step is required, which is beneficial for the fabrication.
Materialart:
Online-Ressource
ISSN:
0740-3224
,
1520-8540
DOI:
10.1364/JOSAB.482899
Sprache:
Englisch
Verlag:
Optica Publishing Group
Publikationsdatum:
2023
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