Design of Compact Arbitrary-Ratio Multimode Power Splitters Based on Topological Derivative

• Autor(a) principal: Pita Ruiz, Julian L.
• Data de Publicação: 2020
• Outros Autores: Aldaya, Ivan [UNESP], Dainese, Paulo, Gabrielli, Lucas H.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1109/LPT.2020.3016012; http://hdl.handle.net/11449/208975
• topic: Optimization; Couplings; Silicon; Performance evaluation; Bandwidth; Fabrication; Insertion loss; Silicon photonics; integrated optics; mode division multiplexing

Compact unbalanced splitters are a key constitutive block to achieve flexibility in future multimode applications relying on silicon-on-insulator technology. Their design, however, poses significant challenges as it has to combine high performance for the different supported modes, a compact size, and compliance with fabrication constraints. In this letter, we employ topological derivative to optimize the design of bimodal unbalanced splitters with predefined split ratios of 2:1 and 3:1. Numerical simulations reveal that the optimized devices achieve the desired ratios with insertion losses of 0.6 dB and 0.5 dB, and crosstalks of -18.2 dB and -16.4 dB, both in a compact footprint of 4.2 mu m x 3.5 mu m.