Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation IEEE Photonics Technology Letters (IF2.468), Pub Date : 2021-09-29, DOI: 10.1109/lpt.2021.3116439 David González-Andrade, Raquel Fernández de Cabo, Jaime Vilas, Irene Olivares, Antonio Dias, José Manuel Luque-González, J. Gonzalo Wangüemert-Pérez, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, Robert Halir, Pavel Cheben, Aitor V. Velasco
On-chip mode converters and multiplexers are fundamental components to scale the capacity of silicon optical interconnects by using different spatial modes of waveguides. Recently, we proposed a low loss and compact mode converter and multiplexer consisting of a subwavelength-engineered multimode interference coupler, tapered waveguides as phase shifter and a symmetric Y-junction. However, the narrow spectral response of the tapered phase shifter limited the device crosstalk performance. In this work, we demonstrate that the use of a subwavelength grating phase shifter with low phase-shift errors substantially reduces the crosstalk and expands the operational bandwidth. A complete multiplexer-demultiplexer link consisting of two devices in back-to-back configuration was fabricated in a 220-nm silicon-on-insulator platform. Experimental measurements of the complete link show insertion loss below 2 dB and crosstalk less than −17 dB over a bandwidth of 245 nm (1427 – 1672 nm).