title: Toward athermal silicon-on-insulator (de)multiplexers in the O-band.
abstract: We report on the design, fabrication, and characterization of a 1×4 silicon-on-insulator (SOI) demultiplexer exhibiting a significant reduction of its thermo-optical sensitivity in the O-band. The optical filtering is achieved by cascading several Mach-Zehnder interferometers (MZIs) fabricated on a 300-nm-thick SOI platform. Owing to an asymmetric design of the confinement for each MZIs, we found an athermal criterium that satisfies the spectral requirements. The thermal sensitivity of the structure is analyzed by a semi-analytical model in order to create an athermal multiplexer. Fiber-to-fiber thermo-optical testing reveals a thermal sensitivity of around 17  pm/°C reduced by 75% compared to the standard devices with promising performances for both the crosstalk (15 dB), the insertion losses (4 dB), and absolute lambda registration (<0.25  nm).
authors.forename: Karim
authors.initials: K
authors.lastname: Hassan
authors.forename: Corrado
authors.initials: C
authors.lastname: Sciancalepore
authors.forename: Julie
authors.initials: J
authors.lastname: Harduin
authors.forename: Thomas
authors.initials: T
authors.lastname: Ferrotti
authors.forename: Sylvie
authors.initials: S
authors.lastname: Menezo
authors.forename: Badhise
authors.initials: B
authors.lastname: Ben Bakir