title: Dimensional variation tolerant mode converter/multiplexer fabricated in SOI technology for two-mode transmission at 1550  nm.
abstract: The use of an integrated asymmetrical directional coupler for two-mode transmission at 1550 nm is analyzed. The design is based on silicon-on-insulator (SOI) technology and permits mode conversion and mode multiplexing/demultiplexing. In the nominal design, mode conversion and mode (de)multiplexing are achieved with 97% efficiency and a 23.4 dB crosstalk level in the 1540-1560 nm band using a 0.1 μm gap. The dimension tolerance of the SOI process has been taken into account in the selection of the optimum design, and the coupling efficiency would remain above 82.3% (corresponding to 0.8 dB excess loss) with 3σ accuracy. A 90% efficiency has been experimentally obtained.
authors.forename: David
authors.initials: D
authors.lastname: Garcia-Rodriguez
authors.forename: Juan L
authors.initials: JL
authors.lastname: Corral
authors.forename: Amadeu
authors.initials: A
authors.lastname: Griol
authors.forename: Roberto
authors.initials: R
authors.lastname: Llorente