Borel, Peter Ingo1; Frandsen, Lars Hagedorn1; Harpøth, Anders1; Kristensen, Martin4; Jensen, Jakob Søndergaard5; Sigmund, Ole3
1 Department of Photonics Engineering, Technical University of Denmark2 Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark3 Department of Mechanical Engineering, Technical University of Denmark4 Department of Micro- and Nanotechnology, Technical University of Denmark5 Department of Electrical Engineering, Technical University of Denmark
A planar photonic crystal waveguide Y-splitter that exhibits large-bandwidth low-loss 3 dB splitting for TE-polarised light has been fabricated in silicon-on-insulator material. The high performance is achieved by utilising topology optimisation to design the Y-junction and by using topology optimised low-loss 60° bends. The average excess loss of the entire component is found to be 0.44±0.29 dB for a 100 nm bandwidth, and the excess loss due to the Y-junction is found to be 0.34±0.30 dB in a 175 nm bandwidth.
Electronics Letters, 2005, Vol 41, Issue 2, p. 69-71