@article { weis2011OL, title = {Contradirectional couplers in silicon-on-insulator rib waveguides}, journal = {Optics Letters}, volume = {36}, year = {2011}, month = {09/2011}, pages = {3999 - 4001}, URL = {http://www.opticsinfobase.org/abstract.cfm?URI=ol-36-20-3999}, author = {Wei Shi and Xu Wang and Wen Zhang and Lukas Chrostowski and Nicolas A. F. Jaeger} }