Single-mode semiconductor optical waveguides with large dimensions suitable for compact bend applications - Deri, R. J.; Shahar, A.; Colas, E.; Thurston, R. N.; Tomlinson, W. J.; Yi-Yan, A.; Seto, M. (American Institute of Physics (AIP), 1990)
http://dx.doi.org/10.1063/1.104112
Keywords: U