Opt Lett. 1997 Aug 01;22(15):1159-61. doi: 10.1364/ol.22.001159.
Optics letters
S Zhang, T Tamir
PMID: 18185781 DOI: 10.1364/ol.22.001159
Grating-assisted couplers can operate effectively over wavelength intervals that are considerably wider than expected. A scheme for achieving this purpose is presented.