Media type: E-Article Title: Planar optical coupling elements for multimode fibers with two-step ion migration process Contributor: Viljanen, J.; Leppihalme, M. Published: Springer Science and Business Media LLC, 1981 Published in: Applied Physics, 24 (1981) 1, Seite 61-63 Language: English DOI: 10.1007/bf00900399 ISSN: 0340-3793; 1432-0649 Keywords: General Engineering ; General Physics and Astronomy ; Physics and Astronomy (miscellaneous) ; General Engineering Origination: Footnote: