Interferometric nulling of four channels with integrated optics Errmann, Ronny ; Minardi, Stefano ; Labadie, Lucas ; Muthusubramanian, Balaji ; Dreisow, Felix ; Nolte, Stefan ; Pertsch, Thomas Abstract Publication: Applied Optics Pub Date: August 2015 DOI: 10.1364/AO.54.007449 Bibcode: 2015ApOpt..54.7449E