All-fiber 6-mode multiplexers based on fiber mode selective couplers Chang, Sun Hyok ; Moon, Sang-Rok ; Chen, Haoshuo ; Ryf, Roland ; Fontaine, Nicolas K. ; Park, Kyung Jun ; Kim, Kwangjoon ; Lee, Joon Ki Abstract Publication: Optics Express Pub Date: March 2017 DOI: 10.1364/OE.25.005734 Bibcode: 2017OExpr..25.5734C