Low Cost TWDM by Wavelength-Set Division Multiplexing. - Wolfgang Pöhlmann; Bernhard Deppisch; Thomas Pfeiffer 001; Carlo Ferrari; Mark P. Earnshaw; Alex Duque; Robert L. Farah; Joe Galaro; James Kotch; Man Fai Lau; Doutje T. van Veen; Peter Vetter (Bell Labs Tech. J., 2013)