English: In this paper reflective SOAs are characterized for cost-efficient FTTH applications. The novel Nyquist WDM modulation format is investigated and implemented. An improvement of the bit error performance is achieved by a pre-distortion that compensates the bandwidth limitation of the reflective low-cost transmitter. The resulting modulation improves the BER and transmission speed. Furthermore, the format needs less signal processing compared to OFDM while reaching the same transmission rates.