Abstract
We developed a multicarrier light source with a 50 GHz spacing using a 25-GHz-spacing comb generator and 50-GHz-spacing comb filter. The comb generator was composed of a dual-drive Mach–Zehnder (MZ) modulator with push–pull operation and a phase modulator (PM). The MZ modulator and PM were overdriven at 12.5 GHz and at a harmonic of 25 GHz, respectively. We produced 23 comb lines with a flatness below 1.7 dB, which were demultiplexed to produce 11 channel carriers. The relative intensity noise for each carrier was almost equal to that of the seed laser diode (LD). The crosstalk between neighboring channels was less than -35 dB. It was also confirmed that our comb generator is independent of the wavelength of the seed LD and can cover approximately one hundred channels of the entire C-band with eight seed LDs. Experiments on transmission over 100 km achieved a bit error rate of 10-12 for the 10 Gbps non-return-to-zero signal.
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