Abstract
We report the first use of the CW-seeded parametric comb as a multiwavelength source for coherent
channel transmitters. The new comb source relies on a multistage parametric mixer design seeded by a single
kilohertz-linewidth master laser. The resultant frequency comb provides more than 120 tones in a 100-nm-wide
continuous band, all possessing kilohertz-scale linewidth inherited from the master laser. The applicability of the
new comb source as a coherent channel carrier was quantified by error-vector magnitude and bit-error rate metrics of
individual spectral lines modulated by QPSK signaling. The performance of the new source exceeded that of the standard
tunable coherent transmitter while providing a qualitatively lower frequency uncertainty and drift.
© 2013 IEEE
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