Abstract
A novel scheme to generate coherent and frequency-lock optical subcarriers
is proposed and experimentally demonstrated. 53 subcarriers with 12.5 GHz
spacing and less than 10 dB power fluctuation are generated by cascading two
stages of phase modulators, which are driven by 25 and 12.5 GHz clock sources
at different modulation depths, respectively. The modulation index and phase
difference of two stage phase modulation are theoretically and experimentally
investigated. The flattening spectrum of the optical subcarriers is achieved
by optimizing the clock phase relationship among the RF driving sources at
both stages.
© 2012 IEEE
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