Abstract

For frequencies well below the relaxation frequency, the fundamental noise of a Fabry-Perot Q-dash mode-locked laser (FP-MLLD) frequency comb is well modeled by a frequency white noise. As a result, the comb modes shows a Lorentzian shape of widths ∆v_n which follow a parabolic law as a function of mode number n. The width of the narrowest mode ∆v_min results from the noise common to all comb modes. The line shape of the radio frequency (RF) beat note of all modes at the repetition rate F_rep is also a Lorentzian of width ΔF_rep that impacts the parabola concavity [1, 2].

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