Abstract

We theoretically show that a slightly modified Pound–Drever–Hall (PDH) stabilization scheme can lead to the optimum time-domain characteristics for electro-optic comb generators (EOCG). The ideal locking point is located by analyzing the EOCG output pulse width. By summing up the electrical field reflected by the EOCG front mirror, a model of the phase-locking error signal is derived with the Jacobi–Anger identical transformation. The simulation and experiment show that the zero-locking point of the error signal of the modified scheme coincides well with the ideal locking point in contrast with the direct application of the PDH scheme. Finally, a power efficiency of up to 2.9% is achieved with this EOCG stabilization scheme. A relative instability of better than ${2.6} \times {{10}^{- 8}}$ is demonstrated by a dual comb interferometer with fixed paths. The Allan deviations of the comb mode frequencies are smaller than ${2.8} \times {{10}^{- 9}}$ and ${1.1} \times {{10}^{- 10}}$ for average times of 1 and 100 s, respectively.

© 2020 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       The movie display optical spectrum of the unstabilized OFCG output. It is acquired by an Advantest Q8347 optical spectrum analyzer with a resolution of 0.9 GHz and a frequency span range of 200 GHz over a center frequency of 384.7796 THz.
» Visualization 2       The movie display optical spectrum of the stabilized OFCG output. It is acquired by an Advantest Q8347 optical spectrum analyzer with a resolution of 0.9 GHz and a frequency span range of 200 GHz over a center frequency of 384.7796 THz.

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