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Abstract
We present an erbium-doped all-fiber comb that is realized via intracavity piezoelectric mechanical responses by inserting an electrical polarization controller (EPC) for carrier envelope phase offset (${f_{\text{ceo}}}$) control and sticking a piezoelectric transducer (PZT) for repetition rate (${f_r})$ stabilization. With only three components inside the oscillator, it facilitates an all-fiber comb system with high integration and robustness. Besides ${f_{\text{ceo}}}$ control, smart, recoverable, and precise searching of mode-locked states can also be achieved by finely tuning the EPC driving voltages. The ${f_{\text{ceo}}}$ signal can be tightly phase-locked due to the 20 kHz 3 dB bandwidth of the EPC device. Compared with the traditional pump feedback mode, the EPC approach exhibits a larger and flatter gain in the near-zero-dispersion zone of the fiber comb, corresponding to less EPC induced intracavity fluctuations. It is also a benefit for reducing cross regulation between ${f_r}$ and ${f_{\text{ceo}}}$ in long-term stabilization of the comb.
© 2021 Optical Society of America
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