We report on a new, to the best of our knowledge, technique enabling mitigation of the supermode noise (and timing jitter) in a soliton harmonically mode-locked (HML) fiber laser built on the nonlinear polarization evolution (NPE). An optical injection of an external continuous wave (CW) into the HML laser cavity results in an increase of the supermode noise suppression level (SSL) by a twothree order of magnitude for harmonics between 25th and 135th. The operation mechanism involves phaselocking between the injected light and soliton pulses and exhibits strong resonant dependence on the CW laser wavelength. Our findings offer important insights into the HML laser dynamics associated with an interaction between solitons and CW background in the laser cavity.
Bibliographical noteFunding Information:
Funding. Russian Science Foundation (19-72-10037); Ministry of Science and Higher Education of the Russian Federation (075-15-2021-581).