High-frequency Ηarmonic Mode Locking in a Frequency-Shifted Fiber Ring Laser With an Acousto-Optic Modulator

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Abstract

The possible development of a soliton ring laser with the hybrid harmonic mode locking that provides the generation of a multi-GHz pulse sequence in combination with a high level of supermode noise suppression and low time jitter, is demonstrated. The mode locking is based on the effect of intracavity frequency shift. The development is based on the assumption that, under certain conditions, an acousto-optic frequency shift, supplemented by the spectral filtration, can lead to stabilization and an increase in the quality of a high-frequency pulse sequence.

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About the authors

Pavel A. Itrin

Ulyanovsk State University

Author for correspondence.
Email: itrin@mail.ru
ORCID iD: 0000-0002-7198-0646

Junior Researcher, Post-graduate student, S. P. Kapitsa Nonlinear and Microwave Photonics Laboratory

Russian Federation, Ulyanovsk

Dmitry I. Sementsov

Ulyanovsk State University

Email: itrin@mail.ru
ORCID iD: 0000-0001-6760-0156

Dr. of Sciences (Phyth.&Math.), Professor, S. P. Kapitsa Nonlinear and Microwave Photonics Laboratory

Russian Federation, Ulyanovsk

Andrey B. Petrov

Nordlase Ltd.

Email: a.petrov@nordlase.ru
ORCID iD: 0000-0001-9219-1040

Cand. of Sciences (Engin.), engineer

Russian Federation, Saint-Petersburg

Mikhail S. Kozlyakov

Nordlase Ltd.

Email: m.kozliakov@nordlase.ru
ORCID iD: 0000-0003-2616-4532

engineer

Russian Federation, Saint-Petersburg

Valeria A. Ribenek

Ulyanovsk State University

Email: itrin@mail.ru
ORCID iD: 0000-0002-9233-5339

Junior Researcher, Post-graduate student, S. P. Kapitsa Nonlinear and Microwave Photonics Laboratory

Russian Federation, Ulyanovsk

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Supplementary files

Supplementary Files
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1. JATS XML
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2. Fig. 1. Layout of a fiber laser with harmonic mode locking: PC – polarization controller, FS – acousto-optic modulator in the frequency shift mode, TBPF – tunable filter, OC – output coupler

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3. Fig. 2. Optical spectra of generated pulse sequences depending on the transmission region of the tunable filter. The spectra are shown for the given maximum repetition rates obtained in each transmission band: 1 – 9 GHz; 2 – 11 GHz; 3 – 4.5 GHz, 4 – 6.5 GHz; 5 – 1.6 GHz; 6 – 4.7 GHz; 7 – 0.7 GHz; 8 – 13 GHz; 9 – 12 GHz

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4. Fig. 3. Output power and pulse repetition rate depending on the pumping power at the central transmission wavelength of the filter λ0 = 1 533.7 nm

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5. Fig. 4. Optical spectra of pulse sequences at different repetition rates for the central transmission wavelengths of the filter λ0 = 1532.7 nm and λ0 = 1533.7 nm

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6. Fig. 5. Specifications of the radio frequency spectrum of pulse sequences obtained at the central transmission wavelength of the filter λ0 = 1532.7 nm: a) RF spectrum of the sequence with a repetition rate of 4.49 GHz (resolution – 1 kHz); b) RF spectrum with 30 Hz resolution

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7. Fig. 6. Changes in the signal-to-noise ratio (red triangles) and supermode noise suppression the level (black rhombuses) at various repetition rates

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8. Fig. 7. Oscillograms (left) and RF spectra (right) of pulse sequences with the repetition rates of 8.95 GHz, 11.97 GHz and 13.01 GHz at the central filter transmission wavelength λ0 = 1529 nm, 1546.5 nm and 1545.5 nm (from bottom to top), respectively

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Copyright (c) 2023 Itrin P.A., Sementsov D.I., Petrov A.B., Kozlyakov M.S., Ribenek V.A.

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