Abstract
We propose a passively mode-locked fiber optical parametric oscillator assisted with optical time-stretch. Thanks to the lately developed optical time-stretch technique, the onset oscillating spectral components can be temporally dispersed across the pump envelope and further compete for the parametric gain with the other parts of onset oscillating sidebands within the pump envelope. By matching the amount of dispersion in optical time-stretch with the pulse width of the quasi-CW pump and oscillating one of the parametric sidebands inside the fiber cavity, we numerically show that the fiber parametric oscillator can be operated in a single pulse regime. By varying the amount of the intracavity dispersion, we further verify that the origin of this single pulse mode-locking regime is due to the optical pulse stretching and compression.
Highlights
Parametric amplification in optical fibers is a nonlinear process which converts a strong pump laser into a small signal [1]
We propose a passively mode-locked fiber optical parametric oscillator assisted with optical time-stretch
By matching the amount of dispersion in optical time-stretch with the pulse width of the quasi-CW pump and oscillating one of the parametric sidebands inside the fiber cavity, we numerically show that the fiber parametric oscillator can be operated in a single pulse regime
Summary
Parametric amplification in optical fibers is a nonlinear process which converts a strong pump laser into a small signal [1]. During the parametric amplification process, the wavelengths of the pump and signal must fulfill the phase-matched condition which is determined by the balance between dispersion and nonlinearity in the parametric gain fiber to maximize the energy conversion, and it is different from the other conventional fiber optical amplifiers, such as Erbium-doped fiber amplifier and Raman amplifier [2]. This implies that the parametric gain can be tailored to any wavelength region by choosing a fiber with an appropriated dispersion as well as a proper pump wavelength. We interpret the output temporal and spectral profiles of this the passively mode-locked FOPO as a result of a direct mapping of the pump temporal intensity profile
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