Abstract
Abstract Gain-parameter-dependent transfer functions and phase-noise performances in a mode-locked Yb-doped fiber laser are measured in this study. It is discovered that the corner frequency in the amplitude and phase domains is determined by the absorption coefficient of the gain fiber, when the total absorption and other cavity parameters are fixed. This shows that an oscillator using gain fiber with higher dopant concentration accumulates more phase noise. Furthermore, we present net cavity dispersion-dependent transfer functions to verify the effect of dispersion management on the frequency response. We derive a guideline for optimizing mode-locked fiber laser design to achieve low phase noise and timing jitter.
Highlights
Mode-locked lasers that deliver pulse trains with ultralow phase noise repetition rates are potential low timing jitter sources for many applications, such as optical clock distribution[1], high-speed optical data transmission[2], highresolution photonics sampling and analog-to-digital converters[3], and synchronization of pump–probe laser systems[4]
We demonstrate that the relative intensity noise (RIN)-transfer function is dependent on the variational net-cavity dispersion
We have experimentally investigated the effects of the dopant concentration of a gain fiber and net cavity dispersion on oscillator phase noise characteristics
Summary
Mode-locked lasers that deliver pulse trains with ultralow phase noise repetition rates are potential low timing jitter sources for many applications, such as optical clock distribution[1], high-speed optical data transmission[2], highresolution photonics sampling and analog-to-digital converters[3], and synchronization of pump–probe laser systems[4]. Theoretical models predict that the saturation of an amplifier is crucial for RIN-transfer dynamics Several parameters, such as the mode field area, absorption, upper state lifetime, and stimulated emission cross-section of the gain fiber, determine the amplifier’s gain saturation[18,19]. The RIN-transfer dynamics is a complex problem, including the intricate interplay of the strong nonlinear, dispersive, and dissipating pulse shaping effects, the transfer function is measured in our work to simplify the analysis process to characterize RIN-transfer dynamics It describes the relationship between pump modulation and the induced modulation on the output of the mode-locked laser[17]. Gain parameters dependent on RIN-transfer dynamics and phase noise performances in a mode-locked Yb-doped fiber laser are investigated experimentally in this study. At the same time, keeping the oscillator near the zero-dispersion point can reduce the phase noise
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