Reduction of excess intensity noise of picosecond Yb soliton fiber lasers in a >10-mW power regime

Abstract

We demonstrate that excess intensity noise of soliton fiber lasers in the average power regime exceeding 10 mW can be reduced by increasing the intracavity dispersion and reducing the pump power. Based on this strategy, we present a polarization-maintaining picosecond Yb fiber laser mode-locked by a nonlinear amplifying loop mirror whose excess noise is equal to the shot noise at an optical power of >10 mW.

Analysis of the Passive Stabilization Methods of Optical Frequency Comb in Ultrashort-Pulse Erbium-Doped Fiber Lasers

“…In other words, the measured power spectral density of RIN with a photodetector consists of electronic noise that is inversely proportional to the square of average current (therefore to the optical power), shot noise is inversely proportional to the average current (therefore to the optical power), and the excess noise that is independent of the optical power. Equation ( 5) explains why the RIN decreases when the optical power is increased [37]. It should be noted that electronic noise can be made negligible by choosing a highquality photodetector and laser intensity.…”

“…As shown in [40], RIN increases linearly with increasing cavity losses by decreasing the cavity finesse. However, there is a certain case of soliton laser [37] when increasing the pump power and the optical power led to high excess noise; therefore, with the same optical power, RIN decreased with pump power 370, 558, and 627 mW, respectively.…”

“…The PSD-RIN of Yb soliton fiber laser was measured in [37] with various total intracavity dispersion values (−3.7 , −10.6 𝑝𝑝𝑝𝑝 2 , −37.5 𝑝𝑝𝑝𝑝 2 ), and the results showed a decrease in RIN as a function of optical power (𝑝𝑝 > 10 𝑚𝑚𝑚𝑚) only at 𝛽𝛽 2 = −37.5 ps 2 , while a maintenance of RIN was seen for the other values of total intra-cavity dispersion. This can be explained as follows: with optical power 𝑝𝑝 > 10 𝑚𝑚𝑚𝑚, excess noise dominates and the dependence of RIN on 𝛽𝛽 2 is stronger than its dependence on optical power.…”

Multi-color stimulated Raman scattering with a frame-to-frame wavelength-tunable fiber-based light source

“…2(c) and showed a decrease for an increasing photodiode current, with a minimum of 153.7 dBc/Hz at 3 mA photodiode current. In addition, curves for the theoretical shot noise (black dashed line) and the estimated thermal noise [34,35] together with the measured noise of the instruments (grey dashed line) were added. Moreover, the blue dotted line was fitted to match the measured data points and represents the sum of all noise contributions.…”

All-fiber polarization-maintaining system for noise suppression and signal amplification of picosecond pulses

“…Recently, we proposed a fiber laser oscillator with an ultralow-RIN of −161.4 dB Hz −1 and an output average power of 24 mW. 19,20) The RIN is reduced in an intracavity way by increasing the intracavity dispersion and optimizing the cavity loss. Such low-noise pulses are expected to be suitable for the following optical amplification.…”