Abstract
We propose and demonstrate a cladding-pumped, erbium-ytterbium co-doped fiber amplifier (EYDFA) scheme based on dual wavelength auxiliary signal injection technique to solve the issue of the backward Yb-ASE self-lasing under strong pumping for the high-power fiber amplification of 1.5-μm kHz-linewidth linearly-polarized laser signal. With the dual wavelength auxiliary signal of 1030 and 1040 nm injection, the allowable maximum pump power without triggering the backward Yb-ASE self-lasing can be greatly increased due to the relieving effect on the inhomogeneous gain broadening. For an EYDFA with 3.8-m erbium-ytterbium co-doped double-clad fiber, the net output power is improved to 13.8 W, while the linewidth of the amplified single-transverse-mode linearly-polarized 1560 nm laser signal is still only 3.5 kHz. The SBS effect is observed to be trivial during the fiber amplification.
Highlights
High-Power linearly-polarized continuous wave lasers with kHz-linewidth are highly important in many applications including nonlinear frequency conversion, laser radar, and coherent detection [1]–[3]
We propose and demonstrate a cladding-pumped, erbium-ytterbium co-doped fiber amplifier (EYDFA) scheme based on dual wavelength auxiliary signal injection technique to solve the issue of the backward Yb-ASE self-lasing under strong pumping for the high-power fiber amplification of 1.5-μm kHz-linewidth linearly-polarized laser signal
This indicates that the allowable maximum pump power is 21 W, and the 1560 nm signal output power is limited to 8.15 W if the EYDFA operates without auxiliary signal injection
Summary
High-Power linearly-polarized continuous wave lasers with kHz-linewidth are highly important in many applications including nonlinear frequency conversion, laser radar, and coherent detection [1]–[3]. Regarding 1.5-μm bands, common erbium-doped fibers (EDFs), where the doping concentration is relatively low to avoid material effects such as clusters, are usually used for fiber amplifiers [5]. This makes it very difficult to enhance the output power of such fiber amplifiers. The erbium doping concentration in the EY-DCF may be much higher than that in common EDFs. the erbium doping concentration in the EY-DCF may be much higher than that in common EDFs This makes it possible to use a shorter EY-DCF in 1.5-μm high-power fiber amplification, which is very beneficial for suppressing the stimulated Brillouin scattering (SBS) effect in laser signals with very narrow linewidth [10]
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