Matte-Breton C, Chen H, Fontaine N K, Ryf R, Essiambre R-J, Kelly C, Jin C, Messaddeq Y, LaRochelle Sophie
Opt Express. 2018 Oct 1;26(20):26633-26645. doi: 10.1364/OE.26.026633.
We present the design and characterization of a cladding-pumped amplifier with erbium doping located in an annular region near the core. This erbium-doped fiber is proposed to reduce gain saturation, leading to smaller gain compression when compared to uniform core doping. Through numerical simulations, we first compare the performance of three fibers with different erbium doping profiles in the core or the cladding. When the doped fibers are operated at the optimum length, results show that the smaller overlap of the signal mode field with the annular erbium doping region leads to higher gain and lower saturation of the amplifier. A single-core erbium-doped fiber with an annular doping and a D-shaped cladding was fabricated. Measurements demonstrate less than 4 dB of gain compression over the C-band for input power ranging from -40 dBm to 3 dBm. Small gain compression EDFAs are of interest for applications that require input channel reconfiguration. Higher gain and saturation output power are also key issues in cladding-pumped multi-core amplifiers.
我们展示了一种包层泵浦放大器的设计与特性，其掺铒区域位于靠近纤芯的环形区域。提出这种掺铒光纤是为了降低增益饱和，与均匀纤芯掺杂相比，可导致更小的增益压缩。通过数值模拟，我们首先比较了三种在纤芯或包层具有不同掺铒分布的光纤的性能。当掺杂光纤在最佳长度下工作时，结果表明信号模场与环形掺铒区域的较小重叠会导致放大器具有更高的增益和更低的饱和度。制作了一种具有环形掺杂和D形包层的单芯掺铒光纤。测量结果表明，对于输入功率范围从 -40 dBm 到 3 dBm 的情况，在C波段上增益压缩小于4 dB。小增益压缩的掺铒光纤放大器对于需要输入通道重新配置的应用很有意义。更高的增益和饱和输出功率也是包层泵浦多芯放大器中的关键问题。
