Jin Cang, Ung Bora, Messaddeq Younès, LaRochelle Sophie
Opt Express. 2015 Nov 16;23(23):29647-59. doi: 10.1364/OE.23.029647.
We propose and numerically investigate annular-cladding erbium doped multicore fibers (AC-EDMCF) with either solid or air hole inner cladding to enhance the pump power efficiency in optical amplifiers for spatial division multiplexing (SDM) transmission links. We first propose an all-glass fiber in which a central inner cladding region with a depressed refractive index is introduced to confine the pump inside a ring-shaped region overlapping the multiple signal cores. Through numerical simulations, we determine signal core and annular pump cladding parameters respecting fabrication constraints. We also propose and examine a multi-spot injection scheme for launching the pump in the annular cladding. With this all-glass fiber with annular cladding, our results predict 10 dB increase in gain and 21% pump power savings compared to the standard double cladding design. We also investigate a fiber with an air hole inner cladding to further enhance the pump power confinement and minimize power leaking into the inner cladding. The results are compared to the all-glass AC-EDMCF.
我们提出并通过数值研究了具有实心或气孔内包层的环形包层掺铒多芯光纤（AC-EDMCF），以提高用于空间分割复用（SDM）传输链路的光放大器中的泵浦功率效率。我们首先提出了一种全玻璃光纤，其中引入了具有低折射率的中央内包层区域，以将泵浦限制在与多个信号纤芯重叠的环形区域内。通过数值模拟，我们在考虑制造限制的情况下确定了信号纤芯和环形泵浦包层参数。我们还提出并研究了一种用于在环形包层中注入泵浦的多点注入方案。对于这种具有环形包层的全玻璃光纤，我们的结果预测，与标准双包层设计相比，增益将提高10 dB，泵浦功率将节省21%。我们还研究了一种具有气孔内包层的光纤，以进一步提高泵浦功率限制并使泄漏到内包层中的功率最小化。将结果与全玻璃AC-EDMCF进行了比较。
