Varshney Shailendra K, Fujisawa Takeshi, Saitoh Kunimasa, Koshiba Masanori
Opt Express. 2006 Apr 17;14(8):3528-40. doi: 10.1364/oe.14.003528.
This paper presents an optimized design of a dispersion compensating photonic crystal fiber (PCF) to achieve gain-flattened Raman performances over S-band using a single pump. Genetic algorithm interfaced with an efficient full-vectorial finite element modal solver based on curvilinear edge/nodal elements is used as an optimization tool for an accurate determination of PCF design parameters. The designed PCF shows high negative dispersion coefficient (-264 ps/nm/km to -1410 ps/nm/km) and negative dispersion slope, providing coarse dispersion compensation over the entire S-band. The module comprised of 1.45-km long optimized PCF exhibits +/-0.46 dB gain ripples over 50 nm wide bandwidth and shows a very low double Rayleigh backscattering value (-59.8 dB). The proposed module can compensate for the dispersion accumulated in one span (80-km) of standard single mode fiber with a residual dispersion of +/-700 ps/nm, ensuring its applicability for 10 Gb/s WDM networks. Additionally, the designed PCF remains single mode over the range of operating wavelengths.
本文提出了一种色散补偿光子晶体光纤（PCF）的优化设计方案，该方案使用单个泵浦在S波段实现增益平坦的拉曼性能。基于曲线边/节点单元的遗传算法与高效的全矢量有限元模态求解器相结合，用作优化工具，以精确确定PCF设计参数。所设计的PCF显示出高负色散系数（-264 ps/nm/km至-1410 ps/nm/km）和负色散斜率，在整个S波段提供粗略的色散补偿。由1.45公里长的优化PCF组成的模块在50纳米宽带宽上表现出+/-0.46分贝的增益纹波，并且显示出非常低的双瑞利背向散射值（-59.8分贝）。所提出的模块可以补偿标准单模光纤一个跨度（80公里）中积累的色散，残余色散为+/-700 ps/nm，确保其适用于10 Gb/s波分复用（WDM）网络。此外，所设计的PCF在工作波长范围内保持单模。
