Novel design of inherently gain-flattened discrete highly nonlinear photonic crystal fiber Raman amplifier and dispersion compensation using a single pump in C-band.
Novel design of inherently gain-flattened discrete highly nonlinear photonic crystal fiber Raman amplifier and dispersion compensation using a single pump in C-band.
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DOI：
10.1364/opex.13.009516
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发表时间：
2005-11
期刊：
影响因子：
3.8
通讯作者：
S. Varshney;T. Fujisawa;K. Saitoh;M. Koshiba
中科院分区：
文献类型：
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作者：
S. Varshney;T. Fujisawa;K. Saitoh;M. Koshiba
在本文中，我们报告，为第一次，一个固有的增益平坦的离散高度非线性光子晶体光纤（HNPCF）的拉曼放大器（HNPCF-RA）的设计，显示13.7 dB的净增益（+/-0.85 dB的增益涟漪）超过28 nm的带宽。HNPCF的波长依赖性泄漏损耗特性被用来平坦化放大器模块的拉曼增益。光子晶体光纤的结构设计是基于W型折射率分布的光纤参数优化，其中的光纤参数是很好地结合了一个高效的矢量有限元法（V-FEM）的国内开发的遗传算法优化工具。所提出的光纤设计具有4.88 W（-1）的高拉曼增益效率。km（-1）的频率偏移为13.1 THz，这是通过V-FEM精确评估。此外，所设计的模块显示出超宽单模操作，在波长的操作范围内具有缓慢变化的负色散系数（在1550 nm处为-107.5 ps/nm/km）。因此，我们提出的HNPCF-RA模块作为一个复合放大器与色散补偿器功能，在一个单一的组成部分，使用一个单一的泵。
In this paper, we report, for the first time, an inherently gain-flattened discrete highly nonlinear photonic crystal fiber (HNPCF) Raman amplifier (HNPCF-RA) design which shows 13.7 dB of net gain (with +/-0.85-dB gain ripple) over 28-nm bandwidth. The wavelength dependent leakage loss property of HNPCF is used to flatten the Raman gain of the amplifier module. The PCF structural design is based on W-shaped refractive index profile where the fiber parameters are well optimized by homely developed genetic algorithm optimization tool integrated with an efficient vectorial finite element method (V-FEM). The proposed fiber design has a high Raman gain efficiency of 4.88 W(-1) . km(-1) at a frequency shift of 13.1 THz, which is precisely evaluated through V-FEM. Additionally, the designed module, which shows ultra-wide single mode operation, has a slowly varying negative dispersion coefficient (-107.5 ps/nm/km at 1550 nm) over the operating range of wavelengths. Therefore, our proposed HNPCF-RA module acts as a composite amplifier with dispersion compensator functionality in a single component using a single pump.