Advanced Photonics Concepts Laboratory, Department of Engineering Physics, Ecole Polytechnique de Montreal, Montreal, Quebec, Canada.
Opt Lett. 2013 Aug 1;38(15):2760-2. doi: 10.1364/OL.38.002760.
We experimentally demonstrate the possibility of agile multicasting for wavelength division multiplexing (WDM) networks, of a single-channel to two and seven channels over the C band, also extendable to S and L bands. This is based on cascaded χ(2) nonlinear mixing processes, namely, second-harmonic generation (SHG)-sum-frequency generation (SFG) and difference-frequency generation (DFG) in a 20-mm-long step-chirped periodically poled lithium niobate crystal, specially designed and fabricated for a 28-nm-wide SH-SF bandwidth centered at around 1.55 μm. The multiple idlers are simultaneously tuned by detuning the pump wavelengths within the broad SH-SF bandwidth. By selectively tuning the pump wavelengths over less than 10 and 6 nm, respectively, multicasting into two and seven idlers is successfully achieved across ~70 WDM channels within the 50 GHz International Telecommunication Union grid spacing.
我们通过实验演示了在 C 波段，单通道到双通道和七通道的灵活组播的可能性，也可扩展到 S 和 L 波段。这是基于级联 χ(2)非线性混合过程，即在 20 毫米长的阶梯啁啾周期性极化铌酸锂晶体中实现的二次谐波产生 (SHG)-和频产生 (SFG) 和差频产生 (DFG)，该晶体是专门设计和制造的，用于在大约 1.55 μm 的中心处具有 28nm 宽的 SH-SF 带宽。通过在宽带 SH-SF 带宽内调谐泵浦波长，可以同时调谐多个闲频光。通过分别在小于 10nm 和 6nm 的范围内选择性地调谐泵浦波长，成功地在 50GHz 国际电信联盟网格间隔内的约 70 个 WDM 信道中实现了到两个和七个闲频光的组播。
