Tang Hengsheng, Li Yigang, Zhang Yanwu, Li Yingfeng, Li Hao, Tu Xin, Wu Xiang, Liu Liying, Xu Lei
The State Key Lab for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China.
Opt Express. 2008 Jun 23;16(13):9844-9. doi: 10.1364/oe.16.009844.
A semi-weakly confined waveguide structure was designed and fabricated. This waveguide structure has a 350 nm thin core layer. Its optical mode field is weakly confined in vertical direction but is strongly confined laterally. The waveguide can support a nearly circular optical field distribution that matches well with a single-mode fiber. An erbium-doped waveguide amplifier (EDWA) with the new waveguide structure was fabricated by sol-gel method. The EDWA has a passive core and double-layered buffer/cladding. A small coupling loss of 0.4 dB/facet and an internal gain of 1.9 dB via evanescent wave amplification near 1550 nm were obtained.
设计并制作了一种半弱约束波导结构。这种波导结构有一个350纳米厚的纤芯层。其光模场在垂直方向上弱约束，但在横向方向上强约束。该波导能够支持与单模光纤良好匹配的近似圆形光场分布。采用溶胶-凝胶法制作了具有这种新型波导结构的掺铒波导放大器（EDWA）。该EDWA有一个无源纤芯和双层缓冲/包层。在1550纳米附近通过倏逝波放大获得了0.4分贝/面的小耦合损耗和1.9分贝的内部增益。
