Yu Cheng, Hu Guijun, Wang Fei, Li Jiaying, Zhao Dan, Zhang Meiling
Opt Lett. 2021 Nov 1;46(21):5509-5512. doi: 10.1364/OL.441348.
We propose a few-mode erbium-ytterbium codoped polymer optical waveguide amplifier employing mode-selective photonic lanterns capable of multiplexing and demultiplexing. A reconfigurable pump configuration scheme is adopted to balance the modal gain per mode. A square few-mode waveguide amplifier supporting , , and modes is designed and fabricated. The crosstalk effect and modal profiles are characterized. An average gain of 10.4 dB per mode is obtained in a 1.5 cm waveguide at 1555 nm through pumping of the mode at 320 mW and the mode at 120 mW at 976 nm. The ultralow differential modal gain is 0.4 dB. In addition, simultaneously amplified , , and modes are also demonstrated across the whole C-band with low noise figures. To the best of our knowledge, this is the first report of an experimental realization of a few-mode optical waveguide amplifier.
我们提出了一种采用能够进行复用和解复用的模式选择光子灯笼的几模铒镱共掺杂聚合物光波导放大器。采用了一种可重构的泵浦配置方案来平衡每个模式的模态增益。设计并制作了一种支持(LP_{01})、(LP_{11})和(LP_{21})模式的方形几模光波导放大器。对串扰效应和模态分布进行了表征。通过在976nm波长下以320mW泵浦(LP_{01})模式和以120mW泵浦(LP_{11})模式，在1555nm波长下1.5cm长的波导中每个模式获得了10.4dB的平均增益。超低差分模态增益为0.4dB。此外，还展示了在整个C波段同时放大(LP_{01})、(LP_{11})和(LP_{21})模式且噪声系数较低的情况。据我们所知，这是关于几模光波导放大器实验实现的首次报道。
