E-band Nd3+ amplifier based on wavelength selection in an all-solid micro-structured fiber.
E-band Nd3+ amplifier based on wavelength selection in an all-solid micro-structured fiber.
复制标题
基于全固体微结构光纤波长选择的 E 波段 Nd3 放大器。
作者：
J. Dawson;Leily S. Kiani;P. Pax;Graham S. Allen;D. Drachenberg;V. Khitrov;Diana C. Chen;N. Schenkel;M. Cook;R. Crist;M. Messerly
介绍了一种增益范围为1376 ~ 1466 nm的Nd3+光纤放大器。这是通过波长选择性波导来实现的，该波导可以抑制850 nm和1150 nm之间的放大自发辐射。研究表明，激发态吸收（ESA）排除了1375 nm以下的净增益，除了1333 nm到1350 nm的小波段，ESA在1375 nm以上稳步减少，允许构建一个增益峰值在1400 nm和增益潜力从1375 nm到1500 nm的高效光纤放大器。在1402 nm处测量到峰值小信号增益为13.3 dB，噪声系数为7.6 dB。对Nd3+发射和激发态吸收截面的详细测量表明，改进后的纤维具有更好的性能潜力。具体来说，将光纤模场直径从10.5µm减小到5.25µm，并在1400 nm处将光纤背景损耗降低到<10 dB/km，这将使e波段光纤放大器的噪声系数< 5 dB，在30 nm带宽上的信号增益小于20 dB。这样的放大器将具有类似于当前铒光纤放大器的外形因素和光学特性，使现代光纤通信系统能够在e波段使用类似于C和L波段的放大器技术进行操作。
A Nd3+ fiber amplifier with gain from 1376 nm to 1466 nm is demonstrated. This is enabled by a wavelength selective waveguide that suppresses amplified spontaneous emission between 850 nm and 1150 nm. It is shown that while excited state absorption (ESA) precludes net gain below 1375 nm with the exception of a small band from 1333 nm to 1350 nm, ESA diminishes steadily beyond 1375 nm allowing for the construction of an efficient fiber amplifier with a gain peak at 1400 nm and the potential for gain from 1375 nm to 1500 nm. A peak small signal gain of 13.3 dB is measured at 1402 nm with a noise figure of 7.6 dB. Detailed measurements of the Nd3+ emission and excited state absorption cross sections suggest the potential for better performance in improved fibers. Specifically, reduction of the fiber mode field diameter from 10.5 µm to 5.25 µm and reduction of the fiber background loss to <10 dB/km at 1400 nm should enable construction of an E-band fiber amplifier with a noise figure < 5 dB and a small signal gain > 20 dB over 30 nm of bandwidth. Such an amplifier would have a form factor and optical properties similar to current erbium fiber amplifiers, enabling modern fiber optic communication systems to operate in the E-band with amplifier technology similar to that employed in the C and L bands.