Ono Hirotaka, Hosokawa Tsukasa, Ichii Kentaro, Matsuo Shoichiro, Nasu Hitoshi, Yamada Makoto
Opt Express. 2015 Oct 19;23(21):27405-18. doi: 10.1364/OE.23.027405.
A fiber amplifier supporting 2 LP modes that employs a ring-core erbium-doped fiber (RC-EDF) is investigated to reduce differential modal gain (DMG). The inner and outer radii of the ring-core of the RC-EDF are clarified for 2-LP mode operation of the amplifier, and are optimized to reduce the DMG. It is shown that using the overlap integral between the erbium-doped core area and the signal power mode distribution is a good way to optimize the inner and outer radii of the ring-core of the RC-EDF and thus minimize the DMG. A fabricated RC-EDF and a constructed 2-LP mode EDFA are described and a small DMG of around 1 dB is realized for LP01, LP11 and LP21 pumping.
研究了一种采用环形芯掺铒光纤（RC-EDF）的支持2种LP模式的光纤放大器，以降低差分模式增益（DMG）。明确了RC-EDF环形芯的内半径和外半径，以实现放大器的2-LP模式运行，并对其进行了优化以降低DMG。结果表明，利用掺铒纤芯区域与信号功率模式分布之间的重叠积分是优化RC-EDF环形芯内半径和外半径从而最小化DMG的一种好方法。描述了制作的RC-EDF和构建的2-LP模式掺铒光纤放大器（EDFA），并在LP01、LP11和LP21泵浦情况下实现了约1 dB的小DMG。
