Vakhrushev A S, Umnikov A A, Lobanov A S, Firstova E G, Evlampieva E B, Riumkin K E, Alyshev A V, Khegai A M, Guryanov A N, Iskhakova L D, Melkumov M A, Firstov S V
Opt Express. 2022 Jan 17;30(2):1490-1498. doi: 10.1364/OE.444360.
In this paper, we focus on the fabrication and investigation of optical properties of W-type and Graded-index single-mode Bi-doped germanosilicate fibers. The laser and gain characteristics of Bi-doped fibers of new designs were studied. It was shown that by variation of doping profile, it is possible to change characteristic parameters (active absorption, unsaturable loss level) of the active medium and, as a consequence, achieve an improvement of the performance of the optical devices based on these types of fibers. As a progress one can consider the creation of a Bi-doped fiber laser operating at 1460 nm with a record efficiency of 72% using a relatively short active fiber (L = 75 m); and a 20-dB Bi-doped fiber amplifier (L = 120 m) with a pump power of 45 mW (for the input signal powers lower than 30 µW) having a high gain efficiency of 0.52 dB/mW. We suggest that the obtained results could be a driver for further investigation in this direction.
在本文中，我们专注于W型和渐变折射率单模双掺杂锗酸盐光纤的制备及其光学性质研究。研究了新型双掺杂光纤的激光和增益特性。结果表明，通过改变掺杂分布，可以改变有源介质的特征参数（有源吸收、非饱和损耗水平），从而提高基于这类光纤的光学器件的性能。作为一项进展，可以考虑制造一种工作在1460 nm的双掺杂光纤激光器，使用相对较短的有源光纤（L = 75 m），效率达到创纪录的72%；以及一个20 dB的双掺杂光纤放大器（L = 120 m），泵浦功率为45 mW（对于输入信号功率低于30 μW），增益效率高达0.52 dB/mW。我们认为所获得的结果可能会推动在这个方向上的进一步研究。
