Erbium doped fiber amplifiers play an important role in various applications, spanning from fiber communication to optical sensing. Unfortunately, their gain bandwidth is limited to telecom C- and L-bands (from 1530–1625 nm). The application of bismuth-doped fibers is a promising approach for optical signal amplification at longer wavelengths. In this paper, a bismuth-doped fiber power amplifier seeded with a 1651 nm single-frequency laser diode is presented and its performance is experimentally analyzed. This amplifier may be used to improve performance of systems for methane detection, e.g. those based on photoacoustic spectroscopy or in remote/stand-off configuration (methane has a molecular absorption line near to 1651 nm). Two configurations of the amplifier are demonstrated and in both cases an output power of more than 80 mW is obtained. Limitations of current design are discussed. The obtained results give good a perspective for simple and compact fiber amplifiers with o...

中文翻译：

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1651 nm单频掺铋光纤功率放大器

掺光纤放大器在从光纤通信到光学传感的各种应用中都起着重要作用。不幸的是，它们的增益带宽仅限于电信C波段和L波段（1530–1625 nm）。掺铋光纤的应用是一种在更长波长下放大光信号的有前途的方法。本文提出了一种掺有1651 nm单频激光二极管的掺铋光纤功率放大器，并对其性能进行了实验分析。该放大器可用于改善甲烷检测系统的性能，例如，基于光声光谱或远程/隔离配置（甲烷的分子吸收线接近1651 nm）的系统。演示了放大器的两种配置，在两种情况下均获得了超过80 mW的输出功率。讨论了当前设计的局限性。获得的结果为简单紧凑的光纤放大器提供了良好的前景。