Abstract The RE-co-doped silica optical fibers emitting in the eye-safe spectral range are still attractive for new applications like LIDAR, pollution monitoring, navigation, and free-space optical communication. High gain and beam quality of fiber sources based on large mode area (LMA) active fibers can be fabricated by the well-known Modified Chemical Vapor Deposition (MCVD) technology improved by the chelate doping system. Considering silica matrix, the most interesting co-dopants in the region above 1400 nm are thulium and holmium. In the paper Tm3+/Ho3+ and Yb3+/Tm3+ co-doped silica optical fibers (refractive index and rare earth distribution profile, luminescence) are presented. Their respective emission spectra has been measured over the range 1550–2150 nm for Tm3+/Ho3+ (exc. at 796 nm) and 1600–2100 nm for Yb3+/Tm3+ (exc. at 976 nm). A wide luminescent spectrum has been recorded from RE co-doping of silica glass during the MCVD process and we were able to achieve the appropriate and uniform concentration for getting the conditions of energy transfer. The fabrication and characterization of Tm3+/Ho3+ and Yb3+/Tm3+ co-doped optical fibres are presented. The analysis of luminescence spectrum changes vs. fibre length has shown that there is Amplified Spontaneous Emission (ASE) at 1960 nm in Yb3+/Tm3+ co-doped optical fibre. The possibilities of obtaining novel constructions of RE co-doped optical fibers for eye-safe emission region will be also shown.

中文翻译：

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使用 MCVD-CDS 系统制造的 Tm3+/Ho3+ 和 Yb3+/Tm3+ 共掺杂光纤中的人眼安全发射

摘要 在人眼安全光谱范围内发射的稀土共掺杂石英光纤对于激光雷达、污染监测、导航和自由空间光通信等新应用仍然具有吸引力。基于大模式面积 (LMA) 有源光纤的光纤源的高增益和光束质量可以通过众所周知的改良化学气相沉积 (MCVD) 技术制造，该技术经过螯合掺杂系统的改进。考虑到二氧化硅基质，1400 nm 以上区域中最有趣的共掺杂剂是铥和钬。在论文中，介绍了 Tm3+/Ho3+ 和 Yb3+/Tm3+ 共掺杂石英光纤（折射率和稀土分布曲线，发光）。它们各自的发射光谱在 1550–2150 nm Tm3+/Ho3+（不包括 796 nm）和 1600–2100 nm（不包括 976 nm）的 Yb3+/Tm3+ 范围内测量。在 MCVD 过程中，从石英玻璃的 RE 共掺杂记录了宽的发光光谱，我们能够实现适当且均匀的浓度，以获得能量转移的条件。介绍了 Tm3+/Ho3+ 和 Yb3+/Tm3+ 共掺杂光纤的制备和表征。发光光谱随光纤长度变化的分析表明，Yb3+/Tm3+ 共掺杂光纤在 1960 nm 处存在放大自发发射 (ASE)。还将展示获得用于人眼安全发射区域的新型稀土共掺杂光纤结构的可能性。介绍了 Tm3+/Ho3+ 和 Yb3+/Tm3+ 共掺杂光纤的制备和表征。发光光谱随光纤长度变化的分析表明，Yb3+/Tm3+ 共掺杂光纤在 1960 nm 处存在放大自发发射 (ASE)。还将展示获得用于人眼安全发射区域的新型稀土共掺杂光纤结构的可能性。介绍了 Tm3+/Ho3+ 和 Yb3+/Tm3+ 共掺杂光纤的制备和表征。发光光谱随光纤长度变化的分析表明，Yb3+/Tm3+ 共掺杂光纤在 1960 nm 处存在放大自发发射 (ASE)。还将展示获得用于人眼安全发射区域的新型稀土共掺杂光纤结构的可能性。