Quantifying Raman and emission gain coefficients of Ho3+ doped TeO2·ZnO·PbO·PbF2·Na2O (TZPPN) tellurite glass

Broadband amplifier emission near the second telecommunication window in Ho³⁺ doped 76TeO₂·10ZnO·9.0PbO·1.0PbF₂·3.0Na₂O was studied. The optical transition properties and radiative lifetimes of several excited states of Ho³⁺ have been predicted using intensity Judd–Ofelt parameters. The emission cross section for Ho³⁺ in this glass, around 2 μm, was calculated according to McCumber theory. The maximum stimulated emission cross section was calculated to be 0.9 × 10⁻²⁰ cm² for 2046 nm emissions. The theoretical gain cross sections was evaluated and positive gain bands was anticipated. Furthermore, the peak Raman gain coefficient in the present glass was around 250 times larger than that of SiO₂.     

反向抽运光纤喇曼放大器增益特性分析

将打靶法和龙格库塔法两种数值计算方法相结合,对反向抽运光纤喇曼放大器中信号光和抽运光相互作用的耦合微分方程进行数值求解.在分别选取不同参量且取不同值的条件下,详细分析了光纤长度、初始信号光功率、初始抽运光功率、光纤有效面积、喇曼增益系数及光纤对信号光与抽运光的损耗等参量对增益的影响,最后提出了有效提高增益的方法.     

氧碘化学激光器增益谱线的精细结构及腔内温度

 采用可调谐二极管激光器做探测光源,测量了超音速氧碘化学激光器增益谱线的精细结构,得到了各谱线相对强度的百分比。同时也推得了增益线宽与腔内温度。     

光纤光栅的温度增敏实验

用热膨胀系数较大的聚合物材料对光纤光栅进行封装处理,极大地提高了光纤光栅的温度灵敏度。我们将光纤光栅封装于两种不同的聚合物材料中,其温度灵敏度分别提高6倍和23倍之多。这是迄今有文献报道的最大的光纤光栅温度灵敏度。     

Gain Stabilization in All-Optical Gain-Clamped Cascade of Praseodymium-Doped Fluoride Fiber Amplifiers

The authors present theoretical results of an analysis of an all-optical gain-clamped (AOGC) praseodymium-doped fluoride fiber amplifier (PDFFA) for protecting surviving channels in an amplified wavelength division multiplexed (WDM) network with six cascaded PDFFAs. The theoretical analysis is based on application of a large-signal numerical model that takes into account propagation of pump, signal, and downstream and upstream amplified spontaneous emission and includes time variation effects in a four-level laser system. It is shown that power excursions caused in an eight-channel WDM network by loss addition of six channels could be lower than 1 dB and free of relaxation oscillations if the AOGC PDFFA is strongly inverted and the total loss of the ring resonator is appropriately set.