A wideband and flat gain erbium-doped fibre amplifier (EDFA) is demonstrated using a hybrid gain medium of a zirconiabased erbium-doped fibre (Zr-EDF) and a high concentration erbium-doped fibre (EDF). The amplifier has two stages comprising a 2-m-long ZEDF and 9-m-long EDF optimised for C- and L-band operations, respectively, in a double-pass parallel configuration. A chirp fibre Bragg grating (CFBG) is used in both stages to ensure double propagation of the signal and thus to increase the attainable gain in both C- and L-band regions. At an input signal power of 0 dBm, a flat gain of 15 dB is achieved with a gain variation of less than 0.5 dB within a wide wavelength range from 1530 to 1605 nm. The corresponding noise figure varies from 6.2 to 10.8 dB within this wavelength region.ud
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机译：使用基于氧化锆的掺-光纤（Zr-EDF）和高浓度掺fiber光纤（EDF）的混合增益介质，展示了宽带平坦增益掺b光纤放大器（EDFA）。该放大器具有两个级，分别包括一个2 m长的ZEDF和9 m长的EDF，分别以双通并行配置针对C和L波段操作进行了优化。在这两个阶段都使用了rp光纤布拉格光栅（CFBG），以确保信号的双重传播，从而提高了C波段和L波段区域的可获得增益。在0 dBm的输入信号功率下，在1530至1605 nm的宽波长范围内，增益变化小于0.5 dB时，可获得15 dB的平坦增益。在此波长范围内，相应的噪声系数在6.2dB至10.8dB之间变化。 ud
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