Looped Polarization-Insensitive Fiber Optical Parametric Amplifiers for Broadband High Gain Applications
Looped Polarization-Insensitive Fiber Optical Parametric Amplifiers for Broadband High Gain Applications
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DOI：
10.1109/jlt.2021.3099441
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发表时间：
2021-10
影响因子：
4.7
通讯作者：
V. Gordienko;F. Ferreira;C. Gaur;N. Doran
中科院分区：
文献类型：
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作者：
V. Gordienko;F. Ferreira;C. Gaur;N. Doran
我们研究了使用至少两根单向增益光纤的平衡偏振分集环的偏振不敏感光纤参数放大器(FOPA)。我们描述并比较了三种不同的环路偏振不敏感FOPA，它们分别针对噪声系数、非线性损伤的缓解以及它们的权衡进行了优化。测试场景包括将一组21×50 GHz间隔的通道(包括35 Gbaud的PDM-QPSK信号)放大高达14分贝，并评估每个变量的非线性串扰功率、噪声系数和放大的信号误码率。首次实现了输出功率为23dBm的偏振不敏感FOPA放大WDM信号，噪声系数低至5.8dBm。测试结果使我们能够确定每个循环FOPA变体的可能应用场景。我们论证了偏振不敏感FOPA在未来光通信系统中的潜在应用，证明了它能够在高达29dBm的输出信号功率下提供低噪声系数和6dBm的低噪声系数，并使最突出的单极化FOPA实现超宽高增益的偏振不敏感增益。
We investigate polarization insensitive fiber optical parametric amplifiers (FOPAs) employing a balanced polarization diversity loop with at least two unidirectional gain fibers. We describe and compare three variants of looped polarization insensitive FOPAs optimized for noise figure, mitigation of nonlinear impairments and their trade-off, respectively. The test scenario consists of amplifying, by up to 14 dB, a set of 21 × 50 GHz-spaced channels including a 35 GBaud PDM-QPSK signal, and evaluating a power of nonlinear crosstalk, noise figure and amplified signal BER for each variant. For the first time we demonstrate a polarization insensitive FOPA amplifying WDM signals with a noise figure as low as 5.8 dB, and a polarization insensitive FOPA with output WDM signal power of 23 dBm. The testing results let us identify likely application scenarios for each looped FOPA variant. We justify potential implementation of polarization-insensitive FOPAs in future optical communication systems by arguing its ability to deliver low noise figure <6 dB for output signal power as high as 29 dBm and to enable polarization insensitive gain for the most prominent single-polarization FOPA achievements realizing ultrawide high gain.