Ultra-Low-Noise Mode-Division Multiplexed WDM Transmission Over 100-km FMF Based on a Second-Order Few-Mode Raman Amplifier
Ultra-Low-Noise Mode-Division Multiplexed WDM Transmission Over 100-km FMF Based on a Second-Order Few-Mode Raman Amplifier
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DOI：
10.1109/jlt.2018.2839710
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发表时间：
2018-08
影响因子：
4.7
通讯作者：
Jiaxiong Li;Chengkun Cai;Jiangbing Du;Shoulin Jiang;Lin Ma;Lulu Wang;Long Zhu;Andong Wang;
中科院分区：
文献类型：
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作者：
Jiaxiong Li;Chengkun Cai;Jiangbing Du;Shoulin Jiang;Lin Ma;Lulu Wang;Long Zhu;Andong Wang;
我们首次展示了基于二阶少模拉曼放大器的 100 公里少模光纤上具有 8 个波分复用通道的超低噪声模分复用传输。为了最大限度地减少与模式相关的增益，两个波长为 1455 nm (75 mW) 和 1360 nm (1890 mW) 的反向去偏振泵浦同样发射到 LP11a 和 LP11b 模式。 LP01 和 LP11 模式的拉曼开关增益均高于 8 dB，且模式相关增益小于 0.7 dB。相对于一阶拉曼放大，二阶少模拉曼放大器的放大自发辐射噪声改善了 1.8 dB。二阶少模拉曼放大器的有效噪声系数约为 –3 dB，比一阶泵浦情况下的有效噪声系数低 ∼1.4 dB。传输实验中，分别进行LP01模式的单模传输和LP11a、LP11b模式的模分复用传输。由于二阶少模拉曼放大器的低噪声系数放大，所有传输通道的误码率均得到显着改善。
We demonstrate, for the first time, an ultra-low-noise mode-division multiplexed transmission with eight wavelength-division multiplexed channels over a 100-km few-mode fiber based on a second-order few-mode Raman amplifier. To minimize the mode dependent gain, two backward depolarized pumps at the wavelengths of 1455 nm (75 mW) and 1360 nm (1890 mW) are equally launched both into the LP11a and LP11b modes. The Raman on–off gains of the LP01 and LP11 modes are both above 8 dB and the mode dependent gain is less than 0.7 dB. An amplified spontaneous emission noise improvement of 1.8 dB is achieved in the second-order few-mode Raman amplifier, with respect to the first-order Raman amplification. The effective noise figure of the second-order few-mode Raman amplifier is about –3 dB, which is ∼1.4 dB lower than that in the first-order pumping case. In the transmission experiments, a single-mode transmission over LP01 mode and a mode-division multiplexed transmission over LP11a and LP11b modes are performed separately. The bit-error-rates for all the transmission channels are significantly improved due to the low-noise figure amplification of the second-order few-mode Raman amplifier.