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Impulse response of weakly-coupled multicore fiber measured by using high-dynamic-range linear optical sampling

机译：高动态范围线性光学采样法测量弱耦合多芯光纤的脉冲响应

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We report the impulse response measurement of weakly-coupled homogeneous multicore fiber accomplished by coherence-recovered linear optical sampling, which simultaneously realizes a picosecond-level time resolution and a dynamic range of over 70 dB. The observed core-by-core impulse responses include a directly transmitted pulse and plateaus that are yielded by inter-core couplings. A consideration of the observed results suggests that the group velocities are perturbed, and the core with the slowest group velocity alters along the fiber. We also found that the polarization states of the plateaus alter in the time axis of the impulse response chart, with a correlation width as short as the pulse width: we presume that this phenomenon is observed because the polarization change that occurs during propagation is transferred to the coupled signals with the shrinkage of the time axis. Next, we selected a 100 m-long piece of fiber, and measured the group delay of each core. We found that the variation of the core-by-core group delays was not similar to that of the long fiber, and it may change considerably with bending induced in the fiber. These results also suggest a variation in the local group delays over the length of the fiber.
机译：我们报告了通过相干恢复线性光学采样完成的弱耦合均质多芯光纤的脉冲响应测量，该采样同时实现了皮秒级的时间分辨率和超过70 dB的动态范围。观察到的核心间冲激响应包括直接传输的脉冲和核心间耦合产生的平稳期。考虑到观察到的结果表明，群速度受到干扰，群速度最慢的纤芯沿纤维改变。我们还发现，高原的极化状态在脉冲响应图的时间轴上发生变化，相关宽度与脉冲宽度一样短：我们假定观察到此现象，因为传播过程中发生的极化变化被传递到随时间轴的收缩而耦合的信号。接下来，我们选择了一条100 m长的光纤，并测量了每个纤芯的群时延。我们发现，纤芯组延迟的变化与长光纤的变化不相似，并且随着光纤中弯曲引起的变化可能会发生很大变化。这些结果还表明，局部群延迟在光纤的长度上有所变化。

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