Impulse Response Measurement of Few-Mode Fiber Systems by Coherence-Recovered Linear Optical Sampling
Impulse Response Measurement of Few-Mode Fiber Systems by Coherence-Recovered Linear Optical Sampling
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DOI：
10.1109/jlt.2017.2730845
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发表时间：
2017-10
影响因子：
4.7
通讯作者：
N. Kono;F. Ito;D. Iida;Tetsuya Manabe
中科院分区：
文献类型：
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作者：
N. Kono;F. Ito;D. Iida;Tetsuya Manabe
本文介绍了通过使用相干恢复线性光学采样或两梳干涉仪获得的少模光纤和传输线的脉冲响应测量。进行测量时，探头脉冲源和采样脉冲源可能距离较远，特别是当光纤安装在现场时，光纤长度可能超过几十公里。在本文中，通过修改先前提出的参考技术，通过消除由光源和光纤中的扰动引起的相位噪声，等效地保持两个脉冲激光器之间的相干性。因此，幅度平均用于提高信噪比。因此，我们可以测量多模光纤的脉冲响应，动态范围为 80 dB，时间分辨率为几皮秒，差模延迟超过数十纳秒。
This paper presents impulse response measurements of few-mode optical fibers and transmission lines that were obtained by using coherence-recovered linear optical sampling or a two-comb interferometer. When performing a measurement, the probe pulse source and the sampling pulse source may be far from each other, particularly when the fibers are installed in the field, and the fiber length may exceed several tens kilometers. In this paper, by modifying a previously proposed referencing technique, the coherence between two pulse lasers is equivalently maintained by canceling out the phase noise caused both by the light sources and perturbations in the fiber. Hence, the amplitude averaging is used to enhance the signal-to-noise ratio. As a result, we can measure the impulse responses of multimode fibers with a dynamic range of 80 dB and a time resolution of a few picoseconds, over tens nanoseconds of differential mode delay.