研究目的
Investigating the measurement of polarization transient effects in single mode optical fiber caused by mechanical stress and evaluating the possibility of monitoring unexpected events near the fiber route.
研究成果
The proposed method based on polarizing beam splitter and a balanced detector shows satisfactory results for monitoring unexpected events near the fiber route, providing a cost-effective solution with the ability to perform quick evaluation of the event frequency using FFT.
研究不足
The sensitivity of the polarimeter based on balanced detector depends mainly on the polarization state before the polarization beam splitter. The system is maximally sensitive when the polarization is linear with angle π/4. Despite the inability to determine the ellipticity of the polarization, the method is sensitive enough to detect polarization transient effects.
1：Experimental Design and Method Selection:
The experiment was designed to verify the possibility of sensing the optical fiber route by measuring polarization transient effects caused by mechanical stress. A laboratory workplace was set up with a low-noise DFB laser as a transmitter, a fiber link emulated by a 1 km long G.652D fiber spool, and a fiber wound piezoelectric stretcher to simulate external perturbations.
2：Sample Selection and Data Sources:
The experiment used a 1 km long G.652D fiber spool and SMF28e+ fiber for the stretcher.
3：List of Experimental Equipment and Materials:
Equipment included a DFB laser LD101, fiber stretcher Optiphase PZ3-SMF2-O, polarization beam splitter and balanced detector Koheron PD100B-AC, and a Redpitaya development platform for sampling.
4：Experimental Procedures and Operational Workflow:
The polarization monitoring was carried out with the polarization beam splitter and balanced detector, and the difference signal was sampled and sent to PC for post-processing. The results were compared with those from a commercially available polarimeter Thorlabs PAX
5：Data Analysis Methods:
10 The polarization rotation rate was determined from the sampled difference signal and compared with the results from the polarimeter.
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