研究目的
To present a measurement technique using a four-wavelength bidirectional OTDR for evaluating the chromatic dispersion distribution along an optical fiber transmission system with an improved correction factor.
研究成果
The OTDR-based nondestructive technique with the proposed new correction factor provides superior measurement of the CD distribution along the optical fiber transmission system, offering more accurate and precise results compared to previous methods.
研究不足
The technique assumes negligible fluctuation in the local scattering coefficient compared to that in the MFD, which may not hold true for all fiber types. The method also requires more than three wavelengths for accurate MFD derivative approximation.
1：Experimental Design and Method Selection:
Utilizes a four-wavelength bidirectional OTDR for nondestructive measurement of chromatic dispersion and mode field diameter along an optical fiber.
2：Sample Selection and Data Sources:
A transmission link composed of different types of fibers (SMF and DCF) was used.
3：List of Experimental Equipment and Materials:
OTDR with four wavelengths (
4：31, 45, 55, and 625 μm). Experimental Procedures and Operational Workflow:
Acquiring OTDR backscattered power by bidirectional measurement, evaluation of longitudinal MFD, and estimation of waveguide and material dispersion contribution.
5：Data Analysis Methods:
Least square method for approximating the distribution of MFD derivative at wavelengths of interest.
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