研究目的
To measure mode crosstalk between LP01 and LP11 modes in a two-mode fiber link using backscattered power.
研究成果
The proposed technique successfully measures mode crosstalk between LP01 and LP11 modes in a fiber link composed of different TMFs. It is validated experimentally and offers a simple approach that does not depend on the properties of mode couplers or other optical devices.
研究不足
The technique requires knowledge of optical losses of LP01 and LP11 modes, which must be measured separately. It assumes the backscattered capture ratio is the same for both modes (B0=B1=B). The method may be affected by properties of the mode couplers and other devices, but the paper claims it is simple and independent of these properties.
1：Experimental Design and Method Selection:
The technique uses an optical time domain reflectometer (OTDR) to measure backscattered powers of LP01 and LP11 modes. The mode coupling coefficient and launching power ratio are estimated from the power ratio distribution along the fiber length.
2：Sample Selection and Data Sources:
A fiber link composed of three types of two-mode fibers (TMFs) with specified parameters (e.g., mode field diameter, cutoff wavelength) is used.
3：List of Experimental Equipment and Materials:
OTDR with a wavelength of 1550 nm, pulse width of 200 ns, averaging time of 180 s, mode couplers, light source, detector, switch, and the TMFs.
4：Experimental Procedures and Operational Workflow:
LP01 mode light is launched into the fiber link via a mode coupler. Backscattered powers are measured through LP01 and LP11 ports using the OTDR. Optical losses are measured and used to correct the backscattered powers. The mode power ratio is calculated and used to estimate mode coupling coefficient and launching power ratio.
5：Data Analysis Methods:
The mode power ratio is analyzed using linear approximation to estimate the mode coupling coefficient. Mode crosstalk is calculated based on the estimated parameters.
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