研究目的
Investigating the dependence of macro-bending loss on bending configuration of multimode optical fibers using ray-tracing simulation.
研究成果
The macro-bending loss of multimode step-index fibers depends on their configuration as well as their radius of curvature. Reporting or comparing macro-bending loss without specifying the fiber configurations is not accurate. The macro-bending loss of step-index multimode fibers is highly nonlinear, which implies that analytically relating a single value of bending loss to a specified bending radius might be futile.
研究不足
The refractive index of the fiber core and cladding is assumed homogeneous and all curved fibers are assumed to have no bending stress. This might lead to a certain amount of error in the loss calculation. The study focuses on the uniform distribution of the input light over the cross section of the fiber core, and adjusting the distribution will change the results of macro-bending loss.
1：Experimental Design and Method Selection:
Ray-tracing simulation is conducted using the commercial optical design and analysis suite TracroPro (version 2018, Lambda Research Corporation). Three-dimensional models of multimode optical fibers in various configurations are created by Solidworks (version 2013, Dassault Systèmes) and imported into TracePro, and material properties are set. Then, input light rays are created and simulation parameters are adjusted to run ray-tracing simulations. After each simulation is completed, the output power from the other end of the fiber is read and the corresponding attenuation is calculated.
2：Sample Selection and Data Sources:
The diameters and refractive indices of the simulated fiber core and cladding are 980 and 1000 μm, and 1.49 and 1.40, respectively, the same as those of typical commercial POFs. The calculated numerical aperture (NA) of the fiber is 0.
3：49 and 40, respectively, the same as those of typical commercial POFs. The calculated numerical aperture (NA) of the fiber is List of Experimental Equipment and Materials:
5.
3. List of Experimental Equipment and Materials: Commercial optical design and analysis suite TracroPro (version 2018, Lambda Research Corporation), Solidworks (version 2013, Dassault Systèmes).
4：Experimental Procedures and Operational Workflow:
The number of input light rays is set to 200 for all simulations. The flux threshold is set to be 10–4. Input light rays are randomly distributed over the cross section of the fiber core, and all rays have the same flux. The initial propagation angles of rays are also randomly distributed within the maximum angle (20°) allowed by the NA of 0.
5：Input light rays are randomly distributed over the cross section of the fiber core, and all rays have the same flux. The initial propagation angles of rays are also randomly distributed within the maximum angle (20°) allowed by the NA of Data Analysis Methods:
5.
5. Data Analysis Methods: The output power from the other end of the fiber is read and the corresponding attenuation is calculated.
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