Fiber core misalignment issue in optical cable splicing
Axial misalignment happens when the cores of two fibers do not line up perfectly. Routine calibration of cleaving tools and maintaining a cleave angle below 1°. This has the effect of negating Fresnel reflection losses and reduces mode-field mismatch because the guidance properties across the join change more. You want low splice loss because signal loss can weaken communication and reliability.
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