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Fiber optic jumper connectors used in fiber optic communication and sensing engineering must be fitted with a dust cap (Dust Cap) when not in use. From the perspective of optical engineering and physical principles, this operation is decisive in maintaining the physical integrity and transmission performance of the entire optical system, mainly for the following reasons:
1. Contamination Effects at the Micrometer Scale (Contamination Prevention)
- Extremely Small Core Size: Taking the common single-mode fiber (SMF), such as G.652D, as an example, the diameter of the core transmitting optical signals is only about 9 micrometers (\mu m).
- Relative Size of Dust Particles: The size of airborne dust, skin debris, or even oil droplets typically ranges from a few micrometers to tens of micrometers, which is much larger than or equivalent to the core of a single-mode fiber.
- Optical Impact: When the connector end face is exposed to the air, dust easily adheres to the core area of the ferrule end face. Once an uncleaned connector is inserted into an adapter for mating, particles will severely scatter or absorb the optical signal, leading to a sharp increase in insertion loss (Insertion Loss, IL) and a significant deterioration of return loss (Return Loss, RL), causing link communication failures.
2. Physical Protection of Precision-Polished End Faces (Physical Damage Prevention)
- Geometric Contact Requirement: The zirconia ceramic ferrule end faces of fiber optic connectors are subjected to extremely rigorous sub-micrometer precision polishing and grinding (such as the PC/UPC’s micro-spherical or APC’s 8° angled spherical surface) to ensure that the two fibers achieve