12F AR Coated MPO MTP Trunk Cable

The non-contact structure prevents direct fiber-to-fiber contact, while the AR coating reduces the optical reflection introduced by the controlled air gap.

In a non-contact MPO/MTP interface, the recessed fiber end-faces remain physically separated after mating. The resulting air gap helps reduce end-face scratching and wear during frequent connection cycles, but it also introduces fiber-to-air boundaries into the optical path.

Because silica fiber and air have different refractive indices, a bare silica-to-air interface can reflect approximately 4% of the incident optical power. Reflections between the two opposing fiber surfaces may also form a Fabry–Perot cavity, potentially causing return-loss degradation, insertion-loss variation, and reduced measurement repeatability.

The anti-reflective coating is designed to reduce reflection at these fiber-air interfaces at the specified operating wavelength or wavelength range. By suppressing unwanted back reflection and limiting cavity interference, it helps the controlled air-gap connection maintain more consistent insertion loss and more repeatable optical performance.

Mechanical and optical functions work together: The recessed fiber structure prevents direct physical contact between the mating fiber tips, while the AR coating reduces the reflection introduced by the air gap. Together, these features provide a durable and optically stable reference interface for high-frequency parallel optical testing.