Скачать или смотреть What is the Difference between Green Patch Cord and Blue Patch Cord | SC/UPC vs SC/APC | Loss Detail

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In this video, the difference between the two Important types of fiber connectors are explained SC / UPC and SC / APC.

Generally speaking, SC APC connector and SC UPC connector are distinct from each other based on fiber end face. SC APC connector is polished with an 8-degree angle, while SC UPC connector is polished with no angle, which causes difference in light reflection

SC APC vs SC UPC: What Are the Differences?
As mentioned above, we know SC APC and SC UPC varies from polishing style, which is a difference in the manufacturing process. But in the actual usage, what are the distinct features of SC APC and SC UPC connectors and how to choose from them? Here are some clues.

·Return Loss Value
With a SC UPC connector installed on the end of a fiber, reflected light is reflected straight back to the light source. However, with a SC APC connector, reflected light is reflected at an angle into the outer cladding layer rather than straight back towards the light source. This different way of reflection of reflected lights brings about different return loss value. SC APC connector is standardized with a return loss value as -60dB or higher, while SC UPC connector as -50dB or higher.

·Insertion Loss Value
Another specification to consider about fiber connector is insertion loss. Lower the insertion loss, better the performance. Someone prefer SC UPC connector, because they hold the view that SC UPC connector is easier to realize low insertion. This is true on account of less air gaps in SC UPC connector than SC APC connector. However, modern technique has made insertion loss value of SC APC connector as low as SC UPC connector.

·Applications
SC APC connector is commonly used in applications that are much more sensitive to return loss, and requires for high precision signal, such as FTTX (Fiber To The X), video delivery through RF signal, WDM (wavelength division multiplexing) applications and analogue equipment like CCTV. For applications less sensitive to return loss and no other particular demands are required, a SC UPC connector can work as equal effectively as a SC APC connector

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