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Introduction to Fibre Optics (III)


Most common types of connectors:
Below you will nd a short despription of the most commonly used connectors; they will be classied according to two basic characteristics:
  According to its physical structure: ST, SC, FC, LC connectors
  According to the bre polishing type: PC, UPC, APC connectors ST (straight tip)
This type of connector is an AT&T trademark. It features a bayonet mount with a long ferrule (ceramic, metal or plastic) that holds the ber. They are spring loaded so they must t perfectly.
When they cause much losses, it has to be separated and bound again.
SC (Straight Connection)
It is a snap-in type connector, very popular due to its excellent performances.
It latches by means of a push-pull action. It also exists in double version.

They are the most popular single-mode connectors.
They are connected by screwing on rmly.
In relation with the FC type it is necessary to take care for the correct alignment between socket and connector.
It is a new type of connector that uses a 1.25 mm ceramic ferrule.
It features a good performance and is ideal for single mode bre.

Type of connector's polishing
At the end of the ber some light can be reected causing a damage or reducing its useful life.

To avoid these problems the ber is cut in angle thus reducing the reflection.
PC (Physical Contact) type
When this angle was "handmade" having approximately 30º and featuring 30 dB ORL (optical return loss).
  UPC (Ultra Physical Contact)
When the cut was polished with a machine obtaining a super/ultra nishing featuring 40/50 dB ORL respectively.

  APC (Angled Physical Contact)
When more rejection is required this polishing features a 8º angle which guarantees more than 60 dB ORL.

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