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A comprehensive understanding of fiber optic connectors

A comprehensive understanding of fiber optic connectors
Optical fiber connectors are used most often to transmit light by connecting two optical
fibers instead of splicing. It is a flexible device that widely used in fiber-optic
communications systems. Optical fiber connectors ensure precisely connections between
the two ends of the fibers so that the optical energy output from the transmitting fiber can
be coupled to the receiving fiber to the maximum extent. Better connectors will have little
impact on the system due to its involvement. Since the outer diameter of the optical fiber is
the only 125um, and the light passing core is smaller. The cores of single-mode fiber are only
9um, and the multi-mode optical fiber has 50um and 62.5um. So it is important to ensure
the properly aligned.
Main component: Ferrule
One of the most important main components of fiber optic connector is ferrule. The quality
of the ferrule directly affects the precision connections of the two fibers. Ferrule is usually
made of different materials such as ceramic, metal or plastic. Most of the ferrules used in
optical connectors are made of ceramic material (zirconia) due to its hardened
characteristics, such as good thermal stability, high hardness, high melting point,
wear-resistance, and high processing precision. The inner diameter of the ceramic sleeve is
slightly smaller than the outer diameter of the ferrule, and the slitted sleeve tightens the two
ferrules for precise alignment.
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In order to make the end faces of the two fibers better contact, the ends of the ferrules are
usually poshing into different structures. PC, UPC, and APC are the polish styles of ferrules
inside the fiber optic connectors. PC is Physical Contact. The two end faces are polished to
be slightly cur ved or microspherical, and the fiber core is at the highest point of the bending.
This eliminates the air gap and forces the fibers into physical contact. APC is Angled Physical
Contact. The end face of APC is usually ground into an 8-degree angle. The 8° angled bevel
makes the fiber end face tighter and reflects light through its beveled angle to the cladding
instead of returning directly to the source, providing better connection performance. UPC
(Ultra Physical Contact) is based on the PC to optimize the end face polishing and surface
finish, the end face looks more dome-shaped. Connector connections need to be in the
same end face structure, for example, APC and UPC cannot be combined, resulting in poor
connector performance.
Basic parameters: insertion loss, return loss
Due to the different ferrule end faces, the performance of the connector loss is also different.
The optical performance of fiber optic connectors is primarily measured by two basic
parameters: insertion loss and return loss. So what is the insertion loss? Insertion Loss ("IL")
is the loss of optical power caused by the connection. It is mainly used to measure the
optical loss between two fixed points in optical fiber, which is usually caused by the
transverse deviation between two optical fibers, the longitudinal gap in optical fiber joints,
the end mass, etc. The unit is expressed in decibels (dB). Lower the insertion loss, better the
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performance. The general requirement should be no more than 0.5dB.
Return Loss ("RL") refers to the parameter of signal reflection performance. It describes the
power loss of optical signal return/reflection. The value is usually expressed in decibels (dB).
The larger, the better. The typical RL value of APC connector is about -60db, and that of PC
connector is about -30db.
Except for the two optical performance parameters of insertion loss and return loss, there is
also another parameters should be considered including the interchangeability, repeatability,
tensile strength and operating temperature of the fiber optic connector.
Fiber optic connector types
There are various fiber connector types in the market, such as LC, SC, FC, ST, MU, MT,
MPO/MTP and so on.
LC connector
The LC optical connector is made with an easy-to-use modular jack (RJ) latch mechanism.
The size of the pins and sleeves used in the LC connector is 1.25 mm, which is the half-size of
SC, FC, etc..
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SC connector
SC fiber optic connector ( ‘ Subscriber Connector ’ or ‘ Standard Connector ’ ) is a snap-on
standard square connector, which features a push-pull coupling mechanism, and does not
need to be rotated. This type of connector is usually made of engineering plastics, which are
inexpensive and easy to insert and remove.
FC connector
FC fiber connector (Ferrule Connector) and the SC connector are the same sizes, except that
the FC is made of a metal sleeve and the fastening method is a turnbuckle. It has the
advantages of simple structure, convenient operation, easy manufacture, and durability, and
can be used in a high vibration environment.
ST connector
The ST fiber optic connector (Straight Tip) has a rounded outer that made by a 2.5mm
ring-shaped plastic or metal. The bayonet-style keyed coupling mechanism, which is
commonly used in fiber distribution frames.
MTP/MPO connector
The MTP/MPO fiber optic connector is a special type of multi-fiber connector. The structure
of the MPO connector is complex, connecting 12 or 24 fibers in a rectangular fiber ferrule.
In addition to the above, the connector types include MU connectors, MT connectors, MTRJ
connectors, E2000 connectors, etc. Due to low cost benefit, SC connector is probably the
most commonly used fiber optic connector. LC fiber optic connectors are also a commonly
used fiber optic connector, especially for connection to SFP and SFP+ fiber optic transceivers.
FC connector is mostly used in single mode and is relatively rare in multimode fiber. Complex
designs and the metal housing makes it more expensive. ST fiber optic connectors are
typically used in long and short range applications such as campus and architectural
multimode fiber applications, enterprise network environments, and military applications.
Choosing the appropriate connector for a fiber network depends on things such as, network
design and function. HYC (HYC Co., Ltd)offers a variety of fiber optic connectors of various
Tel: 0755-81489797(Shenzhen)
Web: http://www.hyc-system.com
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