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Fiber Optic Connectors

SC fiber optic connector basic structure

More than a dozen types of fiber optic connectors have been developed by variousmanufacturers since 1980s. Although the mechanical design varies a lot among differentconnector types, the most common elements in a fiber connector can be summarized in thefollowing picture. The example shown is a SC connector which was developed by NTT(Nippon Telegraph and Telephone) of Japan.

A SC Connector Sample

SC Connector Structure

Elements in a SC connector

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1. The fiber ferrule.

SC Connector Fiber Ferrule

SC connector is built around a long cylindrical 2.5mm diameter ferrule, made of ceramic(zirconia) or metal (stainless alloy). A 124~127um diameter high precision hole is drilled inthe center of the ferrule, where stripped bare fiber is inserted through and usually bonded byepoxy or adhesive. The end of the fiber is at the end of the ferrule, where it typically ispolished smooth.

2. The connector sub-assembly body.

The ferrule is then assembled in the SC sub-assembly body which has mechanisms to holdthe cable and fiber in place. The end of the ferrule protrudes out of the sub-assembly body to

mate with another SC connector inside a mating slave (also called adapter or coupler).

3. The connector housing

Connector sub-assembly body is then assembled together with the connector housing.Connector housing provides the mechanism for snapping into a mating sleeve (adapter) andhold the connector in place.

4. The fiber cable

Fiber cable and strength member (aramid yarn or Kevlar) are crimped onto the connectorsub-assembly body with a crimp eyelet. This provides the strength for mechanical handing of

the connector without putting stress on the fiber itself.

5. The stress relief boot.

Stress relief boot covers the joint between connector body and fiber cable and protects fibercable from mechanical damage. Stress relief boot designs are different for 900um tightbuffered fiber and 1.6mm~3mm fiber cable.

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How fiber optic connectors mate

FC connectors mating

Unlike electronic connectors, most fiber optic connectors dont have jack and plug design.Instead a fiber mating sleeve (adapter, or coupler) sits between two connectors. At the centerof the adapter there is a cylindrical sleeve made of ceramic (zirconia) or phosphor bronze.Ferrules slide into the sleeve and mate to each other. The adapter body provides mechanism

to hold the connector bodies such as snap-in, push-and-latch, twist-on or screwed-on. Theexample shown above are FC connectors with a screwed-on mechanism.

Fiber Optic Connector Types and their applications

Both examples shown above are for single fiber cable (simplex) which is easy to install.However there are also duplex and multi-fiber connector designs. Below are loosely dividedfamily types of fiber connectors which sometimes overlap.

Standard fiber optic connectors 2.5mm ferrule

ST connector simplex only, twist-on mechanism. Available in single mode and multimode.

It is the most popular connector for multimode fiber optic LAN applications . It has a long2.5mm diameter ferrule made of ceramic (zirconia), stainless alloy or plastic. It mates with ainterconnection adapter and is latched into place by twisting to engage a spring-loadedbayonet socket.

ST Connector ST Adapter (mating sleeve)

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FC connector simplex only, screw-on mechanism. Available in single mode andmultimode.

FC connector also has a 2.5mm ferrule (made of ceramic (zirconia) or stainless alloy) . It isspecifically designed for telecommunication applications and provides non-optical disconnectperformance. Designed with a threaded coupling for durable connections. It has been the

most popular single mode connectors for many years. However it is now gradually beingreplaced by SC and LC connectors.

FC Connector

SC connector simplex and duplex, snap-in mechanism. Available in single mode andmultimode.

SC was developed by NTT of Japan. It is widely used in single mode applications for itsexcellent performance. SC connector is a non-optical disconnect connector with a 2.5mmpre-radiused zirconia or stainless alloy ferrule. It features a snap-in (push-pull) connectiondesign for quick patching of cables into rack or wall mounts. Two simplex SC connectors canbe clipped together by a reusable duplex holding clip to create a duplex SC connector.

Simplex SC Connector Duplex SC Connector

Simplex SC Adapter Duplex SC Adapter

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FDDI connector Duplex only, multimode only.

FDDI connector utilizes two 2.5mm ferrules. The ferrules are sheltered from damagebecause of the fix shroud that has been constructed in the FDDI connector. FDDI connectoris a duplex multimode connector designed by ANSI and is utilized in FDDI networks. FDDIconnectors are generally used to connect to the equipment from a wall outlet, but the rest ofthe network will have ST or SC connectors.

FDDI Connector

LC connector simplex and duplex push and latch 1.25mm ferrule. Available in singlemode and multimode.

Externally LC connectors resemble a standard RJ45 telephone jack. Internally they resemblea miniature version of the SC connector. LC connectors use a 1.25mm ceramic (zirconia)ferrule instead of the 2.5mm ferrule. LC connectors are licensed by Lucent and incorporate apush-and-latch design providing pull-proof stability in system rack mounts. Highly favored forsingle mode applications.

LC Connector Simplex and Duplex

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LC Simplex Adapter LC Duplex Adapter

MU connector simplex, duplex snap in, 1.25mm ferrule.

MU connectors and adapters were developed by NTT, and have push-pull mechanism. Theyare called mini SC and are more popular in Japan. Applications include high-speed datacommunications, voice networks, telecommunications, and dense wavelength divisionmultiplexing (DWDM). MU connectors are also used in multiple optical connections and as aself-retentive mechanism in backplane applications.

MU Connector Simplex and Duplex

MU Adapter Simplex MU Adapter - Duplex

E2000 connector. 1.25mm ferrule, snap-in mechanism. Also called LX.5 connector.Available in single mode and multimode.

Externally a E2000 connector looks like a miniature SC connector. The connector is easy toinstall, with a push-pull latching mechanism which clicks when fully inserted.

It features a spring-loaded shutter which fully protects the ferrule from dust and scratches.The shutter closes automatically when the connector is disengaged, locking out impuritieswhich could later lead to network failure, and locking in potentially harmful laser beams.When it is plugged into the adapter the shutter opens automatically.

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E2000 Connector

E2000 Adapter

MT-RJ connector, duplex only, multimode only. (not 1.25mm ferrule, but rather a two-fiberferrule design derived from MT). Overall size is about the same as a RJ45 connector.

MT-RJ connector is derived from MT ferrule design. It has a miniature two-fiber ferrule withtwo guide pins parallel to the fibers on the outside. The guides pins align ferrules preciselywhen mating two MT-RJ connectors. MT-RJ connectors are designed with male-femalepolarity which means male MT-RJ connector has two guide pins and female MT-RJconnector has two holes instead.

MT-RJ connectors are used in intrabuilding communication systems. Since they aredesigned as plugs and jacks, like RJ-45 telephone connectors, adapters can be used withsome designs, but are not required for all.

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MTRJ Connector

MTRJ Adapter

VF-45 connector(3M Volition), duplex only. No ferrules at all. Plug and jack versions.

VF-45 (3M Volition) is designed by 3M. VF-45 features plug and jack design without the needof adapters. VF-45 plug is inserted into the socket(jack) at a 45 degree angle, pressing a pairof fibers into V-grooves inside the socket. This design eliminates the need for expensiveferrules thus reduces connector costs.

3M VF45 (Volition) Connector and Adapter

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Opti-Jack connector. Duplex only. 2.5mm ferrule. Plug and jack version.

Opti-Jack connector is a version ofFiber Jack connector design from Panduit Corporation,that provides a snap-lock plug and socket for a pair of fiber cables. It enables fibers to bequickly plugged and removed in a manner similar to RJ-45 connectors. It is designed aroundtwo ST-type 2.5mm ferrules in a package the size of a RJ-45.

Fiber Jack is a duplex fiber-optic connector standardized by the TIA (FOCIS-6). TIA standsfor Telecommunications Industry Association. Fiber Jack allows two fibers to mate in a snap-lock type of plug and socket similar in size and convenience to an RJ-45 connector.

Ribbon Fiber Connector (multiple fiber connectors, 4~12 fibers). Availablein single mode and multimode.

MTP and MPO connector

MTP and MPO are compatible ribbon fiber connectors based on MT ferrule which allow quickand reliable connections for up to 12 fibers. They are intended for installations that requiremany fiber connections. Up to 12 fibers in a ribbon are stripped to 125um cladding andinserted into 250um spaced parallel grooves. The ferrule also includes two 0.7mm diameterholes, running parallel to the fibers on the outer side of the ferrule. These two holes holdprecision metal guide pins which align the fibers with tight tolerances.

MTP and MPO connectors feature male and female connector design. Male connectors havetwo guide pins and female connectors do not. Both connector types need an adapter to matea pair of male and female connectors.

Because MTP and MPO connectors are trying to align so many fibers at once, their couplingloss are typically bigger than single fiber connectors.

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MTP MPO Connector

MTP MPO Adapter

Other types

SMA 905 and SMA 906 connector. Simplex only. Multimode only.

SMA 905 and 906 connectors make use of threaded connections and are ideal for militaryapplications because of their low cost multimode coupling.

SMA 905 and SMA 906 multimode connectors are available with stainless alloy or stainlesssteel ferrules. The stainless alloy ferrule may be drilled from 125um to 1550um to acceptvarious fiber sizes.SMA 906 ferrule has a step, as shown in the following picture, which requires a half sleeve tobe installed when mating a SMA 906 connector with SMA 905 mating sleeves.

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SMA 905 and 906 Connector

SMA 905 Adapter

Biconic Connector. Simplex only. Available in single mode and multimode.

Biconic connectors exhibit a cone-shaped ferrule that helps to align the optical fibers at theconnection interface. Their robust design makes biconic connectors well-suited for militaryfiber optic applications. Fiber Connections terminates biconic connectors on either singlemode or multimode fiber optic cable. The ferrule can be made with either polymer or metal.

Biconic connectors applications include LAN and premises networks, data processingsystems, medical instrumentation, remote sensing, telemetry, and cable television.

Biconic Connector

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D4 connector. 2.5mm ferrule. Screw-on. Simplex only.

D4 connectors are made from a 2.5mm diameter ceramic (zirconia) ferrule for durability.They have a high-performance threading mounting system and a keyed body for

repeatability and intermateability.

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from indoor use, typically allowing entry not to exceed 50 feet.

Indoor/Outdoor Dry Loose Tube Fiber Optic Cable

This cable is suitable for both indoor and outdoor applications. One advantage of

this cable is that it eliminates the need for a splice or connector at the pointwhere the cable transitions between an outdoor and indoor environment.

3. Aerial/Self-Supporting

Figure 8 Fiber Optic Cables (Aerial/Self-Supporting Fiber Cables)

Figure 8 (aerial/self-supporting) fiber cables are designed to be strung from polesoutdoors and most can also be installed in underground ducts. They haveinternal stress members of steel of steel or aramid yarn that protect fibers fromstress.

Aerial cable provides ease of installation and reduces time and cost. Figure 8cable can easily be separated between the fiber and the messenger.

Temperature range -55 to +85C.

4. Direct-buried

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