Fiber Optic Patch Cables With Different Fiber Optic Connectors


Fiber optic patch cable can be also classfied by the types of fiber optic connector. For example, LC fiber optic patch cable is named as it is with LC connector. Similarly, there are SC, ST, FC, MT-RJ, E2000, MU and MPO/MTP fiber optic patch cables. What’s more, there are PC, UPC, APC type fiber patch cords, which are differentiated from the polish of fiber connectors.
LC Fiber Optic Patch Cable
LC fiber optic patch cable (LC fiber cable)is terminated with LC connector. LC is the short form of Lucent Connector. LC connector is a push and latch structure, with plastic housing and accurate 1.25mm ceramic ferrule. LC type is a popular kind of small form fiber optic patch cable which reduce the space and it is widely used for densely installation. The LC fiber patch cables use a 1.25 mm ferrule, half the size of the ST patch cable. It has good performance and is highly favored for single mode patch cord. LC fiber patch cables comply with IEC, Telcordia, ANSI/EIA/TIA .The connector of LC patch cable is used on 1.6mm/2.0mm as well as 3.0mm cable. There are LC/PC (for multimode), LC/UPC and LC/APC (for single mode) patch cables.
SC Fiber Optic Patch Cable
SC fiber optic patch cable is terminated with SC connector. The SC connector was invented by the Japanese company NTT. SC stands for Subscriber Connector or Square Connector or Standard Connector. It is extremely common in datacom and telecom fiber optic market. It has a push and pull type and can be used for 1000 mating cycles. SC fiber optic patch cable is with a locking tab on the cable termination and provides for accurate alignment through their ceramic ferrules. It has an advantage in keyed duplexibility to support sending and receiving channels. SC fiber optic patch cable features low cost, simplicity as well as good durability. It is the most cheapest type, convenient to use and cost saving. SC fiber optic patch cable is widely used in fiber optic networks and can be with zirconia sleeve and plastic housing.
ST Fiber Optic Patch Cable
ST fiber optic patch cable (ST fiber cable)is terminated with ST connector. ST stands for Straight-Tip and features a Bayonet twist locking mechanism. ST connector has 2.5mm diameter ferrule as in SC connector. It was developed by AT&T and was very popular in the 1980s and 1990s. ST connector has bayonet-style housing and a long spring-loaded ferrule hold the fiber. It is available in both multimode and single mode versions. Horizontally mounted simplex and duplex adapters are available with metal or plastic housing, with a choice of phosphor bronze or zirconia split sleeve. Although there are plastic housing ST connectors, more and more people tend to use metal housing ST. ST fiber optic patch cable has straight tip type terminations and is easy to insert and remove. If you experience high light loss, try to reconnect it. It is rated for 500 mating cycles. ST fiber optic patch cable is one of the older generations, but it is still widely used for multimode networks, including LANs for buildings and campuses.
FC Fiber Optic Patch Cable
FC fiber optic patch cable is terminated with FC connector, a screw type connection. FC stands for Fixed Connector. Same as SC connector, FC is also invented by NTT. FC is with metal housing, screw structure. FC connector ferrule and sleeves used in FC adaptor are both same as SC ones. FC fiber optic patch cable is available in both single mode and multimode versions. It is applied in high-vibration environment and can screw on firmly, but you need to have the key aligned in the slot properly before you tighten it.
MTRJ Fiber Optic Patch Cable
MTRJ fiber optic patch cable is terminated with MTRJ connector. MTRJ stands for Mechanical Transfer Registered Jack. MTRJ connector is developed from MT and RJ connectors. It is with plastic housing and plastic ferrule and features two-fiber connection, that is to say, two fiberglass connection within one MTRJ fiber optic connector. MTRJ connectors use molded MT ferrules originated by NTT. Each MTRJ connector houses two fibers (duplex) and the footprint resembles copper RJ45 Ethernet connector. It is half the size of a SC connector and contributes to the price drop per fiber port on fiber-to-the-desktop solutions. MTRJ connectors come in male (with two metal pins) and female (no pins). MTRJ fiber optic patch cable has female type and male type. The difference between them is that the male type is with two pins on each of the MTRJ connector. The MTRJ patch cable is commonly used for networking applications. Its size is slightly smaller than a standard phone jack and is easy to operate.
E2000 Fiber Optic Patch Cable
E2000 fiber optic patch cable is terminated with E2000 connector. E2000 connector has a spring-loaded shutter used to protect the ferrule from dust and scratches. With similar structure of SC connector, it is smaller. E2000 fiber optic patch cable is one of the latest style yet one of the most expensive optical patch cord.
MU Fiber Optic Patch Cable
MU fiber optic patch cable is terminated with MU connector. MU connector is also the invention of NTT. It is with plastic housing and a push pull structure. MU connector is also a small form-factor connector which features a 1.25mm diameter ferrule as in LC connector. MU connector has the same push-pull locking mechanism as SC connector. MU fiber optic connector is similar size of LC and sometimes named small-SC. MU connectors are used in advanced optical transmission, exchange, and subscriber systems or high speed data application. MU fiber optic patch cable is developed to replace SC in the future.
MPO/MTP Fiber Optic Patch Cable
MPO fiber optic patch cable is terminated with MPO connector. The MPO is an high-density multi-fiber connector built around precision molded MT ferrule. It is a push-pull connector compliant IEC 61754-7 and TIA/EIA 604-5A and offers low cost per termination for high density applications. It is usually used in ribbon fiber optic patch cables or ribbon fan out multi fiber assemblies. MPO has multi fiberglass core inside each single connector, that is to say, there are several fiberglass connections in each single MPO fiber optic patch cable, for example, 12 fiber, 24 fiber, 36 fiber, etc. MTP is upgrade version of MPO. MTP fiber optic patch cable allows high-density connections between network equipment in telecommunication rooms. It uses a push-pull latching mechanism for easy and intuitive insertion and removal.
MPO patch cord (Ribbon fan out Fiber patch cord, Ribbon mliti cable fan out) use MTP and MPO multi fiber type connectors, each one of the connector are used with ribbon type fiber optic cables which contain multi fiber in one single jacket, so that MPO Fiber Patch Cord greatly save space and are very convenient to use. Based on single ferrule MT technology, the MPO Fiber Patch Cord assemblies provide up to 72 fiber connections in a single point, reducing the physical space and labor requirement, while providing the same bandwidth capacity of a multi-fiber cable with individual fiber connector terminations per cable. Typical MPO fiber optic patch cable assemblies are MPO to 8 LC, MPO to 12 MTRJ, etc. MPO fiber optic patch cable is also available by single mode and multimode, PC and APC polish. fiber-mart MPO fiber patch cables are available in 12, 24, 36, 48, 72, 96 and 144 fiber versions, PC and APC finishes, and support both multimode and single mode applications.


The Typle and Introduction of Fiber Optic Connector


According to the different transmission, fiber optic connector can be divided into singmode and multimode silicon-based fiber optic cable, and fiber optic cable in plastic transmission medium. According to the connector structure can be divided into FC,SC,ST,LC,D4,DIN,MU and etc. Wherein ST fiber optic connector is commonly used wiring device side, such as Fiber Optic Patch Cords panels, fiber optic module. While SC and MT connectors are typically used for network equipment side. By the shape of the fiber end face, it can be divided into FC,PC(including SPC or UPC) and APC,according to the number of fiber core, it can be divided into  singlecore and multicore (eg MT-RJ).Fiber optic connectors are widely used variety. In actual application process, we generally follow different fiber connector structure to distinguish it. The following are some of the more common optical connector:
FC fiber optic connectors: Strengthening way is to use an external metal sleeve, fastening means for the turnbuckles. Generally adopt ODF side(Mostly used one the patch panel).
ST fiber optic connectors: Commonly used in fiber optic patch panels, rounded shell, fastening means for the turnbuckles.(Commonly used in fiber optic patch panel).
SC fiber optic connectors: Connected with GBIC optical modules connector, its casing is rectangular, fastening means is a latch type using pin plug, do not need to rotate.(Mostly used in Switch Router).
LC fiber optic connectors: Connected with SFP module connector, it uses easy operation made modular jack (RJ) latch mechanism
MT-RJ:Square transceiver fiber optic connectors, one pair of fiber transceiver.
The fiber jumpers from fiberstore use smaller concentricity error and inner diameter high-precision ceramic ferrule,as well provides additional insertion loss and return loss, in order to avoid damage to the transmission optical transceiver device. We use advanced technology and grinding equipment, ensure the grinding fiber center offset, depression and end radius of curvature of ceramic fiber. Our Technical parameters are in line with the required standards. Fiberstore ensure the long-term use of the connector, not only for the joints and back reflection attenuation test, but aslo the use of scratches or blemishes precision interferometer test the joint surface, measurements taken FC, ST, SC, LC and MU-type connector of the radius of curvature, ground offset amount of the optical fiber and the projecting amount of depression, in order to ensure the quality of the joint.


Things You Should Know about Fiber Optic Connector Polishing


Optical fiber is utilized for high-speed and error-free data transmission across connector assemblies. So the connector end faces need to be polished to optimize performance. And also the connectors must follow acceptance criteria related to insertion and back reflection loss as well as end-face geometry specifications. This article will talk about the fiber optic connectors polishing.
Polishing Process
Early physical contact connectors required spherical forming of their flat end faces as part of the polishing procedure. It involved a four-step process: epoxy removal, ferrule forming, and preliminary and final polishing. These steps utilized aggressive materials for epoxy removal and ferrule forming, generally accomplished with diamond polishing films. Now the polishing process has developed into a sequence of epoxy removal, followed by rough, intermediate and final polishing cycles because almost all connectors are manufactured with a pre-radiused end face. One goal is to avoid excessive disruption of the spherical surface,
while still producing a good mating surface.
Polishing Specifications
Polishing specifications for fiber connectors fall into two categories related to performance and end-face geometry. Back reflection and insertion loss specifications are the most critical measures of polished end functionality. The insertion loss is the amount of optical power lost at the interface between the connectors caused by fiber misalignment, separation between connections (the air gap) and the finish quality of each connector end. The current standard loss specification is less than 0.5 dB, but less than 0.3 dB is increasingly specified. Back reflection is the light reflected back through the fiber toward the source. High back reflection can translate to signal distortion and, therefore, bit errors in systems with high data transfer rates.
Polishing Material
Today several types of connectorized fibers are available, the most common of which are 2.5 mm, 1.25 mm and multifiber. Connector end faces must first be air-polished to ensure a proper mating surface. This will be followed by a sequence of polishing steps depending on the type of connector, the back reflection and the insertion loss specifications. Regardless of the connector type, most polishing sequences begin with aggressive materials, including silicon carbide to remove epoxy and diamond lapping films for beginning and intermediate polishing. These remove both surrounding material and fiber at the same rate. But the last polishing step needs a less aggressive material to attack only the fiber, such as silicon dioxide. Using a material for final polishing that is too aggressive could result in excessive undercut. The wrong final-polish material can cause excessive protrusion, leading to fiber chipping and cracking during the connector mating process.
Impact Factor
Issues to be examined include the polishing films used, the type of epoxy and lubrication. Films are the most significant impact because the gradations and quality vary from supplier to supplier. End users should pay attention on selecting film type. Excessively aggressive films can destroy a 125-μm fiber and the end-face radius. Epoxy removal is also essential to contamination-free polishing. Some types of epoxies can be removed more easily with specific grades of silicon-carbide polishing films. The films to use in this step depend on the size of the epoxy bead mounted on the connector end face and the epoxy type. Epoxies have different varieties. Some will be tacky, some firm. In all, a contamination-free environment is essential to optimizing connector polishing.
Polishing may be an old art form, but for the immediate future, it’s here to stay. Undoubtedly inspection criteria will increase. Polishing procedures will be driven to change, and new connector style will also make us continuously strive to reinvent our approach to polishing. Fiberstore has various products about fiber optic polishing. For more details, please visit fiber-mart.COM.


How to clean a fiber optic connector?

Do you know how important is to maintain a fiber connector clean? In fact, having a clean eviroment for the connector is one of the most important procedures in the conservation of a fiber optic system. This is necessary to keep quality connections.
If any particle of dust, lint, oil or any other dirt get on the end of the connector, this will interrupt the correct function of the signal that is being sent over the fiber.
An improper maintenance of the cables can also cause other problems such as scratching the glass surface, instability in the laser system, and a misalignment between the fiber cores.
So, the questions is: What to do to clean my fiber optic? Simple:
Before beginning all the process, make sure the cable is disconnected from both ends and turn off any laser sources. Don’t forget to wear safety glasses and check the connectors before you clean them.
Step 1: Inspect the fiber optic connector, component, or bulkhead with a fiberscope.
Step 2: If the connector is dirty, clean it with a dry cleaning technique. This procedure consists of using a reel-based cassette cleaner with medium pressure, wipe the connector end face against a dry cleaning cloth in one direction. This step must be done in both parts of the fibre optic and can be repeated at least two times.
Step 3: If the connector is still dirty, clean it with a wet cleaning technique followed immediately with a dry cleaning in order to ensure no residue is left on the end face. You can use a special solution for fibre optic or 91% Isopropyl Alcohol. Wipe the end face against the wet area and then onto a dry area to clean potential residue from the end face.
Wet cleaning is more aggressive than dry cleaning, and will remove airborne contamination as well as light oil residue and films.
Similar to the dry cleaning method, this one, can be done twice if you consider that the fiber optic isn’t clear yet.
IMPORTANT: The end face of the connector should never be touched during the cleaning process and also the clean area of a tissue should not be touched or reused.
The fiber end should be inspected with a fiberscope of at least 200x magnification, and if it is contaminated, it should be cleaned with one of the methods explained before.
DO’s and DON’Ts when it comes to cleaning a Fiber Optic:
Turn off any laser sources before you inspect fiber connectors, optical components, or bulkheads.
Make sure that the cable is disconnected at both ends and the card or pluggable receiver is removed from the chassis.
Wear the appropriate safety glasses when required in your area. Be sure that any laser safety glasses meet federal and state regulations and are matched to the lasers used within your environment.
Inspect the connectors or adapters before you clean.
Use the connector housing to plug or unplug a fiber.
Keep a protective cap on unplugged fiber connectors.
Store unused protective caps in a resealable container in order to prevent the possibility of the transfer of dust to the fiber. Locate the containers near the connectors for easy access
Discard used tissues and swabs properly.
Use alcohol or wet cleaning without a way to ensure that it does not leave residue on the end face. It can cause damage to the equipment.
Look into a fiber while the system lasers are on.
Clean bulkheads or receptacle devices without a way to inspect them.
Touch products without being properly grounded.
Use unfiltered handheld magnifiers or focusing optics to inspect fiber connectors.
Connect a fiber to a fiberscope while the system lasers are on
Twist or pull forcefully on the fiber cable.
Reuse any tissue, swab, or cleaning cassette reel.
Touch clean area of a tissue, swab, or cleaning fabric.
Touch any portion of a tissue or swab where alcohol was applied.
Touch the dispensing tip of an alcohol bottle.
Use alcohol around an open flame or spark; alcohol is very flammable.

How To Clean The Fiber Optic Connector

Fiber optic cleaning is one of the most important thing in the process of fiber optic system maintenance, which is required to keep quality connections between fiber optic equipment. As we know, the fiber optic connector consists of fiber optic plug and the adapter. The ends of the fiber optic cables are held in the core of ferrule in the plug. Keeping the fiber end face and ferrule absolutely clean is very essential, since any particles such as dust, oil or lint on the end face of the fiber, it will disrupt the light transmission trough the fiber and lead to the completeness of optical signals for the component or the entire system.
For proper performance of the SC fiber optic cable, you must keep the SC connector clean and free of dust. Small micro-deposit of oil and dust in the canal of the connector could cause loss of light, reducing signal power and possible causing intermittent problems with the optical connections. Below picture show the part of the end face of an unclean and clean ferrule of SC connectors.
What should be followed before the fiber optic cleaning
1.Before cleaning the fiber optic connectors, make sure to disconnect the fiber optic cables from both ends and then turn off any laser source.
2. Do not allow the end of the fiber optic cable to make contact with any surface including your fingers.
3.Never to bend the fiber cable, which will in turn cause internal breaks along the fiber and cause poor performance or instability.
4.Use the finger cots or powder free surgical gloves to handle the fiber optic cables.
5.Use fresh spectroscopic grade Methanol or Isopropyl Alcohol as the only cleaning solvent.
6. In the daily connection work, a connector housing should be used when plugging or unplugging a fiber. A protective cap should be used to cover the unplugged fiber connectors.
7. In the process of the fiber optic cleaning, the end face of the connector should never be touched and also the clean area of a tissue of swab should not be touched or reused.
Cleaning Procedure
At the beginning of cleaning job, a fiber microscope should be used to inspect the fiber end, if it is contaminated as either images shows below, it should be cleaned with the dry cleaning method.
1.Blow the fiber surface with a stream of Clean Dry Air (the so called CDA), which will dislodge larger, loose particles. Keep in mind, don’t tip the can of the CDA while blowing. Because the liquid may be released contaminant on the surface of the fiber.
2.Place 1-3 drops of spectroscopic grade methanol or isopropyl alcohol in the center of a lens tissue. Do not use Acetone as a cleaning solvent on the fiber optical surfaces. Besides, to ensure the purity of the methanol or alcohol, you should never insert the lens tissue or swabs into the liguid.
3.Hold the fiber by the connector. Place the wet portion of the lens tissue on the optical surface and slowly drag it across. At this step, don’t use lens paper to dry it because the dry lens paper is extremely abrasive.
4.Examine the surface of the fiber under high density light using a magnifier, an optical loop, or a video inspection tool. If streaks or contaminants still remain, repeat the process using a fresh lens tissue.
5.Immediately install a protective cover over the end of the cable to avoid re-contamination or insert the fiber for immediate use.

Basic Knowledge of Fiber Optic Connector


Terminating the end of an optical fiber, the fiber optic connector is utilized to join optical fibers where a connect or disconnect capability is required. A optical fiber connector has three major components: the ferrule, the connector body and the coupling mechanism. Generally made from ceramic, metal or high quality plastic, the ferrule is a thin structure (often cylindrical) that holds the glass fiber. The connector body is a plastic or metal structure that holds the ferrule and attaches to the jacket and strengthens members of the fiber cable itself. And the coupling mechanism is a part of the connector body that holds the connector in place when it gets attached to another device.
Since the fiber cable transmits pulses of light instead of electrical signals, it is important to choose a good optical fiber connector that aligns microscopic glass fibers perfectly in order to allow for communication. Nowadays, there are many different types of fiber optic connectors in the market (as shown in the following figure). Different kinds of optical fiber cables may need different connectors. Seen from the types of optical fiber, the fiber optic connectors may be loosely classified into standard fiber optic connectors, small form factor fiber optic connectors and ribbon fiber connectors. These family types of fiber connectors sometimes may overlap with each other.
Fiber Optic Connector Types
Standard Fiber Optic Connectors
Generally having a ferrule of 2.5 mm, standard fiber optic connectors are connectors commonly used in the fiber network. They can be both simplex and duplex and available in single mode and multi-mode fibers. ST, FC, SC, FDDI and ESCON are all standard fiber connectors. But they also differ from each other. ST connector is the most popular connector for multi-mode fiber optic LAN applications. FC connector is specifically designed for telecommunication applications and provides non-optical disconnect performance. SC connector is widely used in single mode applications for its excellent performance. FDDI connector, which is a duplex multi-mode connector, utilizes two 2.5mm ferrules and is designed to used in FDDI network. ESCON connectors are similar to FDDI connectors, but contain a retractable shroud instead of a fixed shroud.
Small Form Factor Fiber Optic Connectors
To meet the demand for devices that can fit into tight spaces and allow denser packing of connections, a number of small form factor fiber optic connectors have been developed since the 1990s. In this type of small form factor fiber optic connectors, some are miniaturized versions of older connectors, built around a 1.25mm ferrule rather than the 2.5mm ferrule. For example, the LC, MU, E2000 connectors. While the others are based on smaller versions of MT-type ferrule for multi-mode fiber connections, or other brand new designs. For example, the MT-RJ connector, which has a miniature two-fiber ferrule with two guide pins parallel to the fibers on the outside. Its overall size is about the same as an RJ45 connector.
Ribbon Fiber Connectors
MTP and MPO are compatible ribbon fiber connectors based on MT ferrules which allow quick and reliable connections for up to 12 fibers. Since the MTP product complies with the MPO standard, the MTP connector is an MPO connector. Along with the MTP patch cables (for example, MTP-MTP fiber trunk cable), MTP connectors can upgrade the 10G network to 40G/100G.
The optical fiber connector is an essential part of fiber optical network. As the popularity of fiber optical network, about 100 fiber optic connectors have been introduced to the market. As the main professional fiber optic products supplier in China, offers various kinds of fiber cable connectors, especially the commonly used FC, LC, SC, ST and MPO connectors.

New Application of Fiber Optic Connector Assembly at the Scene


Recent years, PON technology has been more widely used in the fiber optic industry because of its advantages on building cost, protection cost and the broad width. And in China, the three major telecom operators – China telecom, China unicom and China mobile all bring the EPON and GPON into the telecommunication network, at the same time, in order to support the application of PON technology, ODN network is built strongly, then it put forward higher requirements to fiber optic connection, protection as well as the application and management of fiber cable devices, the most obvious device among them is fiber optic patch cable.
We all know that tradition fiber patch cables are made to follow as the certain length of fiber optic connector assembly process, different lengths of fiber cables and connectors composed of a wide variety of fiber patch cords, they can be used in fiber optic patch panels, fiber transfer boxes, fiber cable devices and the connection between the devices and other optical ports, but just because these different fiber patch cables, it bring heavy pressure to storage management. Except this, traditional factory custom the length of fiber patch cables usually more than the actual length if the route and it leaves the length of the excess in a small disk space, we can see from the figure that not only it adds the cost of distribution frame and other cable devices but also not easy to manage, and too longer fiber cables always happens intertwined, knotted squeeze and circumstances, then result in unnecessary trouble, increase the cost of maintenance and management.
Therefore, how to control the length of fiber patch cables effectively, to avoid all the trouble. To solve the problem, Fiberstore makes his opinion. we use the on site assembly of fiber connectors, and on the 2 mm or 3 mm fiber pigtail?into end and make fiber patch cable at the scene, replacing the traditional custom factory fiber patch cables, it can greatly alleviate the traditional fiber patch cables left too long, difficulties of managements, frequent failure those a series of maintenance problems. Fiberstore comes with the close communication with all the operators and joint efforts, apply the fiber optic connector assembly of FTTH at the secne into fiber patch cables managements of fiber equipments.
After the constant experiments and used for many time successfully, we have to believe that the embedded optical fiber types of fiber optical connector assembly at the scene will be the first choice for the fiber distribution frame, cable box, optical distribution boxes and other cable device in the future, it also can give ODN network cabling system maintenance and management to bring a revolutionary change.