Connectors – Great Helpers in Fiber Optics

Nowadays, the effective utilization of fiber bandwidth has been made possible owing to various optical products of high quality. Take fiber optic patch cables for example, they allow for high-speed data transmission while ensuing data accuracy and transmission security. Certainly, the connectors, coupled with optical patch cables, function well in networking system. Maybe you are unfamiliar with optical connectors. The following passages will describe optical connectors in details.

An optical fiber connector terminates the end of an optical fiber, and enables quicker connection and disconnection than splicing. Fiber optical connectors are sophisticated devices and they serve as terminators at the end of fibers

An optical fiber connector composes of a ferrule and a body. A ferrule is intended to hold the ends of fiber. It is because of this thin structure that a fiber connector can couple and align the core of fibers. A body is generally in metal, ceramic, or plastic structure. This part attaches the connector to the jacket to achieve connection so that light can pass through the fibers.

Good coupling mechanism technologies are applied in the manufacturing process of optical connectors, which areendowed with several features:

• Low insertion loss
• High return loss (low amounts of reflection at the interface)
• Ease of installation and use
• Reliability
• Low environmental sensitivity

There are many kinds of optical connectors available in telecommunication market. MPO, MTP and ST are three widely used connectors. MPO is the industry acronym for "multi fiber push on”. MPO connectors are most commonly defined by two different documents. One is IEC-61754-7, the commonly sited standard for MPO connectors internationally. The other is EIA/TIA-604-5, also known as FOCIS 5, the most common standard sited for in the US.

MTP is a registered trademark of US Conec. In fact, MTP connector is a high performance MPO connector engineered for better mechanical and optical performance. It is in complete compliance with all MPO connector standards including the EIA/TIA-604-5 FOCIS 5 and the IEC-61754-7. The following image shows an overview of a MTP/MPO connector.

MTP/MPO-type connectors are applicable in both trunk cables and harness cables. For instance, MTP/MPO trunk cables are designed for high density application which offers excellent benefits in terms on-site installation time and space saving.

MTP/MPO harness cables, also called MTP/MPO breakout cables or MTP/MPO fanout cables, work from trunk backbone assemblies to fiber rack system in the high density backbone cabling. Terminated with connectors on both ends, these cable assemblies can meet a variety of fiber cabling requirements.

Fiber optical connectors play an important role in networking connection and light transmission. They have gained even more popularity among consumers. In Fiberstore, you can find various types of connectors. ST, SC, LC, FC, D4, DIN, MU connectors are all available, besides the above-mentioned MTP/MPO connectors. For more information , please visit Fiberstore.

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Wavelength-division Multiplexing Techniques for Optical Transport Network

Nowadays, many people rely on optical networking systems for telecommunications, and the demand for a higher-speed network is growing dramatically. Wavelength Division Multiplexing (WDM) techniques deployed in optical transport network may be the suitable methods to meet this demand.

ITU-T defines an Optical Transport Network (OTN) as a set of Optical Network Elements (ONE) connected by optical fiber links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. It was designed to create a transparent, hierarchical network by using wavelength-division multiplexing (WDM).

In fiber optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity. WDM is similar to frequency-division multiplexing (FDM) except one aspect that the former is commonly applied to an optical carrier (which is typically described by its wavelength), whereas the latter typically applies to a radio carrier (which is more often described by frequency).

A WDM system uses a multiplexer at the transmitter to join the signals together, and a demultiplexer at the receiver to split them apart. It is divided into different wavelength patterns, CWDM (coarse-wavelength division multiplexing) and DWDM (dense-wavelength division multiplexing). CWDM is a technology mostly applied for cost- effective consideration, while DWDM is utilized to increase bandwidth over existing fiber optic backbones.

Based on DWDM technology, there are a series of DWDM equipment, such as DWDM transceivers, and DWDM multiplexers and demultiplexers. For example, DWDM multiplexer, generally called DWDM MUX, is widely used in WDM fiber optical networks to receive an optical data signal from the client-layer, such as Synchronous optical networking [SONET/SDH] or another type of data signal, and convert this signal into the electrical domain and re-transmits the signal at a specific wavelength using a 1,550 nm band laser. These data signals are then combined together into a multi-wavelength optical signal using an optical multiplexer, for transmission over a single fiber. In contrast, DWDM demultiplexer, generally called DWDM DEMUX, is used to separate the multi-wavelength optical signal back into individual data signals and output them on separate fibers for client-layer systems (such as SONET/SDH). The image below just shows how multiplexer and demultiplexer work.

As for DWDM price, it is a little expensive for some consumers since this kind of technology needs high-precision filters and lasers which operate at a constant temperature. High-precision, high-stability lasers are expensive, giving rise to a high price of DWDM.

The use of WDM in optical transport network can effectively multiply the bandwidth of fiber optic communication systems Fiberstore provides various WDM optical network solutions, such as transceivers, multiplexers, splitters, amplifiers, attenuators, and so on. You can visit Fiberstore for more information about WDM devices.

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CFP Optical Transceivers – CFP2s VS. CFP4s

Along with the rapid development of technology, 100-Gbps transmission has become available in various data communication applications. And many optical components have dominated 100G deployments, such as CFP optical transceivers. The C form-factor pluggable (CFP) is a hot-pluggable transceiver module form factor. It is specified by a multi-source agreement (MSA) between competing manufacturers to produce a common form-factor for the transmission of high-speed digital signals. The following passages will mainly introduce its two followers : CFP2 and CFP4.

Being a new generation of CFP, CFP2 is a hot-pluggable transceiver module that supports the IEEE 100 Gigabit Ethernet. Compared to the existing CFP, CFP2 is half the size of the CFP and consumes half the power. Besides, CFP2 doubles the front panel port density owing to integration of optics and ICs, and increase in electrical I/O rate from 10G to 25G. While talking about CFP2 optics, 100GBASE-LR4 CFP2 is widely used. It enjoys the following features and applications.

 

• Hot-pluggable CFP2 form factor
• Supports 103.1Gb/s and 112Gb/s aggregate bit rates
• Up to 10km transmission on SMF
• Duplex LC receptacles

• OTU4 4I1-9D1F Client Applications
• 100GBASE-LR4 100G Ethernet
• CFP MSA module form factor

The first CFP4s were expected to appear in 2013, but until 2014 at OFC (Optical Fiber Communication Conference 2014), the CFP4 specifications document became available announced by MSA (Multi-Source-Agreement) members. CFP4 shares similar features with CFP2 except that it has a smaller size than CFP2. In addition, the front panel port density is quadrupled by CFP4. When it comes to CFP4 products, 100GBASE-LR4 CFP4 is primarily deployed because of its outstanding features. It can support 103.1Gb/s aggregate bit rate with the maximum link lengths up to 10km on Single-Mode Fiber (SMF). Also it is appropriate for 4x25G electrical interface. As for its applications, it is suitable for 100GBASE-LR4 Ethernet, proprietary protocol, Ethernet switches and routers. In addition, CFP4 also supports 100GE-SR4 optical modules, such as 100GBASE-SR4 CFP4 850 nm 100 m Optical Transceiver for Multi-Mode fibers (MMF), and 100GBASE-SR4 and OTN Multirate CFP4 850 nm 100 m Optical Transceiver for Multi-Mode fibers (MMF).

As two versions of CFP, CFP2 and CFP4 can realize fiber connectivity with higher density and performances. Besides 100GBASE-LR4 CFP2 and 100GBASE-LR4 CFP4, 100GBASE-LR4 CFP is also available in Fiberstore. You can visit Fiberstore for more information about 100G CFP optical transceivers.

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Optical Distribution Box—Fiber Management Product in FTTH Networks

With the broad expansion of broadband networks and the trends toward installing FTTH (Fiber To The Home) infrastructures by many subscribers, various fiber optical management products are designed for cable management and protection in FTTH networks. For example, fiber distribution boxes are intended to protect and distribute the optical fiber links. Here, the following article will offer a thorough introduction of optical distribution box.

In fiber distribution systems, optical distribution box is a kind of optical fiber management device. Commonly used optical distribution boxes have 12 fibers or 14 fibers. Inside an optical distribution box are several fiber splice trays in which fiber fusion and polishing are finished. An optical distribution box also includes an optical splitter that separates and collects optical signals on an optical fiber to be distributed among two or more fibers.

While deploying optical distribution box in FTTH networks, fiber splitter distribution box FDB-16 may be an optional choice. It has 2 input ports and 16 output ports on the bottom, and all the components are pre-assembled and easy to be installed on the wall or pole. The following image of a fiber splitter distribution box FDB-16 is available.

• User familiar industry interface, using high impact plastic PC/ABS
• Can accommodate 1x16 bare fiber PLC splitter
• Can put out 16 fiber cables
• Ultra violet resistant and rainfall resistant
• Up to 16 FTTH drops
• Wall and pole mountable
• 2 inlet ports, 16 outlet ports
• Dimensions: 320*260*90mm

• Widely used in FTTH access network
• Telecommunication Networks
• CATV Networks
• Data Communications Networks
• Local Area Networks

Optical distribution boxes play an import role in FTTH networks for their reliable protection of fiber cables. They can also hold fiber optic cables well, twist and adjust fiber cables. They meet the different needs of broadband network users greatly, serving as the ideal solution of communication applications.

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Information You Should Not Miss About Fiber Patch Cables

In modern life, copper wires have given way to fiber optic patch cables due to the rapid advancements in optic technology. And fiber patch cables have been widely used to meet increasing demands for greater bandwidth and higher-speed data transmission in the telecommunication industry. Then, how much do you know about fiber patch cables? The following passages will involve essential information about fiber patch cables.

Definition And Features of Fiber Patch Cables

Fiber patch cables, also called fiber jumper cables, are fiber optic cables made of pure glass. They terminate with optical connectors on one or two cable ends, deployed to link optical equipment and components to achieve data transfer and Internet connectivity between devices. They are characteristic of low insertion loss and high return loss, high durability (more than 500 times mating), coupled with temperature stability (operating temperature: -20 to +75 ℃). For those key features, more and more people have begun to choose fiber patch cables as network transmission medium in optical network systems. Besides, their delicacy and great ability in transmitting data over either short or long distances earn reliability and trust from users.

Applications of Fiber Patch Cables

Fiber patch cables are often utilized in communication rooms, FTTH (Fiber to The Home), LAN （Local Area Network), data processing networks, premise installations, etc. In addition, CATV (Cable Television) connections also apply them for signal transmission, including audio and video images. In a word, fiber patch cables are almost everywhere in telecommunication systems.

Categories of Fiber Patch Cables

Fiber patch cables can be divided into several types according to different standards. By number of fibers and connectors standard, fiber patch cables mainly fall on two kinds, simplex and duplex patch cables. The former has one fiber and one connector, while the latter has two fibers and two connectors on both ends.

When it comes to transmission media, two typical types are single-mode and multi-mode patch cables. Single-mode fiber patch cables, usually in yellow, have one core and one pathway of light, which leads to more focused light at the center of a core. Thus, they more suitable for transmitting data over longer distances, and are used in college campuses and cable TV. As for multi-mode cables, usually in orange, they have a larger core diameter and multiple pathways of light, so they can gather more light and signals than single-mode ones over shorter distances. And they are often applied in LED sources and alarm systems.

Based on connector construction, fiber patch cables are designed in FC, SC, ST, LC, MTRJ, MPO, MU, SMA, FDDI, E2000, DIN4, and D4 types. And some of the most common cable configurations include FC-FC, FC-SC, FC-LC, FC-ST, SC-SC, and SC-ST., among which SC-ST connectors are extensively used in fiber networks, especially popular in SC to ST single-mode fiber cables. Due to their high-degree SC-ST connectors with Lucent Technologies aqua jacket, the high-quality SC-ST single-mode fiber patch cords. are pretty suitable for gigabit Ethernet transmission. The following figure displays an overview of a SC-ST single-mode fiber patch cord.

Fiber patch cables play a really important part in telecommunications for making transmission faster and more accurate. As a leading manufacturer of optical products, Fiberstore can offer those above-mentioned types of patch cables. Armored patch cables, fiber optic pigtails and other special patch cable are also available in it. For more information about fiber patch cables, please visit Fiberstore.

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Three Types of Fiber Optic Connectors—ST, SC And LC

While pulses of light are transmitted at high speed and with great accuracy, people may owe this to fiber optic patch cables. Admittedly, the role of fiber cables can’t be neglected. But fiber optic connectors also play an important role in connection and disconnection while sending signals. Fiber optic connectors are exquisite optic devices and they terminate at the end of optical fibers. Several widely-used fiber connectors are ST, SC and LC. And the following passages will introduce these fiber connectors.

Major Components And Common Features of Fiber Optic ConnectorsFiber optic connectors compromise of a ferrule and a body. A ferrule is designed to hold the ends of fiber. And because of this thin structure, a fiber connector can couple and align the core of fibers. A body is generally in metal, ceramic, or plastic structure. It attaches the connector to the jacket to achieve connection so that light can pass through the fibers. When it comes to fiber connectors’ features, when designed with good coupling mechanism technologies, they share common features:

• Low insertion loss
• High return loss (low amounts of reflection at the interface)
• Ease of installation and use
• Reliability
• Low environmental sensitivity

ST, SC And LC Connectors

ST stands for "straight tip”. This kind of connector was developed by AT&T. It has a metal connector cap that must be twisted to lock into place with a 2.5mm ferrule. Nowadays, it is still widely in LAN (Local Area Network). SC is an optical connector also with a ferrule diameter of 2.5mm. This connector is recommended in the TIA/EIA-568-A Standard for structured cabling. Analog CATV (Cable Television), datacom and telecom just deploy this SC connector.

LC is a popular small form factor (SFF) connector developed by Lucent with a 1.25 mm ferrule. It is available in single-mode and multi-mode versions, such as LC-LC multi-mode fiber patch cable that has LC connectors on both ends. Certainly, there is also LC-LC multi-mode duplex fiber patch cable which consists of two strands of glass and send multiple light signals. It enjoys the following characteristics and is highly recommended due to its high performance.

• LC-LC Connectors
• Multi-mode duplex fiber optic cable
• Micron: 50/125um
• Complete with Lucent Technologies aqua jacket
• Bandwidth transmitting rates up to 10 gigabits
• High degree connectors.

The following image shows the appearance of LC-LC multi-mode duplex fiber patch cable.

Fiber optic connectors allow for quick connection, efficient light transmission, and easy Internet connectivity. They become increasingly popular in telecommunication market. Fiberstore offers various kinds of fiber optic connectors. FC, D4, DIN, MU, the MTP, MPO connectors are all supplied in it besides ST, SC and LC. You can visit Fiberstore for more information about fiber optic connectors.

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What Are OS1 And OS2 Single-mode Fiber Cables?

Detailed written specifications are required in the process of manufacturing and installing products to ensure the smooth progress, especially for those sophisticated fiber optical products. Take single-mode fiber cables for example, OS1 and OS2 terminologies are applied by fiber optic cable manufacturers to make sure that products are qualified and suitable for applications. Are you familiar with the OS1 and OS2 specifications? The following passages will clarify these two standards in details.

OS1 and OS2 are terminologies which describe single-mode optical fiber specifications. First introduced in the year 2002, OS1 refers to a very old specification for single-mode fiber. The characteristics of OS1 single-mode fibers are compliant with ITU-T G.652A or ITU-T G.652B. Besides, G.652C and G.652D categorized in ITU-T recommendations are also under OS1 fibers, which make OS1 a general term used to specify single-mode optical fibers that come under the heading of ITU-T G.652. This means that OS1 includes all the single-mode fiber cables that are compliant with ITU-T G.652, while OS2 requires single-mode fiber cables to be compliant with G.652C and G.652D categorized in ITU-T recommendations.

Respective Applications of OS1 And OS2 Categories

Category OS1 cable is intended for indoor or internal use, such as campus, data center Its transmission distance can reach up to 2,000 meters with speed ranging from 1 to 10 Gigabit Ethernet. Category OS2 cable is suitable for such outdoor or external solutions as street and underground. Compared with OS2 outdoor fiber cable, OS1 fiber cable experiences greater loss per kilometer, leading to a lower price of OS1 fiber than OS2 The following table shows attenuation of 1.0db/km for OS1 compared to 0.4db/km for OS2 outdoor cable.

Actually, while classifying single-mode fiber cables, other different standards are also applicable. In terms of connector construction, single-mode fiber cables are designed in FC, SC, ST, LC, etc. Among these types, single-mode fiber cable with LC connector is more often used to support Gigabit Ethernet applications for up to 10 kilometers. According to number of fibers and connectors, single-mode simplex fiber and single-mode duplex fiber are available in categories. Besides these types, ribbon single mode fiber cables are also supplied in Fiberstore. For more information about single-mode fiber cables, please visit Fiberstore.

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