Category Archives: Fiber Optic

Introduction Of Specialty Fibers For Optical Communication Systems

Optical fiber communications have changed our lives over the last 40 years. There is no doubt that low-loss optical transmission fibers have been critical to the enormous success of optical communications technology. It is less well known however, that fiber-based components have also played a critical role in this success.

Initially, fiber optic transmission systems were point to point systems, with lengths significantly less than 100 km. Then in the 1980s, rapid progress was made on the research and understanding of optical components including fiber components. Many of these fiber components found commercial applications in optical sensor technology such as in fiber gyroscopes and other optical sensor devices. Simple components such as power splitters, polarization controllers, multiplexing components, interferometric devices, and other optical components proved to be very useful. A significant number of these components were fabricated from polarization maintaining fibers (PMFs). You can buy the PM fiber patch cables from Fiberstore.

Although not a large market, optical fiber sensor applications spurred research into the fabrication of new components such as polarization maintaining components, other components such as power splitters were fabricated from standard multimode (MM) or single-mode telecommunication fiber. In the telecommunication sector, the so-called passive optical network was proposed for the already envisioned fiber-to-the-home (FTTH) network. This network relied heavily on the use of passive optical splitters. These splitters were fabricated from standard single-mode fibers (SMFs). Click here to get the price single mode cable fiber optic. Although FTTH, at a large scale, did not occur until decades later, research into the use of components for telecommunications applications continued.

The commercial introduction of the fiber optical amplifier in the early 1990s revolutionized optical fiber transmissions. With amplification, optical signals could travel hundreds of kilometers without regeneration. This had major technical as well as commercial implications. Rapidly, new fiber optic components were introduced to enable better amplifiers and to enhance these transmission systems. Special fibers were required for the amplifier, for example, erbium-doped fibers. The design of high-performance amplifier fibers required special considerations of mode field diameter, overlap of the optical field with the fiber active core, core composition, and use of novel dopants. Designs radically different from those of conventional transmission fiber have evolved to optimize amplifier performance for specific applications. The introduction of wavelength division multiplexing (WDM) technology put even greater demands on fiber design and composition to achieve wider bandwidth and flat gain. Efforts to extend the bandwidth of erbiumdoped fibers and develop amplifiers at other wavelength such as 1300nm have spurred development of other dopants. Codoping with ytterbium (Yb) allows pumping from 900 to 1090nm using solid-state lasers or Nd and Yb fiber lasers. Of recent interest is the ability to pump Er/Yb fibers in a double-clad geometry with high power sources at 920 or 975 nm. Double-clad fibers are also being used to produce fiber lasers using Yb and Nd.

Besides the amplication fiber, the EDFA (Erbium-Doped Fiber Amplifier) requires a number of optical components for its operation. These include wavelength multiplexing and polarization multiplexing devices for the pump and signal wavelengths. Filters for gain flattening, power attenuators, and taps for power monitoring among other optical components are required for module performance. Also, because the amplifier-enable transmission distance of hundreds of kilometers without regeneration, other propagation propeties became important. These properties include chromatic dispersion, polarization dispersion, and nonlinearities such as four-wave mixing (FWM), self-and cross-phase modulation, and Raman and Brillouin scattering. Dispersion compensating fibers were introduced in order to deal with wavelength dispersion. Broadband coupling losses between the transmission and the compensating fibers was an issue. Specially designed mode conversion or bridge fibers enable low-loss splicing among these thre fibers, making low insertion loss dispersion compensators possible. Fiber components as well as microoptic or in some instance planar optical components can be fabricated to provide for these applications. Generally speaking, but not always, fiber components enable the lowest insertion loss per device. A number of these fiber devices can be fabricated using standard SMF, but often special fibers are required.

Specialty fibers are designed by changing fiber glass composition, refractive index profile, or coating to achieve certain unique properties and functionalities. In addition to applications in optical communications, specialty fibers find a wide range of applications in other fields, such as industrial sensors, biomedical power delivery and imaging systems, military fiber gyroscope, high-power lasers, to name just a few. There are so many linds of specialty fibers for different applications. Some of the common specialty fibers include the following:

Active Fibers: These fibers are doped with a rare earth element such as Er, Nd, Yb or another active element, The fibers are used for optical amplifiers and lasers. Erblium doped fiber amplifiers are a goog example of fiber components using an active fiber. Semiconductor and nanoparticle doped fibers are becoming an interesting research topic.
Polarization Control Fibers: These fibers have high birefringence that can maintain the polarization state for a long length of fiber. The high birefringence is introduced either by asymmetric stresses such as in Panda, and bowtie design. If both polarization modes are available in the fiber, the fiber is called PMF. If only one polarization mode propagates in the fiber while the other polarization mode is cutoff, the fiber is called single polarization fiber.
Dispersion Compensation Fibers: Fibers have opposite chromatic dispersion to that of transmission fibers such as standard SMFs and nonzero dispersion shifted fibers (NZDSFs). The fibers are used to make dispersion compensation modules for mitigating dispersion effects in a fiber transmission system.
Highly Nonlinear Optical Fibers: Fibers have high nonlinear coefficient for use in optical signal processing and sensing using optical nonlinear effects such as the optical Kerr effect, Brillouin scattering, and Raman scattering.
Coupling Fibers or Bridge Fibers: Fibers have mode field diameter between the standard SMF and a specialty fiber. The fiber serves as an intermendiate coupling element to reduce the high coupling loss between the standard SMF and the specialty fiber.
Photo-Sensitive Fibers: Fibers whose refractive index is sensitive to ultraviolet (UV) light. This type of fiber is used to produce fiber gratings by UV light exposure.
High Numerical Aperture (NA) Fibers: Fibers with NA higher than 0.3. These fibers are used for power delivery and for short distance communication applications.
Special SMFs: This category includes standard SMF with reduced cladding for improved bending performance, and specially designed SMF for short wavelength applications.
Specially Coated Fibers: Fibers with special coating such as hermitic coating for preventing hydrogen and water penetration, metal coating for high temperature applications.
Mid-Infrared Fibers: Non-silica glass-based fibers for applications between 2 and 10 micron
Photonic Crystal Fibers (PCFs): Fibers with periodic structure to achieve fiber properties that are not available with conventional fiber structures.

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Guide To Fiber Optic Splice Closure

Fiber optic splice closure is usually used with outdoor fiber optic cables, provides space for the outdoor fiber optic cables to be spliced together. The fiber optic splice closures and the fiber trays inside will protect the spliced fiber and the joint parts of the outdoor fiber cables. Generally the fiber optic splice closures are dome type and horizontal types, and Horizontal Fiber optic Splice Closure is used more often.

Structure Of Fiber Splice Closures
The fiber splice closures are made from special industrial grade, high tension plastic with a reliable moisture barrier. They are also optimized to resist aging of the material due to factors in the natural environment such as ultraviolet light.

There are two main types of closures, fiber optic and fiber optic terminal. A closure is hardware used to restore integrity of fiber cables entering the enclosure. The terminal is a hardened external connector that allows the addition of one or more fiber cables to the enclosure. These two categories can be configured as butt closures and in-line closures. The butt closure allows cables to enter from one end, while the in-line allows entry from both ends. Both the butt closures and in-line closures can be one of the following types:

Fiber Optic Splice Closures Key Features:

The box add aging-resistant in imported high tensile construction plastic out-faster is made up of stainless steel;
Overlap structure in splicing tray easy to install;
Suitable for ordinary fiber and ribbon fiber;
Perfect leak proofness and fine function;
Perfect and reliable sealing operations;
Fiber-bending radium guaranteed more than 40mm;
Full accessories for convenient operations;
Fiber optic splice closure can be used repeatedly;
High reliability;
For aerial, and direct buried applications.

Fiber Optic Splice Closure Types

For outside plant splice closure, there are two major types: horizontal type and vertical type.

1) Horizontal type

Horizontal type splice closures look like flat or cylindrical case. They provide space and protection for optical cable splicing and joint. They can be mounted aerial, buried, or for underground applications. Horizontal types are used more often than vertical type (dome type) closures.

Most horizontal fiber closure can accommodate hundreds of fiber connections. They are designed to be waterproof and dust proof. They can be used in temperature ranging from -40°C to 85°C and can accommodate up to 106 kpa pressure. The cases are usually made of high tensile construction plastic, are widely used in CATV, telecommunications and fiber optic networks.

2) Vertical Type

Vertical type of fiber optic splice closures looks like a dome, thus they are also called dome fiber optic splice closure. They meet the same specification as the horizontal types. They are designed for buried applications.

Vertical fiber optic splice closures are made of excellent engineering plastics, they are with 1inlet/outlet ports, 2inlet/outlet ports, 3inlet/outlet ports types, fitting different fiber optic core numbers. The vertical fiber optic splice closure is used in CATV, telecommunications and fiber optic networks.

Fiber splice closures accept both Ribbon Cable and round fiber cables. Each type (ribbon or round cable) fits respective requirement of different fiber splicing counts. They are widely used in optic telecommunication systems. JFOPT offers fiber optic splice closure, vertical, horizontal, dome, from 2 cores to 240 cores maximum, with inside fiber optic splice trays accessories like fusion splice sleeves.

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Detail Of Single Mode And Multi Mode Fiber Optic Cable

Fiber optic cable has become apparent that fiber-optics are steadily replacing copper wire as an appropriate means of communication signal transmission. They span the long distances between local phone systems as well as providing the backbone for many network systems. Other system users include cable television services, university campuses, office buildings, industrial plants, and electric utility companies.

There are three types of fiber optic cable commonly used:  single mode, multimode and plastic optical fiber (POF).  Although fibers can be made out of transparent plastic, glass, or a combination of the two, the fibers used in long-distance telecommunications applications are always glass, because of the lower optical attenuation.  Both multi-mode and single-mode fibers are used in communications, if you need to transmit less data over longer distances, use single mode fiber optic cables. For a greater data capacity over shorter distances, go with multi mode fiber optic cables, with multi-mode fiber used mostly for short distances (up to 500 m),Multi mode is often used for LANs and other small networks. And single-mode fiber used for longer distance links.

Single Mode Fiber: Single Path through the fiber

Single Mode cable is a single stand (most applications use 2 fibers) of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission.  Single Mode Fiber with a relatively narrow diameter, through which only one mode will propagate typically 1310 or 1550nm. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width.  Single Mode is also referred to as single-mode fiber, single-mode optical waveguide, mono-mode optical fiber and uni-mode fiber. Single-mode fiber gives you a higher rate of transmission, it also can carry the signal up to 50 times farther distance than multimode, at a slightly higher cost.Single-mode fiber has a much smaller core than multimode.

Single Mode fiber is used to connect long distance switches, central offices and SLCs (subscriber loop carriers, small switches in pedestals in subdivisions or office parks or in the basement of a larger building). Practically every telco’s network is now fiber optics except the connection to the home.

Multi Mode Fiber: Multiple Paths through the fiber

Multi-Mode cable has a little bit bigger diameter, with a common diameters in the 50-to-100 micron range for the light carry component (in the US the most common size is 62.5um).Typical multimode fiber core diameters are 50, 62.5, and 100 micrometers.  Multi Mode fiber is used for shorter distances. Most applications in which Multi-mode fiber is used, 2 fibers are used. Multimode fiber gives you high bandwidth at high speeds (10 to 100MBS – Gigabit to 275m to 2km) over medium distances. Light waves are dispersed into numerous paths, or modes, as they travel through the cable’s core typically 850 or 1300nm. Long cable runs (Above 3000 feet 914.4 meters in length), the multiple paths of light are believed to cause signal distortion at the receiving end, resulting in lost packets and incomplete data transmission. IPS recommends the use of single mode fiber in all applications using Gigabit and higher bandwidth.

A Quick Guide To Fiber Optic Power Meter

When you install and terminate fiber optic cables, you always have to test them. A test should be conducted for each fiber optic cable plant for three main areas: continuity, loss, and power. And optical power meters are part of the toolbox essentials to do this. There are general-purpose power meters, semi-automated ones, as well as fiber optic power meters optimized for certain types of networks, such as FTTx or LAN/WAN architectures. It’s all a matter of choosing the right gear for the need.

Handheld Optical Laser Source JFT-03

Handheld Optical Laser Source JFT-03

Here is a quick guide to fiber optic power meters and how they work.

Optical power meters are commonly used to measure absolute light power in dBm. For dBm measurement of light transmission power, proper calibration is essential. A fiber optic power meter is also used with an optical light source for measuring loss or relative power level in dB. To calculate the power loss, optic power meter is first connected directly to an optical transmission device through a fiber optic pigtail, and the signal power is measured. Then the measurements are taken at the remote end of the fiber cable.

Fiber optic power meter detects the average power of a continuous beam of light in an optical fiber network, tests the signal power of laser or light emitting diode (LED) sources. Light dispersion can occur at many points in a network due to faults or misalignments; the power meter analyzes the high-powered beams of long-distance single-mode fibers and the low-power multibeams of short-distance multimode fibers.

Important specifications for fiber optic power meters include wavelength range, optical power range, power resolution, and power accuracy. Some devices are rack-mounted or hand held. Others are designed for use atop a bench or desktop. Power meters that interface to computers are also available.

The fiber optic power meter is a special light meter that measures how much light is coming out of the end of the fiber optic cable. The power meter needs to be able to measure the light at the proper wavelength and over the appropriate power range. Most power meters used in datacom networks are designed to work at 850nm and 1300nn. Power levels are modest, in the range of –15 to –35dBm for multimode links, 0 to –40dBm for single mode links. Power meters generally can be adapted to a variety of connector styles such as SC, ST, FC, SMA, LC, MU, etc.

Generally, multimode fiber is tested with LEDs at both 850nm and 1300nm and single mode fiber is tested with lasers at 1310nm and 1550nm. The test source will typically be a LED for multimode fiber unless the fiber is being used for Gigabit Ethernet or other high-speed networks that use laser sources. LEDs can be used to test single mode fibers less than 5000 meters long, while a laser should be used for long single mode fibers.

Most fiber optic power meters are calibrated in linear units such as milliwatts or microwatts. They may also provide measurements in decibels referenced to one milliwatt or microwatt of optical power. Typically, fiber optic power meters include a removable adaptor for connections to other devices. By measuring average time instead of peak power, power meters remain sensitive to the duty cycle of digital pulse input streams.

Use fiber optic power meter and other useful fiber optic test equipment to ensure that your fiber optic system will operate smoothly.

12 cores Ribbon Indoor Flat Fiber Optic Cable

12 cores Ribbon Indoor Flat Fiber Optic Cable:

pdf.gif 12 cores Ribbon Indoor Flat Fiber Optic Cable Specification

Fiber count: 12
Optical fiber ribbon Color:
Aramid yarn
Outer jacket material
Thickness: 0.5±0.1mm


Appearance Slickness, without bumps
Package Wooden drum
Length Not less than 1000M, nearly the same length per drum and other length
upon negotiation.
Test report Attached with OTDR test report,qualified certificate label the style of fiber.


Fiber property:

Fiber type Unit Single mode
fiber G652B
OM3 300
Condition nm 1310/1550 850/1300 850/1300 850/1300
Attenuation dB/km 0.40/0.30 3.5/1.5 3.5/1.5 3.5/1.5
Dispersion 1550nm ps(nm·km) ≤18 —– —– —–
1625nm ps(nm·km) ≤22 —– —– —–
Bandwidth 850nm MHZ·.km —– ≥200 ≥160 ≥1500
1300nm MHZ.  ·km —– ≥200 ≥200 ≥500

Technical Specification:

Fiber Count Dimension Nominal weight Min.Bending Radius Max. Tension(N)
(mm) (kg/km) (mm) Short-term Long-term
Width Height Dynamic Static
4 3.1±0.3 2.5±0.3 10 60 30 150 80
6 3.2±0.3 2.5±0.3 11
5 3.6±0.3 2.5±0.3 13
12 4.2±0.3 2.5±0.3 15

Waterproof Fiber Optic Pigtail

Waterproof Fiber Optic Pigtail

pdf.gif Waterproof Fiber Optic Pigtail Specification

Waterproof Fiber Optic Pigtail Description:
Waterproof Pigtail is a length of fiber with one-end connector attached, suitable for out door use and adverse environmental condition.

Waterproof Fiber Optic Pigtail Features:

  • High return loss and low insertion loss
  • Good reliability and stability
  • Excellent water-resistance performance
  • Waterproof, rigid and anti-corrosive copper connector
  • Simple installation
  • Capacity: 2, 4, 6 cords Available
  • Applicable to FC, SC, ST, LC,MU…Connectors

Waterproof Fiber Optic Pigtail Application:

  • Optic Fiber Communications Systems
  • Optical Fiber CATV
  • Connecting with Backbone Optical Cable and Rx

Source: fiber optic cable manufacturer

What are Fiber Optic Patch Cables

Fiber optic patch cable, often called fiber optic patch cord or fiber jumper cable, is a fiber optic cable terminated with fiber optic connectors on both ends. It has two major application areas: computer work station to outlet and fiber optic patch panels or optical cross connect distribution center. Fiber optic patch cables are for indoor applications only.

Types of fiber optic patch cables
Fiber optic patch cables can be divided into different types based on fiber cable mode, cable structure, connector types, connector polishing types and cable sizes.

Fiber optic patch Cable Mode:

1. Single mode fiber patch cables:  Single mode fiber optic patch cables use 9/125 micron bulk single mode fiber cable and single mode fiber optic connectors at both ends. Single mode fiber optic cable jacket color is usually yellow. Here is the explanation of what is single mode and single mode fiber.

2. Multimode fiber patch cables: Multimode fiber optic patch cables use 62.5/125 micron or 50/125 micron bulk multimode fiber cable and terminated with multimode fiber optic connectors at both ends.  Multimode fiber optic cable jacket color is usually orange. Here is the explanation of what is multimode and multimode fiber.

3. 10gig multimode fiber optic patch cables:  10Gig multimode fibers are specially designed 50/125 micron fiber optimized for 850nm VCSEL laser based 10Gig Ethernet. They are backward compatible with existing network equipment and provide close to three times the bandwidth of traditional 62.5/125 multimode fibers. 10 Gigabit is rated for distances up to 300 meters using 850nm Vertical Cavity Surface Emitting Lasers (VCSEL). 10Gig fiber optic cable jacket is usually aqua.

Fiber patch Cable Structure:

1. Simplex fiber optic patch cables: Simplex fiber patch cable has one fiber and one connector on each end.

2. Duplex fiber optic patch cables: Duplex fiber patch cable has two fibers and two connectors on each end. Each fiber is marked “A” or “B” or different colored connector boots are used to mark polarity.

3. Ribbon fan-out cable assembly: For ribbon fan-out cable assembly, one end is ribbon fiber with multi fibers and one ribbon fiber connector such as MTP connector (12 fibers), the other end is multi simplex fiber cables with connectors such as ST, SC, LC, etc.

Source: fiber optic cable manufacturer

What Is Fiber Optical Connectors

Fiber optic connectors, detachable (active) device connected between the fiber and the fiber, the two fiber end face precision docking up to launch the optical output of light energy to maximize the coupling to the receiving fiber,and because of its involvement in the optical link system impact be minimized, which is the basic requirements for fiber optic connectors. To a certain extent, fiber optic connectors affect the reliability and the performance of optical transmission systems.

Fiber Optic Connector is an important components used in the fiber optic network. It is also the key part used in fiber optic patch cord and fiber optic pigtail. There are many kinds of fiber optic connectors.we supply one piece fiber optic connectors various types, including standard connectors and irregular types, epoxy types. And fiber optic types include: SC fiber optic connector, FC fiber optic connector, ST fiber optic connector,LC fiber optic connector,MU fiber optic connector, SC/APC fiber optic connector, FC/APC fiber optic connector, etc. both Single mode fiber optic connector and multimode fiber optic connector available.

There are Single mode fiber optic connector and Multimode fiber optic connector, Single mode fiber optic connectors can be with PC, or UPC or APC polish, while Multimode fiber optic connectors only with PC or UPC polish. PC or UPC or APC refer to how we polish the ferrule of the fiber optic connectors. Judging from the out looking, Multimode connectors are usually with black boot or beige color, Single mode PC and UPC ones are usually with blue or black color, Single mode APC is with green color. Insertion loss is important technical data of the fiber optic connectors. The smaller the better. APC insertion loss is smaller than UPC, UPC is smaller than PC.

Fiber optical connectors are used to join optical fibers where a connect/disconnect capability is required. There are many types of connectors, the commonly types are LC, SC, FC, ST, MU, E2000.

LC is Lucent Connect or Little Connector or Local Connector. Its ferrule diameter is 1.25mm based on standard of IEC 61754-20. They are often found on small form-factor pluggable transceivers.

SC is Subscriber Connector or square connector or standard connector. Its ferrule diameter is 2.5mm and based on the standard of IEC 61754-4. SC connectors offer excellent packing density and their push-pull design reduces the chance of fiber end face contact damage during connection; frequently found on the previous generation of corporate networking gear, using GBICs.

FC long form is ferrule connector or fiber channel. FC connector has same ferrule diameter as SC but standard (IEC-61754-13). FC connectors need to be mated more carefully than the push-pull types due to the need to align the key, and due to the risk of scratching the fiber end face while inserting the ferrule into the jack. FC connectors have been replaced in many applications by SC and LC connectors.

ST long form is straight tip. The ferrule diameter is 2.5mm and according to standard IEC 61754-2. ST has a key which prevents rotation of the ceramic ferrule, and a bayonet lock similar to a BNC shell.

MU (Miniature unit Coupling) connector is the SC connector is currently the most used based on the developed world’s smallest single-core optical fiber connector, developed by NTT.

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Fbt Coupler Fiber Optic Patch Cables And Dwdm Sfp Transceiver

Fiber optic splitter is used to split the fiber optic light into several parts at a certain ratio. We use fiber optic splitter to distribute or combine optical signals in many applications, such as FTTH solution, etc. Fiber optic splitters are important passive components used in FTTX networks. Fiber optic splitters can be terminated with different kinds of connectors, the main package could be box type or stainless tube type, one is usually used with 2mm or 3mm outer diameter cable, the other is usually used with 0.9mm outer diameter cables.

Two kinds of fiber splitters are popular used, one is the traditional fused type fiber optic splitter (FBT coupler), which features competitive prices; the other is PLC fiber optic splitter, which is compact size and suit for density applications. Both of them have its advantages to suit for different requirement. FBT Couplers are designed for power splitting and tapping telecommunication equipment, CATV networks, and test equipment. These components are available individually or integrated into modules for fiber protection switching, MUX/DMUX, optical channel monitoring, and add/drop multiplexing applications.

Major differences between PLC splitters and FBT Coupler

1. Technology behind FBT Coupler and PLC splitter.
FBT coupler: Fused Biconical Taper, this is traditional technology to weld several fiber together from side of the fiber.
PLC splitter: Planar Lightwave Circuit is a micro-optical components product, the use of lithography, the semiconductor substrate in the medium or the formation of optical waveguide, to achieve
branch distribution function.

2. Disadvantages and advantages between FBT and PLC.
PLC splitter FBT coupler
SpliSplit Ratio (Max) 1*64 splits 1*4 splits
EveEveness Can split light evenly Eveness is not very precise
SizeSizeSize Compact size Big size for multi splits

Fiber Patch Cable also known as fiber jumper or fiber patch cord, which is a fiber optic cable terminated with fiber optic connectors on both ends. There are two major application areas of Fiber
Patch Cable: computer work station to outlet and fiber optic patch panels or optical cross connect distribution center. Fiber optic patch cables are for indoor applications only. Single-mode fiber
Patch cable is primarily used for applications involving extensive distances. Multimode fiber optic patch cord, however, is the cable of choice for most common local fiber systems as the devices for multimode are far cheaper.

Jfiberoptic Dense Wavelength Division Multiplexing (DWDM) Small Form-Factor Pluggable (SFP) is available in all 100 GHz C-band wavelengths on the DWDM ITU grid. They are designed to Multi-Source Agreement (MSA) standards to ensure broad network equipment compatibility. As multirate interfaces they support any protocol from 100 Mbps to 4.25 Gbps. DWDM SFP transceivers provide the high speeds and physical compactness that today’s networks require while delivering the deployment flexibility and inventory control that network administrators demand. The 1.25G DWDM SFP transceivers are small form factor pluggable modules for bi-directional serial optical data communications such as 4x/2x/1x Fibre Channel, SDH/SONET, Ethernet applications. We supply 1.25G DWDM SFP modules are hot pluggable and digital diagnostic functions area vailable via an I2C serial bus specified in the SFP MSA SFF-8472. The DWDM SFP transceiver has undergone rigorous qualification and certification testing to provide End-to-End Compatibility using switching equipment from CISCO, BROCADE, JUNIPER, ALCATEL, HP (select models), NORTEL, EMC, QLOGIC and other OEMs.

Fiber optic patch cord info from

The Difference Between Single Mode and Multi Mode Fiber Optics

You’ve probably heard the terms “single mode” and “multi mode” fiber optic cables. But what’s the difference between single mode and multi mode fiber optics? Well, it’s pretty simple – but you have to go INSIDE the cable for the answer.

Basically, the main difference with each type of fiber optic cable is the interior size.

Single mode fibers consist of a tiny glass core that typically has a diameter between 8.3 and 10 microns (9 microns is a popular size). The single glass strand carrier higher bandwidth than multi mode fiber optic. However, the single mode fiber optic uses one light source in a tight spectral width. The result? Single mode fiber optic is your best choice for transferring high speed data over long distances. Their unique properties make single mode less susceptible to attenuation than multi mode fiber optics.
Multi mode fibers contain much larger cores than single mode. Their cores are anywhere from 5 to 7 times larger than single mode cores. With a diameter ranging between 50 to 62.5 microns, multi mode fiber optics can accommodate a higher data volume than single mode. But with the greater capacity comes a setback – multi mode fiber optics have higher attenuation levels, so they’re typically used over shorter distances.
When choosing fiber optic cable for your network, the key considerations should be attenuation and distance. If you need to transmit less data over longer distances, use single mode fiber optic cables. For a greater data capacity over shorter distances, go with multi mode fiber optic cables. Multi mode is often used for LANs and other small networks.