Author: Fiber-MART.COM

With the exponential growth in communications, caused largely by the wide acceptance of the Internet, many carriers have found their estimates of fiber needs have been highly underestimated. Although most cables included many spare fibers when installed, this growth has used many of them and new capacity is required. Make use of a number of ways to improve this problem, eventually the WDM has shown more cost effective in most cases.

WDM Definition:

Wave Division Multiplexing (WDM) enables multiple data streams of varying wavelengths (“colors”) to become combined right into a single fiber, significantly enhancing the overall capacity from the fiber. WDM can be used in applications where considerable amounts of traffic are needed over long distance in carrier networks. There’s two types of WDM architectures: Course Wave Division Multiplexing (CWDM) and Dense Wave Division Multiplexing (DWDM).

WDM System Development History:

A WDM system uses a multiplexer in the transmitter to become listed on the signals together, and a demultiplexer at the receiver to separate them apart. With the right type of fiber it is possible to have a device that does both simultaneously, and can work as an optical add-drop multiplexer. The optical filtering devices used have conventionally been etalons (stable solid-state single-frequency Fairy¡§CP¡§|rot interferometers by means of thin-film-coated optical glass).

The idea was first published in 1980, and by 1978 WDM systems appeared to be realized in the laboratory. The first WDM systems combined 3 signals. Modern systems are designed for as much as 160 signals and can thus expand a fundamental 10 Gbit/s system over a single fiber pair to in excess of 1.6 Tbit/s.

WDM systems are well-liked by telecommunications companies because they allow them to expand the capacity of the network without laying more fiber. By utilizing WDM and optical amplifiers, they can accommodate several generations of technology rise in their optical infrastructure without needing to overhaul the backbone network. Capacity of a given link can be expanded by simply upgrades towards the multiplexers and demultiplexers at each end.

This is often made by use of optical-to-electrical-to-optical (O/E/O) translation in the very edge of the transport network, thus permitting interoperation with existing equipment with optical interfaces.

WDM System Technology:

Most WDM systems operate on single-mode fiber optical cables, which have a core diameter of 9 µm. Certain forms of WDM may also be used in multi-mode fiber cables (also referred to as premises cables) which have core diameters of fifty or 62.5 µm.

Early WDM systems were expensive and complicated to operate. However, recent standardization and better understanding of the dynamics of WDM systems make WDM less expensive to deploy.

Optical receivers, as opposed to laser sources, tend to be wideband devices. Therefore the demultiplexer must provide the wavelength selectivity of the receiver in the WDM system.

WDM systems are split into different wavelength patterns, conventional/coarse (CWDM) and dense (DWDM). Conventional WDM systems provide up to 8 channels within the 3rd transmission window (C-Band) of silica fibers around 1550 nm. Dense wavelength division multiplexing (DWDM) uses the same transmission window but with denser channel spacing. Channel plans vary, but a typical system would use 40 channels at 100 GHz spacing or 80 channels with 50 GHz spacing. Some technologies are capable of 12.5 GHz spacing (sometimes called ultra-dense WDM). Such spacing’s are today only achieved by free-space optics technology. New amplification options (Raman amplification) enable the extension of the usable wavelengths towards the L-band, pretty much doubling these numbers.

Coarse wavelength division multiplexing (CWDM) in contrast to conventional WDM and DWDM uses increased channel spacing to allow less sophisticated and thus cheaper transceiver designs. To supply 8 channels on one fiber CWDM uses the whole frequency band between second and third transmission window (1310/1550 nm respectively) including both windows (minimum dispersion window and minimum attenuation window) but the critical area where OH scattering may occur, recommending using OH-free silica fibers in case the wavelengths between second and third transmission window ought to be used. Avoiding this region, the channels 47, 49, 51, 53, 55, 57, 59, 61 remain and these are the most commonly used. Each WDM Optical MUX includes its optical insertion loss and isolation measures of every branch. WDMs are available in several fiber sizes and kinds (250µm fiber, loose tube, 900µm buffer, Ø 3mm cable, simplex fiber optic cable or duplex fiber cable).

WDM, DWDM and CWDM are based on the same idea of using multiple wavelengths of sunshine on one fiber, but differ within the spacing of the wavelengths, quantity of channels, and also the capability to amplify the multiplexed signals within the optical space. EDFA provide an efficient wideband amplification for that C-band, Raman amplification adds a mechanism for amplification in the L-band. For CWDM wideband optical amplification is not available, limiting the optical spans to many tens of kilometers.

Regardless if you are WDM Optical MUX expert or it is your first experience with optical networking technologies, fiber-mart.com products and services are equipped for simplicity of use and operation across all applications. If you want to choose some fiber optic cable to connect the WDM, you are able to make reference to our fiber optic cable specifications. Have any questions, pls contact us.

With the growing demand of broadband, Passive Optical Network (PON) is the most promising NGN (Next Generation Networking) technology to meet the demand currently. GEPON (Gigabit Ethernet Passive Optical Network) use WDM technology and it is with 1Gbps bandwidth and up to 20km working distance, which is a perfect combination of Ethernet technology and passive optical network technology.

GEPON Technology:

The GEPON (Gigabit Ethernet Passive Optical Network) system is composed of the Optical Line Terminal (OLT), Optical Distribution Network (ODN) and Optical Network Unit (ONU). The ODN consists of only passive elements splitters, fibre connector and fiber optics. PON means passive optic network, EPON is integrated with Ethernet technologies, and GEPON is a Gigabit EPON. GEPON system is designed for telecommunication use. This series of products features high integration, flexible application, easy management, as well as providing QoS function. The fiber network speed can reach up to 1.25GB/s and each EPON OLT (Optical Line Terminal) system can distribute into 32 remote ONU (Optical Network Unit) to build up the fiber passive network by a max 32-way optical splitter with the advantage of big capacity of data transmission, high security, flexibility of buildup network, mainly applies for FTTH (Fiber To The Home) projects, which can access to IP telephone, Broadband data and IPTV.

GEPON is a perfect combination of Ethernet technology and passive optical network technology. It eliminates the usage of active fiber optic components between OLT and ONU, this will greatly cut the cost and make the network easier to maintain. GEPON use WDM technology and it is with 1Gbps bandwidth and up to 20km working distance.

Optical Splitter Work In GEPON Network:

Passive Fiber Optic Splitters For GEPON Network, the Optical Splitter, also named beam splitter, is based on a quartz substrate of integrated waveguide optical power distribution device, the same as coaxial cable transmission system, The optical network system also needs to be an optical signal coupled to the branch distribution, which requires the fiber optic splitter, Is one of the most important passive devices in the optical fiber link, is optical fiber tandem device with many input terminals and many output terminals, Especially applicable to a passive optical network (EPON, GPON, BPON, FTTX, FTTH etc.) to connect the MDF and the terminal equipment and to achieve the branching of the optical signal.

GEPON splitter based on planar lightwave circuit technology and precision aligning process can divide a single/dual optical input(s) into multiple optical outputs uniformly, and offer superior optical performance, high stability and high reliability to meet various application requirements. Our standard modules with GEPON Splitter have “ABS-type” & “Rack-type”. We can also have the customized dimension. If you need the customized service,pls contact us for detail conditions for customization. Our customization includes branding fiber-mart.com or OEM,modifying physical size and appearance and re-designing per customer requirements.

fiber-mart.com provides some kinds of passive optical components, available components include couplers, planar splitters and wavelength division multiplexers (WDMs).We not oly provide the optical components,but also suppply the cheap fiber optic cable.

GBIC transceiver is short term for the Gigabit Interface Converter, it is a media conversion device between Gigabit Ethernet and fiber optic networks, using this single device, connections can be made using single- or multi-mode fiber optic ports as well as copper wiring. You’ll be able to benefit from it in many point-to-point communications applications that involve interconnecting components and exchanging data between Ethernet and fiber optic networks. Through the GBIC transceiver, Gigabit network equipment can directly connect with copper wires, single mode fiber ports or multimode fiber ports.

 Features:

 The GBIC design can be used as hot-swap. GBIC is interchangeable products meet international standards. Gigabit switch with GBIC interface designed interchangeable flexible, take into account a big market share in the market. GBIC Series product specifications are complete, including 850nm, 1310nm, 1550nm ,1470-1610nm four series. Requirements, all products happen to be rigorously tested, fully fulfill the IEEE 802.3z and GBIC-rev-5.5 standard, the performance targets were met or exceeded standards suitable for Gigabit Switch companies are able to use the Cisco whole number of switches and 3COM, INTEL, ALCATEL, AVAYA, EXTREME brand switches as well as other switches comply with GBIC specification.

 GBIC transceiver being a objective of the input / output transceivers. Its one end is inserted into the Gigabit Ethernet ports, for example port network switching equipment. However, attached to said transceiver towards the optical fiber network, usually through an optical fiber jumper. The apparatus characterized by the features, including wavelength, it could be processed, and how efficiently transmit data, the ability needs to operate, and the distance it could transmit data. These are the basic main things to consider when selecting a GBIC transceivers, to make sure that it meets the requirements of network performance.

 The GBIC has become a standard form factor optical transceivers, and can support many different physical media, from traditional copper long-wave single-mode optical fiber length of a couple of hundred kilometers. GBIC is definitely an attractive, because of its flexibility, the typical network equipment. The different optical technology deployed inside the network, IT personnel can get gbic module needs a specific kind of link. The GBIC standard drive flexibility to cut back costs and provide greater flexibility for IT administrators. The GBIC standard non-proprietary and SFF-8053i files defined by the SFF Committee.

 Remarks:

 When install the GBIC modules, please be aware on the alignment groove at the side of the transceiver, and make sure it fit for that Ethernet interface slot and try the insertion, sometimes you may have to transform it 180 degrees to fit for the interface.

 Although GBIC fiber optic transceiver modules are plug and play, we recommend you disconnect all the fiber optic patch cords connected to it before you install or eliminate it.

 fiber-mart.com is leading in fiber optic modules. We are an expert manufacturer and supplier of fiber optic products. Supplies a comprehensive range of fiber optic products, for example fiber optic couplers you’ll find in our store. Buy with full confidence.

Network main transmission capacity continues to expand and improve the rate of optical fiber communication makes the modern information network as the main means of transmission. Dramatic increase in the optical communication network, optical transceiver modules lead to a diversity of needs continuous development technology to meet such application requirements.

Optical module how much you know about it, do not worry, follow my steps slowly to understand. Today, we have to first understand which two optical modules. Cisco SFP vs Cisco XFP .

fiber-mart.com SFP (small form-factor pluggable) is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. The form factor and electrical interface are specified by a multi-source agreement (MSA). It interfaces a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic or copper networking cable. It is a popular industry format jointly developed and supported by many network component vendors. SFP transceivers are designed to support SONET, Gigabit Ethernet, Fiber Channel, and other communications standards.

fiber-mart.com supply various kinds of SFP module 100% compatible with Cisco, HP, Juniper, Net gear, DELL, CWDM SFP, DWDM SFP, BIDI SFP and 10G SFP.As a 3rd party OEM manufacturer, our cisco sfp transceivers are delivered to worldwide from our factory directly. All of our Cisco SFP module are tested in-house prior to shipment to guarantee that they will arrive in perfect physical and working condition.

fiber-mart.com XFP (10 Gigabit Small Form Factor Pluggable) is a hot-swappable optical transceiver is independent of the communication protocol, usually transmitted light wavelength is 850nm, 1310nm or 1550nm for 10G bps SONET / SDH, Fiber Channel, gigabit Ethernet, 10 gigabit Ethernet and other applications, including DWDM link. XFP contains similar SFF-8472 digital diagnostic modules, but extended to provide a powerful diagnostic tool. XFP modules use an LC fiber connector type to achieve high density.

fiber-mart.com XFP transceiver is a high performance, cost effective modules for serial optical data communications applications specified for signal rates of 10.30 Gb/s to 11.3 Gb/s. It is fully compliant to XFP MSA Rev 4.5. The XFP modules are designed for single mode fiber and operates at a nominal wavelength of 850/1310/1550 nm including DWDM XFP, CWDM XFP,BiDi XFP,10G XFP and compatible Cisco XFP, Juniper XFP, Brocade XFP. We guarantee the XFP transceivers to work in your system and all of our XFP comes with a lifetime advance replacement warranty.

SFP and XFP difference:

The 1, SFP and XFP are 10G fiber module, can communicate with each other and with other types of 10G module;

The 2, SFP is smaller than XFP module Dimensions;

The 3, Smaller SFP signal modulation function, serial / deserializer, MAC, clock and data recovery (CDR), as well as electronic dispersion compensation (EDC) function from the module to the motherboard on the card