The 10G SFP+ modules allow a wide variety of 10 Gigabit Ethernet connectivity options for enterprise, data center, and service provider transport applications. A single piece of hardware can accommodate a wide variety of cable and connection types, simply by substituting transceiver for the connector being used. Unfortunately, this also means that finding the right SFP+ transceiver for your application can sometimes be confusing and difficult, because many connection types exist: SFP-10G-SR, SFP-10G-LR, SFP-10G-LRM, SFP-10G-ER, SFP-10G-ZR, SFP-10G-T-S, CVR-XENPAK-SFP10G and CVR-X2-SFP10G. This article mainly talks about the difference between Cisco SFP-10G-SR and Cisco SFP-10G-LR.

The SFP+ is the enhanced small form-factor pluggable. It is also called SFP 10G to avoid confusion with the 1G version (SFP). It has the same shape as the SFP, but SFP+ can support data rates up to 10 Gbit/s. Specifically, it can support 8 Gbit/s on Fibre Channel and 10 Gbit/s on Gigabit Ethernet and optical transport network standard OTU2. As usual, it is a popular industry format because of the smallest 10G form factor for greatest density per chassis. The buyers for SFP+ are typically storage vendors and private data center operators. Other customers with large data center requirements may make the same decision and move forward with the SFP+.

Cisco SFP-10G-SR is designed for use with Cisco networking equipment. This transceiver module is the multimode 10G fiber optical transceiver with duplex LC connector, and it can support a link length of up to 26m on standard FDDI MMF and 300m link length when using 2000MHz KM MMF (OM3). In addition, it supports data transfer rates up to 10 Gbps with 850nm wavelength signaling. The hot-swappable supported feature has no need to power off the device when plugging into an Ethernet SFP+ port of a Cisco switch. It is manufactured to meet or exceed the specifications of the original Cisco unit, and to comply with MSA standards. It is electrical interface-compliant with SFF-8431 specification, and supports DDM.

The Cisco SFP-10G-LR is a 10GBase SFP+ Optical Transceiver with duplex LC connector. The 10GBase SFP+ optical transceiver supports distances up to 10 kilometers on standard single-mode fiber optic cables. It is also designed to operate with Cisco networking equipment. It also meets or exceeds the original specifications and complies with MSA standards. This 10GBase-LR transceiver is fully hot-pluggable, so you can install it without shutting down the network or rebooting your device. Furthermore, it supports data transfer rates up to 10 Gbps with 1310nm wavelength signaling. Its metallic housing allows low EMI. It also supports DDM, so you can monitor optical output power, optical input power, temperature, laser bias current and transceiver supply voltage. It is electrical interface-compliant with SFF-8431 specification, and supports up to 11.1 Gbps bi-directional communication.

SR stands for short reach, and LR stands for long reach. SR transceivers are almost always multimode, and optimized for high speeds over relatively short distances, while LR transceivers are designed for long-range communications, such as wiring buildings together on a large campus.

Table 1: Cisco SFP-10G-SR

Table 2: Cisco SFP-10G-LR

From these two tables, we can see the main differences are wavelenghth and cable type. SFP-10G-LR can reach up to 10km over single-mode fiber, which is designed for storage, IP network and LAN. At the same time, SFP-10G-SR is the original multimode optics specification, and it is still by far the most commonly used. As it uses a single, low cost solid state laser assembly, it is also the least expensive fiber optical modules available for a 10GbE platform. All in all, both SFP-10G-LR and SFP-10G-SR can ensure 10G transmission.

Except SFP-10G-LR and SFP-10G-SR, there are other similar Cisco compatible transceivers, including the: SFP-10G-LRM, SFP-10G-ER and SFP-10G-ZR. Each of these models is an SFP+ 10 Gigabit transceiver with digital optical monitoring capabilities. The table below outlines some of the key differences between these popular transceivers:

FS.COM provide compact, high quality and reliable interfaces for 10G Ethernet connections. I believe our 10G SFP+ transceiver is ideal for use in data centers, enterprise and service provider applications. Besides, we offer all brands and form factors of optical transceivers for all your networking needs. So you will find the most reliable, compatible and affordable way to expand your network. To learn more about FS.COM, or for a deeper consultation on your specific transceiver needs, just contact us directly or visit www.fs.com!

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When Cloud computing and web services continue to push the demand for bandwidth, new transmission medium must be developed to meet the requirements of end users. A new multimode optical fiber called OM5 fiber will allow to use the SWDM technology to transmit multiple wavelengths on one fiber. In this way, end users can obtain greater bandwidth and higher speeds. To help you use OM5 fiber to its greatest advantage, this article will introduce the basis of multimode fiber and OM5 fiber and highlight the key benefits of OM5 fiber. Consequently, you can find that OM5 is a new successful option for data centers.

Multimode fiber is a type of optical fiber that is designed to carry multiple light rays or modes simultaneously. It is mostly used for transmission over short distances in result of modal dispersion. Typically, the link length of MMF fiber cable is up to 600 meters (2000 feet). Besides, multimode fiber cable has a fairly large core diameter that enables multiple light modes to be transmitted. The core’s graded index profile is designed to slow down modes that have a shorter distance to transmit, so all modes arrive at the end of the fiber as close in time as possible. As a result, this process minimizes modal dispersion and maximizes bandwidth. In addition, multimode fiber optic patch cables have a large numerical aperture, the maximum angle at which a fiber can accept the light that will be transmitted through it. This allows them to work with relatively low-cost optical components and light sources such as LEDs and VCSELs.

OM5 is a wideband multimode fiber, which is a recently released fiber medium that is now recognized within TIA and IEC standards. OM5 fiber is a 50µm laser-optimized multimode fiber with extended bandwidth. It is designed to support SWDM applications in range of wavelengths from 850nm to 953nm for transmitting 40Gb/s and 100Gb/s, optimizing for reducing fiber counts for higher speeds. Specifically, OM5 fiber can reduce parallel fiber count by at least a factor of four to allow continued use of just two fibers (rather than eight) for transmitting 40 Gb/s(up to 400m) and 100 Gb/s(up to 150m).

To welcome the selection of the new fiber, the following is the key benefits of OM5 fiber:

• OM5 offers a wider range of wavelengths.

It supports wavelength from 850nm to 953nm for transmitting 40Gb/s and 100Gb/s, which is ready for next-generation wideband networks.

• OM5 will reduce costs.

OM5 fiber allows to use the SWDM technology to transmit multiple wavelengths on one fiber, increasing the bandwidth of a single fiber by a factor of at least four. Therefore, OM5 minimizes the number of fibers required to achieve greater speeds, and preserves the economic benefit of using multimode optical fiber.

• OM5 is required for higher speeds.

Through the SWDM technology, OM5 is provided the capability to increase transmission speeds.

• OM5 is ready for the future’s applications.

OM5 is backwards compatible to OM4 and OM3, and it can apply to future applications such as 40GBASE-SR, 100GBASE-SR, 200GBASE-SR, and 400GBASE-SR4, but also 128GFC and 256GFC.

For the increasing needs of today’s data centers, FS.COM meet the latest advances in technology, along with the demands of commercial and industrial applications. Currently, FS.COM introduces the OM5 multimode wideband fiber optic patch cables, these new fibers allow for continued economic benefit in deploying short reach optics using multimode optical fiber. What’s more, FS.COM offers the full performance range and has better optical and geometry specifications, which can allow for reduced connection / insertion loss and greater systems margin, which in turn enables longer reach, additional connections, and greater systems reliability. I believe that FS.COM is you best choice to select the OM5 fiber. Learn more about FS.COM OM5 fiber solutions, please visit www.fs.com.

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We know that fiber can carry more data over long distances than any other physical medium. That makes fiber a very precious material. And how to make the most use of your fiber plant becomes a question. So there comes Wavelength Division Multiplexing (WDM).

Why Should We Deploy WDM ?

WDM can multiply your fiber capacity by creating virtual fibers. The foundation of WDM lies in the ability to send different data types over fiber networks in the form of light. By allowing different light channels, each with a unique wavelength, to be sent simultaneously over an optical fiber network, a single virtual fiber network is created. Instead of using multiple fibers for each and every service, a single fiber can be shared for several services. In this way WDM increases the bandwidth and maximizes the usefulness of fiber. Since fiber rental or purchase accounts for a large share of networking costs, substantial costs can be saved through the application of WDM. Next I will introduce to you the basic four elements in the form of a WDM system.

The Core Technology of WDM System

Generally speaking, a WDM system consists of four elements, that are transceiver, multiplexer, patch cord and dark fiber. The following text will explain them to you respectively.

• Fiber Optic Transceivers. Optical transceivers are wavelength-specific lasers that convert data signals from SAN or WAN to optical signals that can be transmitted into the fiber. Each data stream is converted into a signal with a light wavelength that is an unique color. Due to the physical properties of light, channels cannot interfere with each other. Therefore, all WDM wavelengths are independent. Creating virtual fiber channels in this way can reduce the number of fibers required. It also allows new channels to be connected as needed, without disrupting the existing traffic services.
• Optical Multiplexers. The WDM multiplexer, sometimes referred to as the Mux, is the key to optimizing, or maximizing, the use of the fiber. The multiplexer is at the heart of the operation, gathering all the data streams together to be transported simultaneously over a single fiber. At the other end of the fiber the streams are demultiplexed and separated into different channels again.
• Patch cord. The transceiver transmits the high-speed data protocols on narrow band wavelengths while the multiplexer is at the heart of the operation. The patch cable is the glue that joins these two key elements together. LC fiber patch cables are popular, which connect the output of the transceiver to the input on the multiplexer.
• Dark fiber. A requisite for any WDM solution is access to a dark fiber network. The most common way of transporting optical traffic over an architecture is by using a fiber pair. One of the fibers is used for transmitting the data and the other is used for receiving the data. This allows the maximum amount of traffic to be transported. At times only a single fiber is available. Because different light colors travel on different wavelengths, a WDM system can be built regardless. One wavelength is used to send data and a second one to receive it.

Conclusion

WDM has revolutionized the cost of network transport. Thanks to WDM, fiber networks can carry multiple Terabits of data per second over thousands of kilometers with a low cost that is unimaginable less than a decade ago. At FS, we offer a comprehensive portfolio of WDM transmission modules to support the network applications of enterprise and service provider customers. For more details, please visit www.fs.com.

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