40G Ethernet Fiber Optic Transceivers Introduction
The development of a brand new Ethernet system that operates up to 10 Gb/s began with a Higher Speed Study Group "Call For Interest" meeting in July 2006. In response, an IEEE task force was formed to develop a 100 Gb/s Ethernet system in the 802.3ba supplement. This effort was then expanded to include 40 Gb/s Ethernet, and the combined 40 and 100 Gb/s 802.3ba supplement was completed and published in 2010. The 40 and 100 Gb/s specifications were adopted into the standard as Clauses 80 through 89.
There's two 40 Gigabit fiber optic physical medium dependent (PMD) specifications in the standard, which offer 40 Gb/s Ethernet over multimode fiber optic (MMF) cable and single-mode fiber optic (SMF) cable. The 40GBASE-SR4 short reach fiber optic system sends four lanes of PCS data over four pairs of multimode cables, for a total of eight fiber strands. The 40GBASE-LR4 long-reach system sends four lanes of PCS data over four wavelengths of light, carried over a single pair of fiber optic cables. And today,we introduce Fiberstore two kinds of 40 Gigabit fiber optic transceivers.
The first 40 Gb/s transceivers were depending on the C form-factor pluggable module(40Gbit/s CFP Transceiver), that is a large module able to handle faster than 24 watts of power dissipation. First-generation transceivers with multiple chips and greater power requirements were according to this module. The CFP module is specified by a multiagreement.
Figure 1 shows a CFP module, which can be used to supply either a 40GBASE-SR4 or a 40GBASE-LR4 transceiver. The module shown in this figure is a 40GBASE-LR4 transceiver, which provides two SC fiber optic connectors for connection to a pair of single-mode fibers.
Figure 1. 40GBASE-LR4 CFP Optical Transceiver Module
The second is named 40-Gigabit QSFP+ transceiver module,that is a hot-swappable, parallel fiber-optical module with four independent optical transmit and receive channels. These channels can terminate in another 40-Gigabit QSFP+ transceiver, or the channels could be broken out to four separate 10-Gigabit SFP+ transceivers. The QSFP+ transceiver module connects the electrical circuitry of the system with either a copper or an optical external network. (See Figure 2 for a view of the optical QSFP+ transceiver.) The transceiver is used primarily in short reach applications in data center equipment, routers, and switches where it offers higher density than SFP+ modules.
Figure 2 shows a single-mode fiber optic cable terminated in an LC optical plug connector. Also shown is a 40G QSFP+ transceiver module with LC optical sockets.
Figure 2. 40GBASE-LR4 QSFP+ Transceiver Module
The QSFP+ 40GBASE-LR4 transceiver module is the newest technology for OEM next-generation systems where industry leaders are eager to extend reach, increase speed and lower their customers'overall power consumption and simply large data center and enterprise applications. Moving to 40GbE QSFP+ also significantly improves port density.
The 40GbE QSFP+ module extends a pre-existing 40G family of products provided by Fiberstore, such as the 40GBASE-LR4 module from the larger CFP form factor which is seeing initial deployments in customer systems now and has been recently announced as production released. 40GBASE-LR4 technology offers OEMs a cheaper cost, longer reach substitute for traditional 40G Sonet/SDH client interfaces and makes 40G deployments much more economically viable in high-speed switches and edge routers.
Fiberstore, a world leader in high-speed optical communications technology,which provides all kinds of Internet networking connection solution. Except to provides fiber optic transceivers and DAC cables, fiberstore.com also provides customized solutions for all needs and specifications.