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Long Wavelength VCSEL: The Technology for 10-Gigabit Enterprise Networks

機譯：長波長VCSEL：10千兆企業網絡的技術

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The rapid growth of Internet and high demand for more data storage has made vertical cavity surface emitting laser (VCSEL) the technology of choice in enterprise networks, including local area networks (LANs) and storage area networks (SANs), for its low cost, high performance and high reliability. The VCSEL is made of GaAs/AlGaAs materials and operates at a wavelength around 850 nm. It is the key transmission component in an optical transceiver module for Gigabit Ethernet and Fiber Channel from 1 to 4 Gbps on multimode fibers up to 500 m, depending on the operation data rate and the fiber bandwidth. Today, up to 10 million units of 850nm VCSELs are being shipped annually for this market. As the Gigabit Ethernet migrates from enterprise network backbones to desktops, the urgency becomes imminent to upgrade the backbones to 10 Gigabit Ethernet. Majority of the installed multimode fibers have a specified bandwidth of 500 MHz.km or less, and a large percentage of which are the FDDI grade fibers specified at 160 MHz.km. The 850 nm VCSEL will support from 26 m to 82 m on those fibers according to the IEEE802.3ae standard for the 10-Gigabit Ethernet. However, the market demands for a low cost 10-Gigabit Ethernet solution to transmitting data on the installed multimode fibers for at least 300 m. Two approaches have been proposed to addressing this legacy 300-m requirement. One is a four-lane CWDM transceiver defined by the IEEE 802.3ae standard, 10GBASE-LX4. The wavelengths of four laser transmitters, each operating at 3.125Gbps, are specified to be within LO (1269.0-1282.4 nm), L1 (1293.5 - 1306.9 nm), L2 (1318.0 - 1331.4 nm) and L3 (1342.5 -1355.9) wavelength grids, respectively. The other is a serial 10 Gbps solution with electronic dispersion compensation (EDC), 10GBASE-LRM, which is under study by the IEEE 802.3aq standard working group. The current schedule calls for completing the 10GBASE-LRM standard by early 2006.
機譯：互聯網的快速發展和對更多數據存儲的高需求使垂直腔表面發射激光器（VCSEL）成為企業網絡（包括局域網（LAN）和存儲區域網絡（SAN））的首選技術，其價格低廉，高性能和高可靠性。 VCSEL由GaAs / AlGaAs材料制成，并在850 nm左右的波長下工作。它是光收發器模塊中的關鍵傳輸組件，取決于工作數據速率和光纖帶寬，該收發器模塊可在長達500 m的多模光纖上實現1到4 Gbps的千兆位以太網和光纖通道。如今，每年為此市場出貨的1000萬個850nm VCSEL高達1000萬個。隨著千兆以太網從企業網絡主干遷移到臺式機，迫切需要將主干升級到10吉比特以太網。大多數已安裝的多模光纖的指定帶寬為500 MHz.km或更小，其中很大一部分是FDDI級光纖，指定為160MHz.km。 850 nm VCSEL將根據10 Gb以太網的IEEE802.3ae標準在這些光纖上支持26 m至82 m。但是，市場需要低成本的10 Gb以太網解決方案，以在已安裝的多模光纖上傳輸數據至少300 m。已經提出了兩種方法來解決這種傳統的300米要求。一種是由IEEE 802.3ae標準10GBASE-LX4定義的四通道CWDM收發器。四個工作在3.125Gbps的激光發射器的波長規定在LO（1269.0-1282.4 nm），L1（1293.5-1306.9 nm），L2（1318.0-1331.4 nm）和L3（1342.5 -1355.9）波長網格內， 分別。另一個是具有電子色散補償（EDC）的串行10 Gbps解決方案10GBASE-LRM，該方案正在由IEEE 802.3aq標準工作組進行研究。當前的時間表要求在2006年初之前完成10GBASE-LRM標準。

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