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QSFP+ Optics for High-Density 40 GE Connectivity

With the development of the SFF-8436 Multi Source Agreement, many vendor are now offering a variety of IEEE- and MSA-compliant Quad Small Form-Factor Pluggable Plus (QSFP+) devices for fiber networks. And there are basic three 40G QSFP+ optics for this standard: 40G LR4 QSFP+ transceiver, 40G SR4 QSFP+ transceiver and 40G LR4 parallel single mode (PSM) transceiver. This article will take a close look at these 40G QSFP+ optics for high-density 40 GE connectivity.

40G LR4 QSFP+ Transceiver

Conforming to the 802.3ba (40GBASE-LR4) standard, the 40G LR4 QSFP+ transceiver together with the LC connector can support an optical link length up to 10 kilometers over single mode fiber. For example, the following Juniper JNP-QSFP-40G-LR4 compatible 40GBASE-LR4 QSFP+ transceiver offers 4 independent transmit and receive channels, supporting link distance of 10 km over single mode fiber. In the process of transmitting, this kind of transceiver has to introduce MUX/DEMUX to multiplex/de-multiplex optical signals.


The working principle of this kind of QSFP+ transceiver is : in the transmit side, four 10 Gbp/s serial data streams are passed to laser drivers. The laser drivers control directly modulated lasers (DMLs) with wavelengths. the output of the four DMLs are optically multiplexed to a single-mode fiber through an industry-standard LC connector. In the receive side, the four 10 Gbp/s optical data streams are optically de-multiplexed by the integrated optical demultiplexer; then, each data steam is recovered by a PIN photodetector/transimpedance amplifier and passed to an output driver.

40G SR4 QSFP+ Transceiver

The 40G SR4 QSFP+ transceiver, conforming to the 802.3ba (40GBASE-SR4) standard, provides a 40G optical connection using MPO/MTP fiber ribbon connectors. Unlike the 40G LR4 QSFP+ transceiver, this kind of transceiver are used together with multi-mode fiber, supporting with a link length up to 100 meters on OM3 cable and 150 meters on OM4 cable.

The operating principle of the 40G SR4 QSFP+ Transceiver is : the transmitter convertsparallel electrical input signals into parallel optical signals through the use of a laser array. Then the parallel optical signals are transmitted parallelly through the multi-mode fiber ribbon. Reversely, the receiver converts parallel optical input signals via a photo detector array into parallel electrical output signals.

40G LR4 Parallel Single Mode (PSM) Transceiver

40G PSM transceivers are used to provide support for up to four 10Gb Ethernet connections on a QSFP+ port over single mode fiber. These transceivers support distance of up to 10 kilometers over single mode fiber using an 8 parallel fiber MPO interface. Each fiber pair can be broken out to a 10Gb Ethernet connection, compatible with up to four 10GBASE-LR interfaces. The MPO to 4 x LC single mode fiber patch cord can be used to breakout the 4 fiber pair of the MPO parallel connector to 4 separate fiber pairs.


To sum up, 40G SR4 QSFP+ transceivers are suitable for short-distance transmissions. So they are often used in data centers to interconnect two Ethernet switches with 12 lane ribbon OM3/OM4 cables. while 40G LR4 QSFP+ transceivers and 40G LR4 PSM transceivers are often used in long-distance transmission applications. Fiberstore offers a wide range of 40G QSFP+ transceivers, like 40GBASE-SR4, 40GBASE-LR4, 40GBASE-CR4 QSFP+ transceivers, etc. Besides, we also provide 40G direct attach cables, such as Juniper QFX-QSFP-DAC-1M, Cisco QSFP-4X10G-AOC3M and so on.

Publicerat klockan 08:27, den 1 mars 2016
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High Speed Ethernet Cabling

There is a variety of types of cables and transceiver modules available for making Ethernet connections at speeds of 1Gigabit per second and above. This article will introduce the widely used optical transceivers and cables for 1-Gigabit, 10-Gigabit and 40-Gigabit connections.

1-Gigabit Connections
  • Transceivers
    Optical fiber connections are constructed with a combination of a transceiver (sometimes called a GBIC – for GigaBit Interface Converter). The transceiver accepts digital signals from the Ethernet device (switch or adapter card) and converts them to optical signals for transmission over the fiber. Although a number of different form factors for this GBIC have been defined by standards bodies, the most common is the SFP (Small Form Factor Pluggable Transceiver). The term GBIC initially was used for a specific form factor, but with the widespread adoption of the smaller SFP standard form factor, the term GBIC has fallen into the vernacular as a general term for an optical transceiver.
  • Cables
    The most commonly used cable for 1Gbps Ethernet is the Category 5 (Cat5) cable with an RJ45 connector on either end. This cable can handle connections of up to about 100 M in length. For longer connections an optical fiber cable can be used.
10-Gigabit Connections

For 10-Gigabit Ethernet cabling the fiber options are very similar. The transceivers are somewhat different, as is some nomenclature. New possibilities have evolved for copper connections.

  • Transceivers
    Standards bodies initially offered several options for the 10-Gigabit transceiver. The one that ultimately evolved as most popular in commercial data center usage was the XFP transceiver. XFP stands for 10–Gigabit Form Factor Pluggable. In recent years an extension of the SFP transceiver was standardized for use with 10 Gigabit Ethernet and named SFP+. SFP+ has the same mechanical characteristics as the the SFP transceiver – it just is capable of supporting the higher speed (some, but not all, SFP+ transceivers can actually operate at either 1Gbps or 10Gbps). The advantage of SFP+ was that it was smaller than the XFP form factor allowing for much more dense packaging of ports on switches.
  • Fiber Cables
    10-Gigabit Ethernet fiber connections use the same optical fiber types as 1-Gigabit Ethernet. The range is less due to the higher speed and the names are similar:
    Short Range: SR -for connections of up to 300 M in length
    Long Range: LR –for connections of up to 2,000 M (2 KM) in length.
    A new option is also available, though rather rarely used:
    Extended Range: ER – for connections of up to 10,000 M (10 KM) in length.
40-Gigabit Connections
  • Transceivers
    40 Gigabit optical transceivers mainly include CFP transceiver and QSFP transceiver. The most common types of QSFP/QSFP+ optical transceivers are QSFP-40G-PLR4, QSFP-40G-CSR4, 40GBASE-PLRL4, QSFP-40G-LR4, and QSFP-40G-SR4. For example, Juniper JNP-QSFP-40G-LR4 compatible 40GBASE-LR4 QSFP + transceiver from Fiberstore provides 4 CWDM lanes in 1310nm and achieves a transmission distance of 10km over single mode fibers.
  • Cable Assemblies
    Cables used in 40 Gigabit Ethernet mainly include passive and active direct attach copper cables and active optical cable (AOC). The QSFP+ passive or active direct attach copper cables are designed with twinax copper cable and terminated with QSFP+ connectors. For instance, Cisco QSFP-4SFP10G-CU1M compatible QSFP+ to 4SFP+ passive copper cable is suitable for very short distances and offer a very cost-effective way to establish a 40-gigabit link between QSFP port and SFP+ port of Cisco switches within racks and across adjacent racks. The main difference between passive QSFP+ DAC and active QSFP+ DAC is that the passive one is without the active component. AOC is used for short-range multi-lane data communication and interconnect applications. It uses electrical-to-optical conversion on the cable ends to improve speed and distance performance of the cable without sacrificing compatibility with standard electrical interfaces.

As the main fiber optical manufacturer and supplier in China, Fiberstore offers a full range of optical transceivers, such as SFP+ transceiver, X2 transceiver, XENPAK transceiver, XFP transceiver, SFP transceiver, GBIC transceiver, CWDM/DWDM transceiver, 40G QSFP+ & CFP, 3G-SDI video SFP, WDM Bi-Directional transceiver and PON transceiver. All our fiber transceivers are 100% compatible with major brands like Cisco, HP, Juniper, Nortel, Force10, D-link, 3Com.

Publicerat klockan 02:36, den 18 januari 2016
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